Golang AES CBC 加密

xiaoxiao2021-02-28  7

package main import ( "bytes" "crypto/aes" "crypto/cipher" "encoding/base64" "fmt" ) const ( key = "2018201820182018" iv = "1234567887654321" ) func main() { str := "我勒个去" es, _ := AesEncrypt(str, []byte(key)) fmt.Println(es) ds, _ := AesDecrypt(es, []byte(key)) fmt.Println(string(ds)) } func AesEncrypt(encodeStr string, key []byte) (string, error) { encodeBytes := []byte(encodeStr) //根据key 生成密文 block, err := aes.NewCipher(key) if err != nil { return "", err } blockSize := block.BlockSize() encodeBytes = PKCS5Padding(encodeBytes, blockSize) blockMode := cipher.NewCBCEncrypter(block, []byte(iv)) crypted := make([]byte, len(encodeBytes)) blockMode.CryptBlocks(crypted, encodeBytes) return base64.StdEncoding.EncodeToString(crypted), nil } func PKCS5Padding(ciphertext []byte, blockSize int) []byte { padding := blockSize - len(ciphertext)%blockSize //填充 padtext := bytes.Repeat([]byte{byte(padding)}, padding) return append(ciphertext, padtext...) } func AesDecrypt(decodeStr string, key []byte) ([]byte, error) { //先解密base64 decodeBytes, err := base64.StdEncoding.DecodeString(decodeStr) if err != nil { return nil, err } block, err := aes.NewCipher(key) if err != nil { return nil, err } blockMode := cipher.NewCBCDecrypter(block, []byte(iv)) origData := make([]byte, len(decodeBytes)) blockMode.CryptBlocks(origData, decodeBytes) origData = PKCS5UnPadding(origData) return origData, nil } func PKCS5UnPadding(origData []byte) []byte { length := len(origData) unpadding := int(origData[length-1]) return origData[:(length - unpadding)] }
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