iOS開發——keychain的使用

通常情況下，我們用NSUserDefaults存儲數據信息，但是對於一些私密信息，比如密碼、證書等等，就需要使用更爲安全的keychain了。keychain裏保存的信息不會因App被刪除而丟失，在用戶重新安裝App後依然有效，數據還在。

使用蘋果官方發佈的KeychainItemWrapper或者SFHFKeychainUtils很方便，後來看到 iphone使用keychain來存取用戶名和密碼 一文，覺得對了解keychain有很大的幫助，於是ARC控也嘗試了一把。

需要導入Security.framework 

@implementation WQKeyChain
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
        (__bridge_transfer id)kSecClassGenericPassword,(__bridge_transfer id)kSecClass,
        service, (__bridge_transfer id)kSecAttrService,
        service, (__bridge_transfer id)kSecAttrAccount,
        (__bridge_transfer id)kSecAttrAccessibleAfterFirstUnlock,(__bridge_transfer id)kSecAttrAccessible,
        nil];
}

+ (void)save:(NSString *)service data:(id)data {
    //Get search dictionary
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Delete old item before add new item
    SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
    //Add new object to search dictionary(Attention:the data format)
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge_transfer id)kSecValueData];
    //Add item to keychain with the search dictionary
    SecItemAdd((__bridge_retained CFDictionaryRef)keychainQuery, NULL);
}

+ (id)load:(NSString *)service {
    id ret = nil;
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Configure the search setting
    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge_transfer id)kSecReturnData];
    [keychainQuery setObject:(__bridge_transfer id)kSecMatchLimitOne forKey:(__bridge_transfer id)kSecMatchLimit];
    CFDataRef keyData = NULL;
    if (SecItemCopyMatching((__bridge_retained CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
        @try {
            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge_transfer NSData *)keyData];
        } @catch (NSException *e) {
            NSLog(@"Unarchive of %@ failed: %@", service, e);
        } @finally {
        }
    }
    return ret;
}

+ (void)delete:(NSString *)service {
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
}
@end

比如，保存密碼

@interface WQUserDataManager : NSObject

/**
 *	@brief	存儲密碼
 *
 *	@param 	password 	密碼內容
 */
+(void)savePassWord:(NSString *)password;

/**
 *	@brief	讀取密碼
 *
 *	@return	密碼內容
 */
+(id)readPassWord;

/**
 *	@brief	刪除密碼數據
 */
+(void)deletePassWord;

@end

#import "WQUserDataManager.h"

@implementation WQUserDataManager

static NSString * const KEY_IN_KEYCHAIN = @"com.wuqian.app.allinfo";
static NSString * const KEY_PASSWORD = @"com.wuqian.app.password";

+(void)savePassWord:(NSString *)password
{
    NSMutableDictionary *usernamepasswordKVPairs = [NSMutableDictionary dictionary];
    [usernamepasswordKVPairs setObject:password forKey:KEY_PASSWORD];
    [WQKeyChain save:KEY_IN_KEYCHAIN data:usernamepasswordKVPairs];
}

+(id)readPassWord
{
    NSMutableDictionary *usernamepasswordKVPair = (NSMutableDictionary *)[WQKeyChain load:KEY_IN_KEYCHAIN];
    return [usernamepasswordKVPair objectForKey:KEY_PASSWORD];
}

+(void)deletePassWord
{
    [WQKeyChain delete:KEY_IN_KEYCHAIN];
}
@end

實現一個簡單的界面，把設定的密碼存起來，然後立即讀取顯示出來看看效果

-(IBAction)btnAciton:(id)sender
{
    [WQUserDataManager savePassWord:self.textfield.text];
    self.label.text = [WQUserDataManager readPassWord];
}

達到了預期的效果。