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fuenmao
2025-09-29 13:48:36 +08:00
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SimpleAdmin.Core/Utils/Cryptogram/Sm/SM2CryptoUtil.cs
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// Copyright (c) 2022-Now 少林寺驻北固山办事处大神父王喇嘛
//
// SimpleAdmin 基于 Apache License Version 2.0 协议发布，可用于商业项目，但必须遵守以下补充条款:
// 1.请不要删除和修改根目录下的LICENSE文件。
// 2.请不要删除和修改SimpleAdmin源码头部的版权声明。
// 3.分发源码时候，请注明软件出处 https://gitee.com/dotnetmoyu/SimpleAdmin
// 4.基于本软件的作品，只能使用 SimpleAdmin 作为后台服务，除外情况不可商用且不允许二次分发或开源。
// 5.请不得将本软件应用于危害国家安全、荣誉和利益的行为，不能以任何形式用于非法为目的的行为。
// 6.任何基于本软件而产生的一切法律纠纷和责任，均于我司无关。
namespace SimpleAdmin.Core.Utils;
/// <summary>
/// SM2工具类
/// </summary>
public class SM2CryptoUtil
{
#region 获取公钥私钥
/// <summary>
/// 获取公钥私钥
/// </summary>
/// <returns></returns>
public static SM2Model GetKey()
{
var sm2 = SM2.Instance;
var key = sm2.ecc_key_pair_generator.GenerateKeyPair();
var ecpriv = (ECPrivateKeyParameters)key.Private;
var ecpub = (ECPublicKeyParameters)key.Public;
var privateKey = ecpriv.D;
var publicKey = ecpub.Q;
var sM2Model = new SM2Model();
sM2Model.PrivateKey = Encoding.UTF8.GetString(Hex.Encode(privateKey.ToByteArray())).ToUpper();
sM2Model.PublicKey = Encoding.UTF8.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper();
return sM2Model;
}
#endregion 获取公钥私钥
#region 加密
/// <summary>
/// 加密
/// </summary>
/// <param name="publickey">公钥</param>
/// <param name="sourceData">需要加密的值</param>
/// <returns>加密结果</returns>
public static string Encrypt(string publickey, string sourceData)
{
var data = Encrypt(Hex.Decode(publickey), Encoding.UTF8.GetBytes(sourceData));
return data;
}
/// <summary>
/// 加密
/// </summary>
/// <param name="publicKey">公钥</param>
/// <param name="data">需要加密的值</param>
/// <returns></returns>
public static string Encrypt(byte[] publicKey, byte[] data)
{
if (null == publicKey || publicKey.Length == 0)
{
return null;
}
if (data == null || data.Length == 0)
{
return null;
}
var source = new byte[data.Length];
Array.Copy(data, 0, source, 0,
data.Length);
var cipher = new Cipher();
var sm2 = SM2.Instance;
var userKey = sm2.ecc_curve.DecodePoint(publicKey);
var c1 = cipher.Init_enc(sm2, userKey);
cipher.Encrypt(source);
var c3 = new byte[32];
cipher.Dofinal(c3);
var sc1 = Encoding.UTF8.GetString(Hex.Encode(c1.GetEncoded()));
var sc2 = Encoding.UTF8.GetString(Hex.Encode(source));
var sc3 = Encoding.UTF8.GetString(Hex.Encode(c3));
return (sc1 + sc2 + sc3).ToUpper();
}
#endregion 加密
#region 解密
/// <summary>
///
/// </summary>
/// <param name="privateKey"></param>
/// <param name="encryptedData"></param>
/// <returns></returns>
public static string Decrypt(string privateKey, string encryptedData)
{
var data = Encoding.UTF8.GetString(Decrypt(Hex.Decode(privateKey), Hex.Decode(encryptedData)));
return data;
}
/// <summary>
/// 解密
/// </summary>
/// <param name="privateKey"></param>
/// <param name="encryptedData"></param>
/// <returns></returns>
public static byte[] Decrypt(byte[] privateKey, byte[] encryptedData)
{
if (null == privateKey || privateKey.Length == 0)
{
return null;
}
if (encryptedData == null || encryptedData.Length == 0)
{
return null;
}
var data = Encoding.UTF8.GetString(Hex.Encode(encryptedData));
var c1Bytes = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(0, 130)));
var c2Len = encryptedData.Length - 97;
var c2 = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(130, 2 * c2Len)));
var c3 = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(130 + 2 * c2Len, 64)));
var sm2 = SM2.Instance;
var userD = new BigInteger(1, privateKey);
//ECPoint c1 = sm2.ecc_curve.DecodePoint(c1Bytes);
var c1 = sm2.ecc_curve.DecodePoint(c1Bytes);
var cipher = new Cipher();
cipher.Init_dec(userD, c1);
cipher.Decrypt(c2);
cipher.Dofinal(c3);
return c2;
}
#endregion 解密
private class Cipher
{
private int ct;
private ECPoint p2;
private SM3Digest sm3keybase;
private SM3Digest sm3c3;
private byte[] key;
private byte keyOff;
public Cipher()
{
ct = 1;
key = new byte[32];
keyOff = 0;
}
public static byte[] byteConvert32Bytes(BigInteger n)
{
byte[] tmpd;
if (n == null)
{
return null;
}
if (n.ToByteArray().Length == 33)
{
tmpd = new byte[32];
Array.Copy(n.ToByteArray(), 1, tmpd, 0,
32);
}
else if (n.ToByteArray().Length == 32)
{
tmpd = n.ToByteArray();
}
else
{
tmpd = new byte[32];
for (var i = 0; i < 32 - n.ToByteArray().Length; i++)
{
tmpd[i] = 0;
}
Array.Copy(n.ToByteArray(), 0, tmpd, 32 - n.ToByteArray().Length,
n.ToByteArray().Length);
}
return tmpd;
}
private void Reset()
{
sm3keybase = new SM3Digest();
sm3c3 = new SM3Digest();
var p = byteConvert32Bytes(p2.Normalize().XCoord.ToBigInteger());
sm3keybase.BlockUpdate(p, 0, p.Length);
sm3c3.BlockUpdate(p, 0, p.Length);
p = byteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger());
sm3keybase.BlockUpdate(p, 0, p.Length);
ct = 1;
NextKey();
}
private void NextKey()
{
var sm3keycur = new SM3Digest(sm3keybase);
sm3keycur.Update((byte)(ct >> 24 & 0xff));
sm3keycur.Update((byte)(ct >> 16 & 0xff));
sm3keycur.Update((byte)(ct >> 8 & 0xff));
sm3keycur.Update((byte)(ct & 0xff));
sm3keycur.DoFinal(key, 0);
keyOff = 0;
ct++;
}
public ECPoint Init_enc(SM2 sm2, ECPoint userKey)
{
var key = sm2.ecc_key_pair_generator.GenerateKeyPair();
var ecpriv = (ECPrivateKeyParameters)key.Private;
var ecpub = (ECPublicKeyParameters)key.Public;
var k = ecpriv.D;
var c1 = ecpub.Q;
p2 = userKey.Multiply(k);
Reset();
return c1;
}
public void Encrypt(byte[] data)
{
sm3c3.BlockUpdate(data, 0, data.Length);
for (var i = 0; i < data.Length; i++)
{
if (keyOff == key.Length)
{
NextKey();
}
data[i] ^= key[keyOff++];
}
}
public void Init_dec(BigInteger userD, ECPoint c1)
{
p2 = c1.Multiply(userD);
Reset();
}
public void Decrypt(byte[] data)
{
for (var i = 0; i < data.Length; i++)
{
if (keyOff == key.Length)
{
NextKey();
}
data[i] ^= key[keyOff++];
}
sm3c3.BlockUpdate(data, 0, data.Length);
}
public void Dofinal(byte[] c3)
{
var p = byteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger());
sm3c3.BlockUpdate(p, 0, p.Length);
sm3c3.DoFinal(c3, 0);
Reset();
}
}
private class SM2
{
public static SM2 Instance
{
get
{
return new SM2();
}
}
public static SM2 InstanceTest
{
get
{
return new SM2();
}
}
public static readonly string[] sm2_param =
{
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",// p,0
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",// a,1
"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",// b,2
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",// n,3
"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",// gx,4
"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"// gy,5
};
public string[] ecc_param = sm2_param;
public readonly BigInteger ecc_p;
public readonly BigInteger ecc_a;
public readonly BigInteger ecc_b;
public readonly BigInteger ecc_n;
public readonly BigInteger ecc_gx;
public readonly BigInteger ecc_gy;
public readonly ECCurve ecc_curve;
public readonly ECPoint ecc_point_g;
public readonly ECDomainParameters ecc_bc_spec;
public readonly ECKeyPairGenerator ecc_key_pair_generator;
private SM2()
{
ecc_param = sm2_param;
ECFieldElement ecc_gx_fieldelement;
ECFieldElement ecc_gy_fieldelement;
ecc_p = new BigInteger(ecc_param[0], 16);
ecc_a = new BigInteger(ecc_param[1], 16);
ecc_b = new BigInteger(ecc_param[2], 16);
ecc_n = new BigInteger(ecc_param[3], 16);
ecc_gx = new BigInteger(ecc_param[4], 16);
ecc_gy = new BigInteger(ecc_param[5], 16);
ecc_gx_fieldelement = new FpFieldElement(ecc_p, ecc_gx);
ecc_gy_fieldelement = new FpFieldElement(ecc_p, ecc_gy);
ecc_curve = new FpCurve(ecc_p, ecc_a, ecc_b);
ecc_point_g = new FpPoint(ecc_curve, ecc_gx_fieldelement, ecc_gy_fieldelement);
ecc_bc_spec = new ECDomainParameters(ecc_curve, ecc_point_g, ecc_n);
ECKeyGenerationParameters ecc_ecgenparam;
ecc_ecgenparam = new ECKeyGenerationParameters(ecc_bc_spec, new SecureRandom());
ecc_key_pair_generator = new ECKeyPairGenerator();
ecc_key_pair_generator.Init(ecc_ecgenparam);
}
public virtual byte[] Sm2GetZ(byte[] userId, ECPoint userKey)
{
var sm3 = new SM3Digest();
byte[] p;
// userId length
var len = userId.Length * 8;
sm3.Update((byte)(len >> 8 & 0x00ff));
sm3.Update((byte)(len & 0x00ff));
// userId
sm3.BlockUpdate(userId, 0, userId.Length);
// a,b
p = ecc_a.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = ecc_b.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
// gx,gy
p = ecc_gx.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = ecc_gy.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
// x,y
p = userKey.AffineXCoord.ToBigInteger().ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = userKey.AffineYCoord.ToBigInteger().ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
// Z
var md = new byte[sm3.GetDigestSize()];
sm3.DoFinal(md, 0);
return md;
}
}
public class SM2Model
{
/// <summary>
/// 公钥
/// </summary>
public string PublicKey { get; set; }
/// <summary>
/// 私钥
/// </summary>
public string PrivateKey { get; set; }
}
}