iOS设备中的Keychain是一个安全的存储容器，可以用来为不同应用保存敏感信息比如用户名，密码，网络密码，认证令牌。苹果自己用keychain来保存Wi-Fi网络密码，VPN凭证等等。它是一个sqlite数据库，位于/private/var/Keychains/keychain-2.db，其保存的所有数据都是加密过的。模拟器下keychain文件路径：~/Library/Application Support/iPhone Simulator/4.3/Library/Keychains
keychain里保存的信息不会因App被删除而丢失，在用户重新安装App后依然有效，数据还在。
关于备份，只会备份数据，到那时不会备份设备的密钥，换句话说，即使拿到数据，也没有办法解密里面的内容。
比较复杂的数据，使用苹果官方发布的KeychainItemWrapper或者SFHFKeychainUtils会很方便。如果是比较简单的，就不用苹果提供的类了，自己写个简单的类来实现就好了。
两种方法都需要在”Build Phases“中导入库"Security.framework"
一、自己封装的类
（1）实现代码（思路是将数据封装进NSDictionary，通过NSKeyedArchiver归档后保存）
a）MyKeychain.h
// // MyKeychainh // UUIDdemo // // Created by 555chy on 6/10/ // Copyright © 2016 555chy All rights reserved // #import <Foundation/Foundationh> #import <Security/Securityh> @interface MyKeychain : NSObject + (BOOL)save:(NSString*)service data:(id)data; + (id)load:(NSString*)service; + (void)delete:(NSString*)service; @end b）MyKeychainm // // MyKeychainm // UUIDdemo // // Created by 555chy on 6/10/ // Copyright © 2016 555chy All rights reserved // #import "MyKeychainh" @implementation MyKeychain + (NSMutableDictionary*) getKeychainQuery: (NSString*)service { return [NSMutableDictionary dictionaryWithObjectsAndKeys: (id)kSecClassGenericPassword, (id)kSecClass, service, (id)kSecAttrService, service, (id)kSecAttrAccount, (id)kSecAttrAccessibleAfterFirstUnlock, (id)kSecAttrAccessible, nil nil]; } + (BOOL) save:(NSString*)service data:(id)data { NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; SecItemDelete((CFDictionaryRef)keychainQuery); [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData]; return SecItemAdd((CFDictionaryRef)keychainQuery, NULL) == noErr; } + (id) load:(NSString*)service { id ret = NULL; NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData]; [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit]; NSData *keyData = NULL; if(SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef*)(void*)&keyData) == noErr) { @try { ret = [NSKeyedUnarchiver unarchiveObjectWithData:keyData]; } @catch (NSException *exception) { NSLog(@"Unarchive of %@ failed: %@", service, exception); } @finally { } } return ret; } + (void) delete:(NSString*)service { NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; SecItemDelete((CFDictionaryRef)keychainQuery); } @end
c）ViewController.m
// // ViewControllerm // UUIDdemo // // Created by 555chy on 6/10/ // Copyright © 2016 555chy All rights reserved // #import "ViewControllerh" #import "MyKeychainh" @interface ViewController () @end @implementation ViewController NSString *KEY_PACKAGE_NAME = @"comchyuuiddemouuid"; NSString *KEY_UUID = @"uuid"; -(void) saveIdfv { NSString *idfv = [[[UIDevice currentDevice] identifierForVendor] UUIDString]; NSLog(@"get from UIDevice, idfv is %@", idfv); NSMutableDictionary *dataDict = [NSMutableDictionary dictionary]; [dataDict setObject:idfv forKey:KEY_UUID]; BOOL ret = [MyKeychain save:KEY_PACKAGE_NAME data:dataDict]; NSLog(@"save %@ %@", idfv, ret"); } -(void) reloadIdfv { NSMutableDictionary *loadData = [MyKeychain load:KEY_PACKAGE_NAME]; NSString *loadIdfv = [loadData objectForKey:KEY_UUID]; if(loadIdfv) { NSLog(@"load idfv is %@", loadIdfv); } else { NSLog(@"load idfv, but it not exist"); } } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib [self reloadIdfv]; [self saveIdfv]; [self reloadIdfv]; [MyKeychain delete:KEY_PACKAGE_NAME]; NSLog(@"delete idfv from keychain"); [self reloadIdfv]; [self saveIdfv]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated } @end
（2）运行结果
第一次运行
第二次运行
在模拟器上每次运行实际上都是卸载前一个APP，然后再安装新的APP。而保存在keychain中的IDFV标识符依然还在。
（3）基本语法
SecItemAdd 增
SecItemUpdate 改
SecItemDelete 删
SecItemCopyMatching 查
（4）SecItem.h（变量的介绍基本都在头文件中了，看下头文件中的注释就能明白其中的含义）
/* * Copyright (c) 2006-2014 Apple Inc All Rights Reserved * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 0 (the 'License') You may not use this file except in * compliance with the License Please obtain a copy of the License at * http://wwwopensourceapplecom/apsl/ and read it before using this * file * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT * Please see the License for the specific language governing rights and * limitations under the License * * @APPLE_LICENSE_HEADER_END@ */ /*! @header SecItem SecItem defines CoreFoundation-based constants and functions for access to Security items (certificates, keys, identities, and passwords) */ #ifndef _SECURITY_SECITEM_H_ #define _SECURITY_SECITEM_H_ #include <Security/SecBaseh> #include <CoreFoundation/CFArrayh> #include <CoreFoundation/CFDictionaryh> __BEGIN_DECLS CF_ASSUME_NONNULL_BEGIN CF_IMPLICIT_BRIDGING_ENABLED /*! @enum Class Key Constant @discussion Predefined key constant used to get or set item class values in a dictionary Its value is one of the constants defined in the Value Constants for kSecClass @constant kSecClass Specifies a dictionary key whose value is the item's class code You use this key to get or set a value of type CFTypeRef that contains the item class code */ extern const CFStringRef kSecClass __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum Class Value Constants @discussion Predefined item class constants used to get or set values in a dictionary The kSecClass constant is the key and its value is one of the constants defined here @constant kSecClassGenericPassword Specifies generic password items @constant kSecClassInternetPassword Specifies Internet password items @constant kSecClassCertificate Specifies certificate items @constant kSecClassKey Specifies key items @constant kSecClassIdentity Specifies identity items */ extern const CFStringRef kSecClassGenericPassword __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecClassInternetPassword __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecClassCertificate __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecClassKey __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecClassIdentity __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); /*! @enum Attribute Key Constants @discussion Predefined item attribute keys used to get or set values in a dictionary Not all attributes apply to each item class The table below lists the currently defined attributes for each item class: kSecClassGenericPassword item attributes: kSecAttrAccessible kSecAttrAccessControl kSecAttrAccessGroup kSecAttrCreationDate kSecAttrModificationDate kSecAttrDescription kSecAttrComment kSecAttrCreator kSecAttrType kSecAttrLabel kSecAttrIsInvisible kSecAttrIsNegative kSecAttrAccount kSecAttrService kSecAttrGeneric kSecAttrSynchronizable kSecClassInternetPassword item attributes: kSecAttrAccessible kSecAttrAccessControl kSecAttrAccessGroup kSecAttrCreationDate kSecAttrModificationDate kSecAttrDescription kSecAttrComment kSecAttrCreator kSecAttrType kSecAttrLabel kSecAttrIsInvisible kSecAttrIsNegative kSecAttrAccount kSecAttrSecurityDomain kSecAttrServer kSecAttrProtocol kSecAttrAuthenticationType kSecAttrPort kSecAttrPath kSecAttrSynchronizable kSecClassCertificate item attributes: kSecAttrAccessible kSecAttrAccessControl kSecAttrAccessGroup kSecAttrCertificateType kSecAttrCertificateEncoding kSecAttrLabel kSecAttrSubject kSecAttrIssuer kSecAttrSerialNumber kSecAttrSubjectKeyID kSecAttrPublicKeyHash kSecAttrSynchronizable kSecClassKey item attributes: kSecAttrAccessible kSecAttrAccessControl kSecAttrAccessGroup kSecAttrKeyClass kSecAttrLabel kSecAttrApplicationLabel kSecAttrIsPermanent kSecAttrApplicationTag kSecAttrKeyType kSecAttrKeySizeInBits kSecAttrEffectiveKeySize kSecAttrCanEncrypt kSecAttrCanDecrypt kSecAttrCanDerive kSecAttrCanSign kSecAttrCanVerify kSecAttrCanWrap kSecAttrCanUnwrap kSecAttrSynchronizable kSecClassIdentity item attributes: Since an identity is the combination of a private key and a certificate, this class shares attributes of both kSecClassKey and kSecClassCertificate @constant kSecAttrAccessible Specifies a dictionary key whose value indicates when your application needs access to an item's data You should choose the most restrictive option that meets your application's needs to allow the system to protect that item in the best way possible See the "kSecAttrAccessible Value Constants" section for a list of values which can be specified IMPORTANT: This attribute is currently not supported for OS X keychain items, unless the kSecAttrSynchronizable attribute is also present If both attributes are specified on either OS X or iOS, the value for the kSecAttrAccessible key may only be one whose name does not end with "ThisDeviceOnly", as those cannot sync to another device @constant kSecAttrAccessControl Specifies a dictionary key whose value is SecAccessControl instance which contains access control conditions for item @constant kSecAttrAccessGroup Specifies a dictionary key whose value is a CFStringRef indicating which access group a item is in The access groups that a particular application has membership in are determined by two entitlements for that application The application-identifier entitlement contains the application's single access group, unless there is a keychain-access-groups entitlement present The latter has as its value a list of access groups; the first item in this list is the default access group Unless a specific access group is provided as the value of kSecAttrAccessGroup when SecItemAdd is called, new items are created in the application's default access group Specifying this attribute in SecItemCopyMatching, SecItemUpdate, or SecItemDelete calls limits the search to the specified access group (of which the calling application must be a member to obtain matching results) To share keychain items between multiple applications, each application must have a common group listed in its keychain-access-groups entitlement, and each must specify this shared access group name as the value for the kSecAttrAccessGroup key in the dictionary passed to SecItem functions @constant kSecAttrSynchronizable Specifies a dictionary key whose value is a CFBooleanRef indicating whether the item in question can be synchronized To add a new item which can be synced to other devices, or to obtain synchronizable results from a query, supply this key with a value of kCFBooleanTrue If the key is not supplied, or has a value of kCFBooleanFalse, then no synchronizable items will be added or returned A predefined value, kSecAttrSynchronizableAny, may be provided instead of kCFBooleanTrue if both synchronizable and non-synchronizable results are desired IMPORTANT: Specifying the kSecAttrSynchronizable key has several caveats: - Updating or deleting items using the kSecAttrSynchronizable key will affect all copies of the item, not just the one on your local device Be sure that it makes sense to use the same password on all devices before deciding to make a password synchronizable - Only password items can currently be synchronized Keychain syncing is not supported for certificates or cryptographic keys - Items stored or obtained using the kSecAttrSynchronizable key cannot specify SecAccessRef-based access control with kSecAttrAccess If a password is intended to be shared between multiple applications, the kSecAttrAccessGroup key must be specified, and each application using this password must have a 'keychain-access-groups' entitlement with the specified access group value - Items stored or obtained using the kSecAttrSynchronizable key may not also specify a kSecAttrAccessible value which is incompatible with syncing (namely, those whose names end with "ThisDeviceOnly") - Items stored or obtained using the kSecAttrSynchronizable key cannot be specified by reference You must pass kSecReturnAttributes and/or kSecReturnData to retrieve results; kSecReturnRef is currently not supported for synchronizable items - Persistent references to synchronizable items should be avoided; while they may work locally, they cannot be moved between devices, and may not resolve if the item is modified on some other device - When specifying a query that uses the kSecAttrSynchronizable key, search keys are limited to the item's class and attributes The only search constant which may be used is kSecMatchLimit; other constants using the kSecMatch prefix are not supported at this time @constant kSecAttrCreationDate (read-only) Specifies a dictionary key whose value is the item's creation date You use this key to get a value of type CFDateRef that represents the date the item was created @constant kSecAttrModificationDate (read-only) Specifies a dictionary key whose value is the item's modification date You use this key to get a value of type CFDateRef that represents the last time the item was updated @constant kSecAttrDescription Specifies a dictionary key whose value is the item's description attribute You use this key to set or get a value of type CFStringRef that represents a user-visible string describing this particular kind of item (eg, "disk image password") @constant kSecAttrComment Specifies a dictionary key whose value is the item's comment attribute You use this key to set or get a value of type CFStringRef containing the user-editable comment for this item @constant kSecAttrCreator Specifies a dictionary key whose value is the item's creator attribute You use this key to set or get a value of type CFNumberRef that represents the item's creator This number is the unsigned integer representation of a four-character code (eg, 'aCrt') @constant kSecAttrType Specifies a dictionary key whose value is the item's type attribute You use this key to set or get a value of type CFNumberRef that represents the item's type This number is the unsigned integer representation of a four-character code (eg, 'aTyp') @constant kSecAttrLabel Specifies a dictionary key whose value is the item's label attribute You use this key to set or get a value of type CFStringRef containing the user-visible label for this item @constant kSecAttrIsInvisible Specifies a dictionary key whose value is the item's invisible attribute You use this key to set or get a value of type CFBooleanRef that indicates whether the item is invisible (ie, should not be displayed) @constant kSecAttrIsNegative Specifies a dictionary key whose value is the item's negative attribute You use this key to set or get a value of type CFBooleanRef that indicates whether there is a valid password associated with this keychain item This is useful if your application doesn't want a password for some particular service to be stored in the keychain, but prefers that it always be entered by the user @constant kSecAttrAccount Specifies a dictionary key whose value is the item's account attribute You use this key to set or get a CFStringRef that contains an account name (Items of class kSecClassGenericPassword, kSecClassInternetPassword have this attribute) @constant kSecAttrService Specifies a dictionary key whose value is the item's service attribute You use this key to set or get a CFStringRef that represents the service associated with this item (Items of class kSecClassGenericPassword have this attribute) @constant kSecAttrGeneric Specifies a dictionary key whose value is the item's generic attribute You use this key to set or get a value of CFDataRef that contains a user-defined attribute (Items of class kSecClassGenericPassword have this attribute) @constant kSecAttrSecurityDomain Specifies a dictionary key whose value is the item's security domain attribute You use this key to set or get a CFStringRef value that represents the Internet security domain (Items of class kSecClassInternetPassword have this attribute) @constant kSecAttrServer Specifies a dictionary key whose value is the item's server attribute You use this key to set or get a value of type CFStringRef that contains the server's domain name or IP address (Items of class kSecClassInternetPassword have this attribute) @constant kSecAttrProtocol Specifies a dictionary key whose value is the item's protocol attribute You use this key to set or get a value of type CFNumberRef that denotes the protocol for this item (see the SecProtocolType enum in SecKeychainItemh) (Items of class kSecClassInternetPassword have this attribute) @constant kSecAttrAuthenticationType Specifies a dictionary key whose value is the item's authentication type attribute You use this key to set or get a value of type CFNumberRef that denotes the authentication scheme for this item (see the kSecAttrAuthenticationType value constants below) @constant kSecAttrPort Specifies a dictionary key whose value is the item's port attribute You use this key to set or get a CFNumberRef value that represents an Internet port number (Items of class kSecClassInternetPassword have this attribute) @constant kSecAttrPath Specifies a dictionary key whose value is the item's path attribute, typically this is the path component of the URL You use this key to set or get a CFStringRef value that represents a path (Items of class kSecClassInternetPassword have this attribute) @constant kSecAttrSubject (read-only) Specifies a dictionary key whose value is the item's subject You use this key to get a value of type CFDataRef that contains the X500 subject name of a certificate (Items of class kSecClassCertificate have this attribute) @constant kSecAttrIssuer (read-only) Specifies a dictionary key whose value is the item's issuer You use this key to get a value of type CFDataRef that contains the X500 issuer name of a certificate (Items of class kSecClassCertificate have this attribute) @constant kSecAttrSerialNumber (read-only) Specifies a dictionary key whose value is the item's serial number You use this key to get a value of type CFDataRef that contains the serial number data of a certificate (Items of class kSecClassCertificate have this attribute) @constant kSecAttrSubjectKeyID (read-only) Specifies a dictionary key whose value is the item's subject key ID You use this key to get a value of type CFDataRef that contains the subject key ID of a certificate (Items of class kSecClassCertificate have this attribute) @constant kSecAttrPublicKeyHash (read-only) Specifies a dictionary key whose value is the item's public key hash You use this key to get a value of type CFDataRef that contains the hash of a certificate's public key (Items of class kSecClassCertificate have this attribute) @constant kSecAttrCertificateType (read-only) Specifies a dictionary key whose value is the item's certificate type You use this key to get a value of type CFNumberRef that denotes the certificate type (Currently only the value of this attribute must be equal to the version of the X509 certificate So 1 for v1 2 for v2 and 3 for v3 certificates) Only items of class kSecClassCertificate have this attribute @constant kSecAttrCertificateEncoding (read-only) Specifies a dictionary key whose value is the item's certificate encoding You use this key to get a value of type CFNumberRef that denotes the certificate encoding (Currently only the value 3 meaning kSecAttrCertificateEncodingDER is supported) Only items of class kSecClassCertificate have this attribute @constant kSecAttrKeyClass (read only) Specifies a dictionary key whose value is one of kSecAttrKeyClassPublic, kSecAttrKeyClassPrivate or kSecAttrKeyClassSymmetric @constant kSecAttrApplicationLabel Specifies a dictionary key whose value is the key's application label attribute This is different from the kSecAttrLabel (which is intended to be human-readable) This attribute is used to look up a key programmatically; in particular, for keys of class kSecAttrKeyClassPublic and kSecAttrKeyClassPrivate, the value of this attribute is the hash of the public key @constant kSecAttrIsPermanent Specifies a dictionary key whose value is a CFBooleanRef indicating whether the key in question will be stored permanently @constant kSecAttrApplicationTag Specifies a dictionary key whose value is a CFDataRef containing private tag data @constant kSecAttrKeyType Specifies a dictionary key whose value is a CFNumberRef indicating the algorithm associated with this key (Currently only the value 42 is supported, alternatively you can use kSecAttrKeyTypeRSA) @constant kSecAttrKeySizeInBits Specifies a dictionary key whose value is a CFNumberRef indicating the number of bits in this key @constant kSecAttrEffectiveKeySize Specifies a dictionary key whose value is a CFNumberRef indicating the effective number of bits in this key For example, a DES key has a kSecAttrKeySizeInBits of 64, but a kSecAttrEffectiveKeySize of 56 bits @constant kSecAttrCanEncrypt Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to encrypt data @constant kSecAttrCanDecrypt Specifies a dictionary key whose value is a CFBooleanRef indicating whether the key in question can be used to decrypt data @constant kSecAttrCanDerive Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to derive another key @constant kSecAttrCanSign Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to create a digital signature @constant kSecAttrCanVerify Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to verify a digital signature @constant kSecAttrCanWrap Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to wrap another key @constant kSecAttrCanUnwrap Specifies a dictionary key whole value is a CFBooleanRef indicating whether the key in question can be used to unwrap another key @constant kSecAttrSyncViewHint Specifies a dictionary key whose value is a CFStringRef This value is part of the primary key of each item, and can be used to help distiguish Sync Views when defining their queries @constant kSecAttrTokenID Specifies a dictionary key whose presence indicates that item is backed by external token Value of this attribute is CFStringRef uniquely identifying containing token When this attribute is not present, item is stored in internal keychain database Note that once item is created, this attribute cannot be changed - in other words it is not possible to migrate existing items to, from or between tokens Currently the only available value for this attribute is kSecAttrTokenIDSecureEnclave, which indicates that item (private key) is backed by device's Secure Enclave */ extern const CFStringRef kSecAttrAccessible __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessControl __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0); extern const CFStringRef kSecAttrAccessGroup __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_3_0); extern const CFStringRef kSecAttrSynchronizable __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0); extern const CFStringRef kSecAttrCreationDate __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrModificationDate __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrDescription __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrComment __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCreator __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrType __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrLabel __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrIsInvisible __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrIsNegative __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAccount __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrService __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrGeneric __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrSecurityDomain __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrServer __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocol __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationType __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrPort __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrPath __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrSubject __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrIssuer __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrSerialNumber __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrSubjectKeyID __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrPublicKeyHash __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCertificateType __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCertificateEncoding __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrKeyClass __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrApplicationLabel __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrIsPermanent __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrApplicationTag __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrKeyType __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrKeySizeInBits __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrEffectiveKeySize __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanEncrypt __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanDecrypt __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanDerive __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanSign __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanVerify __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanWrap __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrCanUnwrap __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrSyncViewHint __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); extern const CFStringRef kSecAttrTokenID __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); /*! @enum kSecAttrAccessible Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrAccessible constant is the key and its value is one of the constants defined here When asking SecItemCopyMatching to return the item's data, the error errSecInteractionNotAllowed will be returned if the item's data is not available until a device unlock occurs @constant kSecAttrAccessibleWhenUnlocked Item data can only be accessed while the device is unlocked This is recommended for items that only need be accesible while the application is in the foreground Items with this attribute will migrate to a new device when using encrypted backups @constant kSecAttrAccessibleAfterFirstUnlock Item data can only be accessed once the device has been unlocked after a restart This is recommended for items that need to be accesible by background applications Items with this attribute will migrate to a new device when using encrypted backups @constant kSecAttrAccessibleAlways Item data can always be accessed regardless of the lock state of the device This is not recommended for anything except system use Items with this attribute will migrate to a new device when using encrypted backups @constant kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly Item data can only be accessed while the device is unlocked This class is only available if a passcode is set on the device This is recommended for items that only need to be accessible while the application is in the foreground Items with this attribute will never migrate to a new device, so after a backup is restored to a new device, these items will be missing No items can be stored in this class on devices without a passcode Disabling the device passcode will cause all items in this class to be deleted @constant kSecAttrAccessibleWhenUnlockedThisDeviceOnly Item data can only be accessed while the device is unlocked This is recommended for items that only need be accesible while the application is in the foreground Items with this attribute will never migrate to a new device, so after a backup is restored to a new device, these items will be missing @constant kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly Item data can only be accessed once the device has been unlocked after a restart This is recommended for items that need to be accessible by background applications Items with this attribute will never migrate to a new device, so after a backup is restored to a new device these items will be missing @constant kSecAttrAccessibleAlwaysThisDeviceOnly Item data can always be accessed regardless of the lock state of the device This option is not recommended for anything except system use Items with this attribute will never migrate to a new device, so after a backup is restored to a new device, these items will be missing */ extern const CFStringRef kSecAttrAccessibleWhenUnlocked __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessibleAfterFirstUnlock __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessibleAlways __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0); extern const CFStringRef kSecAttrAccessibleWhenUnlockedThisDeviceOnly __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); extern const CFStringRef kSecAttrAccessibleAlwaysThisDeviceOnly __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); /*! @enum kSecAttrProtocol Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrProtocol constant is the key and its value is one of the constants defined here @constant kSecAttrProtocolFTP @constant kSecAttrProtocolFTPAccount @constant kSecAttrProtocolHTTP @constant kSecAttrProtocolIRC @constant kSecAttrProtocolNNTP @constant kSecAttrProtocolPOP @constant kSecAttrProtocolSMTP @constant kSecAttrProtocolSOCKS @constant kSecAttrProtocolIMAP @constant kSecAttrProtocolLDAP @constant kSecAttrProtocolAppleTalk @constant kSecAttrProtocolAFP @constant kSecAttrProtocolTelnet @constant kSecAttrProtocolSSH @constant kSecAttrProtocolFTPS @constant kSecAttrProtocolHTTPS @constant kSecAttrProtocolHTTPProxy @constant kSecAttrProtocolHTTPSProxy @constant kSecAttrProtocolFTPProxy @constant kSecAttrProtocolSMB @constant kSecAttrProtocolRTSP @constant kSecAttrProtocolRTSPProxy @constant kSecAttrProtocolDAAP @constant kSecAttrProtocolEPPC @constant kSecAttrProtocolIPP @constant kSecAttrProtocolNNTPS @constant kSecAttrProtocolLDAPS @constant kSecAttrProtocolTelnetS @constant kSecAttrProtocolIMAPS @constant kSecAttrProtocolIRCS @constant kSecAttrProtocolPOP3S */ extern const CFStringRef kSecAttrProtocolFTP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolFTPAccount __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolHTTP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolIRC __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolNNTP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolPOP3 __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolSMTP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolSOCKS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolIMAP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolLDAP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolAppleTalk __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolAFP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolTelnet __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolSSH __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolFTPS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolHTTPS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolHTTPProxy __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolHTTPSProxy __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolFTPProxy __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolSMB __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolRTSP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolRTSPProxy __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolDAAP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolEPPC __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolIPP __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolNNTPS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolLDAPS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolTelnetS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolIMAPS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolIRCS __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrProtocolPOP3S __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum kSecAttrAuthenticationType Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrAuthenticationType constant is the key and its value is one of the constants defined here @constant kSecAttrAuthenticationTypeNTLM @constant kSecAttrAuthenticationTypeMSN @constant kSecAttrAuthenticationTypeDPA @constant kSecAttrAuthenticationTypeRPA @constant kSecAttrAuthenticationTypeHTTPBasic @constant kSecAttrAuthenticationTypeHTTPDigest @constant kSecAttrAuthenticationTypeHTMLForm @constant kSecAttrAuthenticationTypeDefault */ extern const CFStringRef kSecAttrAuthenticationTypeNTLM __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeMSN __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeDPA __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeRPA __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeHTTPBasic __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeHTTPDigest __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeHTMLForm __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecAttrAuthenticationTypeDefault __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum kSecAttrKeyClass Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrKeyClass constant is the key and its value is one of the constants defined here @constant kSecAttrKeyClassPublic @constant kSecAttrKeyClassPrivate @constant kSecAttrKeyClassSymmetric */ extern const CFStringRef kSecAttrKeyClassPublic __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecAttrKeyClassPrivate __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecAttrKeyClassSymmetric __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); /*! @enum kSecAttrKeyType Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrKeyType constant is the key and its value is one of the constants defined here @constant kSecAttrKeyTypeRSA @constant kSecAttrKeyTypeEC */ extern const CFStringRef kSecAttrKeyTypeRSA __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0); extern const CFStringRef kSecAttrKeyTypeEC __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_4_0); /*! @enum kSecAttrSynchronizable Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecAttrSynchronizable constant is the key and its value is one of the constants defined here @constant kSecAttrSynchronizableAny Specifies that both synchronizable and non-synchronizable results should be returned from this query This may be used as a value for the kSecAttrSynchronizable dictionary key in a call to SecItemCopyMatching, SecItemUpdate, or SecItemDelete */ extern const CFStringRef kSecAttrSynchronizableAny __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0); /*! @enum Search Constants @discussion Predefined search constants used to set values in a query dictionary You can specify a combination of search attributes and item attributes when looking for matching items with the SecItemCopyMatching function @constant kSecMatchPolicy Specifies a dictionary key whose value is a SecPolicyRef If provided, returned certificates or identities must verify with this policy @constant kSecMatchIssuers Specifies a dictionary key whose value is a CFArray of X500 names (of type CFDataRef) If provided, returned certificates or identities will be limited to those whose certificate chain contains one of the issuers provided in this list @constant kSecMatchEmailAddressIfPresent Specifies a dictionary key whose value is a CFStringRef containing an RFC822 email address If provided, returned certificates or identities will be limited to those that contain the address, or do not contain any email address @constant kSecMatchSubjectContains Specifies a dictionary key whose value is a CFStringRef If provided, returned certificates or identities will be limited to those containing this string in the subject @constant kSecMatchCaseInsensitive Specifies a dictionary key whose value is a CFBooleanRef If this value is kCFBooleanFalse, or is not provided, then case-sensitive string matching is performed @constant kSecMatchTrustedOnly Specifies a dictionary key whose value is a CFBooleanRef If provided with a value of kCFBooleanTrue, only certificates which can be verified back to a trusted anchor will be returned If this value is kCFBooleanFalse, or is not provided, then both trusted and untrusted certificates may be returned @constant kSecMatchValidOnDate Specifies a dictionary key whose value is of type CFDateRef If provided, returned keys, certificates or identities will be limited to those which are valid for the given date Pass a value of kCFNull to indicate the current date @constant kSecMatchLimit Specifies a dictionary key whose value is a CFNumberRef If provided, this value specifies the maximum number of results to return If not provided, results are limited to the first item found Predefined values are provided for a single item (kSecMatchLimitOne) and all matching items (kSecMatchLimitAll) @constant kSecMatchLimitOne Specifies that results are limited to the first item found; used as a value for the kSecMatchLimit dictionary key @constant kSecMatchLimitAll Specifies that an unlimited number of results may be returned; used as a value for the kSecMatchLimit dictionary key */ extern const CFStringRef kSecMatchPolicy __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchItemList __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchSearchList __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchIssuers __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchEmailAddressIfPresent __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchSubjectContains __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchCaseInsensitive __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchTrustedOnly __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchValidOnDate __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchLimit __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchLimitOne __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecMatchLimitAll __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum Return Type Key Constants @discussion Predefined return type keys used to set values in a dictionary You use these keys to specify the type of results which should be returned by the SecItemCopyMatching or SecItemAdd function You can specify zero or more of these return types If more than one of these result types is specified, the result is returned as a CFDictionaryRef whose keys are the result types and values are the requested data @constant kSecReturnData Specifies a dictionary key whose value is of type CFBooleanRef A value of kCFBooleanTrue indicates that the data of an item (CFDataRef) should be returned For keys and password items, data is secret (encrypted) and may require the user to enter a password for access @constant kSecReturnAttributes Specifies a dictionary key whose value is of type CFBooleanRef A value of kCFBooleanTrue indicates that the (non-encrypted) attributes of an item (CFDictionaryRef) should be returned @constant kSecReturnRef Specifies a dictionary key whose value is a CFBooleanRef A value of kCFBooleanTrue indicates that a reference should be returned Depending on the item class requested, the returned reference(s) may be of type SecKeychainItemRef, SecKeyRef, SecCertificateRef, or SecIdentityRef @constant kSecReturnPersistentRef Specifies a dictionary key whose value is of type CFBooleanRef A value of kCFBooleanTrue indicates that a persistent reference to an item (CFDataRef) should be returned */ extern const CFStringRef kSecReturnData __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecReturnAttributes __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecReturnRef __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecReturnPersistentRef __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum Value Type Key Constants @discussion Predefined value type keys used to pass values in a dictionary You can specify zero or more of these types depending on the function you are calling For SecItemCopyMatching or SecItemAdd these are used as keys in the results dictionary @constant kSecValueData Specifies a dictionary key whose value is of type CFDataRef For keys and password items, data is secret (encrypted) and may require the user to enter a password for access @constant kSecValueRef Specifies a dictionary key whose value, depending on the item class requested, is of type SecKeychainItemRef, SecKeyRef, SecCertificateRef, or SecIdentityRef @constant kSecValuePersistentRef Specifies a dictionary key whose value is of type CFDataRef The bytes in this CFDataRef can be stored by the caller and used on a subsequent invocation of the application (or even a different application) to retrieve the item referenced by it */ extern const CFStringRef kSecValueData __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecValueRef __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecValuePersistentRef __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @enum Other Constants @discussion Predefined constants used to set values in a dictionary @constant kSecUseItemList Specifies a dictionary key whose value is a CFArray of items If provided, this array is treated as the set of all possible items to search, or add if the API being called is SecItemAdd The items in this array may be of type SecKeyRef, SecCertificateRef, SecIdentityRef, or CFDataRef (for a persistent item reference) The items in the array must all be of the same type When this attribute is provided, no keychains are searched @constant kSecUseOperationPrompt Specifies a dictionary key whose value is a CFStringRef that represents a user-visible string describing the operation for which the application is attempting to authenticate The application is responsible for the text localization @constant kSecUseNoAuthenticationUI Specifies a dictionary key whose value is a CFBooleanRef If provided with a value of kCFBooleanTrue, the error errSecInteractionNotAllowed will be returned if the item is attempting to authenticate with UI @constant kSecUseAuthenticationUI Specifies a dictionary key whose value is one of kSecUseAuthenticationUIAllow, kSecUseAuthenticationUIFail, kSecUseAuthenticationUISkip @constant kSecUseAuthenticationContext Specifies a dictionary key whose value is LAContext to be used for keychain item authentication * If the item requires authentication and this key is omitted, a new context will be created just for the purpose of the single call * If the specified context has been previously authenticated, the operation will succeed without asking user for authentication * If the specified context has not been previously authenticated, the new authentication will be started on this context, allowing caller to eventually reuse the sucessfully authenticated context in subsequent keychain operations */ extern const CFStringRef kSecUseItemList __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); extern const CFStringRef kSecUseOperationPrompt __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0); extern const CFStringRef kSecUseNoAuthenticationUI __OSX_AVAILABLE_BUT_DEPRECATED_MSG(__MAC_10_10, __MAC_10_11, __IPHONE_8_0, __IPHONE_9_0, "Use a kSecAuthenticationUI instead"); extern const CFStringRef kSecUseAuthenticationUI __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); extern const CFStringRef kSecUseAuthenticationContext __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); /*! @enum kSecUseAuthenticationUI Value Constants @discussion Predefined item attribute constants used to get or set values in a dictionary The kSecUseAuthenticationUI constant is the key and its value is one of the constants defined here If the key kSecUseAuthenticationUI not provided then kSecUseAuthenticationUIAllow is used as default @constant kSecUseAuthenticationUIAllow Specifies that authenticate UI can appear @constant kSecUseAuthenticationUIFail Specifies that the error errSecInteractionNotAllowed will be returned if an item needs to authenticate with UI @constant kSecUseAuthenticationUIAllowSkip Specifies that all items which need to authenticate with UI will be silently skipped This value can be used only with SecItemCopyMatching */ extern const CFStringRef kSecUseAuthenticationUIAllow __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); extern const CFStringRef kSecUseAuthenticationUIFail __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); extern const CFStringRef kSecUseAuthenticationUISkip __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0); /*! @enum kSecAttrTokenID Value Constants @discussion Predefined item attribute constant used to get or set values in a dictionary The kSecAttrTokenID constant is the key and its value can be kSecAttrTokenIDSecureEnclave @constant kSecAttrTokenIDSecureEnclave Specifies well-known identifier of the token implemented using device's Secure Enclave The only keychain items supported by the Secure Enclave token are 256-bit elliptic curve keys (kSecAttrKeyTypeEC) Keys must be generated on the secure enclave using SecKeyGenerateKeyPair call with kSecAttrTokenID set to kSecAttrTokenIDSecureEnclave in the parameters dictionary, it is not possible to import pregenerated keys to kSecAttrTokenIDSecureEnclave token */ extern const CFStringRef kSecAttrTokenIDSecureEnclave __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_9_0); /*! @function SecItemCopyMatching @abstract Returns one or more items which match a search query @param query A dictionary containing an item class specification and optional attributes for controlling the search See the "Keychain Search Attributes" section for a description of currently defined search attributes @param result On return, a CFTypeRef reference to the found item(s) The exact type of the result is based on the search attributes supplied in the query, as discussed below @result A result code See "Security Error Codes" (SecBaseh) @discussion Attributes defining a search are specified by adding key/value pairs to the query dictionary A typical query consists of: * a kSecClass key, whose value is a constant from the Class Constants section that specifies the class of item(s) to be searched * one or more keys from the "Attribute Key Constants" section, whose value is the attribute data to be matched * one or more keys from the "Search Constants" section, whose value is used to further refine the search * a key from the "Return Type Key Constants" section, specifying the type of results desired Result types are specified as follows: * To obtain the data of a matching item (CFDataRef), specify kSecReturnData with a value of kCFBooleanTrue * To obtain the attributes of a matching item (CFDictionaryRef), specify kSecReturnAttributes with a value of kCFBooleanTrue * To obtain a reference to a matching item (SecKeychainItemRef, SecKeyRef, SecCertificateRef, or SecIdentityRef), specify kSecReturnRef with a value of kCFBooleanTrue * To obtain a persistent reference to a matching item (CFDataRef), specify kSecReturnPersistentRef with a value of kCFBooleanTrue Note that unlike normal references, a persistent reference may be stored on disk or passed between processes * If more than one of these result types is specified, the result is returned as a CFDictionaryRef containing all the requested data * If a result type is not specified, no results are returned By default, this function returns only the first match found To obtain more than one matching item at a time, specify kSecMatchLimit with a value greater than The result will be a CFArrayRef containing up to that number of matching items; the items' types are described above To filter a provided list of items down to those matching the query, specify a kSecMatchItemList whose value is a CFArray of SecKeychainItemRef, SecKeyRef, SecCertificateRef, or SecIdentityRef items The objects in the provided array must be of the same type To convert from a persistent item reference to a normal item reference, specify a kSecValuePersistentRef whose value a CFDataRef (the persistent reference), and a kSecReturnRef whose value is kCFBooleanTrue */ OSStatus SecItemCopyMatching(CFDictionaryRef query, CFTypeRef * __nullable CF_RETURNS_RETAINED result) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @function SecItemAdd @abstract Add one or more items to a keychain @param attributes A dictionary containing an item class specification and optional entries specifying the item's attribute values See the "Attribute Key Constants" section for a description of currently defined attributes @param result On return, a CFTypeRef reference to the newly added item(s) The exact type of the result is based on the values supplied in attributes, as discussed below Pass NULL if this result is not required @result A result code See "Security Error Codes" (SecBaseh) @discussion Attributes defining an item are specified by adding key/value pairs to the attributes dictionary To add multiple items to a keychain at once use the kSecUseItemList key with an array of items as its value This is currently only supported for non password items Result types are specified as follows: * To obtain the data of the added item (CFDataRef), specify kSecReturnData with a value of kCFBooleanTrue * To obtain all the attributes of the added item (CFDictionaryRef), specify kSecReturnAttributes with a value of kCFBooleanTrue * To obtain a reference to the added item (SecKeychainItemRef, SecKeyRef, SecCertificateRef, or SecIdentityRef), specify kSecReturnRef with a value of kCFBooleanTrue * To obtain a persistent reference to the added item (CFDataRef), specify kSecReturnPersistentRef with a value of kCFBooleanTrue Note that unlike normal references, a persistent reference may be stored on disk or passed between processes * If more than one of these result types is specified, the result is returned as a CFDictionaryRef containing all the requested data * If a result type is not specified, no results are returned */ OSStatus SecItemAdd(CFDictionaryRef attributes, CFTypeRef * __nullable CF_RETURNS_RETAINED result) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @function SecItemUpdate @abstract Modify zero or more items which match a search query @param query A dictionary containing an item class specification and optional attributes for controlling the search See the "Attribute Constants" and "Search Constants" sections for a description of currently defined search attributes @param attributesToUpdate A dictionary containing one or more attributes whose values should be set to the ones specified Only real keychain attributes are permitted in this dictionary (no "meta" attributes are allowed) See the "Attribute Key Constants" section for a description of currently defined value attributes @result A result code See "Security Error Codes" (SecBaseh) @discussion Attributes defining a search are specified by adding key/value pairs to the query dictionary */ OSStatus SecItemUpdate(CFDictionaryRef query, CFDictionaryRef attributesToUpdate) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); /*! @function SecItemDelete @abstract Delete zero or more items which match a search query @param query A dictionary containing an item class specification and optional attributes for controlling the search See the "Attribute Constants" and "Search Constants" sections for a description of currently defined search attributes @result A result code See "Security Error Codes" (SecBaseh) @discussion Attributes defining a search are specified by adding key/value pairs to the query dictionary By default, this function deletes all items matching the specified query You can change this behavior by specifying one of the follow keys: * To delete an item identified by a transient reference, specify kSecValueRef with a reference returned by using the kSecReturnRef key in a previous call to SecItemCopyMatching or SecItemAdd * To delete an item identified by a persistent reference, specify kSecValuePersistentRef with a persistent reference returned by using the kSecReturnPersistentRef key to SecItemCopyMatching or SecItemAdd * To delete multiple items specify kSecMatchItemList with an array of references * If more than one of these result keys is specified, the behavior is undefined */ OSStatus SecItemDelete(CFDictionaryRef query) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0); CF_IMPLICIT_BRIDGING_DISABLED CF_ASSUME_NONNULL_END __END_DECLS #endif /* !_SECURITY_SECITEM_H_ */
二、苹果官方的KeychainItemWrapper
官方示例地址
https://developer.apple.com/library/ios/samplecode/GenericKeychain/Listings/Classes_KeychainItemWrapper_m.html#//apple_ref/doc/uid/DTS40007797-Classes_KeychainItemWrapper_m-DontLinkElementID_10
/* File: KeychainItemWrapperm Abstract: Objective-C wrapper for accessing a single keychain item Version: 2 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc ("Apple") in consideration of your agreement to the following terms, and your use, installation, modification or redistribution of this Apple software constitutes acceptance of these terms If you do not agree with these terms, please do not use, install, modify or redistribute this Apple software In consideration of your agreement to abide by the following terms, and subject to these terms, Apple grants you a personal, non-exclusive license, under Apple's copyrights in this original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the Apple Software, with or without modifications, in source and/or binary forms; provided that if you redistribute the Apple Software in its entirety and without modifications, you must retain this notice and the following text and disclaimers in all such redistributions of the Apple Software Neither the name, trademarks, service marks or logos of Apple Inc may be used to endorse or promote products derived from the Apple Software without specific prior written permission from Apple Except as expressly stated in this notice, no other rights or licenses, express or implied, are granted by Apple herein, including but not limited to any patent rights that may be infringed by your derivative works or by other works in which the Apple Software may be incorporated The Apple Software is provided by Apple on an "AS IS" basis APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE Copyright (C) 2010 Apple Inc All Rights Reserved */ #import "KeychainItemWrapperh" #import <Security/Securityh> /* These are the default constants and their respective types, available for the kSecClassGenericPassword Keychain Item class: kSecAttrAccessGroup - CFStringRef kSecAttrCreationDate - CFDateRef kSecAttrModificationDate - CFDateRef kSecAttrDescription - CFStringRef kSecAttrComment - CFStringRef kSecAttrCreator - CFNumberRef kSecAttrType - CFNumberRef kSecAttrLabel - CFStringRef kSecAttrIsInvisible - CFBooleanRef kSecAttrIsNegative - CFBooleanRef kSecAttrAccount - CFStringRef kSecAttrService - CFStringRef kSecAttrGeneric - CFDataRef See the header file Security/SecItemh for more details */ @interface KeychainItemWrapper (PrivateMethods) /* The decision behind the following two methods (secItemFormatToDictionary and dictionaryToSecItemFormat) was to encapsulate the transition between what the detail view controller was expecting (NSString *) and what the Keychain API expects as a validly constructed container class */ - (NSMutableDictionary *)secItemFormatToDictionary:(NSDictionary *)dictionaryToConvert; - (NSMutableDictionary *)dictionaryToSecItemFormat:(NSDictionary *)dictionaryToConvert; // Updates the item in the keychain, or adds it if it doesn't exist - (void)writeToKeychain; @end @implementation KeychainItemWrapper @synthesize keychainItemData, genericPasswordQuery; - (id)initWithIdentifier: (NSString *)identifier accessGroup:(NSString *) accessGroup; { if (self = [super init]) { // Begin Keychain search setup The genericPasswordQuery leverages the special user // defined attribute kSecAttrGeneric to distinguish itself between other generic Keychain // items which may be included by the same application genericPasswordQuery = [[NSMutableDictionary alloc] init]; [genericPasswordQuery setObject:(id)kSecClassGenericPassword forKey:(id)kSecClass]; [genericPasswordQuery setObject:identifier forKey:(id)kSecAttrGeneric]; // The keychain access group attribute determines if this item can be shared // amongst multiple apps whose code signing entitlements contain the same keychain access group if (accessGroup != nil) { #if TARGET_IPHONE_SIMULATOR // Ignore the access group if running on the iPhone simulator // // Apps that are built for the simulator aren't signed, so there's no keychain access group // for the simulator to check This means that all apps can see all keychain items when run // on the simulator // // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the // simulator will return -25243 (errSecNoAccessForItem) #else [genericPasswordQuery setObject:accessGroup forKey:(id)kSecAttrAccessGroup]; #endif } // Use the proper search constants, return only the attributes of the first match [genericPasswordQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit]; [genericPasswordQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnAttributes]; NSDictionary *tempQuery = [NSDictionary dictionaryWithDictionary:genericPasswordQuery]; NSMutableDictionary *outDictionary = nil; if (! SecItemCopyMatching((CFDictionaryRef)tempQuery, (CFTypeRef *)&outDictionary) == noErr) { // Stick these default values into keychain item if nothing found [self resetKeychainItem]; // Add the generic attribute and the keychain access group [keychainItemData setObject:identifier forKey:(id)kSecAttrGeneric]; if (accessGroup != nil) { #if TARGET_IPHONE_SIMULATOR // Ignore the access group if running on the iPhone simulator // // Apps that are built for the simulator aren't signed, so there's no keychain access group // for the simulator to check This means that all apps can see all keychain items when run // on the simulator // // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the // simulator will return -25243 (errSecNoAccessForItem) #else [keychainItemData setObject:accessGroup forKey:(id)kSecAttrAccessGroup]; #endif } } else { // load the saved data from Keychain selfkeychainItemData = [self secItemFormatToDictionary:outDictionary]; } [outDictionary release]; } return self; } - (void)dealloc { [keychainItemData release]; [genericPasswordQuery release]; [super dealloc]; } - (void)setObject:(id)inObject forKey:(id)key { if (inObject == nil) return; id currentObject = [keychainItemData objectForKey:key]; if (![currentObject isEqual:inObject]) { [keychainItemData setObject:inObject forKey:key]; [self writeToKeychain]; } } - (id)objectForKey:(id)key { return [keychainItemData objectForKey:key]; } - (void)resetKeychainItem { OSStatus junk = noErr; if (!keychainItemData) { selfkeychainItemData = [[NSMutableDictionary alloc] init]; } else if (keychainItemData) { NSMutableDictionary *tempDictionary = [self dictionaryToSecItemFormat:keychainItemData]; junk = SecItemDelete((CFDictionaryRef)tempDictionary); NSAssert( junk == noErr || junk == errSecItemNotFound, @"Problem deleting current dictionary" ); } // Default attributes for keychain item [keychainItemData setObject:@"" forKey:(id)kSecAttrAccount]; [keychainItemData setObject:@"" forKey:(id)kSecAttrLabel]; [keychainItemData setObject:@"" forKey:(id)kSecAttrDescription]; // Default data for keychain item [keychainItemData setObject:@"" forKey:(id)kSecValueData]; } - (NSMutableDictionary *)dictionaryToSecItemFormat:(NSDictionary *)dictionaryToConvert { // The assumption is that this method will be called with a properly populated dictionary // containing all the right key/value pairs for a SecItem // Create a dictionary to return populated with the attributes and data NSMutableDictionary *returnDictionary = [NSMutableDictionary dictionaryWithDictionary:dictionaryToConvert]; // Add the Generic Password keychain item class attribute [returnDictionary setObject:(id)kSecClassGenericPassword forKey:(id)kSecClass]; // Convert the NSString to NSData to meet the requirements for the value type kSecValueData // This is where to store sensitive data that should be encrypted NSString *passwordString = [dictionaryToConvert objectForKey:(id)kSecValueData]; [returnDictionary setObject:[passwordString dataUsingEncoding:NSUTF8StringEncoding] forKey:(id)kSecValueData]; return returnDictionary; } - (NSMutableDictionary *)secItemFormatToDictionary:(NSDictionary *)dictionaryToConvert { // The assumption is that this method will be called with a properly populated dictionary // containing all the right key/value pairs for the UI element // Create a dictionary to return populated with the attributes and data NSMutableDictionary *returnDictionary = [NSMutableDictionary dictionaryWithDictionary:dictionaryToConvert]; // Add the proper search key and class attribute [returnDictionary setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData]; [returnDictionary setObject:(id)kSecClassGenericPassword forKey:(id)kSecClass]; // Acquire the password data from the attributes NSData *passwordData = NULL; if (SecItemCopyMatching((CFDictionaryRef)returnDictionary, (CFTypeRef *)&passwordData) == noErr) { // Remove the search, class, and identifier key/value, we don't need them anymore [returnDictionary removeObjectForKey:(id)kSecReturnData]; // Add the password to the dictionary, converting from NSData to NSString NSString *password = [[[NSString alloc] initWithBytes:[passwordData bytes] length:[passwordData length] encoding:NSUTF8StringEncoding] autorelease]; [returnDictionary setObject:password forKey:(id)kSecValueData]; } else { // Don't do anything if nothing is found NSAssert(NO, @"Serious error, no matching item found in the keychainn"); } [passwordData release]; return returnDictionary; } - (void)writeToKeychain { NSDictionary *attributes = NULL; NSMutableDictionary *updateItem = NULL; OSStatus result; if (SecItemCopyMatching((CFDictionaryRef)genericPasswordQuery, (CFTypeRef *)&attributes) == noErr) { // First we need the attributes from the Keychain updateItem = [NSMutableDictionary dictionaryWithDictionary:attributes]; // Second we need to add the appropriate search key/values [updateItem setObject:[genericPasswordQuery objectForKey:(id)kSecClass] forKey:(id)kSecClass]; // Lastly, we need to set up the updated attribute list being careful to remove the class NSMutableDictionary *tempCheck = [self dictionaryToSecItemFormat:keychainItemData]; [tempCheck removeObjectForKey:(id)kSecClass]; #if TARGET_IPHONE_SIMULATOR // Remove the access group if running on the iPhone simulator // // Apps that are built for the simulator aren't signed, so there's no keychain access group // for the simulator to check This means that all apps can see all keychain items when run // on the simulator // // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the // simulator will return -25243 (errSecNoAccessForItem) // // The access group attribute will be included in items returned by SecItemCopyMatching, // which is why we need to remove it before updating the item [tempCheck removeObjectForKey:(id)kSecAttrAccessGroup]; #endif // An implicit assumption is that you can only update a single item at a time result = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)tempCheck); NSAssert( result == noErr, @"Couldn't update the Keychain Item" ); } else { // No previous item found; add the new one result = SecItemAdd((CFDictionaryRef)[self dictionaryToSecItemFormat:keychainItemData], NULL); NSAssert( result == noErr, @"Couldn't add the Keychain Item" ); } } @end
看到这里会发现苹果的KeychainWrapper和我们自定义的工具类实现原理都一样，就是调用那几个方法，所以就不展开介绍了，将来有空再补上。
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