62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Package auth : hachage de mots de passe (argon2id) et JWT.
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package auth
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import (
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"crypto/rand"
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"crypto/subtle"
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"encoding/base64"
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"errors"
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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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// Paramètres argon2id (OWASP Password Storage Cheat Sheet).
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const (
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argonTime = 1
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argonMemory = 64 * 1024 // 64 MiB
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argonThreads = 4
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argonKeyLen = 32
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argonSaltLen = 16
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)
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var ErrInvalidHash = errors.New("format de hash invalide")
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// HashPassword produit un hash argon2id encodé (format PHC).
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func HashPassword(password string) (string, error) {
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salt := make([]byte, argonSaltLen)
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if _, err := rand.Read(salt); err != nil {
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return "", err
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}
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key := argon2.IDKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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return fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version, argonMemory, argonTime, argonThreads,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(key),
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), nil
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}
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// VerifyPassword compare un mot de passe à un hash encodé, en temps constant.
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func VerifyPassword(password, encoded string) (bool, error) {
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parts := strings.Split(encoded, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return false, ErrInvalidHash
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}
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var memory, time uint32
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var threads uint8
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if _, err := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, &threads); err != nil {
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return false, ErrInvalidHash
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}
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salt, err := base64.RawStdEncoding.DecodeString(parts[4])
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if err != nil {
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return false, ErrInvalidHash
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}
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want, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, ErrInvalidHash
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}
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got := argon2.IDKey([]byte(password), salt, time, memory, threads, uint32(len(want)))
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return subtle.ConstantTimeCompare(got, want) == 1, nil
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}
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