BrightSign Object Reference Manual (FW 5.1) - Manual (Page 149)

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pass = CreateObject("roByteArray")
pass.FromAsciiString("password")
salt.FromAsciiString("salt")
' Create the key generator
pk = CreateObject("roPassKey", { method: "pbkdf2", keyfn: "hmac-sha256", keylen: 32,
iterations: 4096 } )
' key with be a roByteArray
key = pk.GenerateKey(pass, salt)