- A+
SM2是国家密码管理局于2010年12月17日发布的椭圆曲线公钥密码算法。
产生背景：
在.NET中的使用：
本次介绍使用第三方密码库BouncyCastle实现SM2加解密，使用NuGet搜索BouncyCastle.Cryptography点击安装即可。
1.引入命名空间
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Security;
2.生成SM2密钥对
/// <summary>
/// 生成SM2密钥对,密钥对使用Base64进行编码
/// </summary>
/// <returns>PrivateKey:私钥，PublicKey:公钥</returns>
public static (string PrivateKey,string PublicKey) GenerateKeyPair()
{
//获取SM2曲线参数
X9ECParameters curve = ECNamedCurveTable.GetByName("sm2p256v1");
KeyGenerationParameters parameters = new ECKeyGenerationParameters(new ECDomainParameters(curve), new SecureRandom());
//创建SM2密钥对生成器
ECKeyPairGenerator generator = new ECKeyPairGenerator();
generator.Init(parameters);
//创建密钥对
var keyPair = generator.GenerateKeyPair();
//私钥
var privateKey = Convert.ToBase64String(((ECPrivateKeyParameters)keyPair.Private).D.ToByteArrayUnsigned());
//公钥
var publicKey = Convert.ToBase64String(((ECPublicKeyParameters)keyPair.Public).Q.GetEncoded());
return (privateKey, publicKey);
}
3.使用SM2公钥加密
/// <summary>
/// SM2公钥加密
/// </summary>
/// <param name="strs"></param>
/// <param name="publicKey"></param>
/// <returns></returns>
public static string Encrypt(string strs, string publicKey)
{
//获取SM2曲线参数
X9ECParameters curve = ECNamedCurveTable.GetByName("sm2p256v1");
ECPoint q = curve.Curve.DecodePoint(Convert.FromBase64String(publicKey));
ECDomainParameters domainParameters = new ECDomainParameters(curve);
ECPublicKeyParameters publicKeyParameters = new ECPublicKeyParameters("EC", q, domainParameters);
//创建SM2加密器
SM2Engine engine = new SM2Engine();
engine.Init(true, new ParametersWithRandom(publicKeyParameters, new SecureRandom()));
//把待加密的字符串转换成字节数组
byte[] bytes = Encoding.UTF8.GetBytes(strs);
//执行加密
byte[] result = engine.ProcessBlock(bytes, 0, bytes.Length);
//将加密结果转换成Base64字符串，并返回
return Convert.ToBase64String(result);
}
4.SM2私钥解密
/// <summary>
/// SM2私钥解密
/// </summary>
/// <param name="strs"></param>
/// <param name="privateKey"></param>
/// <returns></returns>
public static string Decrypt(string strs, string privateKey)
{
//获取SM2曲线参数
X9ECParameters curve = ECNamedCurveTable.GetByName("sm2p256v1");
ECDomainParameters domainParameters = new ECDomainParameters(curve);
BigInteger bigInteger = new BigInteger(1, Convert.FromBase64String(privateKey));
ECPrivateKeyParameters privateKeyParameters = new ECPrivateKeyParameters(bigInteger, domainParameters);
//创建SM2解密器
SM2Engine engine = new SM2Engine();
engine.Init(false, privateKeyParameters);
//把待解密的Base64字符串转换成字节数组
byte[] bytes = Convert.FromBase64String(strs);
//执行解密
byte[] result = engine.ProcessBlock(bytes, 0, bytes. Length);
//将解密结果转换成字符串，并返回
return Encoding.UTF8.GetString(result);
}
总结：
SM2 密码复杂度高、处理速度快、机器性能消耗更小 被越来越多的程序员熟知和运用，您会在项目中使用SM2加解密吗？
