I Want to Create AES 128 using CFB Encryption with No Padding in objective c

Question

I Want to Create AES 128 using CFB Encryption with No Padding i.e.

Sample 1: secret data is \"HELLO WORLD\" key:10 A5 88 69 D7 4B E5 A3 74 CF 8

Answer 1

I have solved the by using this method

- (NSData *)AES128OperationWithEncriptionMode:(CCOperation)operation key:(NSData *)key iv:(NSData *)iv {


    CCCryptorRef cryptor = NULL;
    // 1. Create a cryptographic context.
    CCCryptorStatus status = CCCryptorCreateWithMode(operation, kCCModeCFB, kCCAlgorithmAES, ccNoPadding, [iv bytes], [key bytes], [key length], NULL, 0, 0, kCCModeOptionCTR_BE, &cryptor);

    NSAssert(status == kCCSuccess, @"Failed to create a cryptographic context.");

    NSMutableData *retData = [NSMutableData new];

    // 2. Encrypt or decrypt data.
    NSMutableData *buffer = [NSMutableData data];
    [buffer setLength:CCCryptorGetOutputLength(cryptor, [self length], true)]; // We'll reuse the buffer in -finish

    size_t dataOutMoved;
    status = CCCryptorUpdate(cryptor, self.bytes, self.length, buffer.mutableBytes, buffer.length, &dataOutMoved);
    NSAssert(status == kCCSuccess, @"Failed to encrypt or decrypt data");
    [retData appendData:[buffer subdataWithRange:NSMakeRange(0, dataOutMoved)]];

    // 3. Finish the encrypt or decrypt operation.
    status = CCCryptorFinal(cryptor, buffer.mutableBytes, buffer.length, &dataOutMoved);
    NSAssert(status == kCCSuccess, @"Failed to finish the encrypt or decrypt operation");
    [retData appendData:[buffer subdataWithRange:NSMakeRange(0, dataOutMoved)]];
    CCCryptorRelease(cryptor);

    return [retData copy];
}