71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package utils
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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"errors"
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)
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func pkcs7Padding(data []byte, blockSize int) []byte {
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padding := blockSize - len(data)%blockSize
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padText := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(data, padText...)
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}
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func pkcs7UnPadding(data []byte) ([]byte, error) {
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length := len(data)
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if length == 0 {
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return nil, errors.New("加密字符串为空！")
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}
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unPadding := int(data[length-1])
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return data[:(length - unPadding)], nil
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}
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func aesEncrypt(data []byte, key []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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blockSize := block.BlockSize()
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encryptBytes := pkcs7Padding(data, blockSize)
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encrypted := make([]byte, len(encryptBytes))
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blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
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blockMode.CryptBlocks(encrypted, encryptBytes)
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return encrypted, nil
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}
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func aesDecrypt(data []byte, key []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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blockSize := block.BlockSize()
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blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
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decrypted := make([]byte, len(data))
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blockMode.CryptBlocks(decrypted, data)
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//fmt.Println(data, decrypted)
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decrypted, err = pkcs7UnPadding(decrypted)
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if err != nil {
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return nil, err
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}
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return decrypted, err
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}
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func EncryptByAes(data []byte, key []byte) (string, error) {
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res, err := aesEncrypt(data, key)
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if err != nil {
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return "", err
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}
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return base64.StdEncoding.EncodeToString(res), nil
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}
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func DecryptByAes(data string, key []byte) ([]byte, error) {
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dataByte, err := base64.StdEncoding.DecodeString(data)
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if err != nil {
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return nil, err
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}
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return aesDecrypt(dataByte, key)
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}
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