/// <summary>
/// AES解密
/// </summary>
/// <param name="cipherText">密文字符串</param>
/// <param name="Key">密钥</param>
/// <returns>返回解密后的明文字符串</returns>
public string AESDecrypt(string showText, string Key, AesKeyLength keyLengh)
{
int keyL = 32;
switch (keyLengh)
{
case AesKeyLength.Long256:
keyL = 32;
break;
case AesKeyLength.Middle128:
keyL = 16;
break;
case AesKeyLength.Short64:
keyL = 8;
break;
}
Byte[] encryptedBytes = Convert.FromBase64String(showText);
Byte[] bKey = new Byte[keyL];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
MemoryStream mStream = new MemoryStream(encryptedBytes);
//mStream.Write( encryptedBytes, 0, encryptedBytes.Length );
//mStream.Seek( 0, SeekOrigin.Begin );
RijndaelManaged aes = new RijndaelManaged();
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
aes.KeySize = 128;
aes.Key = bKey;
//aes.IV = _iV;
CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
try
{
byte[] tmp = new byte[encryptedBytes.Length + 32];
int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);
byte[] ret = new byte[len];
Array.Copy(tmp, 0, ret, 0, len);
return(Encoding.UTF8.GetString(ret));
}
finally
{
cryptoStream.Close();
mStream.Close();
aes.Clear();
}
}
/// <summary>
/// AES加密算法
/// </summary>
/// <param name="plainText">明文字符串</param>
/// <param name="Key">密钥</param>
/// <returns>将加密后的密文转换为Base64编码，以便显示</returns>
public string AESEncrypt(string plainText, string Key, AesKeyLength keyLengh)
{
int keyL = 32;
switch (keyLengh)
{
case AesKeyLength.Long256:
keyL = 32;
break;
case AesKeyLength.Middle128:
keyL = 16;
break;
case AesKeyLength.Short64:
keyL = 8;
break;
}
MemoryStream mStream = new MemoryStream();
RijndaelManaged aes = new RijndaelManaged();
byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
Byte[] bKey = new Byte[keyL];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
aes.KeySize = 128;
//aes.Key = _key;
aes.Key = bKey;
//aes.IV = _iV;
CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
try
{
cryptoStream.Write(plainBytes, 0, plainBytes.Length);
cryptoStream.FlushFinalBlock();
return(Convert.ToBase64String(mStream.ToArray()));
}
finally
{
cryptoStream.Close();
mStream.Close();
aes.Clear();
}
}
