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package token
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
)
// 加密 aes_128_cbc
func Encrypt(encryptStr string, key []byte, iv string) (string, error) {
encryptBytes := []byte(encryptStr)
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
blockSize := block.BlockSize()
encryptBytes = pkcs5Padding(encryptBytes, blockSize)
blockMode := cipher.NewCBCEncrypter(block, []byte(iv))
encrypted := make([]byte, len(encryptBytes))
blockMode.CryptBlocks(encrypted, encryptBytes)
return base64.URLEncoding.EncodeToString(encrypted), nil
}
// 解密
func Decrypt(decryptStr string, key []byte, iv string) (string, error) {
decryptBytes, err := base64.URLEncoding.DecodeString(decryptStr)
if err != nil {
return "", err
}
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
blockMode := cipher.NewCBCDecrypter(block, []byte(iv))
decrypted := make([]byte, len(decryptBytes))
blockMode.CryptBlocks(decrypted, decryptBytes)
decrypted = pkcs5UnPadding(decrypted)
return string(decrypted), nil
}
func pkcs5Padding(cipherText []byte, blockSize int) []byte {
padding := blockSize - len(cipherText)%blockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(cipherText, padText...)
}
func pkcs5UnPadding(decrypted []byte) []byte {
length := len(decrypted)
unPadding := int(decrypted[length-1])
return decrypted[:(length - unPadding)]
}