Go加解密示例代码

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"fmt"
)

func Encrypt(plaintext, key []byte) ([]byte, error) {
	return EncryptWithIV(plaintext, key, []byte("0000000000000000"))
}

func EncryptWithIV(plaintext, key, iv []byte) ([]byte, error) {
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}

	// 检查IV长度
	if len(iv) != aes.BlockSize {
		return nil, fmt.Errorf("无效的IV长度，期望%d字节，实际%d字节", aes.BlockSize, len(iv))
	}

	// 添加PKCS#5填充
	plaintext = pkcs5Padding(plaintext, aes.BlockSize)

	// CBC模式加密
	mode := cipher.NewCBCEncrypter(block, iv)
	ciphertext := make([]byte, len(plaintext))
	mode.CryptBlocks(ciphertext, plaintext)

	return ciphertext, nil
}

func Decrypt(ciphertext, key []byte) ([]byte, error) {
	return DecryptWithIV(ciphertext, key, []byte("0000000000000000"))
}

func DecryptWithIV(ciphertext, key, iv []byte) ([]byte, error) {
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}

	// 检查IV长度
	if len(iv) != aes.BlockSize {
		return nil, fmt.Errorf("无效的IV长度，期望%d字节，实际%d字节", aes.BlockSize, len(iv))
	}

	// CBC模式解密
	mode := cipher.NewCBCDecrypter(block, iv)
	plaintext := make([]byte, len(ciphertext))
	mode.CryptBlocks(plaintext, ciphertext)

	// 移除PKCS#5填充
	return pkcs5Unpadding(plaintext), nil
}

// 添加PKCS#5填充
func pkcs5Padding(src []byte, blockSize int) []byte {
	padding := blockSize - len(src)%blockSize
	padtext := make([]byte, padding)
	for i := range padtext {
		padtext[i] = byte(padding)
	}
	return append(src, padtext...)
}

// 移除PKCS#5填充
func pkcs5Unpadding(src []byte) []byte {
	length := len(src)
	unpadding := int(src[length-1])
	return src[:(length - unpadding)]
}

func main() {
	keyBase64 := "Q2OWXUJMliSdRBkIZyKMlFkytQbeCQPYcrzRoAM2Wus="
	key, err := base64.StdEncoding.DecodeString(keyBase64)
	if err != nil {
		fmt.Printf("密钥解码错误: %v\n", err)
		return
	}
	
	fmt.Printf("密钥长度: %d 字节\n\n", len(key))
	
	source := []byte(`{"outerTradeNo":"D202410010000000004","realName":"凌小云","phone":"17666666666","idCard":"50000000001","idCardType":1,"payAccount":"17666666666","reason":"推广费用","balance":5.2,"bizAccount":"13888888888","taskId":1}`)
	
	// 加密
	ciphertext, err := Encrypt(source, key)
	if err != nil {
		fmt.Printf("加密错误: %v\n", err)
		return
	}
	
	
	ciphertextBase64 := base64.StdEncoding.EncodeToString(ciphertext)
	fmt.Printf("加密:\n%s\n\n", ciphertextBase64)

	// 解密
	decrypted, err := Decrypt(ciphertext, key)
	if err != nil {
		fmt.Printf("解密错误: %v\n", err)
		return
	}
	
	
	fmt.Printf("解密: \n%s\n\n", string(decrypted))
}