C# 返回空字符串的解密

我正在尝试使用

openssl\u decrypt

解密字符串。出于某种原因，无论我尝试了什么，它总是返回空的。下面是我正在使用的一个小函数非生产代码

PHP代码

public function Decrypt($string)
    {
        $password = "somepassword";
        $method = "aes-256-cbc";
        $hashPassword = hash('sha256', $password);
        $iv = chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0);

        return openssl_decrypt(base64_decode($string), $method, $hashPassword, OPENSSL_RAW_DATA, $iv);

    }

 private static readonly byte[] FIELDS_KEY = SHA256.Create().ComputeHash(Encoding.ASCII.GetBytes("PASSWORDHERE"));
 private static readonly byte[] FIELDS_IV = new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };


public static string EncryptString(string plainText)
        {
            // Instantiate a new Aes object to perform string symmetric encryption
            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.CBC;

            // Set key and IV
            byte[] aesKey = new byte[32];
            Array.Copy(FIELDS_KEY, 0, aesKey, 0, 32);
            encryptor.Key = aesKey;
            encryptor.IV = FIELDS_IV;

            // Instantiate a new MemoryStream object to contain the encrypted bytes
            MemoryStream memoryStream = new MemoryStream();

            // Instantiate a new encryptor from our Aes object
            ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();

            // Instantiate a new CryptoStream object to process the data and write it to the 
            // memory stream
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

            // Convert the plainText string into a byte array
            byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);

            // Encrypt the input plaintext string
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);

            // Complete the encryption process
            cryptoStream.FlushFinalBlock();

            // Convert the encrypted data from a MemoryStream to a byte array
            byte[] cipherBytes = memoryStream.ToArray();

            // Close both the MemoryStream and the CryptoStream
            memoryStream.Close();
            cryptoStream.Close();

            // Convert the encrypted byte array to a base64 encoded string
            string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);

            // Return the encrypted data as a string
            return cipherText;
        }

另一方面，加密发生在

c#

端，使用

Xamarin

进行web调用。下面是我目前使用的加密函数

C#代码

public function Decrypt($string)
    {
        $password = "somepassword";
        $method = "aes-256-cbc";
        $hashPassword = hash('sha256', $password);
        $iv = chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0);

        return openssl_decrypt(base64_decode($string), $method, $hashPassword, OPENSSL_RAW_DATA, $iv);

    }

 private static readonly byte[] FIELDS_KEY = SHA256.Create().ComputeHash(Encoding.ASCII.GetBytes("PASSWORDHERE"));
 private static readonly byte[] FIELDS_IV = new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };


public static string EncryptString(string plainText)
        {
            // Instantiate a new Aes object to perform string symmetric encryption
            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.CBC;

            // Set key and IV
            byte[] aesKey = new byte[32];
            Array.Copy(FIELDS_KEY, 0, aesKey, 0, 32);
            encryptor.Key = aesKey;
            encryptor.IV = FIELDS_IV;

            // Instantiate a new MemoryStream object to contain the encrypted bytes
            MemoryStream memoryStream = new MemoryStream();

            // Instantiate a new encryptor from our Aes object
            ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();

            // Instantiate a new CryptoStream object to process the data and write it to the 
            // memory stream
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

            // Convert the plainText string into a byte array
            byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);

            // Encrypt the input plaintext string
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);

            // Complete the encryption process
            cryptoStream.FlushFinalBlock();

            // Convert the encrypted data from a MemoryStream to a byte array
            byte[] cipherBytes = memoryStream.ToArray();

            // Close both the MemoryStream and the CryptoStream
            memoryStream.Close();
            cryptoStream.Close();

            // Convert the encrypted byte array to a base64 encoded string
            string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);

            // Return the encrypted data as a string
            return cipherText;
        }

老实说，我真的不确定我在这里遗漏了什么，当我检查输入的密码、检查哈希密码和IV时，似乎都是从

c#

函数的加密端进行检查。

方法在当前PHP代码中以十六进制字符串的形式返回结果。但是，-方法要求密钥作为二进制数据，因此需要进行转换，例如使用：

$hashPassword = hex2bin(hash('sha256', $password));  

或者，可以将-method的第三个参数（

raw_output

）设置为

TRUE

。这将直接以二进制数据的形式返回结果：

$hashPassword = hash('sha256', $password, $raw_output = true);

---

陛下为什么要使用哈希密码解密？加密没有使用散列密码，是吗？在当前PHP代码中，-方法以十六进制字符串的形式返回结果。由于需要二进制数据，因此必须先用

hex2bin

转换此字符串。或者，可以将

散列

-方法中的第三个参数

$raw\u output

设置为

TRUE

，以便直接将结果作为二进制数据返回。无法再现问题。代码

https://pastebin.com/JFCHqtLi

运行，例如在

https://repl.it/languages/php_cli

Holy smokes@Topaco真管用<代码>$hashPassword=hash（'sha256'，$password，$raw\u output=true）是

$raw\u output=true

完成的；我刚才说的是

true

！非常感谢，如果你能给我一个答案，我很乐意接受，再次感谢！记住@Topaco，评论可能会消失，但答案永远不会消失。我们喜欢这里的答案，暗示，暗示；）