Classic ASP Requires Chilkat v11.6.0+

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).

Background. For hashing, the salt is optional — when omitted, a random salt of saltLen bytes (default 16) is generated, which is the normal case. A secret or ad is not stored in the PHC string; the same values must be supplied to Argon2VerifyPassword for the password to verify.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
set crypt = Server.CreateObject("Chilkat.Crypt2")

'  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.
set json = Server.CreateObject("Chilkat.JsonObject")
success = json.UpdateString("variant","argon2id")
success = json.UpdateInt("memoryCostKb",131072)
success = json.UpdateInt("iterations",4)
success = json.UpdateInt("parallelism",2)
success = 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.
success = json.UpdateString("secret","application-wide-pepper")
success = json.UpdateString("secretEncoding","utf-8")

phcHash = crypt.Argon2HashPassword(password,json.Emit())
If (crypt.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( phcHash) & "</pre>"

%>
</body>
</html>