本文整理汇总了C#中System.Security.Cryptography.SymmetricAlgorithm.CreateDecryptor方法的典型用法代码示例。如果您正苦于以下问题：C# SymmetricAlgorithm.CreateDecryptor方法的具体用法？C# SymmetricAlgorithm.CreateDecryptor怎么用？C# SymmetricAlgorithm.CreateDecryptor使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Security.Cryptography.SymmetricAlgorithm的用法示例。
在下文中一共展示了SymmetricAlgorithm.CreateDecryptor方法的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: DecryptString
/// <summary>
/// 解密
/// </summary>
/// <param name="value">要解密的值</param>
/// <returns>解密后值</returns>
public static string DecryptString(string value)
{
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
byte[] byt;
//// 设置加密Key
string txtKey = "tkGGRmBErvc=";
//// 设置加密IV
string txtIV = "Kl7ZgtM1dvQ=";
mcsp = SetEnc();
byte[] byt2 = Convert.FromBase64String(txtKey);
mcsp.Key = byt2;
byte[] byt3 = Convert.FromBase64String(txtIV);
mcsp.IV = byt3;
ct = mcsp.CreateDecryptor(mcsp.Key, mcsp.IV);
byt = Convert.FromBase64String(value);
ms = new MemoryStream();
cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Encoding.UTF8.GetString(ms.ToArray());
}示例2: Decrypt
private static string Decrypt(byte[] cipher, string passPhrase, string salt, SymmetricAlgorithm algorithm)
{
var saltBytes = Encoding.UTF8.GetBytes(salt);
algorithm.Padding = PaddingMode.None;
using (algorithm)
{
using (var password = new Rfc2898DeriveBytes(passPhrase, saltBytes))
{
algorithm.Key = password.GetBytes(algorithm.KeySize / 8);
algorithm.IV = password.GetBytes(algorithm.BlockSize / 8);
using (var memStream = new MemoryStream(cipher))
{
using (
var cryptoStream = new CryptoStream(memStream, algorithm.CreateDecryptor(),
CryptoStreamMode.Read))
{
using (var sr = new StreamReader(cryptoStream))
{
return sr.ReadToEnd();
}
}
}
}
}
}示例3: DecryptString
public static string DecryptString(string Value, string parKey)
{
mCSP = SetEnc();
string iv = "PenS8UCVF7s=";
mCSP.IV = Convert.FromBase64String(iv);
string key = SetLengthString(parKey.ToString(), 32);
mCSP.Key = Convert.FromBase64String(key);
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
Byte[] byt = new byte[64];
try
{
ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);
byt = Convert.FromBase64String(Value);
ms = new MemoryStream();
cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Encoding.UTF8.GetString(ms.ToArray());
}
catch (Exception ex)
{
throw (new Exception("An error occurred while decrypting string"));
}
}示例4: DecryptBytes
public static byte[] DecryptBytes(SymmetricAlgorithm symAlg, byte[] inBytes)
{
ICryptoTransform xfrm = symAlg.CreateDecryptor();
byte[] outBlock = xfrm.TransformFinalBlock(inBytes, 0, inBytes.Length);
return outBlock;
}示例5: DecryptStringFromBytes
/// <summary>
/// 解密数据.
/// </summary>
/// <param name="service"> 解密处理的服务 </param>
/// <param name="cipherText"> 被加密的字节数组 </param>
/// <returns> 解密后的文本信息 </returns>
public string DecryptStringFromBytes(SymmetricAlgorithm service, byte[] cipherText)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
// 预期返回的结果.
string plaintext = null;
// 创建对称解密器对象。
ICryptoTransform decryptor = service.CreateDecryptor();
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
// 返回.
return plaintext;
}示例6: Desencriptar
public static byte[] Desencriptar(byte[] mensajeEncriptado,
SymmetricAlgorithm algoritmo)
{
int numeroBytesDesencriptados = 0;
// La clase SymmetricAlgorithm delega el proceso de desencriptación de datos
// Una instancia de ICryptoTransform transforma texto plano en texto cifrado o vice versa.
// Las siguiente sentencia demuestra como crear transformaciones usando CreateDecryptor.
byte[] mensajeDesencriptado = new
byte[mensajeEncriptado.Length];
// Crear una ICryptoTransform que puede ser usada para desencriptar datos
ICryptoTransform desencriptador =
algoritmo.CreateDecryptor();
// Procedemos a descifrar el mensaje
MemoryStream memoryStream = new
MemoryStream(mensajeEncriptado);
// Creamos el CryptoStream
CryptoStream cryptoStream = new CryptoStream(memoryStream,
desencriptador, CryptoStreamMode.Read);
// Decrypting data and get the count of plain text bytes.
numeroBytesDesencriptados = cryptoStream.Read(mensajeDesencriptado, 0, mensajeDesencriptado.Length);
// Liberamos recursos.
memoryStream.Close();
cryptoStream.Close();
return mensajeDesencriptado;
}示例7: DecryptPassword
/// <summary>
/// Decrypts the offline transaction file using the TripleDES cryptography.
/// </summary>
/// <param name="Password"> Password to be decrypted</param>
/// <returns></returns>
public static string DecryptPassword(string Password)
{
DES = new TripleDESCryptoServiceProvider();
byte[] encryptedBytes = Convert.FromBase64String(Password);
byte[] decryptedBytes = DES.CreateDecryptor().TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return Encoding.UTF8.GetString(decryptedBytes);
}示例8: CipherTextStealingMode
/// <summary>
/// Initialize CipherTextStealingMode with a specific symmetric algorithm
/// </summary>
/// <param name="symmetricAlgorithm">The symmetric algorithm</param>
public CipherTextStealingMode(SymmetricAlgorithm symmetricAlgorithm)
{
// in CTS Mode there is no padding
symmetricAlgorithm.Padding = PaddingMode.None;
// set the symmetric algorithm's mode to ECB
// (for single block encryption and decryption)
symmetricAlgorithm.Mode = CipherMode.ECB;
// get the symmetric algorithm's block size in bytes
blockSize = symmetricAlgorithm.BlockSize / 8;
if (blockSize != symmetricAlgorithm.IV.Length)
{
throw new ArgumentException(
"The IV size should equal to the block size.");
}
// initialize local IV
iv = symmetricAlgorithm.IV;
// initialize cipher state using the symmetric algorithms's IV
cipherState = new byte[blockSize];
symmetricAlgorithm.IV.CopyTo(cipherState, 0);
// create encryptor and decryptor
encryptor = symmetricAlgorithm.CreateEncryptor();
decryptor = symmetricAlgorithm.CreateDecryptor();
}示例9: Decrypt
private byte[] Decrypt(SymmetricAlgorithm sa, byte[] source)
{
System.Diagnostics.Trace.WriteLine(string.Format("DE:CSP:Key[{0}], IV[{1}]",
Convert.ToBase64String(this.__cspExternal.Key), Convert.ToBase64String(this.__cspExternal.IV)));
try
{
MemoryStream ms = new MemoryStream(source);
CryptoStream cs = new CryptoStream(ms, sa.CreateDecryptor(), CryptoStreamMode.Read);
BinaryReader br = new BinaryReader(cs);
try
{
return br.ReadBytes(source.Length);
}
catch (Exception)
{ }
finally
{
br.Close();
cs.Close();
ms.Close();
}
}
catch (Exception)
{
}
return null;
}示例10: Decrypt
private byte[] Decrypt (SymmetricAlgorithm algo, PaddingMode padding, byte[] data)
{
algo.IV = new byte [algo.BlockSize >> 3];
algo.Mode = CipherMode.CBC;
algo.Padding = padding;
ICryptoTransform ct = algo.CreateDecryptor ();
return ct.TransformFinalBlock (data, 0, data.Length);
}示例11: CreateCryptoTransform
private static ICryptoTransform CreateCryptoTransform(SymmetricAlgorithm algorithm, CryptoAction action)
{
byte[] key = Encoding.ASCII.GetBytes(stringKey);
byte[] vector = Encoding.ASCII.GetBytes(stringVector);
return action == CryptoAction.Encrypt
? algorithm.CreateEncryptor(key, vector)
: algorithm.CreateDecryptor(key, vector);
}示例12: Decrypt
/// <summary>
/// Decrypts given text
/// </summary>
/// <param name="encryptedText">Text to decrypt</param>
/// <param name="key">Key, used for decryption</param>
/// <param name="iv">Initialization Vector</param>
/// <param name="cryptoProvider">Cryptography algorithm</param>
/// <returns>Decrypted text</returns>
public static string Decrypt(string encryptedText, byte[] key, byte[] iv, SymmetricAlgorithm cryptoProvider)
{
//using (var cryptoProvider = Rijndael.Create())
using (cryptoProvider)
using (var memoryStream = new MemoryStream(Convert.FromBase64String(encryptedText)))
using (var cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateDecryptor(key, iv), CryptoStreamMode.Read))
using (var reader = new StreamReader(cryptoStream))
{
return reader.ReadToEnd();
}
}示例13: Decrypt_and_deserialize
public static string[][] Decrypt_and_deserialize(MemoryStream memoryStream, SymmetricAlgorithm des)
{
using (memoryStream)
{
using (var cs = new CryptoStream(memoryStream, des.CreateDecryptor(des.Key, des.IV), CryptoStreamMode.Read))
{
var xmlser = new XmlSerializer(typeof(string[][]));
return (string[][])xmlser.Deserialize(cs);
}
}
}示例14: Decrypt
internal static byte[] Decrypt(SymmetricAlgorithm crypter, byte[] encryptedData, byte[] cryptoKey, byte[] authKey, int clearTextPayloadLength = 0)
{
using (var hmac = new HMACSHA256(authKey))
{
//Ready the tag and iv array
var dataTag = new byte[hmac.HashSize / 8];
var iv = new byte[crypter.BlockSize / 8];
//if message length is too small just return null
if (encryptedData.Length < dataTag.Length + clearTextPayloadLength + iv.Length)
{
return null;
}
//Get the sent tag and the expected tag
Array.Copy(encryptedData, encryptedData.Length - dataTag.Length, dataTag, 0, dataTag.Length);
var expectedTag = hmac.ComputeHash(encryptedData, 0, encryptedData.Length - dataTag.Length);
//Compare Tags with constant time comparison
var compare = 0;
for (var i = 0; i < dataTag.Length; i++)
{
compare |= dataTag[i] ^ expectedTag[i];
}
//if message doesn't authenticate return null
if (compare != 0)
{
return null;
}
//Get the IV from message
Array.Copy(encryptedData, clearTextPayloadLength, iv, 0, iv.Length);
using (var decrypter = crypter.CreateDecryptor(cryptoKey, iv))
using (var plainTextStream = new MemoryStream())
{
using (var decrypterStream = new CryptoStream(plainTextStream, decrypter, CryptoStreamMode.Write))
{
//Decrypt Cipher Text from Message
decrypterStream.Write(
encryptedData,
clearTextPayloadLength + iv.Length,
encryptedData.Length - clearTextPayloadLength - iv.Length - dataTag.Length);
decrypterStream.FlushFinalBlock();
}
//Return Plain Text
return plainTextStream.ToArray();
}
}
}示例15: Decrypt
public static string Decrypt(SymmetricAlgorithm aesAlg, byte[] cipherText)
{
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
return srDecrypt.ReadToEnd();
}
}