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Open-IM-Server/pkg/utils/encryption .go

65 lines
1.5 KiB

2 years ago
package utils
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"encoding/hex"
"errors"
)
func Md5(s string, salt ...string) string {
h := md5.New()
h.Write([]byte(s))
if len(salt) > 0 {
h.Write([]byte(salt[0]))
}
cipher := h.Sum(nil)
return hex.EncodeToString(cipher)
}
func AesEncrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
encryptBytes := pkcs7Padding(data, blockSize)
crypted := make([]byte, len(encryptBytes))
blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
blockMode.CryptBlocks(crypted, encryptBytes)
return crypted, nil
}
func AesDecrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
crypted := make([]byte, len(data))
blockMode.CryptBlocks(crypted, data)
crypted, err = pkcs7UnPadding(crypted)
if err != nil {
return nil, err
}
return crypted, nil
}
func pkcs7Padding(data []byte, blockSize int) []byte {
padding := blockSize - len(data)%blockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(data, padText...)
}
func pkcs7UnPadding(data []byte) ([]byte, error) {
length := len(data)
if length == 0 {
return nil, errors.New("encrypt error")
}
unPadding := int(data[length-1])
return data[:(length - unPadding)], nil
}