SM4加解密

基于开源项目：https://github.com/ZZMarquis/gmhelper

@Testpublic void test(){String str = "adf4976d917a07e0513dce45b6981919";String miwei = "{\"你好\":\"2020\"}";String abc = "";byte[] cipherText = null;byte[] decryptedData = null;try {byte[] key = Util.hexStringToBytes(str);byte[] b1 = miwei.getBytes();System.out.println("SM4 CBC NoPadding encrypt result:\n" + Arrays.toString(b1));System.out.println("SM4 CBC NoPadding encrypt result:\n" + new String(b1,"UTF-8"));cipherText = SM4Util.encrypt_ECB_Padding(key, b1);System.out.println("SM4 ECB NoPadding encrypt result:\n" + ByteUtils.toHexString(cipherText));decryptedData = SM4Util.decrypt_ECB_Padding(key,cipherText);System.out.println("SM4 ECB NoPadding decrypt result:\n" + new String(decryptedData,"UTF-8"));}catch(Exception e){e.printStackTrace();}}

新增字符帮助类：

package org.zz.gmhelper;import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.BigIntegers;import java.io.IOException;
import java.math.BigInteger;
import java.util.Arrays;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 true 传换成小写格式 ， false 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 true 传换成小写格式 ， false 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 String 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 String 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.toLowerCase();//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;}public static ECPoint decodePoint(byte[] var1) {ECPoint var2 = null;int var3 = 111;byte var4 = var1[0];BigInteger var5;BigInteger var6;switch(var4) {case 0:if(var1.length != 1) {throw new IllegalArgumentException("Incorrect length for infinity encoding");}/*var2 = this.getInfinity();*/break;case 1:case 5:default:throw new IllegalArgumentException("Invalid point encoding 0x" + Integer.toString(var4, 16));case 2:case 3:if(var1.length != var3 + 1) {throw new IllegalArgumentException("Incorrect length for compressed encoding");}int var7 = var4 & 1;var6 = BigIntegers.fromUnsignedByteArray(var1, 1, var3);/*var2 = this.decompressPoint(var7, var6);if(!var2.satisfiesCofactor()) {throw new IllegalArgumentException("Invalid point");}*/break;case 4:if(var1.length != 2 * var3 + 1) {throw new IllegalArgumentException("Incorrect length for uncompressed encoding");}var5 = BigIntegers.fromUnsignedByteArray(var1, 1, var3);var6 = BigIntegers.fromUnsignedByteArray(var1, 1 + var3, var3);/* var2 = this.validatePoint(var5, var6);*/break;case 6:case 7:if(var1.length != 2 * var3 + 1) {throw new IllegalArgumentException("Incorrect length for hybrid encoding");}var5 = BigIntegers.fromUnsignedByteArray(var1, 1, var3);var6 = BigIntegers.fromUnsignedByteArray(var1, 1 + var3, var3);if(var6.testBit(0) != (var4 == 7)) {throw new IllegalArgumentException("Inconsistent Y coordinate in hybrid encoding");}/*var2 = this.validatePoint(var5, var6);*/}if(var4 != 0 && var2.isInfinity()) {throw new IllegalArgumentException("Invalid infinity encoding");} else {return var2;}}}

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