public static string ToHMACString(this string encData, string encKey,
DeconvertCipherFormat deconvertCipherFormat)
{
var encoding = new UTF8Encoding();
var keyBuff = encoding.GetBytes(encKey);
byte[] hashMessage = null;
using (var hmacsha256 = new HMACSHA256(keyBuff)) {
var dataBytes = encoding.GetBytes(encData);
hashMessage = hmacsha256.ComputeHash(dataBytes);
}
return(hashMessage.jToHMACString());
}
public static byte[] DeConvertCipherText(string cipherText, DeconvertCipherFormat outputFormat)
{
byte[] decodeText = null;
switch (outputFormat)
{
case DeconvertCipherFormat.HEX:
decodeText = HexStringToByte(cipherText);
break;
case DeconvertCipherFormat.Base64:
decodeText = Convert.FromBase64String(cipherText);
break;
default:
throw new Exception("not implement exception.");
}
return(decodeText);
}
public string DecodeAES256(string cipherText, string cipherKey, string cipherIV, CipherMode cipherMode, PaddingMode paddingMode, DeconvertCipherFormat format)
{
byte[] byteKey = Encoding.UTF8.GetBytes(cipherKey);
byte[] byteIV = Encoding.UTF8.GetBytes(cipherIV);
byte[] byteBuff = HMACCipherCommon.DeConvertCipherText(cipherText, format);
using (AesCryptoServiceProvider aesCrytoProvider = new AesCryptoServiceProvider())
{
try
{
aesCrytoProvider.Mode = cipherMode;
aesCrytoProvider.Padding = paddingMode;
var dec = aesCrytoProvider.CreateDecryptor(byteKey, byteIV).TransformFinalBlock(byteBuff, 0, byteBuff.Length);
return(Encoding.UTF8.GetString(dec));
}
catch (Exception e)
{
return(string.Empty);
}
}
}
public static string ToDecAES256(this string cipherText, string cipherKey, string cipherIV,
CipherMode cipherMode, PaddingMode paddingMode, DeconvertCipherFormat format)
{
var byteKey = Encoding.UTF8.GetBytes(cipherKey);
var byteIV = Encoding.UTF8.GetBytes(cipherIV);
var byteBuff = cipherText.jToHMACBytes(format);
using (var aesCrytoProvider = new AesCryptoServiceProvider()) {
try {
aesCrytoProvider.Mode = cipherMode;
aesCrytoProvider.Padding = paddingMode;
var dec = aesCrytoProvider.CreateDecryptor(byteKey, byteIV)
.TransformFinalBlock(byteBuff, 0, byteBuff.Length);
return(Encoding.UTF8.GetString(dec));
}
finally {
aesCrytoProvider.Dispose();
}
}
}
public CryptoHMAC(DeconvertCipherFormat deconvertCipherFormat)
{
_deconvertCipherFormat = deconvertCipherFormat;
}