Metro WinRT应用程序中的AesManaged Decryption [英] AesManaged Decryption in Metro WinRT application

问题描述

我有一些文本，由C＃的AesManaged加密，必须在WinRT Metro应用程序中解密。

加密功能看起来像这样：

$ b我不能改变加密代码，因为代码有其他依赖关系。 $ b

  //注意：编辑可能真实的密码和盐：
 Guid password = Guid.Parse（AAAAAAAAA-AAAAAAAAAAAAA）; 
 Guid salt = Guid.Parse（AAAAAAAAA-BBBB-BBBB-BBBB-AAAAAAAAAAAA）; 
 
 string EncryptedValue（string data）
 {
 byte [] passwordBytes = password.ToByteArray（）; 
 byte [] saltBytes = salt.ToByteArray（）; 
 
 byte [] bKey = new byte [16]; 
 for（int i = 0; i <16; i ++）
 {
 bKey [i] = passwordBytes [i] 
} 
 
 string encryptedData = String.Empty; 
 using（System.Security.Cryptography.AesManaged aesAlg = new System.Security.Cryptography.AesManaged（））
 {
 aesAlg.Key = bKey; 
 aesAlg.IV = saltBytes; 
 
 //创建解密器以执行流转换。 
 System.Security.Cryptography.ICryptoTransform encryptor = aesAlg.CreateEncryptor（aesAlg.Key，aesAlg.IV）; 
 
 //创建用于加密的流。 
 using（MemoryStream msEncrypt = new MemoryStream（））
 {
 using（System.Security.Cryptography.CryptoStream csEncrypt = new System.Security.Cryptography.CryptoStream（msEncrypt，encryptor，System.Security 。
 {
使用（StreamWriter swEncrypt = new StreamWriter（csEncrypt））
 {
 
 //将所有数据写入流。 
 swEncrypt.Write（data）; 
} 
 
 encryptedData = Convert.ToBase64String（msEncrypt.ToArray（））; 
} 
} 
} 
 
 return encryptedData; 
} 
  

示例数据：

  //解密值为：2029 
 var _id = EncryptedSettingsBase.Decrypt（ROSNJ1XnAozF7LC0wW8AOg ==）; 
  

我阅读了以下帖子：
http://social.msdn.microsoft.com/Forums/en-US/ winappswithcsharp / thread / 7cfcc576-1c2c-4a50-a546-09a45d3ff41f
看起来像同样的问题，但是我还没有得到他们的建议工作，我得到例外：数据错误（循环冗余校验）。 （Exception from HRESULT：0x80070017）'。

 内部类EncryptedSettingsBase 
 {
 public static string Decrypt string cipherText）
 {
 var passwordBytes =（new Guid（AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA））ToByteArray（）; 
 var salt =（new Guid（AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA））。ToString（）; 
 
 byte [] bKey = new byte [16]; 
 for（int i = 0; i <16; i ++）
 {
 bKey [i] = passwordBytes [i] 
} 
 
 IBuffer pwBuffer = CryptographicBuffer.CreateFromByteArray（bKey）; 
 IBuffer saltBuffer = CryptographicBuffer.ConvertStringToBinary（salt，BinaryStringEncoding.Utf16LE）; 
 IBuffer cipherBuffer = CryptographicBuffer.DecodeFromBase64String（cipherText）; 
 
 //为AES256算法导出密钥大小为32字节的密钥材料
 KeyDerivationAlgorithmProvider keyDerivationProvider = KeyDerivationAlgorithmProvider.OpenAlgorithm（PBKDF2_SHA1）; 
 //使用salt和1000次迭代
 KeyDerivationParameters pbkdf2Parms = KeyDerivationParameters.BuildForPbkdf2（saltBuffer，1000）; 
 
 //基于原始密钥和派生参数创建一个密钥
 CryptographicKey keyOriginal = keyDerivationProvider.CreateKey（pwBuffer）; 
 IBuffer keyMaterial = CryptographicEngine.DeriveKeyMaterial（keyOriginal，pbkdf2Parms，32）; 
 CryptographicKey derivedPwKey = keyDerivationProvider.CreateKey（pwBuffer）; 
 
 //派生用于加密的缓冲区salt from derived password key 
 IBuffer saltMaterial = CryptographicEngine.DeriveKeyMaterial（derivedPwKey，pbkdf2Parms，16）; 
 
 //显示键 - 因为KeyDerivationProvider在每次使用后总是被清除，它们非常相似，不幸的是
 string keyMaterialString = CryptographicBuffer.EncodeToBase64String（keyMaterial）; 
 string saltMaterialString = CryptographicBuffer.EncodeToBase64String（saltMaterial）; 
 
 SymmetricKeyAlgorithmProvider symProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm（AES_CBC_PKCS7）; 
 //从派生密码材料创建对称密钥
 CryptographicKey symmKey = symProvider.CreateSymmetricKey（keyMaterial）; 
 
 //使用对称密钥和派生盐材料加密数据缓冲区
 IBuffer resultBuffer = CryptographicEngine.Decrypt（symmKey，cipherBuffer，saltMaterial）; 
 string result = CryptographicBuffer.ConvertBinaryToString（BinaryStringEncoding.Utf16LE，resultBuffer）; 
 return result; 
} 
} 
  

我可能做一些蠢事，不能完全理解这个东西。任何人都知道我在哪里出错？

任何帮助都非常感激。

干杯，
Jon

解决方案

如果我可以更改所有依赖关系以正确加密，
$ b

此处帮助的代码： http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/2966549-make-equal-aesmanaged-snippet-as-in-silverlight-an

加密代码，C＃4.0端：

  string salt =AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA; 
 string password =AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA; 
 
 string EncryptedValue（string data）
 {
 byte [] saltBytes = System.Text.Encoding.UTF8.GetBytes（salt）; 
 
 string encryptedData = String.Empty; 
 using（System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged（））
 {
 var rfc = new System.Security.Cryptography.Rfc2898DeriveBytes（password，saltBytes ）; 
 
 aes.BlockSize = aes.LegalBlockSizes [0] .MaxSize; 
 aes.KeySize = aes.LegalKeySizes [0] .MaxSize; 
 aes.Key = rfc.GetBytes（32）; 
 rfc.Reset（）; 
 aes.IV = rfc.GetBytes（16）; 
 
 //创建解密器以执行流转换。 
 System.Security.Cryptography.ICryptoTransform encryptor = aes.CreateEncryptor（aes.Key，aes.IV）; 
 
 //创建用于加密的流。 
 using（MemoryStream msEncrypt = new MemoryStream（））
 {
 using（System.Security.Cryptography.CryptoStream csEncrypt = new System.Security.Cryptography.CryptoStream（msEncrypt，encryptor，System.Security 。
 {
 //使用（StreamWriter swEncrypt = new StreamWriter（csEncrypt））
 {
 //将所有数据写入流。 
 swEncrypt.Write（data）; 
} 
 
 encryptedData = Convert.ToBase64String（msEncrypt.ToArray（））; 
} 
} 
} 
 
 return encryptedData; 
} 
  

解密代码WinRT端：

$ b b

  protected string Decrypt（string encryptedData）
 {
 const string password =AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA; 
 const string salt =AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA; 
 
 IBuffer pwBuffer = CryptographicBuffer.ConvertStringToBinary（password，BinaryStringEncoding.Utf8）; 
 IBuffer saltBuffer = CryptographicBuffer.ConvertStringToBinary（salt，BinaryStringEncoding.Utf8）; 
 IBuffer cipherBuffer = CryptographicBuffer.DecodeFromBase64String（encryptedData）; 
 
 KeyDerivationAlgorithmProvider keyDerivationProvider = KeyDerivationAlgorithmProvider.OpenAlgorithm（PBKDF2_SHA1）; 
 
 KeyDerivationParameters pbkdf2Parms = KeyDerivationParameters.BuildForPbkdf2（saltBuffer，1000）; 
 
 CryptographicKey keyOriginal = keyDerivationProvider.CreateKey（pwBuffer）; 
 IBuffer keyMaterial = CryptographicEngine.DeriveKeyMaterial（keyOriginal，pbkdf2Parms，32）; 
 
 CryptographicKey derivedPwKey = keyDerivationProvider.CreateKey（pwBuffer）; 
 
 IBuffer saltMaterial = CryptographicEngine.DeriveKeyMaterial（derivedPwKey，pbkdf2Parms，16）; 
 
 SymmetricKeyAlgorithmProvider symProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm（AES_CBC_PKCS7）; 
 
 CryptographicKey symmKey = symProvider.CreateSymmetricKey（keyMaterial）; 
 
 IBuffer resultBuffer = CryptographicEngine.Decrypt（symmKey，cipherBuffer，saltMaterial）; 
 
 byte [] asd; 
 CryptographicBuffer.CopyToByteArray（resultBuffer，out asd）; 
 string result = CryptographicBuffer.ConvertBinaryToString（BinaryStringEncoding.Utf8，resultBuffer）; 
 return result; 
} 
  

I have some text, encrypted by C#'s AesManaged, which must be decrypted in a WinRT Metro application. I cannot change the Encryption code, as the code has other dependencies which cant be changed.

The encryption function looks like this:

// Note: Edited out possibly real password and salt:
Guid password = Guid.Parse("AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA");
Guid salt = Guid.Parse("AAAAAAAAA-BBBB-BBBB-BBBB-AAAAAAAAAAAA");

string EncryptedValue(string data)
{   
byte[] passwordBytes = password.ToByteArray();
byte[] saltBytes = salt.ToByteArray();

byte[] bKey = new byte[16];
for(int i = 0; i < 16; i++)
{
    bKey[i] = passwordBytes[i];
}

string encryptedData = String.Empty;
using (System.Security.Cryptography.AesManaged aesAlg = new System.Security.Cryptography.AesManaged())
{
    aesAlg.Key = bKey;
    aesAlg.IV = saltBytes;

    // Create a decrytor to perform the stream transform.
    System.Security.Cryptography.ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

    // Create the streams used for encryption.
    using (MemoryStream msEncrypt = new MemoryStream())
    {
        using (System.Security.Cryptography.CryptoStream csEncrypt = new System.Security.Cryptography.CryptoStream(msEncrypt, encryptor, System.Security.Cryptography.CryptoStreamMode.Write))
        {
            using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
            {

                //Write all data to the stream.
                swEncrypt.Write(data);
            }

            encryptedData = Convert.ToBase64String(msEncrypt.ToArray());
        }
    }
}

return encryptedData;
}

Example data:

   // Decrypted value is: 2029
   var _id = EncryptedSettingsBase.Decrypt("ROSNJ1XnAozF7LC0wW8AOg==");

I read the following post: http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/7cfcc576-1c2c-4a50-a546-09a45d3ff41f which looks like the same issue, however I haven't been able to get their suggestion to work, as I get the exception: 'Data error (cyclic redundancy check). (Exception from HRESULT: 0x80070017)'.

internal class EncryptedSettingsBase
{
    public static string Decrypt(string cipherText)
    {
        var passwordBytes = (new Guid("AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA")).ToByteArray();
        var salt = (new Guid("AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA")).ToString();

        byte[] bKey = new byte[16];
        for (int i = 0; i < 16; i++)
        {
            bKey[i] = passwordBytes[i];
        }

        IBuffer pwBuffer = CryptographicBuffer.CreateFromByteArray(bKey);
        IBuffer saltBuffer = CryptographicBuffer.ConvertStringToBinary(salt, BinaryStringEncoding.Utf16LE);
        IBuffer cipherBuffer = CryptographicBuffer.DecodeFromBase64String(cipherText);

        // Derive key material for password size 32 bytes for AES256 algorithm
        KeyDerivationAlgorithmProvider keyDerivationProvider = KeyDerivationAlgorithmProvider.OpenAlgorithm("PBKDF2_SHA1");
        // using salt and 1000 iterations
        KeyDerivationParameters pbkdf2Parms = KeyDerivationParameters.BuildForPbkdf2(saltBuffer, 1000);

        // create a key based on original key and derivation parmaters
        CryptographicKey keyOriginal = keyDerivationProvider.CreateKey(pwBuffer);
        IBuffer keyMaterial = CryptographicEngine.DeriveKeyMaterial(keyOriginal, pbkdf2Parms, 32);
        CryptographicKey derivedPwKey = keyDerivationProvider.CreateKey(pwBuffer);

        // derive buffer to be used for encryption salt from derived password key 
        IBuffer saltMaterial = CryptographicEngine.DeriveKeyMaterial(derivedPwKey, pbkdf2Parms, 16);

        // display the keys - because KeyDerivationProvider always gets cleared after each use, they are very similar unforunately
        string keyMaterialString = CryptographicBuffer.EncodeToBase64String(keyMaterial);
        string saltMaterialString = CryptographicBuffer.EncodeToBase64String(saltMaterial);

        SymmetricKeyAlgorithmProvider symProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm("AES_CBC_PKCS7");
        // create symmetric key from derived password material
        CryptographicKey symmKey = symProvider.CreateSymmetricKey(keyMaterial);

        // encrypt data buffer using symmetric key and derived salt material
        IBuffer resultBuffer = CryptographicEngine.Decrypt(symmKey, cipherBuffer, saltMaterial);
        string result = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf16LE, resultBuffer);
        return result;
    }
}

I'm probably doing something dumb, but I don't completely understand this stuff. Anyone know where I'm going wrong?

Any help is much appreciated.

Cheers, Jon

解决方案

The following code does the trick if I could change all my dependencies to encrypt properly:

Code here helped: http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/2966549-make-equal-aesmanaged-snippet-as-in-silverlight-an

Encryption code, C# 4.0 side:

string salt = "AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA";
string password = "AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA";

string EncryptedValue(string data)
{   
byte[] saltBytes = System.Text.Encoding.UTF8.GetBytes(salt);

string encryptedData = String.Empty;
using (System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged())
{
    var rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(password, saltBytes);

    aes.BlockSize = aes.LegalBlockSizes[0].MaxSize; 
    aes.KeySize = aes.LegalKeySizes[0].MaxSize; 
    aes.Key = rfc.GetBytes(32); 
    rfc.Reset(); 
    aes.IV = rfc.GetBytes(16);

    // Create a decrytor to perform the stream transform.
    System.Security.Cryptography.ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

    // Create the streams used for encryption.
    using (MemoryStream msEncrypt = new MemoryStream())
    {
        using (System.Security.Cryptography.CryptoStream csEncrypt = new System.Security.Cryptography.CryptoStream(msEncrypt, encryptor, System.Security.Cryptography.CryptoStreamMode.Write))
        {
            using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
            {
                // Write all data to the stream.
                swEncrypt.Write(data);
            }

            encryptedData = Convert.ToBase64String(msEncrypt.ToArray());
        }
    }
}

return encryptedData;
}

Decryption code WinRT side:

protected string Decrypt(string encryptedData)
    {
        const string password = "AAAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA";
        const string salt = "AAAAAAAAA-BBBB-AAAA-AAAA-AAAAAAAAAAAA";

        IBuffer pwBuffer = CryptographicBuffer.ConvertStringToBinary(password, BinaryStringEncoding.Utf8);
        IBuffer saltBuffer = CryptographicBuffer.ConvertStringToBinary(salt, BinaryStringEncoding.Utf8);
        IBuffer cipherBuffer = CryptographicBuffer.DecodeFromBase64String(encryptedData);

        KeyDerivationAlgorithmProvider keyDerivationProvider = KeyDerivationAlgorithmProvider.OpenAlgorithm("PBKDF2_SHA1");

        KeyDerivationParameters pbkdf2Parms = KeyDerivationParameters.BuildForPbkdf2(saltBuffer, 1000);

        CryptographicKey keyOriginal = keyDerivationProvider.CreateKey(pwBuffer);
        IBuffer keyMaterial = CryptographicEngine.DeriveKeyMaterial(keyOriginal, pbkdf2Parms, 32);

        CryptographicKey derivedPwKey = keyDerivationProvider.CreateKey(pwBuffer);

        IBuffer saltMaterial = CryptographicEngine.DeriveKeyMaterial(derivedPwKey, pbkdf2Parms, 16);

        SymmetricKeyAlgorithmProvider symProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm("AES_CBC_PKCS7");

        CryptographicKey symmKey = symProvider.CreateSymmetricKey(keyMaterial);

        IBuffer resultBuffer = CryptographicEngine.Decrypt(symmKey, cipherBuffer, saltMaterial);

        byte[] asd;
        CryptographicBuffer.CopyToByteArray(resultBuffer, out asd);
        string result = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, resultBuffer);
        return result;
    }

这篇关于Metro WinRT应用程序中的AesManaged Decryption的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！