public static ICryptoTransform CreateEncryptor(string key, CryptionType type)
{
ICryptoTransform transform;
SHA512 sha512 = new SHA512CryptoServiceProvider();
var bytes = sha512.ComputeHash(Sha1(key).ToAsciiBytes());
switch (type)
{
case CryptionType.Aes:
var aes = Rijndael.Create();
aes.Mode = CipherMode.CBC;
transform = aes.CreateEncryptor(bytes.Skip(17).Take(32).ToArray(), bytes.Skip(17).Take(16).ToArray());
aes.Clear();
break;
case CryptionType.Des:
var des = new DESCryptoServiceProvider { Mode = CipherMode.CBC };
transform = des.CreateEncryptor(bytes.Skip(17).Take(8).ToArray(), bytes.Skip(17).Take(16).ToArray());
des.Clear();
break;
default:
var tripleDes = new TripleDESCryptoServiceProvider { Mode = CipherMode.CBC };
transform = tripleDes.CreateEncryptor(bytes.Skip(17).Take(24).ToArray(), bytes.Skip(17).Take(16).ToArray());
tripleDes.Clear();
break;
}
return transform;
}
/// <summary>
/// 加密成base64字符串
/// </summary>
/// <param name="plainStr"></param>
/// <param name="key"></param>
/// <param name="type"></param>
/// <returns></returns>
public static string Encrypt2Base64(string plainStr, string key, CryptionType type)
{
var byteArray = plainStr.ToUtf8Bytes();
var mStream = new MemoryStream();
var cStream = new CryptoStream(mStream, BaseCryption.CreateEncryptor(key, type), CryptoStreamMode.Write);
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
var encrypt = mStream.ToArray().Bytes2Base64();
cStream.Close();
return encrypt;
}
/// <summary>
/// 从nase64字符串解密
/// </summary>
/// <param name="base64"></param>
/// <param name="key"></param>
/// <param name="type"></param>
/// <returns></returns>
public static string DecryptFromBase64(string base64, string key, CryptionType type)
{
var byteArray = base64.Base64ToBytes();
var mStream = new MemoryStream();
var cStream = new CryptoStream(mStream, BaseCryption.CreateDecryptor(key, type), CryptoStreamMode.Write);
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
var decrypt = mStream.ToArray().FromUtf8Bytes();
cStream.Close();
return decrypt;
}
/// <summary>
/// 从16进制字符串解密
/// </summary>
/// <param name="encryptStr"></param>
/// <param name="key"></param>
/// <param name="type"></param>
/// <returns></returns>
public static string Decrypt(string encryptStr, string key, CryptionType type)
{
var byteArray = encryptStr.Hex2Bytes();
var mStream = new MemoryStream();
var cStream = new CryptoStream(mStream, BaseCryption.CreateDecryptor(key, type), CryptoStreamMode.Write);
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
var decrypt = Encoding.UTF8.GetString(mStream.ToArray());
cStream.Close();
return decrypt;
}
