SM2算法加密解密
using Org.BouncyCastle.Asn1.GM;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Encoders;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace KFNets.Cool.BLL.Users.STDX
{
public class DXTEST
{
//实例化
public static string sm2()
{
string pukey = "";//公钥
string PRKEY = "";
var handle = new DXTEST(pukey, PRKEY, DXTEST.Mode.C1C3C2);
//加密
var ts = GetTimeStamp(DateTime.Now);// 时间戳
string str ="";//时间戳+openid
//sm2加密
var Encryptdata = handle.Encrypt(System.Text.Encoding.UTF8.GetBytes(str));
string datac = Hex.ToHexString(Encryptdata);
datac = "";//应用IP+SM2加密数据
//BASE64 加密
System.Text.Encoding encoding = System.Text.Encoding.GetEncoding("UTF-8");
byte[] buffer = encoding.GetBytes(datac);
datac = Convert.ToBase64String(buffer, Base64FormattingOptions.None);
var aa = System.Web.HttpUtility.UrlEncode(datac);
string result = System.Web.HttpUtility.UrlDecode(aa);
return result;
}
public static string GetTimeStamp(System.DateTime time)
{
long ts = ConvertDateTimeToInt(time);
return ts.ToString();
}
public static long ConvertDateTimeToInt(System.DateTime time)
{
System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
long t = (time.Ticks - startTime.Ticks) / 10000; //除10000调整为13位
return t;
}
public DXTEST(string pubkey, string privkey, Mode mode = Mode.C1C2C3, bool isPkcs8 = false)
{
if (pubkey != null)
this.pubkey = pubkey;
if (privkey != null)
this.privkey = privkey;
this.mode = mode;
}
string pubkey;
string privkey;
Mode mode;
ICipherParameters _privateKeyParameters;
ICipherParameters PrivateKeyParameters
{
get
{
try
{
var r = _privateKeyParameters;
if (r == null) r = _privateKeyParameters =
new ECPrivateKeyParameters(new BigInteger(privkey, 16),
new ECDomainParameters(GMNamedCurves.GetByName("SM2P256V1")));
return r;
}
catch (Exception ex)
{
return null;
}
}
}
ICipherParameters _publicKeyParameters;
ICipherParameters PublicKeyParameters
{
get
{
try
{
var r = _publicKeyParameters;
if (r == null)
{
//截取64字节有效的SM2公钥（如果公钥首个字节为0x04）
if (pubkey.Length > 128)
{
pubkey = pubkey.Substring(pubkey.Length - 128);
}
//将公钥拆分为x,y分量（各32字节）
String stringX = pubkey.Substring(0, 64);
String stringY = pubkey.Substring(stringX.Length);
//将公钥x、y分量转换为BigInteger类型
BigInteger x = new BigInteger(stringX, 16);
BigInteger y = new BigInteger(stringY, 16);
//通过公钥x、y分量创建椭圆曲线公钥规范
var x9ec = GMNamedCurves.GetByName("SM2P256V1");
r = _publicKeyParameters = new ECPublicKeyParameters(x9ec.Curve.CreatePoint(x, y),
new ECDomainParameters(x9ec));
}
return r;
}
catch (Exception ex)
{
return null;
;
}
}
}
public byte[] Decrypt(byte[] data)
{
try
{
if (mode == Mode.C1C3C2)
data = C132ToC123(data);
var sm2 = new SM2Engine();
sm2.Init(false, this.PrivateKeyParameters);
return sm2.ProcessBlock(data, 0, data.Length);
}
catch (Exception ex)
{
return null;
}
}
public byte[] Encrypt(byte[] data)
{
try
{
// var sm2 = new SM2Engine(new SM3Digest());
var sm2 = new SM2Engine();
sm2.Init(true, new ParametersWithRandom(this.PublicKeyParameters));
data = sm2.ProcessBlock(data, 0, data.Length);
if (mode == Mode.C1C3C2)
data = C123ToC132(data);
return data;
}
catch (Exception ex)
{
return null;
}
}
static byte[] C123ToC132(byte[] c1c2c3)
{
var gn = GMNamedCurves.GetByName("SM2P256V1");
int c1Len = (gn.Curve.FieldSize + 7) / 8 * 2 + 1;
int c3Len = 32;
byte[] result = new byte[c1c2c3.Length];
Array.Copy(c1c2c3, 0, result, 0, c1Len); //c1
Array.Copy(c1c2c3, c1c2c3.Length - c3Len, result, c1Len, c3Len); //c3
Array.Copy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.Length - c1Len - c3Len); //c2
return result;
}
static byte[] C132ToC123(byte[] c1c3c2)
{
var gn = GMNamedCurves.GetByName("SM2P256V1");
int c1Len = (gn.Curve.FieldSize + 7) / 8 * 2 + 1;
int c3Len = 32;
byte[] result = new byte[c1c3c2.Length];
Array.Copy(c1c3c2, 0, result, 0, c1Len); //c1: 0->65
Array.Copy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.Length - c1Len - c3Len); //c2
Array.Copy(c1c3c2, c1Len, result, c1c3c2.Length - c3Len, c3Len); //c3
return result;
}
public enum Mode
{
C1C2C3, C1C3C2
}
}
}