Hash a Password with Argon2 (Tuned Options)

Demonstrates Crypt2.Argon2HashPassword with explicit options: the cost parameters, saltLen (how many random salt bytes to generate when no salt is given), and an optional secret (pepper).

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

//  The password should come from a secure source rather than being hard-coded.
string password = "correct horse battery staple";

//  The Argon2 options are the same members as Argon2DeriveKey, except the salt is optional for
//  hashing.  When no "salt" is given, a random salt is generated; "saltLen" (default 16, range 8..1024)
//  sets how many random bytes to use.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("variant","argon2id");
json.UpdateInt("memoryCostKb",131072);
json.UpdateInt("iterations",4);
json.UpdateInt("parallelism",2);
json.UpdateInt("saltLen",16);

//  A secret (pepper) and/or ad may be used, but neither is stored in the returned PHC string.  The
//  same values must be supplied to Argon2VerifyPassword for the password to verify.
json.UpdateString("secret","application-wide-pepper");
json.UpdateString("secretEncoding","utf-8");

string phcHash = crypt.Argon2HashPassword(password,json.Emit());
if (crypt.LastMethodSuccess == false) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

Debug.WriteLine(phcHash);