加密AES / CBC / PKCS7Padding

Question

帮我加密AES/CBC/PKCS7Padding？ 以下是我解密AES/CBC/PKCS7的代码。 它正在工作，但是当我加密一些字符串并从我自己解密它是错误的。下面我添加代码来加密和解密AES / CBC / PKCS7Padding。

- (NSData *)AES256Encrypt:(id)key
{
    NSString *iv = @"FEDCBA9876543210";
    NSData *keyPtr = [key copy];
    size_t dataLength = [self length];
    NSData *ivPtr = [iv dataUsingEncoding:NSUTF8StringEncoding];
    //NSData *encrypted = [self subdataWithRange:NSMakeRange(0, [self length])];

    //size_t bufferSize           = dataLength + kCCBlockSizeAES128;
    //void* buffer                = malloc(bufferSize);
    NSMutableData *ret = [NSMutableData dataWithLength:dataLength + kCCBlockSizeAES128];
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                      [keyPtr bytes], kCCKeySizeAES256,
                                      [ivPtr bytes],
                                      [self bytes], dataLength,
                                      [ret mutableBytes], [ret length],
                                      &numBytesDecrypted);

    NSLog(@"Err : %d",cryptStatus);
    NSLog(@"DataLength : %d, num : %d", (int)dataLength, (int)numBytesDecrypted);
    if (cryptStatus == kCCSuccess)
        return ret;

    return nil;
}

- (NSData *)AES256Decrypt:(id)key
{
    NSData *keyPtr = [key copy];
    size_t dataLength = [self length] - kCCBlockSizeAES128;
    NSData *ivPtr = [self subdataWithRange:NSMakeRange(0, kCCBlockSizeAES128)];
    NSData *encrypted = [self subdataWithRange:NSMakeRange(kCCBlockSizeAES128, dataLength)];

    NSMutableData *ret = [NSMutableData dataWithLength:dataLength + kCCBlockSizeAES128];
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                      [keyPtr bytes], kCCKeySizeAES256,
                                      [ivPtr bytes], /* initialization vector (optional) */
                                      [encrypted bytes], dataLength, /* input */
                                      [ret mutableBytes], [ret length], /* output */
                                      &numBytesDecrypted);

    NSLog(@"Err : %d",cryptStatus);
    NSLog(@"DataLength : %d, num : %d", (int)dataLength, (int)numBytesDecrypted);
    if (cryptStatus == kCCSuccess)
        return ret;

    return nil;
}

我的字符串："abcd"

从Python加密= "fl6h8iBeXGO03ZIKzpDMwMaNc7Y1PsRc/s6XJKPCxKNyrYResv3oO1/bkbofmY7y8e2wOe2sIpk="