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| static private Random _random = new Random(Environment.TickCount);
static public string RandomString(int length)
{
string chars = "0123456789abcdefghijklmnopqrstuvwxyz";
StringBuilder builder = new StringBuilder(length);
for (int i = 0; i < length; ++i)
builder.Append(chars[_random.Next(chars.Length)]);
return builder.ToString();
}
static string EncryptBytesToString(byte[] InputBuffer, string Key)
{
// Check arguments.
if (InputBuffer == null || InputBuffer.Length <= 0)
throw new ArgumentNullException("InputBuffer");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
//génère aléatoirement le IV
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] IV = new byte[16];
IV = encoder.GetBytes(RandomString(16));
byte[] byteKey = encoder.GetBytes(Key);
byte[] encrypted;
// Create an RijndaelManaged object with the specified key and IV.
RijndaelManaged rijAlg = new RijndaelManaged
{
Key = byteKey,
IV = IV,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7
};
// convert the byte array to string
string value = BitConverter.ToString(InputBuffer).Replace("-", string.Empty);
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(value);
}
}
encrypted = msEncrypt.ToArray();
}
// concatenate IV and encrypted pwd
byte[] rv = new byte[IV.Length + encrypted.Length];
Buffer.BlockCopy(IV, 0, rv, 0, IV.Length);
Buffer.BlockCopy(encrypted, 0, rv, IV.Length, encrypted.Length);
// convert the result to base64
var strBase64 = Convert.ToBase64String(rv);
// return the final result
return strBase64;
}
static string DecryptBytesToString(byte[] InputBuffer, string Key)
{
// Check arguments.
if (InputBuffer == null || InputBuffer.Length <= 0)
throw new ArgumentNullException("InputBuffer");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
InputBuffer = Convert.FromBase64String(Encoding.UTF8.GetString(InputBuffer));
//génère aléatoirement le IV
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] IV = new byte[16];
Buffer.BlockCopy(InputBuffer, 0, IV, 0, 16);
byte[] byteKey = encoder.GetBytes(Key);
// Create an RijndaelManaged object with the specified key and IV.
RijndaelManaged rijAlg = new RijndaelManaged
{
Key = byteKey,
IV = IV,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7
};
// convert the byte array to string
byte[] bMdp = new byte[InputBuffer.Length - 16];
Buffer.BlockCopy(InputBuffer, 16, bMdp, 0, (InputBuffer.Length - 16));
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
string decrypted;
// Create the streams used for encryption.
using (MemoryStream msDecrypt = new MemoryStream(bMdp))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDrcrypt = new StreamReader(csDecrypt))
{
//Write all data to the stream.
decrypted = srDrcrypt.ReadToEnd();
}
}
}
string mdp = "";
byte[] raw = new byte[decrypted.Length / 2];
for (int i = 0; i < raw.Length; i++)
{
raw[i] = Convert.ToByte(decrypted.Substring(i * 2, 2), 16);
}
mdp = Encoding.ASCII.GetString(raw);
Console.WriteLine(mdp);
return decrypted;
}
static public String login(string client_id, string password)
{
byte[] tmpSource;
//Crée un tableau d'octets à partir du mot de passe
tmpSource = Encoding.ASCII.GetBytes(password);
//Calcule le hachage d'après les données sources
byte[] hashedpassword = new SHA256CryptoServiceProvider().ComputeHash(tmpSource);
// crypte le mot de passe haché
string encrypted = EncryptBytesToString(hashedpassword, client_id);
string decrypted = DecryptBytesToString(Encoding.ASCII.GetBytes(encrypted), client_id);
byte[] tmpNewHash = Encoding.ASCII.GetBytes(decrypted);
bool bEqual = false;
if (tmpNewHash.Length == hashedpassword.Length)
{
int i = 0;
while ((i < tmpNewHash.Length) && (tmpNewHash[i] == hashedpassword[i]))
{
i += 1;
}
if (i == tmpNewHash.Length)
{
bEqual = true;
}
}
if (bEqual)
Console.WriteLine("ok");
else
Console.WriteLine("pas ok");
return "ok";
}
static void Main(string[] args)
{
string client_id = RandomString(32);
string token = login(client_id, "*******");
Console.Read();
} |
Problème décryptage et comparaison de hashs
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