c# – Metro WinRT应用程序中的AesManaged Decryption
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我有一些文本,由C#的AesManaged加密,必须在WinRT Metro应用程序中解密.我无法更改加密代码,因为代码具有其他无法更改的依赖项.
加密函数如下所示:
// 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;
}
示例数据:
// Decrypted value is: 2029
var _id = EncryptedSettingsBase.Decrypt("ROSNJ1XnAozF7LC0wW8AOg==");
我看了以下帖子:
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/7cfcc576-1c2c-4a50-a546-09a45d3ff41f
看起来像是同一个问题,但是我无法得到他们的建议,因为我得到了例外:’数据错误(循环冗余检查). (HRESULT异常: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;
}
}
我可能做了一些蠢事,但我并不完全理解这些东西.谁知道我哪里出错了?
任何帮助深表感谢.
干杯,
乔恩
解决方法:
您在一侧使用PBKDF2而在.net部分中没有使用PBKDF2.不幸的是,你无法改变的部分没有正确使用密钥;它只是直接使用UID.
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