112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package common
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"golang.org/x/crypto/scrypt"
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"io"
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"log"
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"strconv"
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"strings"
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"time"
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)
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func Hash(password, salt string) (string, error) {
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passwordBytes := []byte(password)
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saltBytes := []byte(salt)
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derivedKey, err := scrypt.Key(passwordBytes, saltBytes, 32768, 8, 1, 64)
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if err != nil {
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log.Println("[ERROR] Unknown in hash() at", strconv.FormatInt(time.Now().Unix(), 10)+":", err)
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return "", err
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}
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hashString := fmt.Sprintf("scrypt:32768:8:1$%s$%s", salt, hex.EncodeToString(derivedKey))
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return hashString, nil
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}
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func VerifyHash(werkzeugHash, password string) (bool, error) {
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parts := strings.Split(werkzeugHash, "$")
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if len(parts) != 3 || parts[0] != "scrypt:32768:8:1" {
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return false, errors.New("invalid hash format")
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}
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salt := parts[1]
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computedHash, err := Hash(password, salt)
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if err != nil {
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return false, err
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}
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return werkzeugHash == computedHash, nil
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}
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func DecryptAES(key, ciphertext []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, 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 nil, err
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}
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if len(ciphertext) < gcm.NonceSize() {
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return nil, errors.New("ciphertext too short")
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}
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nonce := ciphertext[:gcm.NonceSize()]
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ciphertext = ciphertext[gcm.NonceSize():]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plaintext, nil
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}
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func EncryptAES(key, text []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, 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 nil, 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 nil, err
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}
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ciphertext := gcm.Seal(nonce, nonce, text, nil)
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return ciphertext, nil
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}
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func GenSalt(length int) (string, error) {
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saltChars := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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if length <= 0 {
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return "", errors.New("invalid length")
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}
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salt := make([]byte, length)
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randomBytes := make([]byte, length)
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_, err := rand.Read(randomBytes)
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if err != nil {
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return "", err
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}
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for i := range salt {
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salt[i] = saltChars[int(randomBytes[i])%len(saltChars)]
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}
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return string(salt), nil
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}
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