2016-12-29 16:18:35 +01:00

127 lines
4.2 KiB
Objective-C

//
// NSDataAESCipher.m
// MJ-iOS-Toolkit
//
// Created by Joan Martin on 09/05/16.
// Copyright © 2016 Mobile Jazz. All rights reserved.
//
#import "NSDataAESCipher.h"
#import "NSData+SHA.h"
#import <CommonCrypto/CommonCryptor.h>
NSString * NSDataAESCipherErrorDomain = @"com.mobilejazz.NSDataAESCipher";
NSInteger const NSDataAESCipherUndefinedErrorCode = 0;
NSInteger const NSDataAESCipherParamErrorCode = kCCParamError;
NSInteger const NSDataAESCipherBufferTooSmallErrorCode = kCCBufferTooSmall;
NSInteger const NSDataAESCipherMemoryFailureErrorCode = kCCMemoryFailure;
NSInteger const NSDataAESCipherAlignmentErrorCode = kCCAlignmentError;
NSInteger const NSDataAESCipherDecodeErrorCode = kCCDecodeError;
NSInteger const NSDataAESCipherCUnimplementedErrorCode = kCCUnimplemented;
@implementation NSDataAESCipher
+ (NSData*)cipherWithkey:(NSData*)key
value:(NSData*)value
iv:(NSData*)iv
operation:(MJCCOperation)operation
options:(MJCCOption)options
output:(NSMutableData*)output
error:(NSError**)error
{
if (kCCKeySizeAES256 != key.length)
{
// SHA256 the key unless it's already 256 bits.
key = [key sha_SHA256];
}
NSUInteger len = value.length;
NSUInteger capacity = (NSUInteger)(len / kCCBlockSizeAES128 + 1) * kCCBlockSizeAES128;
NSMutableData *data;
if (nil == output)
{
data = [NSMutableData dataWithLength:capacity];
}
else
{
data = output;
if (data.length < capacity)
{
[data setLength:capacity];
}
}
if (iv && kCCBlockSizeAES128 != iv.length)
{
// SHA1 the iv if provided.
iv = [iv sha_SHA1];
}
else
{
iv = [NSMutableData dataWithLength:kCCBlockSizeAES128];
}
const void *_iv = iv.bytes;
size_t dataOutMoved;
CCCryptorStatus ccStatus = CCCrypt(operation,
kCCAlgorithmAES128,
options,
(const char*)key.bytes,
key.length,
_iv,
(const void *)value.bytes,
[value length],
(void *)data.mutableBytes,
capacity,
&dataOutMoved
);
if (dataOutMoved < data.length)
{
[data setLength:dataOutMoved];
}
switch (ccStatus)
{
case kCCSuccess:
return data;
break;
case kCCParamError:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherParamErrorCode userInfo:nil];
break;
case kCCBufferTooSmall:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherBufferTooSmallErrorCode userInfo:nil];
break;
case kCCMemoryFailure:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherMemoryFailureErrorCode userInfo:nil];
break;
case kCCAlignmentError:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherAlignmentErrorCode userInfo:nil];
break;
case kCCDecodeError:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherDecodeErrorCode userInfo:nil];
break;
case kCCUnimplemented:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherCUnimplementedErrorCode userInfo:nil];
break;
default:
if (error)
*error = [NSError errorWithDomain:NSDataAESCipherErrorDomain code:NSDataAESCipherUndefinedErrorCode userInfo:nil];
break;
}
return nil;
}
@end