57 lines
1.5 KiB
Go
57 lines
1.5 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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// Argon2id 参数（OWASP 推荐基线）
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const (
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argonTime = 1
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argonMemory = 64 * 1024
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argonThreads = 4
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argonKeyLen = 32
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saltLen = 16
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)
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// HashPassword 生成 $argon2id$v=19$m=65536,t=1,p=4$salt$hash
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func HashPassword(password string) (string, error) {
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salt := make([]byte, saltLen)
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if _, err := rand.Read(salt); err != nil {
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return "", err
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}
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hash := argon2.IDKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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b64Salt := base64.RawStdEncoding.EncodeToString(salt)
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b64Hash := base64.RawStdEncoding.EncodeToString(hash)
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return fmt.Sprintf("$argon2id$v=19$m=%d,t=%d,p=%d$%s$%s", argonMemory, argonTime, argonThreads, b64Salt, b64Hash), nil
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}
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// VerifyPassword 校验密码（常数时间比较）
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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 {
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return false, fmt.Errorf("invalid hash format")
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}
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var memory uint32
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var timeCost 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, &timeCost, &threads); err != nil {
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return false, 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, err
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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, err
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}
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got := argon2.IDKey([]byte(password), salt, timeCost, memory, threads, uint32(len(want)))
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return subtle.ConstantTimeCompare(got, want) == 1, nil
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}
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