iphone cbc encryption returning null
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13-12-2019 - |
Question
I have the following code inside the NSData+AES256 class. I am trying AES CBC encryption to a NSString with the following code. I have a key and a iv. But getting null in result. Can not find out what's wrong. This is what I tried-
NSString *initV= @"somekey*********";
NSData *input= [initV dataUsingEncoding:NSUTF8StringEncoding];
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCModeCBC,
keyPtr, kCCKeySizeAES256,
[input bytes] /* initialization vector (optional) */,
[self bytes], dataLength, /* input */
buffer, bufferSize, /* output */
&numBytesEncrypted);
Solution
This is the code that worked for me finally-
-(NSData *)AES256EncryptWithKey:(NSString *)key {
NSUInteger dataLength = [self length];
NSData *keyGiven= [key dataUsingEncoding:NSUTF8StringEncoding];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
NSString *initV= @"***************";
NSData *input= [initV dataUsingEncoding:NSUTF8StringEncoding];
size_t numBytesEncrypted = 0;
CCCryptorRef ccRef;
CCCryptorCreate(kCCEncrypt, kCCAlgorithmAES128, 0, (const void *)[keyGiven bytes], kCCKeySizeAES256, (const void *)[input bytes], &ccRef);
CCCryptorStatus cryptStatus = CCCryptorUpdate(ccRef, [self bytes], dataLength, buffer, bufferSize, &numBytesEncrypted);
CCCryptorRelease(ccRef);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer); //free the buffer;
return nil;
}
I am converting an NSString to NSData and passing it for encryption. The NSString must be of 16 characters. If it is of less than 16 characters I make it 16 by appending spaces.
I don't know if this is going to help anybody. But I just thought I should share. Thanks.
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