ocdp v1

backend/internal/pkg/password/password.go

@@ -0,0 +1,97 @@
+package password
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/base64"
+	"fmt"
+	"strings"
+	
+	"golang.org/x/crypto/argon2"
+)
+
+const (
+	// Argon2id 参数
+	memory      = 64 * 1024 // 64 MB
+	iterations  = 3
+	parallelism = 2
+	saltLength  = 16
+	keyLength   = 32
+)
+
+// Hasher 密码哈希器
+type Hasher struct{}
+
+// NewHasher 创建密码哈希器
+func NewHasher() *Hasher {
+	return &Hasher{}
+}
+
+// Hash 哈希密码（使用 Argon2id）
+func (h *Hasher) Hash(password string) (string, error) {
+	// 生成随机 salt
+	salt := make([]byte, saltLength)
+	if _, err := rand.Read(salt); err != nil {
+		return "", fmt.Errorf("failed to generate salt: %w", err)
+	}
+	
+	// 使用 Argon2id 哈希密码
+	hash := argon2.IDKey([]byte(password), salt, iterations, memory, parallelism, keyLength)
+	
+	// 编码为字符串格式: $argon2id$v=19$m=65536,t=3,p=2$salt$hash
+	b64Salt := base64.RawStdEncoding.EncodeToString(salt)
+	b64Hash := base64.RawStdEncoding.EncodeToString(hash)
+	
+	encodedHash := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
+		argon2.Version, memory, iterations, parallelism, b64Salt, b64Hash)
+	
+	return encodedHash, nil
+}
+
+// Verify 验证密码
+func (h *Hasher) Verify(password, encodedHash string) error {
+	// 解析编码的哈希
+	parts := strings.Split(encodedHash, "$")
+	if len(parts) != 6 {
+		return fmt.Errorf("invalid hash format")
+	}
+	
+	if parts[1] != "argon2id" {
+		return fmt.Errorf("unsupported algorithm: %s", parts[1])
+	}
+	
+	// 解析参数
+	var version int
+	var m, t, p uint32
+	_, err := fmt.Sscanf(parts[2], "v=%d", &version)
+	if err != nil {
+		return fmt.Errorf("failed to parse version: %w", err)
+	}
+	
+	_, err = fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &m, &t, &p)
+	if err != nil {
+		return fmt.Errorf("failed to parse parameters: %w", err)
+	}
+	
+	// 解码 salt 和 hash
+	salt, err := base64.RawStdEncoding.DecodeString(parts[4])
+	if err != nil {
+		return fmt.Errorf("failed to decode salt: %w", err)
+	}
+	
+	hash, err := base64.RawStdEncoding.DecodeString(parts[5])
+	if err != nil {
+		return fmt.Errorf("failed to decode hash: %w", err)
+	}
+	
+	// 使用相同参数哈希输入的密码
+	computedHash := argon2.IDKey([]byte(password), salt, t, m, uint8(p), uint32(len(hash)))
+	
+	// 使用常量时间比较防止时序攻击
+	if subtle.ConstantTimeCompare(hash, computedHash) == 1 {
+		return nil
+	}
+	
+	return fmt.Errorf("password does not match")
+}
+