63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package gaspass
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import (
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"encoding/binary"
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"errors"
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"golang.org/x/crypto/argon2"
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)
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const (
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CharsLower string = "abcdefghijklmnopqrstuvwxyz"
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CharsUpper string = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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CharsNumbers string = "0123456789"
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// !#$%&'()*+,-./:;<=>?@[\]^_{|}~`"
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CharsSpecials string = "\x21\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x3a\x3b\x3c\x3d\x3e\x3f\x40\x5b\x5c\x5d\x5e\x5f\x7b\x7c\x7d\x7e\x60\x22"
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)
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const (
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argonMemory uint32 = 128 * 1024 // KiB
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argonIters uint32 = 8
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argonThreads uint8 = 3
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)
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type Params struct {
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PrivKey []byte
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Salt []byte
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Counter []byte // Actually it is a part of argon salt so let it be the same type
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PassLength uint32
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UseLower bool
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UseUpper bool
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UseNumbers bool
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UseSpecials bool
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}
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func (p *Params) GeneratePassword() (*string, error) {
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// TODO: Check PassLength <= MAX_UINT32/8
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var charSet string
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if ! (p.UseLower || p.UseUpper || p.UseNumbers || p.UseSpecials) {
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return nil, errors.New("Use at least one character group.")
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}
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if p.UseLower {
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charSet += CharsLower
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}
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if p.UseUpper {
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charSet += CharsUpper
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}
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if p.UseNumbers {
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charSet += CharsNumbers
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}
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if p.UseSpecials {
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charSet += CharsSpecials
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}
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dkey := argon2.IDKey(p.PrivKey, append(p.Counter, p.Salt...), argonIters, argonMemory, argonThreads, p.PassLength*8)
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password := ""
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for cn := 0; cn < len(dkey); cn += 8 {
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password += string(charSet[binary.BigEndian.Uint64(dkey[cn:cn+8])%uint64(len(charSet))])
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}
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return &password, nil
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}
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