https://www.jianshu.com/p/7a4c8b75c7cf
C# “国密加密算法”SM系列的C#实现方法 - 修改版
0.0962018.08.28 15:51:40字数 135阅读 4,025
http://www.zhimengzhe.com/bianchengjiaocheng/Javabiancheng/22144.html
在网上搜索SM实现方法，按照上面网站提供方法总是出错，经过调试终于修改好了，给大家以参考，不走弯路了
base64修改，这个看需求，如果不需要base64格式，可以不修改，但是下面要把 “i” 修改成 “j”，这个可能是原作者写错了，我这里修改一下，然后做记录，然后再把完整的贴出来
QQ截图20180828153311.png
using Org.BouncyCastle.Utilities.Encoders;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Web;
namespace Common
{
class SM4Utils
{
public string secretKey = "";
public string iv = "";
public bool hexString = false;
public string Encrypt_ECB(string plainText)
{
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_ENCRYPT;
byte[] keyBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
}
else
{
keyBytes = Encoding.Default.GetBytes(secretKey);
}
SM4 sm4 = new SM4();
sm4.sm4_setkey_enc(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_ecb(ctx, Encoding.Default.GetBytes(plainText));
string cipherText = Encoding.Default.GetString(Hex.Encode(encrypted));
return cipherText;
}
public string Decrypt_ECB(string cipherText)
{
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_DECRYPT;
byte[] keyBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
}
else
{
keyBytes = Encoding.Default.GetBytes(secretKey);
}
SM4 sm4 = new SM4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
return Encoding.Default.GetString(decrypted);
}
public string Encrypt_CBC(string plainText)
{
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_ENCRYPT;
byte[] keyBytes;
byte[] ivBytes