/// <summary> 对字符串进行对称加密 </summary>
public static string SymmetricEncrypt(string inputString, SymmetricFormat symmetricFormat, string key,
string iv)
{
var algorithm = GetSymmetricAlgorithm(symmetricFormat);
var desString = Encoding.UTF8.GetBytes(inputString);
var desKey = Encoding.ASCII.GetBytes(key);
var desIv = Encoding.ASCII.GetBytes(iv);
if (!algorithm.ValidKeySize(desKey.Length * 8))
{
throw new ArgumentOutOfRangeException("key");
}
if (algorithm.IV.Length != desIv.Length)
{
throw new ArgumentOutOfRangeException("iv");
}
var mStream = new MemoryStream();
var cStream = new CryptoStream(mStream, algorithm.CreateEncryptor(desKey, desIv), CryptoStreamMode.Write);
cStream.Write(desString, 0, desString.Length);
cStream.FlushFinalBlock();
cStream.Close();
return(Convert.ToBase64String(mStream.ToArray()));
}
/// <summary> 获取对称加密方法 </summary>
private static SymmetricAlgorithm GetSymmetricAlgorithm(SymmetricFormat symmetricFormat)
{
SymmetricAlgorithm algorithm = null;
switch (symmetricFormat)
{
case SymmetricFormat.DES:
algorithm = DES.Create();
break;
case SymmetricFormat.TripleDES:
algorithm = TripleDES.Create();
break;
case SymmetricFormat.RC2:
algorithm = RC2.Create();
break;
case SymmetricFormat.Rijndael:
algorithm = Rijndael.Create();
break;
case SymmetricFormat.AES:
algorithm = Aes.Create();
break;
}
return(algorithm);
}
/// <summary> 获取对称加密方法 </summary>
private static SymmetricAlgorithm GetSymmetricAlgorithm(SymmetricFormat symmetricFormat)
{
SymmetricAlgorithm algorithm;
switch (symmetricFormat)
{
case SymmetricFormat.DES:
algorithm = DES.Create();
break;
case SymmetricFormat.TripleDES:
algorithm = TripleDES.Create();
break;
case SymmetricFormat.RC2:
algorithm = RC2.Create();
break;
case SymmetricFormat.Rijndael:
algorithm = Rijndael.Create();
break;
case SymmetricFormat.AES:
algorithm = Aes.Create();
break;
default:
throw new ArgumentOutOfRangeException(nameof(symmetricFormat), symmetricFormat, null);
}
return(algorithm);
}
/// <summary> 对字符串进行对称解密 </summary>
public static string SymmetricDecrypt(string inputString, SymmetricFormat symmetricFormat, string key,
string iv)
{
if (string.IsNullOrWhiteSpace(inputString))
{
return(inputString);
}
inputString = inputString.CleanBase64();
if (!inputString.IsBase64())
{
return(string.Empty);
}
var algorithm = GetSymmetricAlgorithm(symmetricFormat);
var desString = Convert.FromBase64String(inputString);
var desKey = Encoding.ASCII.GetBytes(key);
var desIv = Encoding.ASCII.GetBytes(iv);
var mStream = new MemoryStream();
var cStream = new CryptoStream(mStream, algorithm.CreateDecryptor(desKey, desIv), CryptoStreamMode.Write);
cStream.Write(desString, 0, desString.Length);
cStream.FlushFinalBlock();
cStream.Close();
return(Encoding.UTF8.GetString(mStream.ToArray()));
}
/// <summary>
/// 对字符串进行对称解密
/// </summary>
public static string SymmetricDecrypt(string inputString, SymmetricFormat symmetricFormat, string key, string iv)
{
SymmetricAlgorithm algorithm = GetSymmetricAlgorithm(symmetricFormat);
byte[] desString = Convert.FromBase64String(inputString);
byte[] desKey = Encoding.ASCII.GetBytes(key);
byte[] desIV = Encoding.ASCII.GetBytes(iv);
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, algorithm.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);
cStream.Write(desString, 0, desString.Length);
cStream.FlushFinalBlock();
cStream.Close();
return(Encoding.UTF8.GetString(mStream.ToArray()));
}
/// <summary>
/// 获取加密方法
/// </summary>
/// <param name="symmetricFormat"></param>
/// <returns></returns>
private static SymmetricAlgorithm GetSymmetricAlgorithm(SymmetricFormat symmetricFormat)
{
SymmetricAlgorithm algorithm = null;
switch (symmetricFormat)
{
case SymmetricFormat.DES:
algorithm = DES.Create();
break;
case SymmetricFormat.TripleDES:
algorithm = TripleDES.Create();
break;
case SymmetricFormat.RC2:
algorithm = RC2.Create();
break;
case SymmetricFormat.Rijindael:
algorithm = Rijndael.Create();
break;
case SymmetricFormat.AES:
algorithm = Aes.Create();
break;
}
return algorithm;
}
/// <summary>
/// 对字符串进行对称加密
/// </summary>
/// <param name="inputString"></param>
/// <param name="symmetricFormat"></param>
/// <param name="key"></param>
/// <param name="iv"></param>
/// <returns></returns>
public static string SymmetricEncrypt(string inputString, SymmetricFormat symmetricFormat, string key, string iv)
{
SymmetricAlgorithm algorithm = GetSymmetricAlgorithm(symmetricFormat);
byte[] desString = Encoding.UTF8.GetBytes(inputString);
byte[] desKey = Encoding.UTF8.GetBytes(key.Substring(0, algorithm.Key.Length));
byte[] desIV = Encoding.UTF8.GetBytes(iv.Substring(0, algorithm.IV.Length));
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, algorithm.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
cStream.Write(desString, 0, desString.Length);
cStream.FlushFinalBlock();
cStream.Close();
return Convert.ToBase64String(mStream.ToArray());
}
