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).

    crypt := chilkat.NewCrypt2()

    //  The password should come from a secure source rather than being hard-coded.
    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.
    json := chilkat.NewJsonObject()
    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")

    phcHash := crypt.Argon2HashPassword(password,*json.Emit())
    if crypt.LastMethodSuccess() == false {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        json.DisposeJsonObject()
        return
    }

    fmt.Println(*phcHash)

    crypt.DisposeCrypt2()
    json.DisposeJsonObject()