82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
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package passwd
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import (
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"crypto/hmac"
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"fmt"
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"github.com/openwall/yescrypt-go"
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"github.com/pedroalbanese/gogost/gost34112012256"
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)
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type GostYesCrypt struct {
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Passwd
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}
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// Make an MD5Crypt password instance.
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func NewGostYesCryptPasswd() PasswdInterface {
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m := new(GostYesCrypt)
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m.Magic = GOST_YES_CRYPT_MAGIC
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m.SetSCryptParams(11, 31)
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m.SaltLength = 22
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// Set the interface to allow parents to call overriden functions.
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m.i = m
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return m
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}
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// Sets the SCrypt params using integers.
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func (a *GostYesCrypt) SetSCryptParams(N, r int) (err error) {
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Nval, err := IToA64(N)
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if err != nil {
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return
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}
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rval, err := IToA64(r)
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if err != nil {
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return
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}
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a.Params = fmt.Sprintf("j%c%c", Nval, rval)
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return
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}
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// Decode SCrypt params.
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func (a *GostYesCrypt) DecodeSCriptParams() (N, r int) {
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b64 := []byte(a.Params)
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if len(b64) != 3 {
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return
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}
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N = AToI64(b64[1])
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r = AToI64(b64[2])
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return
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}
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// Hash a password with salt using gost yes crypt standard.
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func (a *GostYesCrypt) Hash(password []byte, salt []byte) (hash []byte, err error) {
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output := []byte(fmt.Sprintf("%s%s$%s", YES_CRYPT_MAGIC, a.Params, salt))
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yescryptHash, err := yescrypt.Hash(password, output)
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if err != nil {
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return
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}
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bytes := SCryptBase64Decode(yescryptHash[len(output)+1:])
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h := gost34112012256.New()
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h.Write(password)
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hmacKey := h.Sum(nil)
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settings := []byte(fmt.Sprintf("%s%s$%s", a.Magic, a.Params, salt))
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hm := hmac.New(gost34112012256.New, hmacKey)
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hm.Write(settings)
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hmacKey = hm.Sum(nil)
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hm = hmac.New(gost34112012256.New, hmacKey)
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hm.Write(bytes)
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b64 := SCryptBase64Encode(hm.Sum(nil))
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hash = append(settings, '$')
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hash = append(hash, b64...)
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return
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}
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// Override the passwd hash with salt function to hash with gost yes crypt.
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func (a *GostYesCrypt) HashPasswordWithSalt(password []byte, salt []byte) (hash []byte, err error) {
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hash, err = a.Hash(password, salt)
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return
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}
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