Kyle Isom
286b886c06
- Argon2id password hashing and verification with configurable params - Bearer token generation (32-byte random), SHA-256 hashed storage, TTL-based expiry - User creation and authentication helpers - auth_tokens table added to migrations - 6 tests: hash/verify, wrong password, create/auth user, token create/validate, token expiry Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
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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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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type Argon2Params struct {
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Memory uint32
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Time uint32
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Threads uint8
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}
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var DefaultParams = Argon2Params{
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Memory: 65536,
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Time: 3,
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Threads: 4,
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}
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const saltLen = 16
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const keyLen = 32
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// HashPassword generates an Argon2id hash string.
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func HashPassword(password string, params Argon2Params) (string, error) {
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salt := make([]byte, saltLen)
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if _, err := rand.Read(salt); err != nil {
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return "", fmt.Errorf("generate salt: %w", err)
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}
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key := argon2.IDKey([]byte(password), salt, params.Time, params.Memory, params.Threads, keyLen)
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return fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version,
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params.Memory, params.Time, params.Threads,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(key),
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), nil
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}
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// VerifyPassword checks a password against an Argon2id hash string.
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func VerifyPassword(password, hash string) (bool, error) {
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parts := strings.Split(hash, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return false, fmt.Errorf("invalid hash format")
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}
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var v int
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if _, err := fmt.Sscanf(parts[2], "v=%d", &v); err != nil {
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return false, fmt.Errorf("parse version: %w", err)
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}
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var memory uint32
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var 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, fmt.Errorf("parse params: %w", err)
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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, fmt.Errorf("decode salt: %w", err)
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}
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expectedKey, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, fmt.Errorf("decode key: %w", err)
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}
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key := argon2.IDKey([]byte(password), salt, time, memory, threads, uint32(len(expectedKey)))
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return subtle.ConstantTimeCompare(key, expectedKey) == 1, nil
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}
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