public string GetHMACValue(string encData, string encKey)
{
UTF8Encoding encoding = new UTF8Encoding();
byte[] keyBuff = encoding.GetBytes(encKey);
byte[] hashMessage = null;
using (var hmacsha256 = new HMACSHA256(keyBuff))
{
byte[] dataBytes = encoding.GetBytes(encData);
hashMessage = hmacsha256.ComputeHash(dataBytes);
}
return(HMACCipherCommon.ByteToString(hashMessage));
}
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 string EncodeAES256(string plainText, string cipherKey, string cipherIV, CipherMode cipherMode, PaddingMode paddingMode)
{
byte[] byteKey = Encoding.UTF8.GetBytes(cipherKey);
byte[] byteIV = Encoding.UTF8.GetBytes(cipherIV);
string strEncode = string.Empty;
byte[] bytePlainText = Encoding.UTF8.GetBytes(plainText);
using (AesCryptoServiceProvider aesCryptoProvider = new AesCryptoServiceProvider())
{
try
{
aesCryptoProvider.Mode = cipherMode;
aesCryptoProvider.Padding = paddingMode;
return(HMACCipherCommon.ByteToString(aesCryptoProvider.CreateEncryptor(byteKey, byteIV).TransformFinalBlock(bytePlainText, 0, bytePlainText.Length)));
}
catch
{
return(string.Empty);
}
}
}