Java国密加密SM2代码

文章目录

Java国密加密SM2代码
前言
一、SM2是什么？
二、使用步骤
- 1、引入Maven库
- 2、密码工具类
- 3、安全工具类
- 4、SM2工具类
- 5、SM2工具实用类
- 后续更新SM3国密

前言

提示：使用国密算法的意义：
随着金融安全上升到国家安全高度，近年来国家有关机关和监管机构站在国家安全和长远战略的高度提出了推动国密算法应用实施、加强行业安全可控的要求。摆脱对国外技术和产品的过度依赖，建设行业网络安全环境，增强我国行业信息系统的“安全可控”能力显得尤为必要和迫切。

提示：以下是本篇文章正文内容，下面案例可供参考

一、SM2是什么？

SM2算法是一种更先进安全的算法，在我们国家商用密码体系中被用来替换RSA算法。

二、使用步骤

1、引入Maven库

代码如下（示例）：

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

2、密码工具类

代码如下（示例）：

/*** @author weis* @version 1.0.0* @ClassName spring-cloud.com.boot.cloud.sm.Cipher.java* @Description 密码工具类* @createTime 2018年10月28日 14:29:00*/
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[] = SecurityUtils.byteConvert32Bytes(p2.getX().toBigInteger());this.sm3keybase.update(p, 0, p.length);this.sm3c3.update(p, 0, p.length);p = SecurityUtils.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 encInit(Sm2Tool sm2Tool, ECPoint userKey) {AsymmetricCipherKeyPair key = sm2Tool.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 decInit(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[] = SecurityUtils.byteConvert32Bytes(p2.getY().toBigInteger());this.sm3c3.update(p, 0, p.length);this.sm3c3.doFinal(c3, 0);reset();}
}

3、安全工具类

/*** @author weis* @version 1.0.0* @ClassName spring-cloud.com.boot.cloud.sm.SecurityUtils.java* @Description 安全工具类* @createTime 2018年10月28日 14:29:00*/
public class SecurityUtils {/*** 整形转换成网络传输的字节流（字节数组）型数据** @param num <P>传入数据</P>* @Version: 1.0.0* @return: byte <p>4个字节的数组</p>* @date: 2018年10月28日 14:29:00*/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;}/*** 四个字节的字节数据转换成一个整形数据** @param bytes <p>4个字节的数组</p>* @Version: 1.0.0* @return: int <p>一个整型数据</p>* @date: 2018年10月28日 14:29:00*/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;}/*** <p>长整形转换成网络传输的字节流（字节数组）型数据</p>** @param num <p>一个长整型数据</p>* @Version: 1.0.0* @return: byte <p>4个字节的自己数组</p>* @date: 2018年10月28日 14:29:00*/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;}/*** 大数字转换字节流（字节数组）型数据** @param n <p>一个BigInteger数据</p>* @Version: 1.0.0* @return: byte <p>返回byte字节</p>* @date: 2018年10月28日 14:29:00*/public static byte[] byteConvert32Bytes(BigInteger n) {byte[] tamped = null;if (n == null) {return null;}if (n.toByteArray().length == 33) {tamped = new byte[32];System.arraycopy(n.toByteArray(), 1, tamped, 0, 32);} else if (n.toByteArray().length == 32) {tamped = n.toByteArray();} else {tamped = new byte[32];for (int i = 0; i < 32 - n.toByteArray().length; i++) {tamped[i] = 0;}System.arraycopy(n.toByteArray(), 0, tamped, 32 - n.toByteArray().length, n.toByteArray().length);}return tamped;}/*** 换字节流（字节数组）型数据转大数字** @param bytes <p>传入byte数组</p>* @Version: 1.0.0* @return: BigInteger* @date: 2018年10月28日 14:29:00*/public static BigInteger byteConvertInteger(byte[] bytes) {if (bytes[0] < 0) {byte[] temp = new byte[bytes.length + 1];temp[0] = 0;System.arraycopy(bytes, 0, temp, 1, bytes.length);return new BigInteger(temp);}return new BigInteger(bytes);}/*** 根据字节数组获得值(十六进制数字)** @param bytes <p>传入byte数组</p>* @Version: 1.0.0* @return: String* @date: 2018年10月28日 14:29:00*/public static String getHexString(byte[] bytes) {return getHexString(bytes, true);}/*** 根据字节数组获得值(十六进制数字)** @param bytes     <p>传入byte数组</p>* @param upperCase <p>boolean</p>* @Version: 1.0.0* @return: String* @date: 2018年10月28日 14:29:00*/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;}/*** 打印十六进制字符串** @param bytes <p>传入byte数组</p>* @Version: 1.0.0* @return: void* @date: 2018年10月28日 14:29:00*/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("");}/*** 将十六进制字符串转换为字节[]** @param hexString <p>十六进制字符串</p>* @Version: 1.0.0* @return: byte* @date: 2018年10月28日 14:29:00*/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;}/*** 将字符转换为字节** @param c <p>char类型</p>* @Version: 1.0.0* @return: byte* @date: 2018年10月28日 14:29:00*/public static byte charToByte(char c) {return (byte) "0123456789ABCDEF".indexOf(c);}/*** 用于建立十六进制字符的输出的小写字符数组*/private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5','6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};/*** 用于建立十六进制字符的输出的大写字符数组*/private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5','6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};/*** 将字节数组转换为十六进制字符数组** @param data <p>byte[]</p>* @return char[] <p>十六进制char[]</p>* @Version: 1.0.0* @date: 2018年10月28日 14:29:00*/public static char[] encodeHex(byte[] data) {return encodeHex(data, true);}/*** 将字节数组转换为十六进制字符数组** @param data        <p>byte[]</p>* @param toLowerCase <p><code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式</p>* @return char[] <p>十六进制char[]</p>* @Version: 1.0.0* @date: 2018年10月28日 14:29:00*/public static char[] encodeHex(byte[] data, boolean toLowerCase) {return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);}/*** 将字节数组转换为十六进制字符数组** @param data     byte[]* @param toDigits 用于控制输出的char[]* @return 十六进制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;}/*** 将字节数组转换为十六进制字符串** @param data byte[]* @return 十六进制String*/public static String encodeHexString(byte[] data) {return encodeHexString(data, true);}/*** 将字节数组转换为十六进制字符串** @param data        byte[]* @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式* @return 十六进制String*/public static String encodeHexString(byte[] data, boolean toLowerCase) {return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);}/*** 将字节数组转换为十六进制字符串** @param data     byte[]* @param toDigits 用于控制输出的char[]* @return 十六进制String*/protected static String encodeHexString(byte[] data, char[] toDigits) {return new String(encodeHex(data, toDigits));}/*** 将十六进制字符数组转换为字节数组** @param data 十六进制char[]* @return byte[]* @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*/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;}/*** 将十六进制字符转换成一个整数** @param ch    十六进制char* @param index 十六进制字符在字符数组中的位置* @return 一个整数* @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*/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;}/*** 数字字符串转ASCII码字符串** @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;}/*** 十六进制转字符串** @param hexString  十六进制字符串* @param encodeType 编码类型4：Unicode，2：普通编码* @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;}/*** 十六进制字符串装十进制** @param hex 十六进制字符串* @return 十进制数值*/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;}/*** 十六转二进制** @param hex 十六进制字符串* @return 二进制字符串*/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码字符串转数字字符串** @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;}/*** 将十进制转换为指定长度的十六进制字符串** @param algorism  int 十进制数字* @param maxLength int 转换后的十六进制字符串长度* @return String 转换后的十六进制字符串*/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);}/*** 字节数组转为普通字符串（ASCII对应的字符）** @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;}/*** 二进制字符串转十进制** @param binary 二进制字符串* @return 十进制数值*/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;}/*** 十进制转换为十六进制字符串** @param algorism int 十进制的数字* @return String 对应的十六进制字符串*/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字符串前补0，主要用于长度位数不足。** @param str       String 需要补充长度的十六进制字符串* @param maxLength int 补充后十六进制字符串的长度* @return 补充结果*/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;}/*** 将一个字符串转换为int** @param s          String 要转换的字符串* @param defaultInt int 如果出现异常,默认返回的数字* @param radix      int 要转换的字符串是什么进制的,如16 8 10.* @return int 转换后的数字*/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;}/*** 将一个十进制形式的数字字符串转换为int** @param s          String 要转换的字符串* @param defaultInt int 如果出现异常,默认返回的数字* @return int 转换后的数字*/public static int parseToInt(String s, int defaultInt) {int i = 0;try {i = Integer.parseInt(s);} catch (NumberFormatException ex) {i = defaultInt;}return i;}/*** 十六进制串转化为byte数组** @return the array of byte*/public static byte[] hexToByte(String hex)throws IllegalArgumentException {if (hex.length() % 2 != 0) {throw new IllegalArgumentException();}char[] arr = hex.toCharArray();byte[] b = new byte[hex.length() / 2];for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {String swap = "" + arr[i++] + arr[i];int byteint = Integer.parseInt(swap, 16) & 0xFF;b[j] = new Integer(byteint).byteValue();}return b;}/*** 字节数组转换为十六进制字符串** @param b byte[] 需要转换的字节数组* @return String 十六进制字符串*/public static String byteToHex(byte b[]) {if (b == null) {throw new IllegalArgumentException("Argument b ( byte array ) is null! ");}String hs = "";String stmp = "";for (int n = 0; n < b.length; n++) {stmp = Integer.toHexString(b[n] & 0xff);if (stmp.length() == 1) {hs = hs + "0" + stmp;} else {hs = hs + stmp;}}return hs.toUpperCase();}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;}/*** 二进制字符串转换为byte数组,每个字节以","隔开**/public static byte[] conver2HexToByte(String hex2Str) {//        String [] temp = hex2Str.split(",");byte[] b = new byte[hex2Str.length() / 8];for (int i = 0; i < b.length; i++) {//          System.out.println(hex2Str.substring(i*8, (i+1)*8));b[i] = Long.valueOf(hex2Str.substring(i * 8, (i + 1) * 8), 2).byteValue();}return b;}public static void main(String[] args) {String a = "011001000011001101100100001100110100110001101110011010000111000001011001010101110011100100110110011000010101100001000110011100000101100101010111001101010110100101011001010101110011100001110101010110010011001000111001011101000000000000000000000000000000000000100010000110111001010000100000101100101100011001101011111111010000000100000010111010101000110101000110000000100100010101111000110000001111111101101001010110011000000010100011110010111111011101101011100100011011001100010111111101010111001110000111010010000110010000110011011001000011001101001100011011100110100001110000010110010101011100111001001101100110000101011000010001100111000001011001010101110011010101101001010110010101011100111000011101010101100100110010001110010111010000000000000000000000000000000000";SecurityUtils.conver2HexToByte(a);}}

4、SM2工具类

/*** @author weis* @version 1.0.0* @ClassName spring-cloud.com.boot.cloud.sm.Sm2Tool.java* @Description SM2工具类* @createTime 2018年10月28日 14:29:00*/
public class Sm2Tool {/*** 正式参数** @Version: 1.0.0* @date: 2018年10月28日 14:29:00*/public static String[] ecc_param = {"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF","FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC","28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93","FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123","32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7","BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"};public static Sm2Tool Instance() {return new Sm2Tool();}public final BigInteger ecc_p;public final BigInteger ecc_a;public final BigInteger ecc_b;public final BigInteger ecc_n;public final BigInteger ecc_gx;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_fieldsmen;public final ECFieldElement ecc_gy_fieldsmen;public Sm2Tool() {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_fieldsmen = new Fp(this.ecc_p, this.ecc_gx);this.ecc_gy_fieldsmen = 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_fieldsmen, this.ecc_gy_fieldsmen);this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n);ECKeyGenerationParameters ecc_engender;ecc_engender = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());this.ecc_key_pair_generator = new ECKeyPairGenerator();this.ecc_key_pair_generator.init(ecc_engender);}}

5、SM2工具实用类

/*** @author weis* @version 1.0.0* @ClassName spring-cloud.com.boot.cloud.sm.Sm2Utils.java* @Description SM2工具实用类* @createTime 2018年10月28日 14:29:00*/
public class Sm2Utils {/*** 生成随机秘钥对** @Version: 1.0.0* @return: Map<String, String>* @date: 2018年10月28日 14:29:00*/public static Map<String, String> generateKeyPair() {Sm2Tool sm2Tool = Sm2Tool.Instance();AsymmetricCipherKeyPair key = sm2Tool.ecc_key_pair_generator.generateKeyPair();ECPrivateKeyParameters empiric = (ECPrivateKeyParameters) key.getPrivate();ECPublicKeyParameters scrub = (ECPublicKeyParameters) key.getPublic();//解密密钥BigInteger privateKey = empiric.getD();//加密密钥ECPoint publicKey = scrub.getQ();Map<String, String> resultMap = new HashMap<String, String>();resultMap.put("privateKey", SecurityUtils.byteToHex(privateKey.toByteArray()));resultMap.put("publicKey", SecurityUtils.byteToHex(publicKey.getEncoded()));return resultMap;}/*** 数据加密** @param publicKey <p>公钥</p>* @param data      <p>需要加密的数据</p>* @Version: 1.0.0* @return: String* @date: 2018年10月28日 14:29:00*/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();Sm2Tool sm2Tool = Sm2Tool.Instance();ECPoint userKey = sm2Tool.ecc_curve.decodePoint(publicKey);ECPoint c1 = cipher.encInit(sm2Tool, userKey);cipher.encrypt(source);byte[] c3 = new byte[32];cipher.dofinal(c3);//C1 C2 C3拼装成加密字串return SecurityUtils.byteToHex(c1.getEncoded()) + SecurityUtils.byteToHex(source) + SecurityUtils.byteToHex(c3);}/*** 数据解密** @param privateKey    <p>私钥</p>* @param encryptedData <p>加密数据</p>* @Version: 1.0.0* @return: byte* @date: 2018年10月28日 14:29:00*/public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException {if (privateKey == null || privateKey.length == 0) {return null;}if (encryptedData == null || encryptedData.length == 0) {return null;}//加密字节数组转换为十六进制的字符串 长度变为encryptedData.length * 2String data = SecurityUtils.byteToHex(encryptedData);/***分解加密字串* （C1 = C1标志位2位 + C1实体部分128位 = 130）* （C3 = C3实体部分64位  = 64）* （C2 = encryptedData.length * 2 - C1长度  - C2长度）*/byte[] c1Bytes = SecurityUtils.hexToByte(data.substring(0, 130));int c2Len = encryptedData.length - 97;byte[] c2 = SecurityUtils.hexToByte(data.substring(130, 130 + 2 * c2Len));byte[] c3 = SecurityUtils.hexToByte(data.substring(130 + 2 * c2Len, 194 + 2 * c2Len));Sm2Tool sm2Tool = Sm2Tool.Instance();BigInteger userD = new BigInteger(1, privateKey);//通过C1实体字节来生成ECPointECPoint c1 = sm2Tool.ecc_curve.decodePoint(c1Bytes);Cipher cipher = new Cipher();cipher.decInit(userD, c1);cipher.Decrypt(c2);cipher.dofinal(c3);//返回解密结果return c2;}public static void main(String[] args) throws Exception {for (int i = 0; i < 200; i++) {//生成密钥对Map<String, String> keyMap = generateKeyPair();String plainText = "pass";//加密密钥String publicKey = keyMap.get("publicKey");//解密密钥String privateKey = keyMap.get("privateKey");String encString = Sm2Utils.encrypt(SecurityUtils.hexStringToBytes(publicKey), plainText.getBytes());System.out.println("密文：" + encString);byte[] plainString = Sm2Utils.decrypt(SecurityUtils.hexStringToBytes(privateKey), SecurityUtils.hexStringToBytes(encString));System.out.println(new String(plainString));}}
}

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Java国密加密SM2代码

Java国密加密SM2代码

文章目录

前言

一、SM2是什么？

二、使用步骤

1、引入Maven库

2、密码工具类

3、安全工具类

4、SM2工具类

5、SM2工具实用类

后续更新SM3国密

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