77 lines
2.5 KiB
Objective-C
77 lines
2.5 KiB
Objective-C
/*
|
|
* JBoss, Home of Professional Open Source.
|
|
* Copyright Red Hat, Inc., and individual contributors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#import "AGPBKDF2.h"
|
|
#import "AGRandomGenerator.h"
|
|
|
|
#import <CommonCrypto/CommonCryptor.h>
|
|
#import <CommonCrypto/CommonKeyDerivation.h>
|
|
|
|
const NSUInteger AGPBKDF2Iterations = 20000;
|
|
const NSUInteger AGPBKDF2MinimumIterations = 10000;
|
|
const NSUInteger AGPBKDF2DerivedKeyLength = 32;
|
|
const NSUInteger AGPBKDF2MinimumSaltLength = 16;
|
|
|
|
@implementation AGPBKDF2 {
|
|
NSData *_salt;
|
|
}
|
|
|
|
- (NSData *)deriveKey:(NSString *)password {
|
|
return [self deriveKey:password salt:[AGRandomGenerator randomBytes]];
|
|
}
|
|
|
|
- (NSData *)deriveKey:(NSString *)password salt:(NSData *)salt {
|
|
return [self deriveKey:password salt:salt iterations:AGPBKDF2Iterations];
|
|
}
|
|
|
|
- (NSData *)deriveKey:(NSString *)password salt:(NSData *)salt iterations:(NSUInteger)iterations {
|
|
NSParameterAssert(password != nil);
|
|
NSParameterAssert(salt != nil && [salt length] >= AGPBKDF2MinimumSaltLength);
|
|
NSParameterAssert(iterations >= AGPBKDF2MinimumIterations);
|
|
|
|
_salt = salt;
|
|
|
|
NSMutableData *key = [NSMutableData dataWithLength:AGPBKDF2DerivedKeyLength];
|
|
|
|
int result = CCKeyDerivationPBKDF(kCCPBKDF2,
|
|
[password UTF8String],
|
|
[password length],
|
|
[salt bytes],
|
|
[salt length],
|
|
kCCPRFHmacAlgSHA1,
|
|
(uint)iterations,
|
|
[key mutableBytes],
|
|
AGPBKDF2DerivedKeyLength);
|
|
if (result == kCCParamError) {
|
|
return nil;
|
|
}
|
|
|
|
return key;
|
|
}
|
|
|
|
- (BOOL)validate:(NSString *)password encryptedPassword:(NSData *)encryptedPassword salt:(NSData *)salt {
|
|
NSData *attempt = [self deriveKey:password salt:salt];
|
|
|
|
return [encryptedPassword isEqual:attempt];
|
|
}
|
|
|
|
- (NSData *)salt {
|
|
return _salt;
|
|
}
|
|
|
|
@end
|