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#import "KeychainHelper.h"
NS_ASSUME_NONNULL_BEGIN
@implementation KeychainHelper
+ (NSString *)authenticationKey {
CFDictionaryRef query = (__bridge CFDictionaryRef)@{
(__bridge NSString *)kSecClass: (__bridge NSString *)kSecClassGenericPassword,
(__bridge NSString *)kSecAttrService: kKeychainService,
(__bridge NSString *)kSecAttrAccount: kAuthenticationKeyKeychainKey,
(__bridge NSString *)kSecReturnData: @YES,
(__bridge NSString *)kSecMatchLimit: (__bridge NSString *)kSecMatchLimitOne
};
CFTypeRef result = NULL;
OSStatus status = SecItemCopyMatching(query, &result);
if (status == errSecSuccess && result != NULL) {
NSData *keyData = (__bridge NSData *)result;
NSString *authenticationKey = [[[NSString alloc] initWithData:keyData
encoding:NSUTF8StringEncoding] autorelease];
CFRelease(result);
return authenticationKey;
}
return nil;
}
+ (OSStatus)setAuthenticationKey:(NSString *)authenticationKey {
NSData *passwordData = [authenticationKey dataUsingEncoding:NSUTF8StringEncoding];
// First try to update existing item
CFDictionaryRef query = (__bridge CFDictionaryRef)@{
(__bridge NSString *)kSecClass: (__bridge NSString *)kSecClassGenericPassword,
(__bridge NSString *)kSecAttrService: kKeychainService,
(__bridge NSString *)kSecAttrAccount: kAuthenticationKeyKeychainKey
};
CFDictionaryRef attributesToUpdate = (__bridge CFDictionaryRef)@{
(__bridge NSString *)kSecValueData: passwordData
};
OSStatus status = SecItemUpdate(query, attributesToUpdate);
if (status == errSecItemNotFound) {
// Item doesn't exist, create new one
CFDictionaryRef attributes = (__bridge CFDictionaryRef)@{
(__bridge NSString *)kSecClass: (__bridge NSString *)kSecClassGenericPassword,
(__bridge NSString *)kSecAttrService: kKeychainService,
(__bridge NSString *)kSecAttrAccount: kAuthenticationKeyKeychainKey,
(__bridge NSString *)kSecValueData: passwordData,
(__bridge NSString *)kSecAttrAccessible: (__bridge NSString *)kSecAttrAccessibleWhenUnlockedThisDeviceOnly
};
status = SecItemAdd(attributes, NULL);
}
return status;
}
+ (OSStatus)deleteAuthenticationKey {
CFDictionaryRef query = (__bridge CFDictionaryRef)@{
(__bridge NSString *)kSecClass: (__bridge NSString *)kSecClassGenericPassword,
(__bridge NSString *)kSecAttrService: kKeychainService,
(__bridge NSString *)kSecAttrAccount: kAuthenticationKeyKeychainKey
};
OSStatus status = SecItemDelete(query);
return status;
}
@end
NS_ASSUME_NONNULL_END
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