Well im trying to encrypt an string in objective c extending NSData with this method:
@implementation NSData (AES128) (NSData *)AES128Encrypt { char keyPtr[kCCKeySizeAES128] = {'\xe1','\xaa','\x9c','\x61','\x46','\x74','\x44','\x56','\xf0','\xe5','\x47','\x46','\x86','\xdc','\x95','\x77'};
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyPtr,kCCKeySizeAES128,NULL /* initialization vector (optional) /,[self bytes], dataLength, / input /buffer, bufferSize, / output */ &numBytesEncrypted); if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted]; }
free(buffer); //free the buffer; return nil; }
(NSData *)AES128Decrypt { char keyPtr[kCCKeySizeAES128] = {'\xe1','\xaa','\x9c','\x61','\x46','\x74','\x44','\x56','\xf0','\xe5','\x47','\x46','\x86','\xdc','\x95','\x77'};
NSUInteger dataLength = [self length];
//See the doc: For block ciphers, the output size will always be less than or //equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus=CCCrypt(kCCDecrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyPtr, kCCKeySizeAES128,NULL /* initialization vector (optional) /,[self bytes], dataLength, / input /buffer, bufferSize, / output */&numBytesDecrypted);
if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted]; }
free(buffer); //free the buffer; return nil; }
@end
then i call it here:
NSString *strData = @"My string"; NSData *objNSData = [NSData dataWithData:[strData dataUsingEncoding: NSUTF8StringEncoding]];
NSLog(@"encrypted: %@",[objNSData description]);
If I just use it in objective c, it works fine. But when i try to send it to a java server it doesn't work.
My cipher data seems like this:
86fcf0fa9e3dff93dc8918ffd02ee203 12de0bf8c8ba300456293c4240296c0d
and if I try to cipher it in java using also AES with the same key, i get this:
86fcf0fa9e3dff93dc8918ffd02ee203 8388f173da143c6aeeb90e554259c83c
its weird because the first half its the same.
Someone knows why this can be happening? thanks.
