/
otp.go
57 lines (46 loc) · 1.28 KB
/
otp.go
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// Package otp
//
// @author: xwc1125
package otp
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"io"
"golang.org/x/crypto/pbkdf2"
"golang.org/x/crypto/sha3"
)
// EncryptTOTP 加密totp
func EncryptTOTP(password []byte, salt []byte, totp []byte) ([]byte, error) {
dk := pbkdf2.Key(password, salt, 10000, 32, sha3.New256)
block, err := aes.NewCipher(dk)
if err != nil {
return nil, err
}
ciphertext := make([]byte, aes.BlockSize+len(totp))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], totp)
return []byte(base64.URLEncoding.EncodeToString(ciphertext)), nil
}
// DecryptTOTP 解密totp
func DecryptTOTP(password []byte, salt []byte, totp string) (string, error) {
dk := pbkdf2.Key(password, salt, 10000, 32, sha3.New256)
ciphertext, _ := base64.URLEncoding.DecodeString(totp)
block, err := aes.NewCipher(dk)
if err != nil {
return "", err
}
if len(ciphertext) < aes.BlockSize {
return "", err
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
stream.XORKeyStream(ciphertext, ciphertext)
return string(ciphertext), nil
}