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Java国密加密SM2代码详细使用步骤

作者:码上农民

SM2算法可以用较少的计算能力提供比RSA算法更高的安全强度,而所需的密钥长度却远比RSA算法低,下面这篇文章主要给大家介绍了关于Java国密加密SM2代码的相关资料,需要的朋友可以参考下

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 * 2
        String 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ECPoint
        ECPoint 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));

        }


    }
}

总结 

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