79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
package shared
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import (
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"bytes"
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"crypto/rand"
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"encoding/base64"
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"errors"
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"golang.org/x/crypto/argon2"
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"runtime"
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"strings"
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)
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type Hash struct {
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Hash []byte
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Salt []byte
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}
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func (h *Hash) String() string {
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return base64.StdEncoding.EncodeToString(h.Salt) + ";" + base64.StdEncoding.EncodeToString(h.Hash)
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}
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func NewHash(pass string, salt []byte) (hash *Hash, err error) {
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if salt == nil {
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salt = make([]byte, 16)
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_, err = rand.Read(salt)
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if err != nil {
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return nil, err
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}
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}
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var parallelism uint8
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if runtime.NumCPU() > 255 {
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parallelism = 255
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} else {
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parallelism = uint8(runtime.NumCPU()) // #nosec G115 -- False positive, if this does happen, blame radiation.
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}
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argonHash := argon2.IDKey([]byte(pass), salt, 6, 64*1024, parallelism, 45)
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return &Hash{
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Salt: salt,
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Hash: argonHash,
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}, nil
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}
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var ErrInvalidHashStr = errors.New("invalid hash string")
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func CompareHash(hash string, pass string) (matches bool, err error) {
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hashSplit := strings.Split(hash, ";")
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if len(hashSplit) != 2 {
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return false, ErrInvalidHashStr
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}
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salt, err := base64.StdEncoding.DecodeString(hashSplit[0])
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if err != nil {
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return false, err
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}
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decodedHash, err := base64.StdEncoding.DecodeString(hashSplit[1])
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if err != nil {
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return false, err
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}
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hashInfo, err := NewHash(pass, salt)
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if err != nil {
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return false, err
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}
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if !bytes.Equal(decodedHash, hashInfo.Hash) {
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return false, nil
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}
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return true, nil
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}
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