public static CraChallenge Create(IDictionary <string, string> extra)
{
if (extra == null || !extra.TryGetValue("salt", out string salt))
{
return(null);
}
else
{
CraChallenge result = new CraChallenge();
result.Salt = salt;
if (extra.TryGetValue("iterations", out string strTemp))
{
if (int.TryParse(strTemp, out int iterations))
{
result.Iterations = iterations;
}
}
if (extra.TryGetValue("keylen", out strTemp))
{
if (int.TryParse(strTemp, out int keyLen))
{
result.KeyLength = keyLen;
}
}
return(result);
}
}
/// <summary>
/// Computes a derived cryptographic key from a password according to PBKDF2
/// http://en.wikipedia.org/wiki/PBKDF2. The function will only return a derived key
/// if at least 'salt' is present in the 'extra' dictionary. The complete set of
/// attributes that can be set in 'extra':
/// salt: The salt value to be used.
/// iterations: Number of iterations of derivation algorithm to run.
/// keylen: Key length to derive.
/// </summary>
/// <param name="secret">The secret key from which to derive. </param>
/// <param name="extra"> Extra data for salting the secret. Possible key values 'salt'
/// (required, otherwise returns @secret), 'iterations' (1000 default),
/// and/or 'keylen' (32 default). </param>
/// <returns>A derived key (Base64 encoded) if a salt is provided in the extra parameter, or the
/// value of parameter 'secret' if not.</returns>
public static string DeriveKey(string secret, IDictionary <string, string> extra)
{
IWampCraChallenge adapter = CraChallenge.Create(extra);
string result = DeriveKey(secret, adapter);
return(result);
}
/// <summary>
/// Compute the authentication signature from an authentication challenge and a secret.
/// </summary>
/// <param name="authChallenge">The authentication challenge. </param>
/// <param name="authSecret">The authentication secret. </param>
/// <param name="authExtra">Extra data for salting the secret. Possible key values 'salt'
/// (required, otherwise uses @authSecret), 'iterations' (1000
/// default), and/or 'keylen' (32 default). </param>
/// <returns>The authentication signature.</returns>
public static string AuthSignature(string authChallenge, string authSecret, IDictionary <string, string> authExtra)
{
return(AuthSignature(authChallenge, authSecret, CraChallenge.Create(authExtra)));
}
