B4X 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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Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

'  The password should come from a secure source rather than being hard-coded.
Dim password As String = "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.
Dim json As ChilkatJsonObject
json.Initialize
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")

Dim phcHash As String = crypt.Argon2HashPassword(password, json.Emit)
If crypt.LastMethodSuccess = False Then
    Log(crypt.LastErrorText)
    Return
End If

Log(phcHash)