I want to create AES 128 using CFB encryption without registration in lens c

Question

I want to create AES 128 using CFB encryption without padding, i.e.

Example 1: secret data: "HELLO WORLD" key: 10 A5 88 69 D7 4B E5 A3 74 CF 86 7C FB 47 38 59 IV: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Clear text (unencrypted) : 48 45 4C 4C 4F 20 57 4F 52 4C 44 encrypted text: 25 60 52 25 0B 90 06 AF 1C E6 2B

But I get Encrypted Hex String == ie no string. My encryption was successful, but without encrypted data. Any suggestion?

here is the code:

NSData *commandData = [@"HELLO WORLD" dataUsingEncoding:NSASCIIStringEncoding]; calling Method [commandData AES128OperationWithCreate:kCCEncrypt key:@"10a58869d74be5a374cf867cfb473859" iv:@"00000000000000000000000000000000"] @implementation NSData (AES) - (NSData *)AES128OperationWithCreate:(CCOperation)operation key:(NSString *)key iv:(NSString *)iv{ char ivPtr[kCCBlockSizeAES128 + 1]; bzero(ivPtr, sizeof(ivPtr)); if (iv) { [iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding]; } char keyPtr[kCCKeySizeAES128 + 1]; bzero(keyPtr, sizeof(keyPtr)); [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; CCCryptorRef cryptor = NULL; CCCryptorStatus result = CCCryptorCreateWithMode(operation, kCCModeCFB, kCCAlgorithmAES128, ccNoPadding, ivPtr, keyPtr, kCCKeySizeAES128, NULL, 0, 0, 0, &cryptor); if (result != kCCSuccess) { NSLog(@"encryptAESCTRData: createWithMode error: %@", @(result)); result = CCCryptorRelease(cryptor); return nil; } size_t bufferLength = CCCryptorGetOutputLength(cryptor, [self length], true); NSMutableData *buffer = [NSMutableData dataWithLength:bufferLength]; NSMutableData *cipherData = [NSMutableData data]; size_t outLength; result = CCCryptorUpdate(cryptor, [self bytes], [self length], [buffer mutableBytes], [buffer length], &outLength); // FIXME: Release cryptor and return error if (result != kCCSuccess) { NSLog(@"encryptAESCTRData: CCCryptorUpdate error: %@", @(result)); result = CCCryptorRelease(cryptor); return nil; } result = CCCryptorFinal(cryptor, [buffer mutableBytes], [buffer length], &outLength); // FIXME: Release cryptor and return error if (result != kCCSuccess) { NSLog(@"encryptAESCTRData: CCCryptorFinal error: %@", @(result)); result = CCCryptorRelease(cryptor); return nil; } [cipherData appendBytes:buffer.bytes length:outLength]; return cipherData; //return [NSData dataWithBytesNoCopy:(__bridge void * _Nonnull)(buffer) length:outLength freeWhenDone:YES]; } 

Answer 1

I decided to use 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]; }