保存iOS密码(简单使用keychain)
2023-05-22
在iOS中保存密码，如果你想追求安全，那么使用苹果自己的Keychain。 毫无疑问，Services是最好的选择。若要使用Keychainn系统 Services，首先要添加Security.framework。
Keychain Services为存储和更新keychainninn带来了一系列api。 item：
SecItemAdd（添加）
SecItemUpdate（更新）
SecItemCopyMatching（查找）
SecItemDelete（删掉）
直接使用这些方法有点麻烦，需要对对象进行包装。我写了一个典型的例子，只是用来存储账户密码，以实现记忆密码的功能。
以下是一些代码，完整的项目下载：https://github.com/tenric/KeyChainDemo
MyKeyChainHelper.h
#import
@interface MyKeyChainHelper : NSObject
(void) saveUserName:(NSString*)userName
userNameService:(NSString*)userNameService
psaaword:(NSString*)pwd
psaawordService:(NSString*)pwdService;
(void) deleteWithUserNameService:(NSString*)userNameService
psaawordService:(NSString*)pwdService;
(NSString*) getUserNameWithService:(NSString*)userNameService;
(NSString*) getPasswordWithService:(NSString*)pwdService;
@end
MyKeyChainHelper.m
#import "MyKeyChainHelper.h"
@implementation MyKeyChainHelper
(NSMutableDictionary *)getKeyChainQuery:(NSString *)service {
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
(id)kSecClassGenericPassword,(id)kSecClass,
service, (id)kSecAttrService,
service, (id)kSecAttrAccount,
(id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
nil];
}
(void) saveUserName:(NSString*)userName
userNameService:(NSString*)userNameService
psaaword:(NSString*)pwd
psaawordService:(NSString*)pwdService
{
NSMutableDictionary *keychainQuery = [self getKeyChainQuery:userNameService];
SecItemDelete((CFDictionaryRef)keychainQuery);
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:userName] forKey:(id)kSecValueData];
SecItemAdd((CFDictionaryRef)keychainQuery, NULL);
keychainQuery = [self getKeyChainQuery:pwdService];
SecItemDelete((CFDictionaryRef)keychainQuery);
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:pwd] forKey:(id)kSecValueData];
SecItemAdd((CFDictionaryRef)keychainQuery, NULL);
}
(void) deleteWithUserNameService:(NSString*)userNameService
psaawordService:(NSString*)pwdService
{
NSMutableDictionary *keychainQuery = [self getKeyChainQuery:userNameService];
SecItemDelete((CFDictionaryRef)keychainQuery);
keychainQuery = [self getKeyChainQuery:pwdService];
SecItemDelete((CFDictionaryRef)keychainQuery);
}
(NSString*) getUserNameWithService:(NSString*)userNameService
{
NSString* ret = nil;
NSMutableDictionary *keychainQuery = [self getKeyChainQuery:userNameService];
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
[keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr)
{
@try
{
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(NSData *)keyData];
}
@catch (NSException *e)
{
NSLog(@"Unarchive of %@ failed: %@", userNameService, e);
}
@finally
{
}
}
if (keyData)
CFRelease(keyData);
return ret;
}
(NSString*) getPasswordWithService:(NSString*)pwdService
{
NSString* ret = nil;
NSMutableDictionary *keychainQuery = [self getKeyChainQuery:pwdService];
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
[keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr)
{
@try
{
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(NSData *)keyData];
}
@catch (NSException *e)
{
NSLog(@"Unarchive of %@ failed: %@", pwdService, e);
}
@finally
{
}
}
if (keyData)
CFRelease(keyData);
return ret;
}
@end
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