Maven依賴

<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.56</version> </dependency>

工具類

import java.math.BigInteger;public class Util {/*** 整形轉換成網絡傳輸的字節流（字節數組）型數據** @param num 一個整型數據* @return 4個字節的自己數組*/public static byte[] intToBytes(int num) {byte[] bytes = new byte[4];bytes[0] = (byte) (0xff & (num >> 0));bytes[1] = (byte) (0xff & (num >> 8));bytes[2] = (byte) (0xff & (num >> 16));bytes[3] = (byte) (0xff & (num >> 24));return bytes;}/*** 四個字節的字節數據轉換成一個整形數據** @param bytes 4個字節的字節數組* @return 一個整型數據*/public static int byteToInt(byte[] bytes) {int num = 0;int temp;temp = (0x000000ff & (bytes[0])) << 0;num = num | temp;temp = (0x000000ff & (bytes[1])) << 8;num = num | temp;temp = (0x000000ff & (bytes[2])) << 16;num = num | temp;temp = (0x000000ff & (bytes[3])) << 24;num = num | temp;return num;}/*** 長整形轉換成網絡傳輸的字節流（字節數組）型數據** @param num 一個長整型數據* @return 4個字節的自己數組*/public static byte[] longToBytes(long num) {byte[] bytes = new byte[8];for (int i = 0; i < 8; i++) {bytes[i] = (byte) (0xff & (num >> (i * 8)));}return bytes;}/*** 大數字轉換字節流（字節數組）型數據** @param n* @return*/public static byte[] byteConvert32Bytes(BigInteger n) {byte tmpd[] = (byte[]) null;if (n == null) {return null;}if (n.toByteArray().length == 33) {tmpd = new byte[32];System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);} else if (n.toByteArray().length == 32) {tmpd = n.toByteArray();} else {tmpd = new byte[32];for (int i = 0; i < 32 - n.toByteArray().length; i++) {tmpd[i] = 0;}System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);}return tmpd;}/*** 換字節流（字節數組）型數據轉大數字** @param b* @return*/public static BigInteger byteConvertInteger(byte[] b) {if (b[0] < 0) {byte[] temp = new byte[b.length + 1];temp[0] = 0;System.arraycopy(b, 0, temp, 1, b.length);return new BigInteger(temp);}return new BigInteger(b);}/*** 根據字節數組獲得值(十六進制數字)** @param bytes* @return*/public static String getHexString(byte[] bytes) {return getHexString(bytes, true);}/*** 根據字節數組獲得值(十六進制數字)** @param bytes* @param upperCase* @return*/public static String getHexString(byte[] bytes, boolean upperCase) {String ret = "";for (int i = 0; i < bytes.length; i++) {ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);}return upperCase ? ret.toUpperCase() : ret;}/*** 打印十六進制字符串** @param bytes*/public static void printHexString(byte[] bytes) {for (int i = 0; i < bytes.length; i++) {String hex = Integer.toHexString(bytes[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}System.out.print("0x" + hex.toUpperCase() + ",");}System.out.println("");}/*** Convert hex string to byte[]** @param hexString the hex string* @return byte[]*/public static byte[] hexStringToBytes(String hexString) {if (hexString == null || hexString.equals("")) {return null;}hexString = hexString.toUpperCase();int length = hexString.length() / 2;char[] hexChars = hexString.toCharArray();byte[] d = new byte[length];for (int i = 0; i < length; i++) {int pos = i * 2;d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));}return d;}/*** Convert char to byte** @param c char* @return byte*/public static byte charToByte(char c) {return (byte) "0123456789ABCDEF".indexOf(c);}/*** 用于建立十六進制字符的輸出的小寫字符數組*/private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5','6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};/*** 用于建立十六進制字符的輸出的大寫字符數組*/private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5','6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};/*** 將字節數組轉換為十六進制字符數組** @param data byte[]* @return 十六進制char[]*/public static char[] encodeHex(byte[] data) {return encodeHex(data, true);}/*** 將字節數組轉換為十六進制字符數組** @param data byte[]* @param toLowerCase <code>true</code> 傳換成小寫格式 ， <code>false</code> 傳換成大寫格式* @return 十六進制char[]*/public static char[] encodeHex(byte[] data, boolean toLowerCase) {return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);}/*** 將字節數組轉換為十六進制字符數組** @param data byte[]* @param toDigits 用于控制輸出的char[]* @return 十六進制char[]*/protected static char[] encodeHex(byte[] data, char[] toDigits) {int l = data.length;char[] out = new char[l << 1];// two characters form the hex value.for (int i = 0, j = 0; i < l; i++) {out[j++] = toDigits[(0xF0 & data[i]) >>> 4];out[j++] = toDigits[0x0F & data[i]];}return out;}/*** 將字節數組轉換為十六進制字符串** @param data byte[]* @return 十六進制String*/public static String encodeHexString(byte[] data) {return encodeHexString(data, true);}/*** 將字節數組轉換為十六進制字符串** @param data byte[]* @param toLowerCase <code>true</code> 傳換成小寫格式 ， <code>false</code> 傳換成大寫格式* @return 十六進制String*/public static String encodeHexString(byte[] data, boolean toLowerCase) {return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);}/*** 將字節數組轉換為十六進制字符串** @param data byte[]* @param toDigits 用于控制輸出的char[]* @return 十六進制String*/protected static String encodeHexString(byte[] data, char[] toDigits) {return new String(encodeHex(data, toDigits));}/*** 將十六進制字符數組轉換為字節數組** @param data 十六進制char[]* @return byte[]* @throws RuntimeException 如果源十六進制字符數組是一個奇怪的長度，將拋出運行時異常*/public static byte[] decodeHex(char[] data) {int len = data.length;if ((len & 0x01) != 0) {throw new RuntimeException("Odd number of characters.");}byte[] out = new byte[len >> 1];// two characters form the hex value.for (int i = 0, j = 0; j < len; i++) {int f = toDigit(data[j], j) << 4;j++;f = f | toDigit(data[j], j);j++;out[i] = (byte) (f & 0xFF);}return out;}/*** 將十六進制字符轉換成一個整數** @param ch 十六進制char* @param index 十六進制字符在字符數組中的位置* @return 一個整數* @throws RuntimeException 當ch不是一個合法的十六進制字符時，拋出運行時異常*/protected static int toDigit(char ch, int index) {int digit = Character.digit(ch, 16);if (digit == -1) {throw new RuntimeException("Illegal hexadecimal character " + ch+ " at index " + index);}return digit;}/*** 數字字符串轉ASCII碼字符串** @param content 字符串* @return ASCII字符串*/public static String StringToAsciiString(String content) {String result = "";int max = content.length();for (int i = 0; i < max; i++) {char c = content.charAt(i);String b = Integer.toHexString(c);result = result + b;}return result;}/*** 十六進制轉字符串** @param hexString 十六進制字符串* @param encodeType 編碼類型4：Unicode，2：普通編碼* @return 字符串*/public static String hexStringToString(String hexString, int encodeType) {String result = "";int max = hexString.length() / encodeType;for (int i = 0; i < max; i++) {char c = (char) hexStringToAlgorism(hexString.substring(i * encodeType, (i + 1) * encodeType));result += c;}return result;}/*** 十六進制字符串裝十進制** @param hex 十六進制字符串* @return 十進制數值*/public static int hexStringToAlgorism(String hex) {hex = hex.toUpperCase();int max = hex.length();int result = 0;for (int i = max; i > 0; i--) {char c = hex.charAt(i - 1);int algorism = 0;if (c >= '0' && c <= '9') {algorism = c - '0';} else {algorism = c - 55;}result += Math.pow(16, max - i) * algorism;}return result;}/*** 十六轉二進制** @param hex 十六進制字符串* @return 二進制字符串*/public static String hexStringToBinary(String hex) {hex = hex.toUpperCase();String result = "";int max = hex.length();for (int i = 0; i < max; i++) {char c = hex.charAt(i);switch (c) {case '0':result += "0000";break;case '1':result += "0001";break;case '2':result += "0010";break;case '3':result += "0011";break;case '4':result += "0100";break;case '5':result += "0101";break;case '6':result += "0110";break;case '7':result += "0111";break;case '8':result += "1000";break;case '9':result += "1001";break;case 'A':result += "1010";break;case 'B':result += "1011";break;case 'C':result += "1100";break;case 'D':result += "1101";break;case 'E':result += "1110";break;case 'F':result += "1111";break;}}return result;}/*** ASCII碼字符串轉數字字符串** @param content ASCII字符串* @return 字符串*/public static String AsciiStringToString(String content) {String result = "";int length = content.length() / 2;for (int i = 0; i < length; i++) {String c = content.substring(i * 2, i * 2 + 2);int a = hexStringToAlgorism(c);char b = (char) a;String d = String.valueOf(b);result += d;}return result;}/*** 將十進制轉換為指定長度的十六進制字符串** @param algorism int 十進制數字* @param maxLength int 轉換后的十六進制字符串長度* @return String 轉換后的十六進制字符串*/public static String algorismToHexString(int algorism, int maxLength) {String result = "";result = Integer.toHexString(algorism);if (result.length() % 2 == 1) {result = "0" + result;}return patchHexString(result.toUpperCase(), maxLength);}/*** 字節數組轉為普通字符串（ASCII對應的字符）** @param bytearray byte[]* @return String*/public static String byteToString(byte[] bytearray) {String result = "";char temp;int length = bytearray.length;for (int i = 0; i < length; i++) {temp = (char) bytearray[i];result += temp;}return result;}/*** 二進制字符串轉十進制** @param binary 二進制字符串* @return 十進制數值*/public static int binaryToAlgorism(String binary) {int max = binary.length();int result = 0;for (int i = max; i > 0; i--) {char c = binary.charAt(i - 1);int algorism = c - '0';result += Math.pow(2, max - i) * algorism;}return result;}/*** 十進制轉換為十六進制字符串** @param algorism int 十進制的數字* @return String 對應的十六進制字符串*/public static String algorismToHEXString(int algorism) {String result = "";result = Integer.toHexString(algorism);if (result.length() % 2 == 1) {result = "0" + result;}result = result.toUpperCase();return result;}/*** HEX字符串前補0，主要用于長度位數不足。** @param str String 需要補充長度的十六進制字符串* @param maxLength int 補充后十六進制字符串的長度* @return 補充結果*/static public String patchHexString(String str, int maxLength) {String temp = "";for (int i = 0; i < maxLength - str.length(); i++) {temp = "0" + temp;}str = (temp + str).substring(0, maxLength);return str;}/*** 將一個字符串轉換為int** @param s String 要轉換的字符串* @param defaultInt int 如果出現異常,默認返回的數字* @param radix int 要轉換的字符串是什么進制的,如16 8 10.* @return int 轉換后的數字*/public static int parseToInt(String s, int defaultInt, int radix) {int i = 0;try {i = Integer.parseInt(s, radix);} catch (NumberFormatException ex) {i = defaultInt;}return i;}/*** 將一個十進制形式的數字字符串轉換為int** @param s String 要轉換的字符串* @param defaultInt int 如果出現異常,默認返回的數字* @return int 轉換后的數字*/public static int parseToInt(String s, int defaultInt) {int i = 0;try {i = Integer.parseInt(s);} catch (NumberFormatException ex) {i = defaultInt;}return i;}/*** 十六進制串轉化為byte數組** @return the array of byte*/public static byte[] hexToByte(String hex)throws IllegalArgumentException {if (hex.length() % 2 != 0) {throw new IllegalArgumentException();}if (hex.length() < 1) {return null;} else {byte[] result = new byte[hex.length() / 2];int j = 0;for(int i = 0; i < hex.length(); i+=2) {result[j++] = (byte)Integer.parseInt(hex.substring(i,i+2), 16);}return result;}}/*** 字節數組轉換為十六進制字符串** @param b byte[] 需要轉換的字節數組* @return String 十六進制字符串*/public static String byteToHex(byte b[]) {if (b == null) {return "";}StringBuffer sb = new StringBuffer();for(int i = 0; i < b.length; i++) {String hex = Integer.toHexString(b[i] & 0xFF);if(hex.length() < 2) {hex = "0" + hex;}sb.append(hex.toUpperCase());}return sb.toString();}public static byte[] subByte(byte[] input, int startIndex, int length) {byte[] bt = new byte[length];for (int i = 0; i < length; i++) {bt[i] = input[i + startIndex];}return bt;} }

SM2

import org.bouncycastle.crypto.generators.ECKeyPairGenerator; import org.bouncycastle.crypto.params.ECDomainParameters; import org.bouncycastle.crypto.params.ECKeyGenerationParameters; import org.bouncycastle.math.ec.ECCurve; import org.bouncycastle.math.ec.ECFieldElement; import org.bouncycastle.math.ec.ECFieldElement.Fp; import org.bouncycastle.math.ec.ECPoint;import java.math.BigInteger; import java.security.SecureRandom;public class SM2 {//國密參數public static String[] ecc_param = {"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF","FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC","28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93","FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123","32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7","BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"};public static SM2 Instance() {return new SM2();}/** 素數p */public final BigInteger ecc_p;/** 系數a */public final BigInteger ecc_a;/** 系數b */public final BigInteger ecc_b;/** 基點G, G=(xg,yg),其介記為n */public final BigInteger ecc_n;/** 坐標x */public final BigInteger ecc_gx;/** 坐標y */public final BigInteger ecc_gy;public final ECCurve ecc_curve;public final ECPoint ecc_point_g;public final ECDomainParameters ecc_bc_spec;public final ECKeyPairGenerator ecc_key_pair_generator;public final ECFieldElement ecc_gx_fieldelement;public final ECFieldElement ecc_gy_fieldelement;public SM2() {this.ecc_p = new BigInteger(ecc_param[0], 16);this.ecc_a = new BigInteger(ecc_param[1], 16);this.ecc_b = new BigInteger(ecc_param[2], 16);this.ecc_n = new BigInteger(ecc_param[3], 16);this.ecc_gx = new BigInteger(ecc_param[4], 16);this.ecc_gy = new BigInteger(ecc_param[5], 16);this.ecc_gx_fieldelement = new Fp(this.ecc_p, this.ecc_gx);this.ecc_gy_fieldelement = new Fp(this.ecc_p, this.ecc_gy);this.ecc_curve = new ECCurve.Fp(this.ecc_p, this.ecc_a, this.ecc_b);this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement, this.ecc_gy_fieldelement);this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n);ECKeyGenerationParameters ecc_ecgenparam;ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());this.ecc_key_pair_generator = new ECKeyPairGenerator();this.ecc_key_pair_generator.init(ecc_ecgenparam);} }

Cipher

import org.bouncycastle.crypto.AsymmetricCipherKeyPair; import org.bouncycastle.crypto.digests.SM3Digest; import org.bouncycastle.crypto.params.ECPrivateKeyParameters; import org.bouncycastle.crypto.params.ECPublicKeyParameters; import org.bouncycastle.math.ec.ECPoint;import java.math.BigInteger;public class Cipher {private int ct;private ECPoint p2;private SM3Digest sm3keybase;private SM3Digest sm3c3;private byte key[];private byte keyOff;public Cipher(){this.ct = 1;this.key = new byte[32];this.keyOff = 0;}private void Reset(){this.sm3keybase = new SM3Digest();this.sm3c3 = new SM3Digest();byte p[] = Util.byteConvert32Bytes(p2.getX().toBigInteger());this.sm3keybase.update(p, 0, p.length);this.sm3c3.update(p, 0, p.length);p = Util.byteConvert32Bytes(p2.getY().toBigInteger());this.sm3keybase.update(p, 0, p.length);this.ct = 1;NextKey();}private void NextKey(){SM3Digest sm3keycur = new SM3Digest(this.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);this.keyOff = 0;this.ct++;}public ECPoint Init_enc(SM2 sm2, ECPoint userKey){AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();BigInteger k = ecpriv.getD();ECPoint c1 = ecpub.getQ();this.p2 = userKey.multiply(k);Reset();return c1;}public void Encrypt(byte data[]){this.sm3c3.update(data, 0, data.length);for (int i = 0; i < data.length; i++){if (keyOff == key.length){NextKey();}data[i] ^= key[keyOff++];}}public void Init_dec(BigInteger userD, ECPoint c1){this.p2 = c1.multiply(userD);Reset();}public void Decrypt(byte data[]){for (int i = 0; i < data.length; i++){if (keyOff == key.length){NextKey();}data[i] ^= key[keyOff++];}this.sm3c3.update(data, 0, data.length);}public void Dofinal(byte c3[]){byte p[] = Util.byteConvert32Bytes(p2.getY().toBigInteger());this.sm3c3.update(p, 0, p.length);this.sm3c3.doFinal(c3, 0);Reset();} }

SM2Utils

import org.bouncycastle.crypto.AsymmetricCipherKeyPair; import org.bouncycastle.crypto.params.ECPrivateKeyParameters; import org.bouncycastle.crypto.params.ECPublicKeyParameters; import org.bouncycastle.math.ec.ECPoint;import java.io.IOException; import java.math.BigInteger; import java.util.HashMap; import java.util.Map;public class SM2Utils{public static final String PUBLICKEY = "public_key";public static final String PRIVATEKEY = "private_key";// 生成隨機秘鑰對public static Map<String, String> generateKeyPair() {SM2 sm2 = SM2.Instance();AsymmetricCipherKeyPair key = null;while (true) {key = sm2.ecc_key_pair_generator.generateKeyPair();if (((ECPrivateKeyParameters) key.getPrivate()).getD().toByteArray().length == 32) {break;}}ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();BigInteger privateKey = ecpriv.getD();ECPoint publicKey = ecpub.getQ();String pubk = Util.byteToHex(publicKey.getEncoded());String prik = Util.byteToHex(privateKey.toByteArray());Map<String, String> result = new HashMap<>();result.put(PUBLICKEY, pubk);result.put(PRIVATEKEY, prik);return result;}// 數據加密public static String encrypt(byte[] publicKey, byte[] data) throws IOException {if (publicKey == null || publicKey.length == 0) {return null;}if (data == null || data.length == 0) {return null;}byte[] source = new byte[data.length];System.arraycopy(data, 0, source, 0, data.length);Cipher cipher = new Cipher();SM2 sm2 = SM2.Instance();ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);ECPoint c1 = cipher.Init_enc(sm2, userKey);cipher.Encrypt(source);byte[] c3 = new byte[32];cipher.Dofinal(c3);return new StringBuffer(Util.byteToHex(c1.getEncoded())).append(Util.byteToHex(c3)).append(Util.byteToHex(source)).toString();}// 數據解密public static String decrypt(String privateKey, String encryptedData) throws IOException {if (privateKey == null || privateKey.equals("")) {return null;}if (encryptedData == null || encryptedData.equals("")) {return null;}byte[] data = Util.hexToByte(encryptedData);byte[] privateK = Util.hexToByte(privateKey);// 加密字節數組轉換為十六進制的字符串 長度變為encryptedData.length * 2byte[] c1Bytes = Util.hexToByte(encryptedData.substring(0, 130));int c2Len = data.length - 97;byte[] c3 = Util.hexToByte(encryptedData.substring(130, 130 + 64));byte[] c2 = Util.hexToByte(encryptedData.substring(194, 194 + 2 * c2Len));SM2 sm2 = SM2.Instance();BigInteger userD = new BigInteger(1, privateK);// 通過C1實體字節來生成ECPointECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);Cipher cipher = new Cipher();cipher.Init_dec(userD, c1);cipher.Decrypt(c2);cipher.Dofinal(c3);// 返回解密結果return new String(c2);}public static void main(String[] args) throws Exception {//參數String str = "{\"test\":\"001\"}";System.out.println("參數:" + str);byte[] sourceData = str.getBytes();//獲取公私鑰Map<String, String> keymap = generateKeyPair();System.out.println("公鑰:" + keymap.get(PUBLICKEY));System.out.println("私鑰:" + keymap.get(PRIVATEKEY));String cipherText = SM2EncDecUtils.encrypt(Util.hexToByte(keymap.get(PUBLICKEY)), sourceData);System.out.println("加密:"+cipherText);String plainTextEncripted = SM2EncDecUtils.decrypt(keymap.get(PRIVATEKEY),cipherText);System.out.println("解密:"+plainTextEncripted);}}

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