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//CFTypeRef kSecClassGenericPassword            //一般密码

//CFTypeRef kSecClassInternetPassword           //网络密码

//CFTypeRef kSecClassCertificate                //证书

//CFTypeRef kSecClassKey                        //密钥

//CFTypeRef kSecClassIdentity                   //身份证书(带私钥的证书)

//不同类型的钥匙串项对应的属性不同

//一般密码

//kSecClassGenericPassword

//对应属性

//kSecAttrAccessible

//kSecAttrAccessGroup

//kSecAttrCreationDate

//kSecAttrModificationDate

//kSecAttrDescription

//kSecAttrComment

//kSecAttrCreator

//kSecAttrType

//kSecAttrLabel

//kSecAttrIsInvisible

//kSecAttrIsNegative

//kSecAttrAccount

//kSecAttrService

//kSecAttrGeneric

//网络密码

//kSecClassInternetPassword

//对应属性

//kSecAttrAccessible

//kSecAttrAccessGroup

//kSecAttrCreationDate

//kSecAttrModificationDate

//kSecAttrDescription

//kSecAttrComment

//kSecAttrCreator

//kSecAttrType

//kSecAttrLabel

//kSecAttrIsInvisible

//kSecAttrIsNegative

//kSecAttrAccount

//kSecAttrSecurityDomain

//kSecAttrServer

//kSecAttrProtocol

//kSecAttrAuthenticationType

//kSecAttrPort

//kSecAttrPath

//kSecClassCertificate

//对应属性

//kSecAttrAccessible

//kSecAttrAccessGroup

//kSecAttrCertificateType

//kSecAttrCertificateEncoding

//kSecAttrLabel

//kSecAttrSubject

//kSecAttrIssuer

//kSecAttrSerialNumber

//kSecAttrSubjectKeyID

//kSecAttrPublicKeyHash

//kSecClassKey

//对应属性

//kSecAttrAccessible

//kSecAttrAccessGroup

//kSecAttrKeyClass

//kSecAttrLabel

//kSecAttrApplicationLabel

//kSecAttrIsPermanent

//kSecAttrApplicationTag

//kSecAttrKeyType

//kSecAttrKeySizeInBits

//kSecAttrEffectiveKeySize

//kSecAttrCanEncrypt

//kSecAttrCanDecrypt

//kSecAttrCanDerive

//kSecAttrCanSign

//kSecAttrCanVerify

//kSecAttrCanWrap

//kSecAttrCanUnwrap

//身份证书(带私钥的证书)

//kSecClassIdentity

//对应属性

//   证书属性

//   私钥属性

#pragma mark- 属性

//CFTypeRef kSecAttrAccessible;                                        //可访问性 类型透明

//          CFTypeRef kSecAttrAccessibleWhenUnlocked;                  //解锁可访问,备份

//          CFTypeRef kSecAttrAccessibleAfterFirstUnlock;              //第一次解锁后可访问,备份

//          CFTypeRef kSecAttrAccessibleAlways;                        //一直可访问,备份

//          CFTypeRef kSecAttrAccessibleWhenUnlockedThisDeviceOnly;    //解锁可访问,不备份

//          CFTypeRef kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly;//第一次解锁后可访问,不备份

//          CFTypeRef kSecAttrAccessibleAlwaysThisDeviceOnly;          //一直可访问,不备份

//CFTypeRef kSecAttrCreationDate;      //创建日期          CFDateRef

//CFTypeRef kSecAttrModificationDate;  //最后一次修改日期   CFDateRef

//CFTypeRef kSecAttrDescription;       //描述             CFStringRef

//CFTypeRef kSecAttrComment;           //注释             CFStringRef

//CFTypeRef kSecAttrCreator;           //创建者            CFNumberRef(4字符,如'aLXY')

//CFTypeRef kSecAttrType;              //类型             CFNumberRef(4字符,如'aTyp')

//CFTypeRef kSecAttrLabel;             //标签(给用户看)     CFStringRef

//CFTypeRef kSecAttrIsInvisible;       //是否隐藏          CFBooleanRef(kCFBooleanTrue,kCFBooleanFalse)

//CFTypeRef kSecAttrIsNegative;        //是否具有密码       CFBooleanRef(kCFBooleanTrue,kCFBooleanFalse)此项表示当前的item是否只是一个占位项,或者说是只有key没有value。

//CFTypeRef kSecAttrAccount;           //账户名            CFStringRef

//CFTypeRef kSecAttrService;           //所具有服务         CFStringRef

//CFTypeRef kSecAttrGeneric;           //用户自定义内容      CFDataRef

//CFTypeRef kSecAttrSecurityDomain;    //网络安全域         CFStringRef

//CFTypeRef kSecAttrServer;            //服务器域名或IP地址  CFStringRef

//CFTypeRef kSecAttrProtocol;                      //协议类型 CFNumberRef

//          值

//          CFTypeRef kSecAttrProtocolFTP;         //

//          CFTypeRef kSecAttrProtocolFTPAccount;  //

//          CFTypeRef kSecAttrProtocolHTTP;        //

//          CFTypeRef kSecAttrProtocolIRC;         //

//          CFTypeRef kSecAttrProtocolNNTP;        //

//          CFTypeRef kSecAttrProtocolPOP3;        //

//          CFTypeRef kSecAttrProtocolSMTP;        //

//          CFTypeRef kSecAttrProtocolSOCKS;       //

//          CFTypeRef kSecAttrProtocolIMAP;        //

//          CFTypeRef kSecAttrProtocolLDAP;        //

//          CFTypeRef kSecAttrProtocolAppleTalk;   //

//          CFTypeRef kSecAttrProtocolAFP;         //

//          CFTypeRef kSecAttrProtocolTelnet;      //

//          CFTypeRef kSecAttrProtocolSSH;         //

//          CFTypeRef kSecAttrProtocolFTPS;        //

//          CFTypeRef kSecAttrProtocolHTTPS;       //

//          CFTypeRef kSecAttrProtocolHTTPProxy;   //

//          CFTypeRef kSecAttrProtocolHTTPSProxy;  //

//          CFTypeRef kSecAttrProtocolFTPProxy;    //

//          CFTypeRef kSecAttrProtocolSMB;         //

//          CFTypeRef kSecAttrProtocolRTSP;        //

//          CFTypeRef kSecAttrProtocolRTSPProxy;   //

//          CFTypeRef kSecAttrProtocolDAAP;        //

//          CFTypeRef kSecAttrProtocolEPPC;        //

//          CFTypeRef kSecAttrProtocolIPP;         //

//          CFTypeRef kSecAttrProtocolNNTPS;       //

//          CFTypeRef kSecAttrProtocolLDAPS;       //

//          CFTypeRef kSecAttrProtocolTelnetS;     //

//          CFTypeRef kSecAttrProtocolIMAPS;       //

//          CFTypeRef kSecAttrProtocolIRCS;        //

//          CFTypeRef kSecAttrProtocolPOP3S;       //

//CFTypeRef kSecAttrAuthenticationType;                      //认证类型 CFNumberRef

//          值

//          CFTypeRef kSecAttrAuthenticationTypeNTLM;        //

//          CFTypeRef kSecAttrAuthenticationTypeMSN;         //

//          CFTypeRef kSecAttrAuthenticationTypeDPA;         //

//          CFTypeRef kSecAttrAuthenticationTypeRPA;         //

//          CFTypeRef kSecAttrAuthenticationTypeHTTPBasic;   //

//          CFTypeRef kSecAttrAuthenticationTypeHTTPDigest;  //

//          CFTypeRef kSecAttrAuthenticationTypeHTMLForm;    //

//          CFTypeRef kSecAttrAuthenticationTypeDefault;     //

//CFTypeRef kSecAttrPort;                 //网络端口           CFNumberRef

//CFTypeRef kSecAttrPath;                 //访问路径           CFStringRef

//CFTypeRef kSecAttrSubject;              //X.500主题名称      CFDataRef

//CFTypeRef kSecAttrIssuer;               //X.500发行者名称     CFDataRef

//CFTypeRef kSecAttrSerialNumber;         //序列号             CFDataRef

//CFTypeRef kSecAttrSubjectKeyID;         //主题ID             CFDataRef

//CFTypeRef kSecAttrPublicKeyHash;        //公钥Hash值         CFDataRef

//CFTypeRef kSecAttrCertificateType;      //证书类型            CFNumberRef

//CFTypeRef kSecAttrCertificateEncoding;  //证书编码类型        CFNumberRef

//CFTypeRef kSecAttrKeyClass;                     //加密密钥类  CFTypeRef

//          值

//          CFTypeRef kSecAttrKeyClassPublic;     //公钥

//          CFTypeRef kSecAttrKeyClassPrivate;    //私钥

//          CFTypeRef kSecAttrKeyClassSymmetric;  //对称密钥

//CFTypeRef kSecAttrApplicationLabel;  //标签(给程序使用)          CFStringRef(通常是公钥的Hash值)

//CFTypeRef kSecAttrIsPermanent;       //是否永久保存加密密钥       CFBooleanRef

//CFTypeRef kSecAttrApplicationTag;    //标签(私有标签数据)         CFDataRef

//CFTypeRef kSecAttrKeyType;  //加密密钥类型(算法)   CFNumberRef

//          值

//          extern const CFTypeRef kSecAttrKeyTypeRSA;

//CFTypeRef kSecAttrKeySizeInBits;     //密钥总位数               CFNumberRef

//CFTypeRef kSecAttrEffectiveKeySize;  //密钥有效位数              CFNumberRef

//CFTypeRef kSecAttrCanEncrypt;        //密钥是否可用于加密         CFBooleanRef

//CFTypeRef kSecAttrCanDecrypt;        //密钥是否可用于加密         CFBooleanRef

//CFTypeRef kSecAttrCanDerive;         //密钥是否可用于导出其他密钥   CFBooleanRef

//CFTypeRef kSecAttrCanSign;           //密钥是否可用于数字签名      CFBooleanRef

//CFTypeRef kSecAttrCanVerify;         //密钥是否可用于验证数字签名   CFBooleanRef

//CFTypeRef kSecAttrCanWrap;           //密钥是否可用于打包其他密钥   CFBooleanRef

//CFTypeRef kSecAttrCanUnwrap;         //密钥是否可用于解包其他密钥   CFBooleanRef

//CFTypeRef kSecAttrAccessGroup;       //访问组                   CFStringRef

#pragma mark- 搜索

//CFTypeRef kSecMatchPolicy;                 //指定策略            SecPolicyRef

//CFTypeRef kSecMatchItemList;               //指定搜索范围         CFArrayRef(SecKeychainItemRef, SecKeyRef, SecCertificateRef, SecIdentityRef,CFDataRef)数组内的类型必须唯一。仍然会搜索钥匙串,但是搜索结果需要与该数组取交集作为最终结果。

//CFTypeRef kSecMatchSearchList;             //

//CFTypeRef kSecMatchIssuers;                //指定发行人数组       CFArrayRef

//CFTypeRef kSecMatchEmailAddressIfPresent;  //指定邮件地址         CFStringRef

//CFTypeRef kSecMatchSubjectContains;        //指定主题            CFStringRef

//CFTypeRef kSecMatchCaseInsensitive;        //指定是否不区分大小写  CFBooleanRef(kCFBooleanFalse或不提供此参数,区分大小写;kCFBooleanTrue,不区分大小写)

//CFTypeRef kSecMatchTrustedOnly;            //指定只搜索可信证书    CFBooleanRef(kCFBooleanFalse或不提供此参数,全部证书;kCFBooleanTrue,只搜索可信证书)

//CFTypeRef kSecMatchValidOnDate;            //指定有效日期         CFDateRef(kCFNull表示今天)

//CFTypeRef kSecMatchLimit;                  //指定结果数量         CFNumberRef(kSecMatchLimitOne;kSecMatchLimitAll)

//CFTypeRef kSecMatchLimitOne;               //首条结果

//CFTypeRef kSecMatchLimitAll;               //全部结果

#pragma mark- 列表

//CFTypeRef kSecUseItemList;   //CFArrayRef(SecKeychainItemRef, SecKeyRef, SecCertificateRef, SecIdentityRef,CFDataRef)数组内的类型必须唯一。用户提供用于查询的列表。当这个列表被提供的时候,不会再搜索钥匙串。

#pragma mark- 返回值类型

//可以同时指定多种返回值类型

//CFTypeRef kSecReturnData;           //返回数据(CFDataRef)                  CFBooleanRef

//CFTypeRef kSecReturnAttributes;     //返回属性字典(CFDictionaryRef)         CFBooleanRef

//CFTypeRef kSecReturnRef;            //返回实例(SecKeychainItemRef, SecKeyRef, SecCertificateRef, SecIdentityRef, or CFDataRef)         CFBooleanRef

//CFTypeRef kSecReturnPersistentRef;  //返回持久型实例(CFDataRef)             CFBooleanRef

#pragma mark- 写入值类型

//CFTypeRef kSecValueData;

//CFTypeRef kSecValueRef;

//CFTypeRef kSecValuePersistentRef;