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// Copyright 2024 Solar Designer. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Alternatively, this specific source file is also available under more
// relaxed terms (0-clause BSD license):
// Redistribution and use in source and binary forms, with or without
// modification, are permitted.
// yescrypt support sponsored by Sandfly Security https://sandflysecurity.com -
// Agentless Security for Linux
package yescrypt
import (
"bytes"
"errors"
)
// Hash computes yescrypt hash encoding given the password and existing yescrypt
// setting or full hash encoding. The salt and other parameters are decoded
// from setting. Currently supports (only a little more than) the subset of
// yescrypt parameters that libxcrypt can generate (as of libxcrypt 4.4.36).
func Hash(password, setting []byte) ([]byte, error) {
if len(setting) < 7 || string(setting[:4]) != "$y$j" || setting[6] != '$' {
return nil, errors.New("yescrypt: unsupported parameters")
}
// Proper yescrypt uses variable-length integers
// We take a shortcut approach that works in a more limited range
Nlog2 := atoi64(setting[4]) + 1
if Nlog2 < 10 || Nlog2 > 18 {
return nil, errors.New("yescrypt: N out of supported range")
}
r := atoi64(setting[5]) + 1
if r < 1 || r > 32 {
return nil, errors.New("yescrypt: r out of supported range")
}
saltEnd := bytes.LastIndexByte(setting, '$')
if saltEnd < 7 {
saltEnd = len(setting)
}
salt := Decode64(setting[7:saltEnd])
if salt == nil {
return nil, errors.New("yescrypt: bad salt encoding")
}
key, err := Key(password, salt, 1<<Nlog2, r, 1, 32)
if err != nil {
return nil, err
}
hash := Encode64(key)
return bytes.Join([][]byte{setting[0:saltEnd], hash}, []byte("$")), nil
}
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