root
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package auth
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"crypto/subtle"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"golang.org/x/crypto/argon2"
|
|
)
|
|
|
|
type passwordConfig struct {
|
|
time uint32
|
|
memory uint32
|
|
threads uint8
|
|
keyLen uint32
|
|
saltLen uint32
|
|
}
|
|
|
|
var defaultParams = passwordConfig{
|
|
time: 3,
|
|
memory: 64 * 1024,
|
|
threads: 4,
|
|
keyLen: 32,
|
|
saltLen: 16,
|
|
}
|
|
|
|
// HashPassword returns an Argon2id encoded string.
|
|
func HashPassword(password string) (string, error) {
|
|
salt := make([]byte, defaultParams.saltLen)
|
|
if _, err := rand.Read(salt); err != nil {
|
|
return "", fmt.Errorf("generate salt: %w", err)
|
|
}
|
|
|
|
hash := argon2.IDKey([]byte(password), salt, defaultParams.time, defaultParams.memory, defaultParams.threads, defaultParams.keyLen)
|
|
|
|
b64Salt := base64.RawStdEncoding.EncodeToString(salt)
|
|
b64Hash := base64.RawStdEncoding.EncodeToString(hash)
|
|
|
|
encodedHash := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s", argon2.Version, defaultParams.memory, defaultParams.time, defaultParams.threads, b64Salt, b64Hash)
|
|
return encodedHash, nil
|
|
}
|
|
|
|
// VerifyPassword compares a password against an encoded Argon2id hash.
|
|
func VerifyPassword(password, encodedHash string) (bool, error) {
|
|
parts := strings.Split(encodedHash, "$")
|
|
if len(parts) != 6 {
|
|
return false, fmt.Errorf("invalid hash format")
|
|
}
|
|
|
|
var version int
|
|
_, err := fmt.Sscanf(parts[2], "v=%d", &version)
|
|
if err != nil {
|
|
return false, fmt.Errorf("parse version: %w", err)
|
|
}
|
|
|
|
var memory, time uint32
|
|
var threads uint8
|
|
_, err = fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, &threads)
|
|
if err != nil {
|
|
return false, fmt.Errorf("parse params: %w", err)
|
|
}
|
|
|
|
decodedSalt, err := base64.RawStdEncoding.DecodeString(parts[4])
|
|
if err != nil {
|
|
return false, fmt.Errorf("decode salt: %w", err)
|
|
}
|
|
|
|
decodedHash, err := base64.RawStdEncoding.DecodeString(parts[5])
|
|
if err != nil {
|
|
return false, fmt.Errorf("decode hash: %w", err)
|
|
}
|
|
|
|
computed := argon2.IDKey([]byte(password), decodedSalt, time, memory, threads, uint32(len(decodedHash)))
|
|
|
|
if subtle.ConstantTimeCompare(computed, decodedHash) == 1 {
|
|
return true, nil
|
|
}
|
|
return false, nil
|
|
}
|