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).

import sys
import chilkat

crypt = chilkat.CkCrypt2()

#  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.CkJsonObject()
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.get_LastMethodSuccess() == False):
    print(crypt.lastErrorText())
    sys.exit()

print(phcHash)