91 lines
2.4 KiB
Go
91 lines
2.4 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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"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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// Argon2 参数（DEVELOPMENT 第 12 节 / OWASP 最低配置）。
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const (
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ArgonMemoryKiB = 19 * 1024 // 19 MiB
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ArgonTime = 2
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ArgonThreads = 1
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ArgonKeyLen = 32
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ArgonSaltLen = 16
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)
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// ErrInvalidPHC 表示 PHC 字符串无法解析或参数不支持。
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var ErrInvalidPHC = errors.New("auth: invalid phc")
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// HashPassword 用 argon2id 生成 PHC 字符串（不含并发池；池见 HashPool）。
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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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hash := argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemoryKiB, ArgonThreads, ArgonKeyLen)
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return encodePHC(salt, hash), nil
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}
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// VerifyPassword 常量时间比较密码与 PHC；不匹配时 ok=false 且 err=nil。
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func VerifyPassword(password, phc string) (bool, error) {
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salt, hash, err := decodePHC(phc)
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if err != nil {
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return false, err
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}
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got := argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemoryKiB, ArgonThreads, ArgonKeyLen)
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if subtle.ConstantTimeCompare(got, hash) == 1 {
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return true, nil
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}
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return false, nil
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}
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func encodePHC(salt, hash []byte) string {
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return fmt.Sprintf(
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"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version,
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ArgonMemoryKiB,
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ArgonTime,
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ArgonThreads,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(hash),
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)
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}
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func decodePHC(phc string) (salt, hash []byte, err error) {
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// $argon2id$v=19$m=19456,t=2,p=1$salt$hash
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parts := strings.Split(phc, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return nil, nil, ErrInvalidPHC
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}
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var version int
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if _, scanErr := fmt.Sscanf(parts[2], "v=%d", &version); scanErr != nil || version != argon2.Version {
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return nil, nil, ErrInvalidPHC
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}
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var m, t, p int
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if _, scanErr := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &m, &t, &p); scanErr != nil {
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return nil, nil, ErrInvalidPHC
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}
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if m != ArgonMemoryKiB || t != ArgonTime || p != ArgonThreads {
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return nil, nil, ErrInvalidPHC
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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 nil, nil, ErrInvalidPHC
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}
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hash, err = base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return nil, nil, ErrInvalidPHC
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}
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if len(salt) == 0 || len(hash) == 0 {
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return nil, nil, ErrInvalidPHC
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}
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return salt, hash, nil
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}
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