iphone加密不工作 [英] iphone encryption not working

问题描述

我已经实现了这个加密/解密，执行没有错误，但是我无法解密数据，不知道数据是否加密， pre> - （NSData *）AES256EncryptWithKey :( NSString *）键{

char keyPtr [kCCKeySizeAES256 + 1];
bzero（keyPtr，sizeof（keyPtr））;


[key getCString：keyPtr maxLength：sizeof（keyPtr）encoding：NSUTF8StringEncoding];


NSUInteger dataLength = [strData length];
data = [[NSData alloc] init];
data = [strData dataUsingEncoding：NSUTF8StringEncoding];


size_t bufferSize = dataLength + kCCBlockSizeAES128;
void * pribuffer = malloc（bufferSize）;

size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt（kCCEncrypt，kCCAlgorithmAES128，kCCOptionPKCS7Padding，
keyPtr，kCCKeySizeAES256，
NULL / *初始化向量（可选）* /，
[数据字节]，dataLength， * input * /
[data bytes]，bufferSize，/ * output * /
& numBytesEncrypted）;
if（cryptStatus == kCCSuccess）{
return [NSData dataWithBytesNoCopy：data length：numBytesEncrypted];
}}


解密是：

$ b $ （NSData *）key andForData：（NSData *）objDataObject {
char keyPtr [kCCKeySizeAES256 + 1];（$）$ {code>
bzero（keyPtr，sizeof（keyPtr））;
[key getCString：keyPtr maxLength：sizeof（keyPtr）encoding：NSUTF8StringEncoding];

NSUInteger dataLength = [objDataObject length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void * buffer = malloc（bufferSize）;

size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt（kCCDecrypt，kCCAlgorithmAES128，kCCOptionPKCS7Padding，
keyPtr，kCCKeySizeAES256，
NULL，
[objDataObject bytes]，dataLength，
[objDataObject bytes]，bufferSize ，
& numBytesDecrypted）;

if（cryptStatus == kCCSuccess）{
return [NSData dataWithBytesNoCopy：objDataObject length：numBytesDecrypted];
}

}

我这样调用上面的方法：

  CryptoClass * obj = [CryptoClass new]; 
 NSData * objData = [obj AES256EncryptWithKey：@hell]; 
 
 NSData * val = [obj AES256DecryptWithKey：@hellandForData：objData]; 
 
 NSLog（@解密字符串为：％@ AND LENGTH IS％d，[val description]，[val length]）; 
  

解密似乎并没有发生，加密 - 我不确定，请帮助我

解决方案

我已经自己学习了，

可以通过ccats的完全实现是：

http：/ /pastie.org/966473

感谢所有帮助的人。

I have this encryption/decryption implemented and executes with no error, but i am unable to decrypt the data and im not sure whether the data is encrypted, kindly help.

- (NSData *)AES256EncryptWithKey:(NSString *)key {

char keyPtr[kCCKeySizeAES256+1]; 
bzero(keyPtr, sizeof(keyPtr));


[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];


NSUInteger dataLength = [strData length];
data = [[NSData alloc] init];
data = [strData dataUsingEncoding:NSUTF8StringEncoding];


size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *pribuffer = malloc(bufferSize);

size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                      keyPtr, kCCKeySizeAES256,
                                      NULL /* initialization vector (optional) */,
                                      [data bytes], dataLength, /* input */
                                      [data bytes], bufferSize, /* output */
                                      &numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
    return [NSData dataWithBytesNoCopy:data length:numBytesEncrypted];
}}

The decryption is :

-(NSData *)AES256DecryptWithKey:(NSString *)key andForData:(NSData *)objDataObject {
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr)); 
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

NSUInteger dataLength = [objDataObject length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);

size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                      keyPtr, kCCKeySizeAES256,
                                      NULL,
                                      [objDataObject bytes], dataLength,
                                      [objDataObject bytes], bufferSize,
                                      &numBytesDecrypted);

if (cryptStatus == kCCSuccess) {
    return [NSData dataWithBytesNoCopy:objDataObject length:numBytesDecrypted];
}

}

i call the above methods like this:

CryptoClass *obj = [CryptoClass new];
NSData *objData = [obj AES256EncryptWithKey:@"hell"];

NSData *val = [obj AES256DecryptWithKey:@"hell" andForData:objData ];

NSLog(@"decrypted string is : %@ AND LENGTH IS %d",[val description],[val length]);

Decryption doesnt seem to happen at all and the encryption - i am not sure about it, kindly help me here.

解决方案

I have learnt it by myself,

a complete implementation which can bye-pass ccats is:

http://pastie.org/966473

Thanks to all who helped.

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