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.
