Go语言金融领域常用加密算法02国密SM4算法_golang sm4

Go语言金融领域常用加密算法02国密SM4算法

代码

package main

import (
	"bytes"
	"encoding/base64"
	"encoding/hex"
	"fmt"
	"github.com/tjfoc/gmsm/sm3"
	"github.com/tjfoc/gmsm/sm4"
	"strings"
)

// PKCSPadd填充算法
func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
	fmt.Printf("PKCS7Padding blockSize[%d]\n", blockSize)
	fmt.Printf("PKCS7Padding len(ciphertext)[%d]\n", len(ciphertext))
	padding := blockSize - len(ciphertext)%blockSize
	fmt.Printf("PKCS7Padding len(ciphertext) blockSize[%d]\n", len(ciphertext)%blockSize)

	padText := bytes.Repeat([]byte{byte(padding)}, padding)
	fmt.Println(padText)
	return append(ciphertext, padText...)
}

func PKCS7UnPadding(origData []byte) []byte {
	length := len(origData)
	fmt.Println(origData)
	fmt.Printf("PKCSUnPadding origData len %d\n", len(origData))
	unPadding := int(origData[length-1])
	fmt.Printf("PKCSUnPadding origData unPadding %d\n", unPadding)
	return origData[:(length - unPadding)]
}

func SM3main() {
	data := "test"
	h := sm3.New()
	h.Write([]byte(data))
	sum := h.Sum(nil)
	fmt.Printf("digest value is: %x\n", sum)
}

// 金融sm4加密ECB模式不填充，注意被加密数据必须为16个字节
func SM4ECBEncrypt(originalBytes, key []byte) ([]byte, error) {
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}
	fmt.Println("SM44ECBEncrypt block.BlockSize")

	//originalBytes = PKCS7Padding(originalBytes, block.BlockSize())

	if len(originalBytes) != 16 {
		fmt.Println("长度不是16")
		panic(err)
		return nil, err
	}

	cipherArr := make([]byte, len(originalBytes))
	block.Encrypt(cipherArr, originalBytes)
	return cipherArr, nil

}

// 金融sm4解密ECB模式不填充，注意被加密数据必须为16个字节
func SM4ECBDecrypt(originalBytes, key []byte) ([]byte, error) {
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}

	if len(originalBytes) != 16 {
		fmt.Println("长度不是16")
		panic(err)
		return nil, err
	}

	cipherArr := make([]byte, len(originalBytes))
	fmt.Println("SM44ECBDecrypt start")
	fmt.Println(originalBytes)
	block.Decrypt(cipherArr, originalBytes)
	//cipherArr = PKCS7UnPadding(cipherArr)

	fmt.Println("SM44ECBDecrypt end")
	return cipherArr, nil

}

func SM4ECBBase64Encrypt(originalText string, key []byte) (string, error) {
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}
	fmt.Println("SM44ECBBase64Encrypt originalText")
	fmt.Println("SM44ECBBase64Encrypt block.BlockSize")
	originalBytes := []byte(originalText)
	originalBytes = PKCS7Padding(originalBytes, block.BlockSize())
	fmt.Println(originalBytes)

	cipherArr := make([]byte, 0)
	cArr := make([]byte, 16)

	j := 0
	for i := 0; i < len(originalBytes)/16; i++ {
		original := originalBytes[j : j+16]
		block.Encrypt(cArr, original)
		cipherArr = append(cipherArr, cArr...)
		j = j + 16
	}

	fmt.Println("+++++++++++++++++++++++++++++++++++++")
	fmt.Println(cipherArr)
	base64Str := base64.StdEncoding.EncodeToString(cipherArr)
	return base64Str, nil

}

func SM4ECBBase64Decrypt(cipherText string, key []byte) (string, error) {
	cInArr, _ := base64.StdEncoding.DecodeString(cipherText)
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}
	fmt.Println("SM44ECBBase64Encrypt block.BlockSize")

	cipherArr := make([]byte, 0)
	cArr := make([]byte, 16)

	j := 0
	for i := 0; i < len(cInArr)/16; i++ {
		original := cInArr[j : j+16]
		block.Decrypt(cArr, original)
		cipherArr = append(cipherArr, cArr...)
		j = j + 16
	}

	fmt.Println("+++++++++++++++++++++++++++++++++++++")
	fmt.Println(cipherArr)
	originalText := string(PKCS7UnPadding(cipherArr))
	return originalText, nil

}

func SM4Main() {
	key, err := hex.DecodeString("11111111111111112222222222222222")

	fmt.Println(key)
	if err != nil {
		fmt.Println("key DecodeString err")
		panic(err)
		return
	}

	fmt.Println("===========================")
	arrStr, _ := hex.DecodeString("3343434324242424ABCDEF1234567890")
	resultArr, _ := SM4ECBEncrypt(arrStr, key)

	fmt.Println("SM4ECBEncrypt resultArr:")
	fmt.Println(resultArr)
	fmt.Println(strings.ToUpper(hex.EncodeToString(resultArr)))

	orgArr, _ := SM4ECBDecrypt(resultArr, key)
	fmt.Println("SM4ECBDecrypt resultArr:")
	fmt.Println(orgArr)
	fmt.Println(strings.ToUpper(hex.EncodeToString(orgArr)))

	fmt.Println("base64 sm4++++++++++++++++++++++++++")

	jsonStr := "{\"appId\":\"04\",\"appOrderNo\":\"0420230306000025358496\",\"appTranDt\":\"20230306162829\",\"balance\":\"010000001576280200000000000003000000000000040000000000000500000000000006000000000000070000000000000800000000000009000000000000\",\"bankDate\":\"20230306\",\"cardNo\":\"2168890040224279\",\"merchantId\":\"906110135120001\",\"merchantName\":\"T35120065\",\"respCode\":\"1001\",\"respMsg\":\"ss\",\"rrn\":\"306516354661\",\"terminalId\":\"35120065\"\",\"tranNo\":\"22422449523030616282802441875\",\"tranSn\":\"C0002023030616345701135111\",\"txnType\":\"CAP\",\"version\":\"1.0.0\"}"
	//jsonStr := "ewdewfecgvrtevgrgrcercfrcrfe454gg43t5g45"
	fmt.Println(jsonStr)
	resultStr, _ := SM4ECBBase64Encrypt(jsonStr, key)
	fmt.Println(resultStr)

	originalText, _ := SM4ECBBase64Decrypt(resultStr, key)
	fmt.Println(originalText)

}

func main() {
	//SM3main()
	SM4Main()
}

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