objective-c - 无法解密AES密文

编辑2
这个问题已经解决了，答案是关于my other question的，并且感谢Hot Licks。

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Edit1：我确定我的密文和密钥是正确的。因为我的同事使用C ++对其进行了解密并且没有问题，顺便说一下，它是ECB模式。

我在这个问题上工作了一周，但仍然无法解决。我真的不知道该怎么办。

我正在开发可可应用程序，我的服务器返回了一个用AES加密的密文。

我的密文是：

NSString *aesString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

我的关键是：

NSString *key = @"810B16E3541EF7A4";

我使用nicerobot'answer解密我的密文，并尝试其他许多方法。我希望有人可以告诉我下一步该怎么做。

最佳答案

使用以下代码将加密的字符串文本转换为NSData对象。

NSData* stringData = [encryptedStringText dataUsingEncoding:NSUTF8StringEncoding];

为NSData创建以下所示的类别，然后将其用于AES解密NSData内容。

NSData* unencryptedData = [stringData AES256DecryptWithKey:keyText];

将您的NSData对象转换为NSString。

NSString* unencryptedStringText = [NSString stringWithUTF8String:[unencryptedData bytes]];

#pragma mark -
#pragma mark NSData Encryption Category

// ---------------------------------------------------------
// NSData Category to add Encryption
// ---------------------------------------------------------

@interface NSData (NSDataAESEncryption)
- (NSData *)AES256EncryptWithKey:(NSString *)key;
- (NSData *)AES256DecryptWithKey:(NSString *)key;
@end



@implementation NSData (NSDataAESEncryption)

- (NSData *)AES256EncryptWithKey:(NSString *)key {

    char keyPtr[kCCKeySizeAES256+1];

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSInteger dataLength = [self length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);

    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                          keyPtr, kCCKeySizeAES256,
                                          NULL ,
                                          [self bytes], dataLength,
                                          buffer, bufferSize,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
    }

    free(buffer);

    return nil;
}

- (NSData *)AES256DecryptWithKey:(NSString *)key {

    char keyPtr[kCCKeySizeAES256+1];

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSInteger dataLength = [self length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);

    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                          keyPtr, kCCKeySizeAES256,
                                          NULL ,
                                          [self bytes], dataLength,
                                          buffer, bufferSize,
                                          &numBytesDecrypted);

    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
    }

    free(buffer);

    return nil;
}


@end

关于objective-c - 无法解密AES密文，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11847605/