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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