57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package tools
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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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"errors"
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"log"
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)
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func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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func PKCS5UnPadding(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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if length < unpadding {
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return []byte("")
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}
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log.Println(origData, length, unpadding)
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return origData[:(length - unpadding)]
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}
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func AesEncrypt(origData, 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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origData = PKCS5Padding(origData, blockSize)
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blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
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crypted := make([]byte, len(origData))
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blockMode.CryptBlocks(crypted, origData)
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return crypted, nil
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}
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func AesDecrypt(crypted, 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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origData := make([]byte, len(crypted))
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blockMode.CryptBlocks(origData, crypted)
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if len(origData) <= 0 {
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return nil, errors.New("crypted faild")
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}
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origData = PKCS5UnPadding(origData)
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return origData, nil
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}
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