/// <summary>
/// 公钥加密算法，利用下一个用户的公钥进行加密
/// </summary>
/// <param name="sm2">sm2对象</param>
/// <param name="msg">要加密的消息</param>
/// <param name="ppk">目的签名者的公钥文件夹路径</param>
/// <param name="id">加密后消息存入的文件夹（最好不存起来）</param>
public string[] Test_sm2_cipher(SM2 sm2, string msg, string ppk)
{
byte[] data = Encoding.Default.GetBytes(msg);//将信息转化为比特
// 加密过程
ECPoint userKey = null;
byte[] key = null;
ReadpublicKey(out key, ppk); //读取解密者的公钥
userKey = sm2.ecc_curve.DecodePoint(key); //把字节形的转化为Ecpoint
System.String sdata = new UTF8Encoding().GetString(Hex.Encode(data));
SM2.Cipher cipher = new SM2.Cipher();
ECPoint c1 = cipher.Init_enc(sm2, userKey); //调用Init_enc方法
byte[] bc1 = c1.GetEncoded(); //将c1的数据类型转换成比特串
System.String sbc1 = new UTF8Encoding().GetString(Hex.Encode(bc1));
cipher.Encrypt(data);
System.String sc2 = new UTF8Encoding().GetString(Hex.Encode(data));
byte[] c3 = new byte[32];
cipher.Dofinal(c3);
System.String sc3 = new UTF8Encoding().GetString(Hex.Encode(c3));
string[] cc = { sbc1, sc2, sc3 };
return(cc);
}
/// <summary>
/// 私钥解密算法
/// </summary>
/// <param name="sm2">sm2对象</param>
/// <param name="pripk">自己的私钥</param>
/// <param name="id">id</param>
/// <returns></returns>
public string deciphering(SM2 sm2, string pripk, string mc1, string sc2, string mc3)
{
byte[] bc1 = new byte[32];
BigInteger userD = null;
// String sc2 = null;
byte[] c3 = new byte[32];
byte[] data;
bc1 = strToToHexByte(mc1);
c3 = strToToHexByte(mc3);
Readprikey(out userD, pripk);
// 解密过程
SM2.Cipher cipher = new SM2.Cipher();
cipher = new SM2.Cipher();
ECPoint c1 = sm2.ecc_curve.DecodePoint(bc1);
data = strToToHexByte(sc2);
cipher.Init_dec(userD, c1); //调用Init_dec,从c中取出比特串c1,将c1的数据类型转化为椭圆曲线上的点，如果不满足椭圆曲线上的点则报错。
cipher.Decrypt(data); //调用Decrypt方法
//System.String sdata1 = new UTF8Encoding().GetString(Hex.Encode(data));
string sdata = System.Text.Encoding.Default.GetString(data);
System.String sc3 = new UTF8Encoding().GetString(Hex.Encode(c3));
byte[] c3_ = new byte[32];
cipher.Dofinal(c3_);
System.String sc3_ = new UTF8Encoding().GetString(Hex.Encode(c3_));
//数据校验检测数据是否被篡改或丢失
if (sc3_.ToUpper().Equals(sc3.ToUpper()))//sc3_==sc3
{
return(sdata);
}
else
{
// System.Console.Out.WriteLine("数据校验失败!\n");//sc3_!=sc3
return("0");
}
}