public static string Encrypt(string plain, string sectret, string salt)
{
string result = null;
//Schlüssel für crypt und hmac erzeugen
byte[] hashBytes = null;
string hash = Hashhelper.Hash((sectret + salt), out hashBytes, _encoding);
// IV erzeugen 16 bytes lang
int ivSize = 16;
byte[] ivBytes = null;
string iv = InitialisationVectorHelper.CreateInitialisationVextorStringWithOpenSSL(ivSize, out ivBytes, _encoding);
// Verschlüsseln
string encrypted = EncryptHelper.EncryptWithOpenSSLCrypt(plain, hashBytes, ivBytes, _encoding);
string ciphertext = iv + encrypted;
// HMAC erzeugen
string hmac = HmacHelper.HashHmacWithOpenSSLSHA256(ciphertext, hashBytes, _encoding);
//zusammenfügen dann zu hex umwandeln und fertig
byte[] resultBytes = _encoding.GetBytes(hmac + ciphertext);
result = HexHelper.GetHexFromBytes(resultBytes);
return(result);
}
public static string Hash(string data, out byte[] hashBytes, Encoding encoding)
{
string key = null;
byte[] hashBytes2 = null;
string hash = Hashhelper.HashWithSHA2561(data, ref hashBytes2, encoding);
key = hash.Substring(0, 32);
hashBytes = new byte[32];
hashBytes = encoding.GetBytes(key);
return(key);
}