国密SM2加解密Java工具类(附前端VUE代码)
1、SM2简述 RSA算法的危机在于其存在亚指数算法，对ECC算法而言一般没有亚指数攻击算法。 SM2椭圆曲线公钥密码算法：我国自主知识产权的商用密码算法，是ECC（Elliptic Curve Cryptosystem）算法的一种，基于椭圆曲线离散对数问题，计算复杂度是指数级，求解难度较大，同等安全程度要求下，椭圆曲线密码较其他公钥算法所需密钥长度小很多。 ECC算法描述：用户A选定一条适
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1、SM2简述
RSA算法的危机在于其存在亚指数算法，对ECC算法而言一般没有亚指数攻击算法。
SM2椭圆曲线公钥密码算法：我国自主知识产权的商用密码算法，是ECC（Elliptic Curve Cryptosystem）算法的一种，基于椭圆曲线离散对数问题，计算复杂度是指数级，求解难度较大，同等安全程度要求下，椭圆曲线密码较其他公钥算法所需密钥长度小很多。
ECC算法描述：
- 用户A选定一条适合加密的椭圆曲线Ep(a,b)(如:y2=x3+ax+b)，并取椭圆曲线上一点，作为基点G。
- 用户A选择一个私有密钥k，并生成公开密钥（公钥PB）K=kG。
- 用户A将Ep(a,b)和点（公钥）K，G传给用户B。
- 用户B接到信息后 ，将待传输的明文（M）编码到Ep(a,b)上一点M，并产生一个随机整数r（r<n）。加密开始
- 用户B计算点C1=M+rK；C2=rG。
- 用户B将C1、C2传给用户A。
- 用户A接到信息后，计算C1-kC2，结果就是点M。因为C1-kC2=M+rK-k(rG)=M+rK-r(kG)=M
再对点M进行解码就可以得到明文。
密码学中，描述一条Fp上的椭圆曲线，常用到六个参量：T=(p,a,b,G,n,h)。
（p 、a 、b 用来确定一条椭圆曲线，G为基点，n为点G的阶，h 是椭圆曲线上所有点的个数m与n相除的整数部分）
这几个参量取值的选择，直接影响了加密的安全性。参量值一般要求满足以下几个条件：
- p 当然越大越安全，但越大，计算速度会变慢，200位左右可以满足一般安全要求；
- p≠n×h；
- pt≠1 (mod n)，1≤t<20；
- 4a3+27b2≠0 (mod p)；
- n 为素数；
- h≤4。
2、前后端代码示例
1、Maven依赖
<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.56</version>
</dependency>
2、工具类Util
import java.math.BigInteger;
public class Util {
/**
* 整形转换成网络传输的字节流（字节数组）型数据
*
* @param num 一个整型数据
* @return 4个字节的自己数组
*/
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 4个字节的字节数组
* @return 一个整型数据
*/
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;
}
/**
* 长整形转换成网络传输的字节流（字节数组）型数据
*
* @param num 一个长整型数据
* @return 4个字节的自己数组
*/
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
* @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;
}
/**
* 换字节流（字节数组）型数据转大数字
*
* @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);
}
/**
* 根据字节数组获得值(十六进制数字)
*
* @param bytes
* @return
*/
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
* @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;
}
/**
* 打印十六进制字符串
*
* @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 byte[]
* @return 十六进制char[]
*/
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 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char[]
*/
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();
}
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) {
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;
}
}
3、参数类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 {
//国密参数
public static String[] ecc_param = {
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",
"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",
"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",
"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
};
public static SM2 Instance() {
return new SM2();
}
/** 素数p */
public final BigInteger ecc_p;
/** 系数a */
public final BigInteger ecc_a;
/** 系数b */
public final BigInteger ecc_b;
/** 基点G, G=(xg,yg),其介记为n */
public final BigInteger ecc_n;
/** 坐标x */
public final BigInteger ecc_gx;
/** 坐标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);
}
}
4、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();
}
}
5、功能类SM2EncDecUtils
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 SM2EncDecUtils {
public static final String public_key = "public_key";
public static final String private_key = "private_key";
// 生成随机秘钥对
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());
System.out.println("公钥: " + pubk);
System.out.println("私钥: " + prik);
Map<String, String> result = new HashMap<>();
result.put(public_key, pubk);
result.put(private_key, prik);
return result;
}
// 数据加密
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();
}
// 数据解密
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 = Util.byteToHex(encryptedData);
byte[] c1Bytes = Util.hexToByte(data.substring(0, 130));
int c2Len = encryptedData.length - 97;
byte[] c3 = Util.hexToByte(data.substring(130, 130 + 64));
byte[] c2 = Util.hexToByte(data.substring(194, 194 + 2 * c2Len));
SM2 sm2 = SM2.Instance();
BigInteger userD = new BigInteger(1, privateKey);
// 通过C1实体字节来生成ECPoint
ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);
Cipher cipher = new Cipher();
cipher.Init_dec(userD, c1);
cipher.Decrypt(c2);
cipher.Dofinal(c3);
// 返回解密结果
return c2;
}
public static void main(String[] args) throws Exception {
singleThreadTest();
// mutiThreadTest();
}
private static void singleThreadTest() throws Exception {
String plainText = "sourceText";
byte[] sourceData = plainText.getBytes();
Map<String, String> keymap = generateKeyPair();
long start = System.currentTimeMillis();
int counts = 100;
for (int j = 0; j < counts; j++) {
String cipherText = SM2EncDecUtils.encrypt(Util.hexToByte(keymap.get(public_key)), sourceData);
System.out.println("加密前长度: " + plainText.length() + ";加密后长度: " + cipherText.length());
String plainTextEncripted = new String(SM2EncDecUtils.decrypt(Util.hexToByte(keymap.get(private_key)), Util.hexToByte(cipherText)));
if (plainText.equals(plainTextEncripted)) {
System.out.println("------解密后同原文是否一致: " + plainText.equals(plainTextEncripted) + "----------------------");
}
}
long end = System.currentTimeMillis();
System.out.println("平均耗时:" + (end - start) / counts + "ms。");
}
private static void mutiThreadTest() {
String plainText = "sourceText";
byte[] sourceData = plainText.getBytes();
Map<String, String> keymap = generateKeyPair();
int counts = 10;
for (int i = 0; i < counts; i++) {
new Thread(() -> {
try {
for (int j = 0; j < counts; j++) {
String cipherText = SM2EncDecUtils.encrypt(Util.hexToByte(keymap.get(public_key)), sourceData);
if (!plainText.equals(new String(SM2EncDecUtils.decrypt(Util.hexToByte(keymap.get(private_key)), Util.hexToByte(cipherText))))) {
System.out.println("------解密后同原文不一致:" + Thread.currentThread().getName() + "--------------");
}
}
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(" --------------->线程" + Thread.currentThread().getName() + "执行完成.---------------------");
}
).start();
}
}
}
6、测试
测试结果如下：
公钥: 04D4BDF1A660C728418D685A702C5E16EAA2463471BC23107CBDBBB4AD7AF526F88E89EBC7D3075D826F8323657858A351A709423B18A685CDAD141E671C32E8D4 私钥: 0AC55910CF19346F35324577E7F3F0C544A7823B154B756D63160FD1167992B2 加密前长度: 10，明文为: sourceText 加密后长度: 214，加密后密文为: 0408F3F31B4B19D7C9E655A7711F3901B908EFA8C38F9F06B1B43622D01657B6BED9A7F61DF01DDFF91DDB82C69004C910E70550A982FEDBD87839756F035E8EA653DEAEAB58D35696A16A10BC943CF98776ECEB4DF81823B535A3DDEA71FF46932677EECB2A98077617B5 ------解密后同原文是否一致: true---------------------- 加密前长度: 10，明文为: sourceText 加密后长度: 214，加密后密文为: 04788D945B48902DF9C3D445849A97E86C37E65F6A9E1B3A126DD4942CF0545EE485401EF0F240B7F7CEE69926E42C7697F1064349594E29C7A715F5BC0CE3968B959DB64D0AB53F9CC692ED97E32FBB3CE579AB31B4116F40A8BF380A3B8BB550A525ED92E3233B457336 ------解密后同原文是否一致: true---------------------- 平均耗时:22ms。
可以看出加密长度每次是稳定的，但是加密后密文是不一样的，但是解密后结果都是一样的。
7、VUE代码
const sm2 = require('sm-crypto').sm2
const cipherMode = 1 // 1 - C1C3C2，0 - C1C2C3，默认为1
const publicKey = "04D4BDF1A660C728418D685A702C5E16EAA2463471BC23107CBDBBB4AD7AF526F88E89EBC7D3075D826F8323657858A351A709423B18A685CDAD141E671C32E8D4"
// 加密
export function encrypt(txt) {
let encryptData = sm2.doEncrypt(txt, publicKey, 1) // 加密结果
return '04' + encryptData;
}
注意：最关键的是VUE加密完的密文要加“04”，后端解密才能成功，否则后端解密16进制字符串转字节数组的时候会有问题；
同理后端加密的密文要删除开头的“04”，VUE才能解密成功。通过上面测试结果可以看出密文是以“04”开头的。
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