134 lines
3.1 KiB
Go
134 lines
3.1 KiB
Go
package util
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"errors"
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"fmt"
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"os"
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"io"
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"strings"
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"golang.org/x/crypto/bcrypt"
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)
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func SHA224String(password string) string {
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hash := sha256.New224()
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hash.Write([]byte(password))
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val := hash.Sum(nil)
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str := ""
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for _, v := range val {
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str += fmt.Sprintf("%02x", v)
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}
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return str
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}
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func HashPassword(password string) (string, error) {
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if len(strings.TrimSpace(password)) < 6 {
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return "", errors.New("password too short")
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}
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hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
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if err != nil {
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return "", err
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}
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return string(hash), nil
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}
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func IsBcryptHash(hash string) bool {
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return strings.HasPrefix(hash, "$2a$") || strings.HasPrefix(hash, "$2b$") || strings.HasPrefix(hash, "$2y$")
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}
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func VerifyPassword(password string, storedHash string) (ok bool, legacy bool) {
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if IsBcryptHash(storedHash) {
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err := bcrypt.CompareHashAndPassword([]byte(storedHash), []byte(password))
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return err == nil, false
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}
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return SHA224String(password) == storedHash, true
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}
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func HmacSHA256Hex(payload string, secret string) string {
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mac := hmac.New(sha256.New, []byte(secret))
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mac.Write([]byte(payload))
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sum := mac.Sum(nil)
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str := ""
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for _, v := range sum {
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str += fmt.Sprintf("%02x", v)
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}
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return str
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}
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func DecodeBase64Key(raw string, expectedLen int) ([]byte, error) {
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raw = strings.TrimSpace(raw)
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if raw == "" {
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return nil, errors.New("empty key")
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}
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decoded, err := base64.StdEncoding.DecodeString(raw)
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if err != nil {
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return nil, err
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}
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if len(decoded) != expectedLen {
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return nil, fmt.Errorf("invalid key length: expected %d, got %d", expectedLen, len(decoded))
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}
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return decoded, nil
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}
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func EncryptAESGCM(plainText string, key []byte) (string, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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cipherText := gcm.Seal(nil, nonce, []byte(plainText), nil)
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payload := append(nonce, cipherText...)
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return "v1:" + base64.StdEncoding.EncodeToString(payload), nil
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}
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func DecryptAESGCM(cipherText string, key []byte) (string, error) {
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if !strings.HasPrefix(cipherText, "v1:") {
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return "", errors.New("unsupported ciphertext version")
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}
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encoded := strings.TrimPrefix(cipherText, "v1:")
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payload, err := base64.StdEncoding.DecodeString(encoded)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonceSize := gcm.NonceSize()
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if len(payload) < nonceSize {
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return "", errors.New("invalid ciphertext")
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}
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nonce, enc := payload[:nonceSize], payload[nonceSize:]
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plain, err := gcm.Open(nil, nonce, enc, nil)
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if err != nil {
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return "", err
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}
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return string(plain), nil
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}
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func PeerSecretDigest(rawSecret string) string {
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secretKey := strings.TrimSpace(os.Getenv("HY2XS_PEER_SECRET_KEY"))
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if secretKey == "" {
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secretKey = "hy2xs-peer-secret-key"
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}
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return HmacSHA256Hex(rawSecret, secretKey)
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}
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