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    国密：生成SM2秘钥、加解密及加验签_sm2加密

    作者：代码艺术家 | 2024-01-31 08:46:00

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    sm2加密

    国密改造已经持续了很长时间了，相信很多从事金融科技类的程序猿都遇到过这个需求。这篇文章就为大家带来笔者对于国密改造的一些经验，主要是代码层面，有兴趣的同学可以研究下国密的算法模型！

    注：本文所用到的工具类并非笔者所写！

    目录

    一、国密简述

    二、依赖准备

    三、SM2算法应用

    1、生成SM2公私钥

    工具类

    测试Demo

     2、数据加解密

    一、国密简述

    国密——国家密码局制定的国家密码算法。主要包含SM1、SM2、SM3、SM4几种方式。

    SM1：对称加密，且算法不公开，使用硬件加密，本文不做叙述；

    SM2：非对称加密，签名以及生成秘钥速度优于RSA，基于ECC算法，运算效率更高，且更安全；

    SM3：摘要，国产杂凑算法，生成长度为256比特，优于MD5以及SHA-1算法；

    SM4： 无线局域网标准的分组数据算法。对称加密，密钥长度和分组长度均为128位；

    注意

    生成SM2 公钥是130 位 前面多了04两个标识符，注意区分！

    二、依赖准备

    国密主要用到下面的包

    1.         <dependency>
    2.             <groupId>org.bouncycastle</groupId>
    3.             <artifactId>bcpkix-jdk15on</artifactId>
    4.             <version>1.57</version>
    5.         </dependency>

    一定注意版本。实际项目中笔者发现项目其他子工程用到1.56版本的包，所以选择了低版本。

    三、SM2算法应用

    1、生成SM2公私钥

    工具类

    1. package cn.test.encrypt.utils.sm2;
    2.  
    3. import cn.test.encrypt.utils.Util;
    4. import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
    5. import org.bouncycastle.crypto.digests.SM3Digest;
    6. import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
    7. import org.bouncycastle.crypto.params.ECPublicKeyParameters;
    8. import org.bouncycastle.math.ec.ECPoint;
    9.  
    10. import java.math.BigInteger;
    11.  
    12. public class Cipher {
    13.     private int ct;
    14.     private ECPoint p2;
    15.     private SM3Digest sm3keybase;
    16.     private SM3Digest sm3c3;
    17.     private byte key[];
    18.     private byte keyOff;
    19.  
    20.     public Cipher()
    21.     {
    22.         this.ct = 1;
    23.         this.key = new byte[32];
    24.         this.keyOff = 0;
    25.     }
    26.  
    27.     private void Reset()
    28.     {
    29.         this.sm3keybase = new SM3Digest();
    30.         this.sm3c3 = new SM3Digest();
    31.  
    32.         byte p[] = Util.byteConvert32Bytes(p2.getX().toBigInteger());
    33.         this.sm3keybase.update(p, 0, p.length);
    34.         this.sm3c3.update(p, 0, p.length);
    35.  
    36.         p = Util.byteConvert32Bytes(p2.getY().toBigInteger());
    37.         this.sm3keybase.update(p, 0, p.length);
    38.         this.ct = 1;
    39.         NextKey();
    40.     }
    41.  
    42.     private void NextKey()
    43.     {
    44.         SM3Digest sm3keycur = new SM3Digest(this.sm3keybase);
    45.         sm3keycur.update((byte) (ct >> 24 & 0xff));
    46.         sm3keycur.update((byte) (ct >> 16 & 0xff));
    47.         sm3keycur.update((byte) (ct >> 8 & 0xff));
    48.         sm3keycur.update((byte) (ct & 0xff));
    49.         sm3keycur.doFinal(key, 0);
    50.         this.keyOff = 0;
    51.         this.ct++;
    52.     }
    53.  
    54.     public ECPoint Init_enc(SM2 sm2, ECPoint userKey)
    55.     {
    56.         AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();
    57.         ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
    58.         ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
    59.         BigInteger k = ecpriv.getD();
    60.         ECPoint c1 = ecpub.getQ();
    61.         this.p2 = userKey.multiply(k);
    62.         Reset();
    63.         return c1;
    64.     }
    65.  
    66.     public void Encrypt(byte data[])
    67.     {
    68.         this.sm3c3.update(data, 0, data.length);
    69.         for (int i = 0; i < data.length; i++)
    70.         {
    71.             if (keyOff == key.length)
    72.             {
    73.                 NextKey();
    74.             }
    75.             data[i] ^= key[keyOff++];
    76.         }
    77.     }
    78.  
    79.     public void Init_dec(BigInteger userD, ECPoint c1)
    80.     {
    81.         this.p2 = c1.multiply(userD);
    82.         Reset();
    83.     }
    84.  
    85.     public void Decrypt(byte data[])
    86.     {
    87.         for (int i = 0; i < data.length; i++)
    88.         {
    89.             if (keyOff == key.length)
    90.             {
    91.                 NextKey();
    92.             }
    93.             data[i] ^= key[keyOff++];
    94.         }
    95.  
    96.         this.sm3c3.update(data, 0, data.length);
    97.     }
    98.  
    99.     public void Dofinal(byte c3[])
    100.     {
    101.         byte p[] = Util.byteConvert32Bytes(p2.getY().toBigInteger());
    102.         this.sm3c3.update(p, 0, p.length);
    103.         this.sm3c3.doFinal(c3, 0);
    104.         Reset();
    105.     }
    106. }
    1. package cn.test.encrypt.utils.sm2;
    2.  
    3.  
    4. import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
    5. import org.bouncycastle.crypto.params.ECDomainParameters;
    6. import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
    7. import org.bouncycastle.math.ec.ECCurve;
    8. import org.bouncycastle.math.ec.ECFieldElement;
    9. import org.bouncycastle.math.ec.ECFieldElement.Fp;
    10. import org.bouncycastle.math.ec.ECPoint;
    11.  
    12. import java.math.BigInteger;
    13. import java.security.SecureRandom;
    14.  
    15. public class SM2 {
    16.  
    17.     //国密参数
    18.     public static String[] ecc_param = {
    19.             "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",
    20.             "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",
    21.             "28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",
    22.             "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",
    23.             "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",
    24.             "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
    25.     };
    26.  
    27.     public static SM2 Instance()
    28.     {
    29.         return new SM2();
    30.     }
    31.  
    32.     public final BigInteger ecc_p;
    33.     public final BigInteger ecc_a;
    34.     public final BigInteger ecc_b;
    35.     public final BigInteger ecc_n;
    36.     public final BigInteger ecc_gx;
    37.     public final BigInteger ecc_gy;
    38.     public final ECCurve ecc_curve;
    39.     public final ECPoint ecc_point_g;
    40.     public final ECDomainParameters ecc_bc_spec;
    41.     public final ECKeyPairGenerator ecc_key_pair_generator;
    42.     public final ECFieldElement ecc_gx_fieldelement;
    43.     public final ECFieldElement ecc_gy_fieldelement;
    44.  
    45.     public SM2()
    46.     {
    47.         this.ecc_p = new BigInteger(ecc_param[0], 16);
    48.         this.ecc_a = new BigInteger(ecc_param[1], 16);
    49.         this.ecc_b = new BigInteger(ecc_param[2], 16);
    50.         this.ecc_n = new BigInteger(ecc_param[3], 16);
    51.         this.ecc_gx = new BigInteger(ecc_param[4], 16);
    52.         this.ecc_gy = new BigInteger(ecc_param[5], 16);
    53.  
    54.         this.ecc_gx_fieldelement = new Fp(this.ecc_p, this.ecc_gx);
    55.         this.ecc_gy_fieldelement = new Fp(this.ecc_p, this.ecc_gy);
    56.  
    57.         this.ecc_curve = new ECCurve.Fp(this.ecc_p, this.ecc_a, this.ecc_b);
    58.         this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement, this.ecc_gy_fieldelement);
    59.  
    60.         this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n);
    61.  
    62.         ECKeyGenerationParameters ecc_ecgenparam;
    63.         ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());
    64.  
    65.         this.ecc_key_pair_generator = new ECKeyPairGenerator();
    66.         this.ecc_key_pair_generator.init(ecc_ecgenparam);
    67.     }
    68. }

    生成随机秘钥工具类

    1. package cn.test.encrypt.utils.sm2;
    2.  
    3.  
    4. import cn.test.encrypt.utils.Util;
    5. import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
    6. import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
    7. import org.bouncycastle.crypto.params.ECPublicKeyParameters;
    8. import org.bouncycastle.math.ec.ECPoint;
    9.  
    10. import java.io.IOException;
    11. import java.math.BigInteger;
    12.  
    13. public class SM2EncDecUtils {
    14.     //生成随机秘钥对
    15.     public static SM2KeyVO generateKeyPair(){
    16.         SM2 sm2 = SM2.Instance();
    17.         AsymmetricCipherKeyPair key = null;
    18.         while (true){
    19.             key=sm2.ecc_key_pair_generator.generateKeyPair();
    20.             if(((ECPrivateKeyParameters) key.getPrivate()).getD().toByteArray().length==32){
    21.                 break;
    22.             }
    23.         }
    24.         ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
    25.         ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
    26.         BigInteger privateKey = ecpriv.getD();
    27.         ECPoint publicKey = ecpub.getQ();
    28.         SM2KeyVO sm2KeyVO = new SM2KeyVO();
    29.         sm2KeyVO.setPublicKey(publicKey);
    30.         sm2KeyVO.setPrivateKey(privateKey);
    31.         //System.out.println("公钥: " + Util.byteToHex(publicKey.getEncoded()));
    32.         //System.out.println("私钥: " + Util.byteToHex(privateKey.toByteArray()));
    33.         return sm2KeyVO;
    34.     }
    35.  
    36.     //数据加密
    37.     public static String encrypt(byte[] publicKey, byte[] data) throws IOException
    38.     {
    39.         if (publicKey == null || publicKey.length == 0)
    40.         {
    41.             return null;
    42.         }
    43.  
    44.         if (data == null || data.length == 0)
    45.         {
    46.             return null;
    47.         }
    48.  
    49.         byte[] source = new byte[data.length];
    50.         //将数组data复制到source
    51.         System.arraycopy(data, 0, source, 0, data.length);
    52.  
    53.         Cipher cipher = new Cipher();
    54.         SM2 sm2 = SM2.Instance();//new自建类,， SM2 sm2 = new SM2();
    55.         ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);
    56.  
    57.         ECPoint c1 = cipher.Init_enc(sm2, userKey);
    58.         cipher.Encrypt(source);
    59.         byte[] c3 = new byte[32];
    60.         cipher.Dofinal(c3);
    61.  
    62.      // System.out.println("C1 " + Util.byteToHex(c1.getEncoded()));
    63.      // System.out.println("C2 " + Util.byteToHex(source));
    64.      //System.out.println("C3 " + Util.byteToHex(c3));
    65.         //C1 C2 C3拼装成加密字串
    66.         // C1 | C2 | C3
    67.         //return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(source) + Util.byteToHex(c3);
    68.         // C1 | C3 | C2
    69.         return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(c3) + Util.byteToHex(source);
    70.     }
    71.  
    72.     //数据解密
    73.     public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException
    74.     {
    75.         if (privateKey == null || privateKey.length == 0)
    76.         {
    77.             return null;
    78.         }
    79.  
    80.         if (encryptedData == null || encryptedData.length == 0)
    81.         {
    82.             return null;
    83.         }
    84.         //加密字节数组转换为十六进制的字符串 长度变为encryptedData.length * 2
    85.         String data = Util.byteToHex(encryptedData);
    86.         /***分解加密字串 C1 | C2 | C3
    87.          * （C1 = C1标志位2位 + C1实体部分128位 = 130）
    88.          * （C3 = C3实体部分64位  = 64）
    89.          * （C2 = encryptedData.length * 2 - C1长度  - C2长度）
    91.         byte[] c1Bytes = Util.hexToByte(data.substring(0,130));
    92.         int c2Len = encryptedData.length - 97;
    93.         byte[] c2 = Util.hexToByte(data.substring(130,130 + 2 * c2Len));
    94.         byte[] c3 = Util.hexToByte(data.substring(130 + 2 * c2Len,194 + 2 * c2Len));
    95.         */
    96.         /***分解加密字串 C1 | C3 | C2
    97.          * （C1 = C1标志位2位 + C1实体部分128位 = 130）
    98.          * （C3 = C3实体部分64位  = 64）
    99.          * （C2 = encryptedData.length * 2 - C1长度  - C2长度）
    100.          */
    101.         byte[] c1Bytes = Util.hexToByte(data.substring(0,130));
    102.         int c2Len = encryptedData.length - 97;
    103.         byte[] c3 = Util.hexToByte(data.substring(130,130 + 64));
    104.         byte[] c2 = Util.hexToByte(data.substring(194,194 + 2 * c2Len));
    105.  
    106.         SM2 sm2 = SM2.Instance();
    107.         BigInteger userD = new BigInteger(1, privateKey);
    108.  
    109.         //通过C1实体字节来生成ECPoint
    110.         ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);
    111.         Cipher cipher = new Cipher();
    112.         cipher.Init_dec(userD, c1);
    113.         cipher.Decrypt(c2);
    114.         cipher.Dofinal(c3);
    115.  
    116.         //返回解密结果
    117.         return c2;
    118.     }
    119.  
    120. }

    SM2曲线算法工具类

    1. package cn.test.encrypt.utils.sm2;
    2.  
    3. import cn.test.encrypt.utils.Util;
    4. import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
    5. import org.bouncycastle.crypto.digests.SM3Digest;
    6. import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
    7. import org.bouncycastle.crypto.params.ECDomainParameters;
    8. import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
    9. import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
    10. import org.bouncycastle.crypto.params.ECPublicKeyParameters;
    11. import org.bouncycastle.math.ec.ECCurve;
    12. import org.bouncycastle.math.ec.ECFieldElement;
    13. import org.bouncycastle.math.ec.ECFieldElement.Fp;
    14. import org.bouncycastle.math.ec.ECPoint;
    15.  
    16. import java.math.BigInteger;
    17. import java.security.SecureRandom;
    18.  
    19.  
    20. public class SM2Factory {
    21. 	/*-----------------------国密算法相关参数begin-----------
    22. 	 * ------------------*/
    23. 	//A 第一系数
    24. 	private static final BigInteger a  = new BigInteger("fffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc",16);
    25. 	//B 第二系数
    26. 	private static final BigInteger b  = new BigInteger("28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93",16);
    27. 	//曲线X系数
    28. 	private static final BigInteger gx = new BigInteger("32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7",16);
    29. 	//曲线Y系数
    30. 	private static final BigInteger gy = new BigInteger("bc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0",16);
    31. 	//生产者顺序系数
    32. 	private static final BigInteger n  = new BigInteger("fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123",16);
    33. 	//素数
    34. 	private static final BigInteger p  = new BigInteger("fffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff",16);
    35. 	//因子系数 1
    36. 	private static final int h  = 1;
    37. 	/*-----------------------国密算法相关参数end-----------------------------*/
    38. 	//一些必要类
    39. 	public final ECFieldElement ecc_gx_fieldelement;
    40. 	public final ECFieldElement ecc_gy_fieldelement;
    41. 	public final ECCurve ecc_curve;
    42. 	public final ECPoint ecc_point_g;
    43. 	public final ECDomainParameters ecc_bc_spec;
    44. 	public final ECKeyPairGenerator ecc_key_pair_generator;
    45. 	/**
    46. 	 * 初始化方法
    47. 	 * @return
    48. 	 */
    49. 	public static SM2Factory getInstance(){
    50. 		return new SM2Factory();
    51. 	}
    52. 	public SM2Factory() {
    53.  
    54. 		this.ecc_gx_fieldelement = new Fp(this.p,this.gx);
    55. 		this.ecc_gy_fieldelement = new Fp(this.p, this.gy);
    56.  
    57. 		this.ecc_curve = new ECCurve.Fp(this.p, this.a, this.b);
    58.  
    59. 		this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement,this.ecc_gy_fieldelement);
    60. 		this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.n);
    61.  
    62. 		ECKeyGenerationParameters ecc_ecgenparam;
    63. 		ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());
    64.  
    65. 		this.ecc_key_pair_generator = new ECKeyPairGenerator();
    66. 		this.ecc_key_pair_generator.init(ecc_ecgenparam);
    67. 	}
    68. 	/**
    69. 	 * 根据私钥、曲线参数计算Z
    70. 	 * @param userId
    71. 	 * @param userKey
    72. 	 * @return
    73. 	 */
    74. 	public  byte[] sm2GetZ(byte[] userId, ECPoint userKey){
    75. 		SM3Digest sm3 = new SM3Digest();
    76.  
    77. 		int len = userId.length * 8;
    78. 		sm3.update((byte) (len >> 8 & 0xFF));
    79. 		sm3.update((byte) (len & 0xFF));
    80. 		sm3.update(userId, 0, userId.length);
    81.  
    82. 		byte[] p = Util.byteConvert32Bytes(this.a);
    83. 		sm3.update(p, 0, p.length);
    84.  
    85. 		p = Util.byteConvert32Bytes(this.b);
    86. 		sm3.update(p, 0, p.length);
    87.  
    88. 		p = Util.byteConvert32Bytes(this.gx);
    89. 		sm3.update(p, 0, p.length);
    90.  
    91. 		p = Util.byteConvert32Bytes(this.gy);
    92. 		sm3.update(p, 0, p.length);
    93.  
    94. 		p = Util.byteConvert32Bytes(userKey.normalize().getXCoord().toBigInteger());
    95. 		sm3.update(p, 0, p.length);
    96.  
    97. 		p = Util.byteConvert32Bytes(userKey.normalize().getYCoord().toBigInteger());
    98. 		sm3.update(p, 0, p.length);
    99.  
    100. 		byte[] md = new byte[sm3.getDigestSize()];
    101. 		sm3.doFinal(md, 0);
    102. 		return md;
    103. 	}
    104. 	/**
    105. 	 * 签名相关值计算
    106. 	 * @param md
    107. 	 * @param userD
    108. 	 * @param userKey
    109. 	 * @param sm2Result
    110. 	 */
    111. 	public void sm2Sign(byte[] md, BigInteger userD, ECPoint userKey, SM2Result sm2Result) {
    112. 		BigInteger e = new BigInteger(1, md);
    113. 		BigInteger k = null;
    114. 		ECPoint kp = null;
    115. 		BigInteger r = null;
    116. 		BigInteger s = null;
    117. 		do {
    118. 			do {
    119. 				// 正式环境
    120. 				AsymmetricCipherKeyPair keypair = ecc_key_pair_generator.generateKeyPair();
    121. 				ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) keypair.getPrivate();
    122. 				ECPublicKeyParameters ecpub = (ECPublicKeyParameters) keypair.getPublic();
    123. 				k = ecpriv.getD();
    124. 				kp = ecpub.getQ();
    125. 				//System.out.println("BigInteger:" + k + "\nECPoint:" + kp);
    126.  
    127. 				//System.out.println("计算曲线点X1: "+ kp.getXCoord().toBigInteger().toString(16));
    128. 				//System.out.println("计算曲线点Y1: "+ kp.getYCoord().toBigInteger().toString(16));
    129. 				//System.out.println("");
    130. 				// r
    131. 				r = e.add(kp.getXCoord().toBigInteger());
    132. 				r = r.mod(this.n);
    133. 			} while (r.equals(BigInteger.ZERO) || r.add(k).equals(this.n)||r.toString(16).length()!=64);
    134.  
    135. 			// (1 + dA)~-1
    136. 			BigInteger da_1 = userD.add(BigInteger.ONE);
    137. 			da_1 = da_1.modInverse(this.n);
    138. 			// s
    139. 			s = r.multiply(userD);
    140. 			s = k.subtract(s).mod(this.n);
    141. 			s = da_1.multiply(s).mod(this.n);
    142. 		} while (s.equals(BigInteger.ZERO)||(s.toString(16).length()!=64));
    143.  
    144. 		sm2Result.r = r;
    145. 		sm2Result.s = s;
    146. 	}
    147. 	/**
    148. 	 * 验签
    149. 	 * @param md sm3摘要
    150. 	 * @param userKey 根据公钥decode一个ecpoint对象
    151. 	 * @param r 没有特殊含义
    152. 	 * @param s 没有特殊含义
    153. 	 * @param sm2Result 接收参数的对象
    154. 	 */
    155. 	public void sm2Verify(byte md[], ECPoint userKey, BigInteger r,
    156.                           BigInteger s, SM2Result sm2Result) {
    157. 		sm2Result.R = null;
    158. 		BigInteger e = new BigInteger(1, md);
    159. 		BigInteger t = r.add(s).mod(this.n);
    160. 		if (t.equals(BigInteger.ZERO)) {
    161. 			return;
    162. 		} else {
    163. 			ECPoint x1y1 = ecc_point_g.multiply(sm2Result.s);
    164. 			//System.out.println("计算曲线点X0: "+ x1y1.normalize().getXCoord().toBigInteger().toString(16));
    165. 			//System.out.println("计算曲线点Y0: "+ x1y1.normalize().getYCoord().toBigInteger().toString(16));
    166. 			//System.out.println("");
    167.  
    168. 			x1y1 = x1y1.add(userKey.multiply(t));
    169. 			//System.out.println("计算曲线点X1: "+ x1y1.normalize().getXCoord().toBigInteger().toString(16));
    170. 			//System.out.println("计算曲线点Y1: "+ x1y1.normalize().getYCoord().toBigInteger().toString(16));
    171. 			//System.out.println("");
    172. 			sm2Result.R = e.add(x1y1.normalize().getXCoord().toBigInteger()).mod(this.n);
    173. 			//System.out.println("R: " + sm2Result.R.toString(16));
    174. 			return;
    175. 		}
    176. 	}
    177.  
    178. }

    工具类

    1. package cn.test.encrypt.utils;
    2.  
    3. import java.math.BigInteger;
    4.  
    5. public class Util {
    6.     /**
    7.      * 整形转换成网络传输的字节流（字节数组）型数据
    8.      *
    9.      * @param num 一个整型数据
    10.      * @return 4个字节的自己数组
    11.      */
    12.     public static byte[] intToBytes(int num) {
    13.         byte[] bytes = new byte[4];
    14.         bytes[0] = (byte) (0xff & (num >> 0));
    15.         bytes[1] = (byte) (0xff & (num >> 8));
    16.         bytes[2] = (byte) (0xff & (num >> 16));
    17.         bytes[3] = (byte) (0xff & (num >> 24));
    18.         return bytes;
    19.     }
    20.  
    21.     /**
    22.      * 四个字节的字节数据转换成一个整形数据
    23.      *
    24.      * @param bytes 4个字节的字节数组
    25.      * @return 一个整型数据
    26.      */
    27.     public static int byteToInt(byte[] bytes) {
    28.         int num = 0;
    29.         int temp;
    30.         temp = (0x000000ff & (bytes[0])) << 0;
    31.         num = num | temp;
    32.         temp = (0x000000ff & (bytes[1])) << 8;
    33.         num = num | temp;
    34.         temp = (0x000000ff & (bytes[2])) << 16;
    35.         num = num | temp;
    36.         temp = (0x000000ff & (bytes[3])) << 24;
    37.         num = num | temp;
    38.         return num;
    39.     }
    40.  
    41.     /**
    42.      * 长整形转换成网络传输的字节流（字节数组）型数据
    43.      *
    44.      * @param num 一个长整型数据
    45.      * @return 4个字节的自己数组
    46.      */
    47.     public static byte[] longToBytes(long num) {
    48.         byte[] bytes = new byte[8];
    49.         for (int i = 0; i < 8; i++) {
    50.             bytes[i] = (byte) (0xff & (num >> (i * 8)));
    51.         }
    52.  
    53.         return bytes;
    54.     }
    55.  
    56.     /**
    57.      * 大数字转换字节流（字节数组）型数据
    58.      *
    59.      * @param n
    60.      * @return
    61.      */
    62.     public static byte[] byteConvert32Bytes(BigInteger n) {
    63.         byte tmpd[] = (byte[]) null;
    64.         if (n == null) {
    65.             return null;
    66.         }
    67.  
    68.         if (n.toByteArray().length == 33) {
    69.             tmpd = new byte[32];
    70.             System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
    71.         } else if (n.toByteArray().length == 32) {
    72.             tmpd = n.toByteArray();
    73.         } else {
    74.             tmpd = new byte[32];
    75.             for (int i = 0; i < 32 - n.toByteArray().length; i++) {
    76.                 tmpd[i] = 0;
    77.             }
    78.             System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);
    79.         }
    80.         return tmpd;
    81.     }
    82.  
    83.     /**
    84.      * 换字节流（字节数组）型数据转大数字
    85.      *
    86.      * @param b
    87.      * @return
    88.      */
    89.     public static BigInteger byteConvertInteger(byte[] b) {
    90.         if (b[0] < 0) {
    91.             byte[] temp = new byte[b.length + 1];
    92.             temp[0] = 0;
    93.             System.arraycopy(b, 0, temp, 1, b.length);
    94.             return new BigInteger(temp);
    95.         }
    96.         return new BigInteger(b);
    97.     }
    98.  
    99.     /**
    100.      * 根据字节数组获得值(十六进制数字)
    101.      *
    102.      * @param bytes
    103.      * @return
    104.      */
    105.     public static String getHexString(byte[] bytes) {
    106.         return getHexString(bytes, true);
    107.     }
    108.  
    109.     /**
    110.      * 根据字节数组获得值(十六进制数字)
    111.      *
    112.      * @param bytes
    113.      * @param upperCase
    114.      * @return
    115.      */
    116.     public static String getHexString(byte[] bytes, boolean upperCase) {
    117.         String ret = "";
    118.         for (int i = 0; i < bytes.length; i++) {
    119.             ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);
    120.         }
    121.         return upperCase ? ret.toUpperCase() : ret;
    122.     }
    123.  
    124.     /**
    125.      * 打印十六进制字符串
    126.      *
    127.      * @param bytes
    128.      */
    129.     public static void printHexString(byte[] bytes) {
    130.         for (int i = 0; i < bytes.length; i++) {
    131.             String hex = Integer.toHexString(bytes[i] & 0xFF);
    132.             if (hex.length() == 1) {
    133.                 hex = '0' + hex;
    134.             }
    135.             System.out.print("0x" + hex.toUpperCase() + ",");
    136.         }
    137.         System.out.println("");
    138.     }
    139.  
    140.     /**
    141.      * Convert hex string to byte[]
    142.      *
    143.      * @param hexString the hex string
    144.      * @return byte[]
    145.      */
    146.     public static byte[] hexStringToBytes(String hexString) {
    147.         if (hexString == null || hexString.equals("")) {
    148.             return null;
    149.         }
    150.  
    151.         hexString = hexString.toUpperCase();
    152.         int length = hexString.length() / 2;
    153.         char[] hexChars = hexString.toCharArray();
    154.         byte[] d = new byte[length];
    155.         for (int i = 0; i < length; i++) {
    156.             int pos = i * 2;
    157.             d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
    158.         }
    159.         return d;
    160.     }
    161.  
    162.     /**
    163.      * Convert char to byte
    164.      *
    165.      * @param c char
    166.      * @return byte
    167.      */
    168.     public static byte charToByte(char c) {
    169.         return (byte) "0123456789ABCDEF".indexOf(c);
    170.     }
    171.  
    172.     /**
    173.      * 用于建立十六进制字符的输出的小写字符数组
    174.      */
    175.     private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
    176.             '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    177.  
    178.     /**
    179.      * 用于建立十六进制字符的输出的大写字符数组
    180.      */
    181.     private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
    182.             '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
    183.  
    184.     /**
    185.      * 将字节数组转换为十六进制字符数组
    186.      *
    187.      * @param data byte[]
    188.      * @return 十六进制char[]
    189.      */
    190.     public static char[] encodeHex(byte[] data) {
    191.         return encodeHex(data, true);
    192.     }
    193.  
    194.     /**
    195.      * 将字节数组转换为十六进制字符数组
    196.      *
    197.      * @param data        byte[]
    198.      * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
    199.      * @return 十六进制char[]
    200.      */
    201.     public static char[] encodeHex(byte[] data, boolean toLowerCase) {
    202.         return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
    203.     }
    204.  
    205.     /**
    206.      * 将字节数组转换为十六进制字符数组
    207.      *
    208.      * @param data     byte[]
    209.      * @param toDigits 用于控制输出的char[]
    210.      * @return 十六进制char[]
    211.      */
    212.     protected static char[] encodeHex(byte[] data, char[] toDigits) {
    213.         int l = data.length;
    214.         char[] out = new char[l << 1];
    215.         // two characters form the hex value.
    216.         for (int i = 0, j = 0; i < l; i++) {
    217.             out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
    218.             out[j++] = toDigits[0x0F & data[i]];
    219.         }
    220.         return out;
    221.     }
    222.  
    223.     /**
    224.      * 将字节数组转换为十六进制字符串
    225.      *
    226.      * @param data byte[]
    227.      * @return 十六进制String
    228.      */
    229.     public static String encodeHexString(byte[] data) {
    230.         return encodeHexString(data, true);
    231.     }
    232.  
    233.     /**
    234.      * 将字节数组转换为十六进制字符串
    235.      *
    236.      * @param data        byte[]
    237.      * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
    238.      * @return 十六进制String
    239.      */
    240.     public static String encodeHexString(byte[] data, boolean toLowerCase) {
    241.         return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
    242.     }
    243.  
    244.     /**
    245.      * 将字节数组转换为十六进制字符串
    246.      *
    247.      * @param data     byte[]
    248.      * @param toDigits 用于控制输出的char[]
    249.      * @return 十六进制String
    250.      */
    251.     protected static String encodeHexString(byte[] data, char[] toDigits) {
    252.         return new String(encodeHex(data, toDigits));
    253.     }
    254.  
    255.     /**
    256.      * 将十六进制字符数组转换为字节数组
    257.      *
    258.      * @param data 十六进制char[]
    259.      * @return byte[]
    260.      * @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
    261.      */
    262.     public static byte[] decodeHex(char[] data) {
    263.         int len = data.length;
    264.  
    265.         if ((len & 0x01) != 0) {
    266.             throw new RuntimeException("Odd number of characters.");
    267.         }
    268.  
    269.         byte[] out = new byte[len >> 1];
    270.  
    271.         // two characters form the hex value.
    272.         for (int i = 0, j = 0; j < len; i++) {
    273.             int f = toDigit(data[j], j) << 4;
    274.             j++;
    275.             f = f | toDigit(data[j], j);
    276.             j++;
    277.             out[i] = (byte) (f & 0xFF);
    278.         }
    279.  
    280.         return out;
    281.     }
    282.  
    283.     /**
    284.      * 将十六进制字符转换成一个整数
    285.      *
    286.      * @param ch    十六进制char
    287.      * @param index 十六进制字符在字符数组中的位置
    288.      * @return 一个整数
    289.      * @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常
    290.      */
    291.     protected static int toDigit(char ch, int index) {
    292.         int digit = Character.digit(ch, 16);
    293.         if (digit == -1) {
    294.             throw new RuntimeException("Illegal hexadecimal character " + ch
    295.                     + " at index " + index);
    296.         }
    297.         return digit;
    298.     }
    299.  
    300.     /**
    301.      * 数字字符串转ASCII码字符串
    302.      *
    303.      * @param String 字符串
    304.      * @return ASCII字符串
    305.      */
    306.     public static String StringToAsciiString(String content) {
    307.         String result = "";
    308.         int max = content.length();
    309.         for (int i = 0; i < max; i++) {
    310.             char c = content.charAt(i);
    311.             String b = Integer.toHexString(c);
    312.             result = result + b;
    313.         }
    314.         return result;
    315.     }
    316.  
    317.     /**
    318.      * 十六进制转字符串
    319.      *
    320.      * @param hexString  十六进制字符串
    321.      * @param encodeType 编码类型4：Unicode，2：普通编码
    322.      * @return 字符串
    323.      */
    324.     public static String hexStringToString(String hexString, int encodeType) {
    325.         String result = "";
    326.         int max = hexString.length() / encodeType;
    327.         for (int i = 0; i < max; i++) {
    328.             char c = (char) hexStringToAlgorism(hexString
    329.                     .substring(i * encodeType, (i + 1) * encodeType));
    330.             result += c;
    331.         }
    332.         return result;
    333.     }
    334.  
    335.     /**
    336.      * 十六进制字符串装十进制
    337.      *
    338.      * @param hex 十六进制字符串
    339.      * @return 十进制数值
    340.      */
    341.     public static int hexStringToAlgorism(String hex) {
    342.         hex = hex.toUpperCase();
    343.         int max = hex.length();
    344.         int result = 0;
    345.         for (int i = max; i > 0; i--) {
    346.             char c = hex.charAt(i - 1);
    347.             int algorism = 0;
    348.             if (c >= '0' && c <= '9') {
    349.                 algorism = c - '0';
    350.             } else {
    351.                 algorism = c - 55;
    352.             }
    353.             result += Math.pow(16, max - i) * algorism;
    354.         }
    355.         return result;
    356.     }
    357.  
    358.     /**
    359.      * 十六转二进制
    360.      *
    361.      * @param hex 十六进制字符串
    362.      * @return 二进制字符串
    363.      */
    364.     public static String hexStringToBinary(String hex) {
    365.         hex = hex.toUpperCase();
    366.         String result = "";
    367.         int max = hex.length();
    368.         for (int i = 0; i < max; i++) {
    369.             char c = hex.charAt(i);
    370.             switch (c) {
    371.                 case '0':
    372.                     result += "0000";
    373.                     break;
    374.                 case '1':
    375.                     result += "0001";
    376.                     break;
    377.                 case '2':
    378.                     result += "0010";
    379.                     break;
    380.                 case '3':
    381.                     result += "0011";
    382.                     break;
    383.                 case '4':
    384.                     result += "0100";
    385.                     break;
    386.                 case '5':
    387.                     result += "0101";
    388.                     break;
    389.                 case '6':
    390.                     result += "0110";
    391.                     break;
    392.                 case '7':
    393.                     result += "0111";
    394.                     break;
    395.                 case '8':
    396.                     result += "1000";
    397.                     break;
    398.                 case '9':
    399.                     result += "1001";
    400.                     break;
    401.                 case 'A':
    402.                     result += "1010";
    403.                     break;
    404.                 case 'B':
    405.                     result += "1011";
    406.                     break;
    407.                 case 'C':
    408.                     result += "1100";
    409.                     break;
    410.                 case 'D':
    411.                     result += "1101";
    412.                     break;
    413.                 case 'E':
    414.                     result += "1110";
    415.                     break;
    416.                 case 'F':
    417.                     result += "1111";
    418.                     break;
    419.             }
    420.         }
    421.         return result;
    422.     }
    423.  
    424.     /**
    425.      * ASCII码字符串转数字字符串
    426.      *
    427.      * @param String ASCII字符串
    428.      * @return 字符串
    429.      */
    430.     public static String AsciiStringToString(String content) {
    431.         String result = "";
    432.         int length = content.length() / 2;
    433.         for (int i = 0; i < length; i++) {
    434.             String c = content.substring(i * 2, i * 2 + 2);
    435.             int a = hexStringToAlgorism(c);
    436.             char b = (char) a;
    437.             String d = String.valueOf(b);
    438.             result += d;
    439.         }
    440.         return result;
    441.     }
    442.  
    443.     /**
    444.      * 将十进制转换为指定长度的十六进制字符串
    445.      *
    446.      * @param algorism  int 十进制数字
    447.      * @param maxLength int 转换后的十六进制字符串长度
    448.      * @return String 转换后的十六进制字符串
    449.      */
    450.     public static String algorismToHexString(int algorism, int maxLength) {
    451.         String result = "";
    452.         result = Integer.toHexString(algorism);
    453.  
    454.         if (result.length() % 2 == 1) {
    455.             result = "0" + result;
    456.         }
    457.         return patchHexString(result.toUpperCase(), maxLength);
    458.     }
    459.  
    460.     /**
    461.      * 字节数组转为普通字符串（ASCII对应的字符）
    462.      *
    463.      * @param bytearray byte[]
    464.      * @return String
    465.      */
    466.     public static String byteToString(byte[] bytearray) {
    467.         String result = "";
    468.         char temp;
    469.  
    470.         int length = bytearray.length;
    471.         for (int i = 0; i < length; i++) {
    472.             temp = (char) bytearray[i];
    473.             result += temp;
    474.         }
    475.         return result;
    476.     }
    477.  
    478.     /**
    479.      * 二进制字符串转十进制
    480.      *
    481.      * @param binary 二进制字符串
    482.      * @return 十进制数值
    483.      */
    484.     public static int binaryToAlgorism(String binary) {
    485.         int max = binary.length();
    486.         int result = 0;
    487.         for (int i = max; i > 0; i--) {
    488.             char c = binary.charAt(i - 1);
    489.             int algorism = c - '0';
    490.             result += Math.pow(2, max - i) * algorism;
    491.         }
    492.         return result;
    493.     }
    494.  
    495.     /**
    496.      * 十进制转换为十六进制字符串
    497.      *
    498.      * @param algorism int 十进制的数字
    499.      * @return String 对应的十六进制字符串
    500.      */
    501.     public static String algorismToHEXString(int algorism) {
    502.         String result = "";
    503.         result = Integer.toHexString(algorism);
    504.  
    505.         if (result.length() % 2 == 1) {
    506.             result = "0" + result;
    507.  
    508.         }
    509.         result = result.toUpperCase();
    510.  
    511.         return result;
    512.     }
    513.  
    514.     /**
    515.      * HEX字符串前补0，主要用于长度位数不足。
    516.      *
    517.      * @param str       String 需要补充长度的十六进制字符串
    518.      * @param maxLength int 补充后十六进制字符串的长度
    519.      * @return 补充结果
    520.      */
    521.     static public String patchHexString(String str, int maxLength) {
    522.         String temp = "";
    523.         for (int i = 0; i < maxLength - str.length(); i++) {
    524.             temp = "0" + temp;
    525.         }
    526.         str = (temp + str).substring(0, maxLength);
    527.         return str;
    528.     }
    529.  
    530.     /**
    531.      * 将一个字符串转换为int
    532.      *
    533.      * @param s          String 要转换的字符串
    534.      * @param defaultInt int 如果出现异常,默认返回的数字
    535.      * @param radix      int 要转换的字符串是什么进制的,如16 8 10.
    536.      * @return int 转换后的数字
    537.      */
    538.     public static int parseToInt(String s, int defaultInt, int radix) {
    539.         int i = 0;
    540.         try {
    541.             i = Integer.parseInt(s, radix);
    542.         } catch (NumberFormatException ex) {
    543.             i = defaultInt;
    544.         }
    545.         return i;
    546.     }
    547.  
    548.     /**
    549.      * 将一个十进制形式的数字字符串转换为int
    550.      *
    551.      * @param s          String 要转换的字符串
    552.      * @param defaultInt int 如果出现异常,默认返回的数字
    553.      * @return int 转换后的数字
    554.      */
    555.     public static int parseToInt(String s, int defaultInt) {
    556.         int i = 0;
    557.         try {
    558.             i = Integer.parseInt(s);
    559.         } catch (NumberFormatException ex) {
    560.             i = defaultInt;
    561.         }
    562.         return i;
    563.     }
    564.  
    565.     /**
    566.      * 十六进制串转化为byte数组
    567.      *
    568.      * @return the array of byte
    569.      */
    570.     public static byte[] hexToByte(String hex)
    571.             throws IllegalArgumentException {
    572.         if (hex.length() % 2 != 0) {
    573.             throw new IllegalArgumentException();
    574.         }
    575.         char[] arr = hex.toCharArray();
    576.         byte[] b = new byte[hex.length() / 2];
    577.         for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
    578.             String swap = "" + arr[i++] + arr[i];
    579.             int byteint = Integer.parseInt(swap, 16) & 0xFF;
    580.             b[j] = new Integer(byteint).byteValue();
    581.         }
    582.         return b;
    583.     }
    584.  
    585.     /**
    586.      * 字节数组转换为十六进制字符串
    587.      *
    588.      * @param b byte[] 需要转换的字节数组
    589.      * @return String 十六进制字符串
    590.      */
    591.     public static String byteToHex(byte b[]) {
    592.         if (b == null) {
    593.             throw new IllegalArgumentException(
    594.                     "Argument b ( byte array ) is null! ");
    595.         }
    596.         String hs = "";
    597.         String stmp = "";
    598.         for (int n = 0; n < b.length; n++) {
    599.             stmp = Integer.toHexString(b[n] & 0xff);
    600.             if (stmp.length() == 1) {
    601.                 hs = hs + "0" + stmp;
    602.             } else {
    603.                 hs = hs + stmp;
    604.             }
    605.         }
    606.         return hs.toLowerCase();
    607.         //return hs.toUpperCase();
    608.     }
    609.  
    610.     public static byte[] subByte(byte[] input, int startIndex, int length) {
    611.         byte[] bt = new byte[length];
    612.         for (int i = 0; i < length; i++) {
    613.             bt[i] = input[i + startIndex];
    614.         }
    615.         return bt;
    616.     }
    617. }

    SM2对象

    1. package cn.test.encrypt.utils.sm2;
    2.  
    3. import cn.test.encrypt.utils.Util;
    4. import cn.test.encrypt.test.SecurityTestAll;
    5. import org.bouncycastle.math.ec.ECPoint;
    6.  
    7. import java.math.BigInteger;
    8.  
    9. public class SM2KeyVO {
    10.     BigInteger privateKey ;
    11.     ECPoint publicKey ;
    12.  
    13.     public BigInteger getPrivateKey() {
    14.         return privateKey;
    15.     }
    16.  
    17.     public void setPrivateKey(BigInteger privateKey) {
    18.         this.privateKey = privateKey;
    19.     }
    20.  
    21.     public ECPoint getPublicKey() {
    22.         return publicKey;
    23.     }
    24.  
    25.     public void setPublicKey(ECPoint publicKey) {
    26.         this.publicKey = publicKey;
    27.     }
    28.  
    29.     //HardPubKey:3059301306072A8648CE3D020106082A811CCF5501822D03420004+X+Y
    30.     //SoftPubKey:04+X+Y
    31.     public String getPubHexInSoft(){
    32.         return Util.byteToHex(publicKey.getEncoded(true));
    33.         //System.out.println("公钥: " + );
    34.     }
    35.     public String getPubHexInHard(){
    36.         return SecurityTestAll.SM2PubHardKeyHead +Util.byteToHex(publicKey.getEncoded(true));
    37.     }
    38.     public String getPriHexInSoft(){
    39.         return Util.byteToHex(privateKey.toByteArray());
    40.     }
    41. }

    测试Demo

    1.  public static void main(String[] args) {
    2.         SM2KeyVO initKeyVO = SM2EncDecUtils.generateKeyPair();
    3.         System.out.println("初始公钥为: "+initKeyVO.getPubHexInSoft());
    4.         System.out.println("初始私钥为: "+initKeyVO.getPriHexInSoft());
    5.     }

    输出结果：

     2、数据加解密

    简单业务描述：使用初始公钥加密工作公钥，使用初始私钥解密加密后公钥；

    Demo

    1.     public static void main(String[] args) throws IOException {
    2.         //生成初始秘钥
    3.         SM2KeyVO initKeyVO = SM2EncDecUtils.generateKeyPair();
    4.         String initPubKey = initKeyVO.getPubHexInSoft();
    5.         String initPriKey = initKeyVO.getPriHexInSoft();
    6.         System.out.println("初始公钥为: " + initPubKey);
    7.         System.out.println("初始私钥为: " + initPriKey);
    8.         //生成工作秘钥
    9.         SM2KeyVO serverKey = SM2EncDecUtils.generateKeyPair();
    10.         String serverPubKey = serverKey.getPubHexInSoft();
    11.         String serverPriKey = serverKey.getPriHexInSoft();
    12.         System.out.println("服务端公钥为: " + serverPubKey);
    13.         System.out.println("服务端私钥为: " + serverPriKey);
    14.         //使用初始公钥加密服务端公钥 注意格式字节数组
    15.         String encryptServerPubKey = SM2EncDecUtils.encrypt(Convert.hexToBytes(initPubKey), serverPubKey.getBytes());
    16.         System.out.println("加密后公钥："+encryptServerPubKey);
    17.         //使用初始私钥解密服务端公钥 注意格式
    18.         byte[] decrypt = SM2EncDecUtils.decrypt(Convert.hexToBytes(initPriKey), Convert.hexToBytes(encryptServerPubKey));
    19.         System.out.println("解密后服务端公钥："+new String(decrypt));
    20.         if (serverPubKey.equals(new String(decrypt)))
    21.             System.out.println("——————————解密成功——————————");
    22.  
    23.     }

    结果：

     至此，SM2的公私钥生成以及加解密就完成了，下一期内容为生成Sign以及验证。

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