国密SM4，javaScript加密 java解密
前段时间因工作需要，接触到了SM算法。国密即国家密码局认定的国产密码算法。主要有SM1，SM2，SM3，SM4。密钥长度和分组长度均为128位。
SM1 为对称加密。其加密强度与AES相当。该算法不公开，调用该算法时，需要通过加密芯片的接口进行调用。
SM2为非对称加密，基于ECC。该算法已公开。由于该算法基于ECC，故其签名速度与秘钥生成速度都快于RSA。ECC 256位（SM2采用的就是ECC 256位的一种）安全强度比RSA 2048位高，但运算速度快于RSA。
SM3 消息摘要。可以用MD5作为对比理解。该算法已公开。校验结果为256位。
SM4 无线局域网标准的分组数据算法。对称加密，密钥长度和分组长度均为128位。
SM4网上有许多java代码，但javaScript代码实现缺很少。以下代码是根据Java代码自己写的JavaScript版本：
<!DOCTYPE html<html><head>
<meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <script type="text/javascript" > /** * base64js */ /** * base64js * base64js.toByteArray(d.input) * base64js.fromByteArray(c); * @author c.z.s * @email 1048829253@qq.com * @company * @date 2018-07 * */ (function(r){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=r()}else{if(typeof define===
"function"&&define.amd){define([],r)}else{var e;if(typeof window!=="undefined"){e=window}else{if(typeof global
!=="undefined"){e=global}else{if(typeof self!=="undefined"){e=self}else{e=this}}}e.base64js=r()}}})(function(){
var r,e,t;return function r(e,t,n){function o(i,a){if(!t[i]){if(!e[i]){var u=typeof require=="function"&&require;if(!a&&u){
return u(i,!0)}if(f){return f(i,!0)}var d=new Error("Cannot find module '"+i+"'");throw d.code="MODULE_NOT_FOUND",d}
var c=t[i]={exports:{}};e[i][0].call(c.exports,function(r){var t=e[i][1][r];return o(t?t:r)},c,c.exports,r,e,t,n)}return t[i].exports}
var f=typeof require=="function"&&require;for(var i=0;i<n.length;i++){o(n[i])}return o}({"/":[function(r,e,t){t.byteLength=c;
t.toByteArray=v;t.fromByteArray=s;var n=[];var o=[];var f=typeof Uint8Array!=="undefined"?Uint8Array:Array;
var i="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";for(var a=0,u=i.length;a<u;++a){n[a]=i[a];
o[i.charCodeAt(a)]=a}o["-".charCodeAt(0)]=62;o["_".charCodeAt(0)]=63;function d(r){var e=r.length;if(e%4>0){
throw new Error("Invalid string. Length must be a multiple of 4")}return r[e-2]==="="?2:r[e-1]==="="?1:0}
function c(r){return r.length*3/4-d(r)}function v(r){var e,t,n,i,a;var u=r.length;i=d(r);a=new f(u*3/4-i);t=i>0?u-4:u;
var c=0;for(e=0;e<t;e+=4){n=o[r.charCodeAt(e)]<<18|o[r.charCodeAt(e+1)]<<12|o[r.charCodeAt(e+2)]<<6|o[r.charCodeAt(e+3)];
a[c++]=n>>16&255;a[c++]=n>>8&255;a[c++]=n&255}if(i===2){n=o[r.charCodeAt(e)]<<2|o[r.charCodeAt(e+1)]>>4;a[c++]=n&255}
else{if(i===1){n=o[r.charCodeAt(e)]<<10|o[r.charCodeAt(e+1)]<<4|o[r.charCodeAt(e+2)]>>2;a[c++]=n>>8&255;a[c++]=n&255}}return a}
function l(r){return n[r>>18&63]+n[r>>12&63]+n[r>>6&63]+n[r&63]}function h(r,e,t){var n;var o=[];for(var f=e;f<t;f+=3){
n=(r[f]<<16)+(r[f+1]<<8)+r[f+2];o.push(l(n))}return o.join("")}function s(r){var e;var t=r.length;var o=t%3;var f="";var i=[];
var a=16383;for(var u=0,d=t-o;u<d;u+=a){i.push(h(r,u,u+a>d?d:u+a))}if(o===1){e=r[t-1];f+=n[e>>2];f+=n[e<<4&63];f+="=="}else{if(o===2){
e=(r[t-2]<<8)+r[t-1];f+=n[e>>10];f+=n[e>>4&63];f+=n[e<<2&63];f+="="}}i.push(f);return i.join("")}},{}]},{},[])("/")}); /** * 国密SM4加密算法 * @author c.z.s * @email 1048829253@qq.com * @company GDT-ZWZX-DEV-PT * @date 2018-07 */ function SM4_Context() { this.mode=1; this.isPadding = true; this.sk = new Array(32); } function SM4() { this.SM4_ENCRYPT=1; this.SM4_DECRYPT = 0; var SboxTable = [0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05, 0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99, 0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62, 0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6, 0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8, 0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35, 0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87, 0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e, 0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1, 0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3, 0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f, 0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51, 0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8, 0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0, 0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84, 0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48]; var FK = [ 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc ]; var CK = [ 0x00070e15,0x1c232a31,0x383f464d,0x545b6269, 0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9, 0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249, 0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9, 0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229, 0x30373e45,0x4c535a61,0x686f767d,0x848b9299, 0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209, 0x10171e25,0x2c333a41,0x484f565d,0x646b7279 ]; this.GET_ULONG_BE=function(b,i) { return (b[i] & 0xff) << 24 | ((b[i + 1] & 0xff) << 16) | ((b[i + 2] & 0xff) << 8) | (b[i + 3] & 0xff) & 0xffffffff; } this.PUT_ULONG_BE=function( n, b, i){ var t1=(0xFF & (n >> 24)); var t2=(0xFF & (n >> 16)); var t3=(0xFF & (n >> 8)); var t4=(0xFF & (n)); b[i] = t1>128?t1-256:t1; b[i + 1] = t2>128?t2-256:t2; b[i + 2] = t3>128?t3-256:t3; b[i + 3] = t4>128?t4-256:t4; } this.SHL=function(x,n){ return (x & 0xFFFFFFFF) << n; } this.ROTL=function( x, n){ var s =this.SHL(x, n); var ss= x >> (32 - n); return this.SHL(x, n) | x >> (32 - n); } this.sm4Lt=function(ka){ var bb = 0; var c = 0; var a = new Array(4); var b = new Array(4); this.PUT_ULONG_BE(ka, a, 0); b[0] = this.sm4Sbox(a[0]); b[1] = this.sm4Sbox(a[1]); b[2] = this.sm4Sbox(a[2]); b[3] = this.sm4Sbox(a[3]); bb = this.GET_ULONG_BE(b, 0); c = bb ^ this.ROTL(bb, 2) ^ this.ROTL(bb, 10) ^ this.ROTL(bb, 18) ^ this.ROTL(bb, 24); return c; } this.sm4F=function( x0, x1, x2, x3, rk){ return x0 ^ this.sm4Lt(x1 ^ x2 ^ x3 ^ rk); } this.sm4CalciRK=function(ka){ var bb = 0; var rk = 0; var a = new Array(4); var b = new Array(4); this.PUT_ULONG_BE(ka, a, 0); b[0] = this.sm4Sbox(a[0]); b[1] = this.sm4Sbox(a[1]); b[2] = this.sm4Sbox(a[2]); b[3] = this.sm4Sbox(a[3]); bb = this.GET_ULONG_BE(b, 0); rk = bb ^ this.ROTL(bb, 13) ^ this.ROTL(bb, 23); return rk; } this.sm4Sbox=function(inch){ var i = inch & 0xFF; var retVal = SboxTable[i]; return retVal>128?retVal-256:retVal; } this.sm4_setkey_enc = function(ctx, key){ if (ctx == null) { alert("ctx is null!"); return false; } if (key == null || key.length != 16){ alert("key error!"); return false; } ctx.mode = this.SM4_ENCRYPT; this.sm4_setkey(ctx.sk, key); }; this.sm4_setkey = function(SK, key){ var MK = new Array(4); var k = new Array(36); var i = 0; MK[0] = this.GET_ULONG_BE(key, 0); MK[1] = this.GET_ULONG_BE(key, 4); MK[2] = this.GET_ULONG_BE(key, 8); MK[3] = this.GET_ULONG_BE(key, 12); k[0] = MK[0] ^ FK[0]; k[1] = MK[1] ^ FK[1]; k[2] = MK[2] ^ FK[2]; k[3] = MK[3] ^ FK[3]; for (var i=0; i < 32; i++){ k[(i + 4)] = (k[i] ^ this.sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ CK[i])); SK[i] = k[(i + 4)]; } } this.padding=function(input,mode){ if (input == null){ return null; } var ret = null; if (mode == this.SM4_ENCRYPT){ var p = parseInt(16 - input.length % 16); ret = input.slice(0); for (var i = 0; i < p; i++){ ret[input.length + i] = p; } }else{ var p = input[input.length - 1]; ret=input.slice(0,input.length - p); } return ret; } this.sm4_one_round=function(sk, input, output){ var i = 0; var ulbuf = new Array(36); ulbuf[0] = this.GET_ULONG_BE(input, 0); ulbuf[1] = this.GET_ULONG_BE(input, 4); ulbuf[2] = this.GET_ULONG_BE(input, 8); ulbuf[3] = this.GET_ULONG_BE(input, 12); while (i < 32){ ulbuf[(i + 4)] = this.sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]); i++; } this.PUT_ULONG_BE(ulbuf[35], output, 0); this.PUT_ULONG_BE(ulbuf[34], output, 4); this.PUT_ULONG_BE(ulbuf[33], output, 8); this.PUT_ULONG_BE(ulbuf[32], output, 12); } this.sm4_crypt_ecb=function(ctx,input){ if (input == null){ alert("input is null!"); } if ((ctx.isPadding) && (ctx.mode == this.SM4_ENCRYPT)){ input = this.padding(input, this.SM4_ENCRYPT); } var i=0; var length = input.length; var bous = new Array(); for(; length > 0; length -= 16) { var out = new Array(16); var ins=input.slice(i*16,(16*(i+1))); this.sm4_one_round(ctx.sk, ins, out) bous=bous.concat(out); i++; } var output = bous; if (ctx.isPadding && ctx.mode == this.SM4_DECRYPT) { output = this.padding(output, this.SM4_DECRYPT); } for(var i=0;i<output.length;i++){ if(output[i]<0){ output[i]=output[i]+256; } } return output; } this.sm4_crypt_cbc=function(ctx, iv, input){ if (iv == null || iv.length != 16) { alert("iv error!"); } if (input == null){ alert("input is null!"); } if (ctx.isPadding && ctx.mode == this.SM4_ENCRYPT) { input = this.padding(input, this.SM4_ENCRYPT); } var i = 0; var length = input.length; var bous =new Array(); if (ctx.mode == this.SM4_ENCRYPT){ var k=0; for(; length > 0; length -= 16){ var out = new Array(16); var out1 = new Array(16); var ins=input.slice(k*16,(16*(k+1))); for (i = 0; i < 16; i++) { out[i] = (ins[i] ^ iv[i]); } this.sm4_one_round(ctx.sk, out, out1); iv=out1.slice(0,16); bous=bous.concat(out1); k++; } } else { var temp = []; var k=0; for(; length > 0; length -= 16) { var out = new Array(16); var out1 = new Array(16); var ins=input.slice(k*16,(16*(k+1))); temp=ins.slice(0,16); sm4_one_round(ctx.sk, ins, out); for (i = 0; i < 16; i++) { out1[i] = (out[i] ^ iv[i]); } iv=temp.slice(0,16); bous=bous.concat(out1); k++; } } var output = bous; if (ctx.isPadding && ctx.mode == this.SM4_DECRYPT) { output = this.padding(output, this.SM4_DECRYPT); } for(var i=0;i<output.length;i++){ if(output[i]<0){ output[i]=output[i]+256; } } return output; } } function SM4Util() { this.secretKey="11HDESaAhiHHugDz"; this.iv = ""; this.hexString = false; this.encryptData_ECB=function(plainText){ try{ var sm4 = new SM4(); var ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = sm4.SM4_ENCRYPT; var keyBytes= stringToByte(this.secretKey); sm4.sm4_setkey_enc(ctx, keyBytes); var encrypted = sm4.sm4_crypt_ecb(ctx, stringToByte(plainText)); var cipherText = base64js.fromByteArray(encrypted); if (cipherText != null && cipherText.trim().length > 0) { cipherText.replace(/(\s*|\t|\r|\n)/g, ""); } return cipherText; }catch (e){ console.error(e); return null; } } this.encryptData_CBC=function(plainText){ try{ var sm4 = new SM4(); var ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = sm4.SM4_ENCRYPT; var keyBytes = stringToByte(this.secretKey) ; var ivBytes= stringToByte(this.iv) ; sm4.sm4_setkey_enc(ctx, keyBytes); var encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, stringToByte(plainText)); var cipherText = base64js.fromByteArray(encrypted); if (cipherText != null && cipherText.trim().length > 0) { cipherText.replace(/(\s*|\t|\r|\n)/g, ""); } return cipherText; } catch ( e) { console.error(e); return null; } } stringToByte=function(str) { var bytes = new Array(); var len, c; len = str.length; for(var i = 0; i < len; i++) { c = str.charCodeAt(i); if(c >= 0x010000 && c <= 0x10FFFF) { bytes.push(((c >> 18) & 0x07) | 0xF0); bytes.push(((c >> 12) & 0x3F) | 0x80); bytes.push(((c >> 6) & 0x3F) | 0x80); bytes.push((c & 0x3F) | 0x80); } else if(c >= 0x000800 && c <= 0x00FFFF) { bytes.push(((c >> 12) & 0x0F) | 0xE0); bytes.push(((c >> 6) & 0x3F) | 0x80); bytes.push((c & 0x3F) | 0x80); } else if(c >= 0x000080 && c <= 0x0007FF) { bytes.push(((c >> 6) & 0x1F) | 0xC0); bytes.push((c & 0x3F) | 0x80); } else { bytes.push(c & 0xFF); } } return bytes; } byteToString=function(arr) { if(typeof arr === 'string') { return arr; } var str = '', _arr = arr; for(var i = 0; i < _arr.length; i++) { var one = _arr[i].toString(2), v = one.match(/^1+?(?=0)/); if(v && one.length == 8) { var bytesLength = v[0].length; var store = _arr[i].toString(2).slice(7 - bytesLength); for(var st = 1; st < bytesLength; st++) { store += _arr[st + i].toString(2).slice(2); } str += String.fromCharCode(parseInt(store, 2)); i += bytesLength - 1; } else { str += String.fromCharCode(_arr[i]); } } return str; } }; var s4=new SM4Util(); console.log(s4.encryptData_ECB("ssda撒了ii&$$^##)*&6223';.,[]")); s4.iv="UISwD9fW6cFh9SNS"; console.log(s4.encryptData_CBC("ssda撒了ii&$$^##)*&6223';.,[]")); </script> </body> </html>
java代码是在网上找到用的比较多的版本，直接修改。
由于js是弱类型，不支持long类型，所以在java中的long类型改写为int类型了，代码如下：
SM4Utils.java
package com.encode.sm4; import java.io.IOException; import java.util.regex.Matcher; import java.util.regex.Pattern; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class SM4Utils { private String secretKey = ""; private String iv = ""; private boolean hexString = false; public SM4Utils() { } public String encryptData_ECB(String plainText) { try { SM4_Context ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = SM4.SM4_ENCRYPT; byte[] keyBytes; keyBytes = secretKey.getBytes(); SM4 sm4 = new SM4(); sm4.sm4_setkey_enc(ctx, keyBytes); byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("UTF-8")); String cipherText = new BASE64Encoder().encode(encrypted); if (cipherText != null && cipherText.trim().length() > 0) { Pattern p = Pattern.compile("\\s*|\t|\r|\n"); Matcher m = p.matcher(cipherText); cipherText = m.replaceAll(""); } return cipherText; } catch (Exception e) { e.printStackTrace(); return null; } } public String decryptData_ECB(String cipherText) { try { SM4_Context ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = SM4.SM4_DECRYPT; byte[] keyBytes; keyBytes = secretKey.getBytes(); SM4 sm4 = new SM4(); sm4.sm4_setkey_dec(ctx, keyBytes); byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText)); return new String(decrypted, "UTF-8"); } catch (Exception e) { e.printStackTrace(); return null; } } public String encryptData_CBC(String plainText){ try{ SM4_Context ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = SM4.SM4_ENCRYPT; byte[] keyBytes; byte[] ivBytes; keyBytes = secretKey.getBytes(); ivBytes = iv.getBytes(); SM4 sm4 = new SM4(); sm4.sm4_setkey_enc(ctx, keyBytes); byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("UTF-8")); String cipherText = new BASE64Encoder().encode(encrypted); if (cipherText != null && cipherText.trim().length() > 0) { Pattern p = Pattern.compile("\\s*|\t|\r|\n"); Matcher m = p.matcher(cipherText); cipherText = m.replaceAll(""); } return cipherText; } catch (Exception e) { e.printStackTrace(); return null; } } public String decryptData_CBC(String cipherText) { try { SM4_Context ctx = new SM4_Context(); ctx.isPadding = true; ctx.mode = SM4.SM4_DECRYPT; byte[] keyBytes; byte[] ivBytes; if (hexString) { keyBytes = Util.hexStringToBytes(secretKey); ivBytes = Util.hexStringToBytes(iv); } else { keyBytes = secretKey.getBytes(); ivBytes = iv.getBytes(); } SM4 sm4 = new SM4(); sm4.sm4_setkey_dec(ctx, keyBytes); byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText)); return new String(decrypted, "UTF-8"); } catch (Exception e) { e.printStackTrace(); return null; } } public static void main(String[] args) throws IOException { String plainText ="ssda撒打飞机了ii&$$^##)*&6223';.,[]"; SM4Utils sm4 = new SM4Utils(); sm4.secretKey = "11HDESaAhiHHugDz"; plainText.getBytes("UTF-8"); System.out.println("ECB模式"); String cipherText = sm4.encryptData_ECB(plainText); System.out.println("密文: " + cipherText); System.out.println(""); plainText = sm4.decryptData_ECB(cipherText); System.out.println("明文: " + plainText); System.out.println(""); System.out.println("CBC模式"); sm4.iv = "UISwD9fW6cFh9SNS"; cipherText = sm4.encryptData_CBC(plainText); System.out.println("密文: " + cipherText); System.out.println(""); plainText = sm4.decryptData_CBC(cipherText); System.out.println("明文: " + plainText); //PI4ke7HMoUMD/LOSHWX5/g== } }
SM4.java
package com.encode.sm4; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; public class SM4 { public static final int SM4_ENCRYPT = 1; public static final int SM4_DECRYPT = 0; private int GET_ULONG_BE(byte[] b, int i) { int n = (int)(b[i] & 0xff) << 24 | (int)((b[i + 1] & 0xff) << 16) | (int)((b[i + 2] & 0xff) << 8) | (int)(b[i + 3] & 0xff) & 0xffffffff; return n; } private void PUT_ULONG_BE(int n, byte[] b, int i) { b[i] = (byte)(int)(0xFF & n >> 24); b[i + 1] = (byte)(int)(0xFF & n >> 16); b[i + 2] = (byte)(int)(0xFF & n >> 8); b[i + 3] = (byte)(int)(0xFF & n); } private int SHL(int x, int n) { return (x & 0xFFFFFFFF) << n; } private int ROTL(int x, int n) { return SHL(x, n) | x >> (32 - n); } public static final byte[] SboxTable = { (byte) 0xd6, (byte) 0x90, (byte) 0xe9, (byte) 0xfe, (byte) 0xcc, (byte) 0xe1, 0x3d, (byte) 0xb7, 0x16, (byte) 0xb6, 0x14, (byte) 0xc2, 0x28, (byte) 0xfb, 0x2c, 0x05, 0x2b, 0x67, (byte) 0x9a, 0x76, 0x2a, (byte) 0xbe, 0x04, (byte) 0xc3, (byte) 0xaa, 0x44, 0x13, 0x26, 0x49, (byte) 0x86, 0x06, (byte) 0x99, (byte) 0x9c, 0x42, 0x50, (byte) 0xf4, (byte) 0x91, (byte) 0xef, (byte) 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, (byte) 0xed, (byte) 0xcf, (byte) 0xac, 0x62, (byte) 0xe4, (byte) 0xb3, 0x1c, (byte) 0xa9, (byte) 0xc9, 0x08, (byte) 0xe8, (byte) 0x95, (byte) 0x80, (byte) 0xdf, (byte) 0x94, (byte) 0xfa, 0x75, (byte) 0x8f, 0x3f, (byte) 0xa6, 0x47, 0x07, (byte) 0xa7, (byte) 0xfc, (byte) 0xf3, 0x73, 0x17, (byte) 0xba, (byte) 0x83, 0x59, 0x3c, 0x19, (byte) 0xe6, (byte) 0x85, 0x4f, (byte) 0xa8, 0x68, 0x6b, (byte) 0x81, (byte) 0xb2, 0x71, 0x64, (byte) 0xda, (byte) 0x8b, (byte) 0xf8, (byte) 0xeb, 0x0f, 0x4b, 0x70, 0x56, (byte) 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, (byte) 0xd1, (byte) 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, (byte) 0x87, (byte) 0xd4, 0x00, 0x46, 0x57, (byte) 0x9f, (byte) 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, (byte) 0xe7, (byte) 0xa0, (byte) 0xc4, (byte) 0xc8, (byte) 0x9e, (byte) 0xea, (byte) 0xbf, (byte) 0x8a, (byte) 0xd2, 0x40, (byte) 0xc7, 0x38, (byte) 0xb5, (byte) 0xa3, (byte) 0xf7, (byte) 0xf2, (byte) 0xce, (byte) 0xf9, 0x61, 0x15, (byte) 0xa1, (byte) 0xe0, (byte) 0xae, 0x5d, (byte) 0xa4, (byte) 0x9b, 0x34, 0x1a, 0x55, (byte) 0xad, (byte) 0x93, 0x32, 0x30, (byte) 0xf5, (byte) 0x8c, (byte) 0xb1, (byte) 0xe3, 0x1d, (byte) 0xf6, (byte) 0xe2, 0x2e, (byte) 0x82, 0x66, (byte) 0xca, 0x60, (byte) 0xc0, 0x29, 0x23, (byte) 0xab, 0x0d, 0x53, 0x4e, 0x6f, (byte) 0xd5, (byte) 0xdb, 0x37, 0x45, (byte) 0xde, (byte) 0xfd, (byte) 0x8e, 0x2f, 0x03, (byte) 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, (byte) 0x8d, 0x1b, (byte) 0xaf, (byte) 0x92, (byte) 0xbb, (byte) 0xdd, (byte) 0xbc, 0x7f, 0x11, (byte) 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, (byte) 0xd8, 0x0a, (byte) 0xc1, 0x31, (byte) 0x88, (byte) 0xa5, (byte) 0xcd, 0x7b, (byte) 0xbd, 0x2d, 0x74, (byte) 0xd0, 0x12, (byte) 0xb8, (byte) 0xe5, (byte) 0xb4, (byte) 0xb0, (byte) 0x89, 0x69, (byte) 0x97, 0x4a, 0x0c, (byte) 0x96, 0x77, 0x7e, 0x65, (byte) 0xb9, (byte) 0xf1, 0x09, (byte) 0xc5, 0x6e, (byte) 0xc6, (byte) 0x84, 0x18, (byte) 0xf0, 0x7d, (byte) 0xec, 0x3a, (byte) 0xdc, 0x4d, 0x20, 0x79, (byte) 0xee, 0x5f, 0x3e, (byte) 0xd7, (byte) 0xcb, 0x39, 0x48 }; public static final int[] FK = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc }; public static final int[] CK = { 0x00070e15,0x1c232a31,0x383f464d,0x545b6269, 0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9, 0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249, 0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9, 0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229, 0x30373e45,0x4c535a61,0x686f767d,0x848b9299, 0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209, 0x10171e25,0x2c333a41,0x484f565d,0x646b7279 }; private byte sm4Sbox(byte inch) { int i = inch & 0xFF; byte retVal = SboxTable[i]; return retVal; } private int sm4Lt(int ka) { int bb = 0; int c = 0; byte[] a = new byte[4]; byte[] b = new byte[4]; PUT_ULONG_BE(ka, a, 0); b[0] = sm4Sbox(a[0]); b[1] = sm4Sbox(a[1]); b[2] = sm4Sbox(a[2]); b[3] = sm4Sbox(a[3]); bb = GET_ULONG_BE(b, 0); c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24); return c; } private int sm4F(int x0, int x1, int x2, int x3, int rk) { return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk); } private int sm4CalciRK(int ka) { int bb = 0; int rk = 0; byte[] a = new byte[4]; byte[] b = new byte[4]; PUT_ULONG_BE(ka, a, 0); b[0] = sm4Sbox(a[0]); b[1] = sm4Sbox(a[1]); b[2] = sm4Sbox(a[2]); b[3] = sm4Sbox(a[3]); bb = GET_ULONG_BE(b, 0); rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23); return rk; } private void sm4_setkey(int[] SK, byte[] key) { int[] MK = new int[4]; int[] k = new int[36]; int i = 0; MK[0] = GET_ULONG_BE(key, 0); MK[1] = GET_ULONG_BE(key, 4); MK[2] = GET_ULONG_BE(key, 8); MK[3] = GET_ULONG_BE(key, 12); k[0] = MK[0] ^ (int) FK[0]; k[1] = MK[1] ^ (int) FK[1]; k[2] = MK[2] ^ (int) FK[2]; k[3] = MK[3] ^ (int) FK[3]; for (; i < 32; i++) { k[(i + 4)] = (k[i] ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (int) CK[i])); SK[i] = k[(i + 4)]; } } private void sm4_one_round(int[] sk, byte[] input, byte[] output) { int i = 0; int[] ulbuf = new int[36]; ulbuf[0] = GET_ULONG_BE(input, 0); ulbuf[1] = GET_ULONG_BE(input, 4); ulbuf[2] = GET_ULONG_BE(input, 8); ulbuf[3] = GET_ULONG_BE(input, 12); while (i < 32) { ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]); i++; } PUT_ULONG_BE(ulbuf[35], output, 0); PUT_ULONG_BE(ulbuf[34], output, 4); PUT_ULONG_BE(ulbuf[33], output, 8); PUT_ULONG_BE(ulbuf[32], output, 12); } private byte[] padding(byte[] input, int mode) { if (input == null) { return null; } byte[] ret = (byte[]) null; if (mode == SM4_ENCRYPT) { int p = 16 - input.length % 16; ret = new byte[input.length + p]; System.arraycopy(input, 0, ret, 0, input.length); for (int i = 0; i < p; i++) { ret[input.length + i] = (byte) p; } } else { int p = input[input.length - 1]; ret = new byte[input.length - p]; System.arraycopy(input, 0, ret, 0, input.length - p); } return ret; } public void sm4_setkey_enc(SM4_Context ctx, byte[] key) throws Exception { if (ctx == null) { throw new Exception("ctx is null!"); } if (key == null || key.length != 16) { throw new Exception("key error!"); } ctx.mode = SM4_ENCRYPT; sm4_setkey(ctx.sk, key); } public byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input) throws Exception { if (input == null) { throw new Exception("input is null!"); } if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT)) { input = padding(input, SM4_ENCRYPT); } int length = input.length; ByteArrayInputStream bins = new ByteArrayInputStream(input); ByteArrayOutputStream bous = new ByteArrayOutputStream(); for(; length > 0; length -= 16) { byte[] in = new byte[16]; byte[] out = new byte[16]; bins.read(in); sm4_one_round(ctx.sk, in, out); bous.write(out); } byte[] output = bous.toByteArray(); if (ctx.isPadding && ctx.mode == SM4_DECRYPT) { output = padding(output, SM4_DECRYPT); } bins.close(); bous.close(); return output; } public void sm4_setkey_dec(SM4_Context ctx, byte[] key) throws Exception { if (ctx == null) { throw new Exception("ctx is null!"); } if (key == null || key.length != 16) { throw new Exception("key error!"); } int i = 0; ctx.mode = SM4_DECRYPT; sm4_setkey(ctx.sk, key); for (i = 0; i < 16; i++) { SWAP(ctx.sk, i); } } private void SWAP(int[] sk, int i) { int t = sk[i]; sk[i] = sk[(31 - i)]; sk[(31 - i)] = t; } public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input) throws Exception { if (iv == null || iv.length != 16) { throw new Exception("iv error!"); } if (input == null) { throw new Exception("input is null!"); } if (ctx.isPadding && ctx.mode == SM4_ENCRYPT) { input = padding(input, SM4_ENCRYPT); } int i = 0; int length = input.length; ByteArrayInputStream bins = new ByteArrayInputStream(input); ByteArrayOutputStream bous = new ByteArrayOutputStream(); if (ctx.mode == SM4_ENCRYPT) { for(; length > 0; length -= 16) { byte[] in = new byte[16]; byte[] out = new byte[16]; byte[] out1 = new byte[16]; bins.read(in); for (i = 0; i < 16; i++) { out[i] = ((byte) (in[i] ^ iv[i])); } sm4_one_round(ctx.sk, out, out1); System.arraycopy(out1, 0, iv, 0, 16); bous.write(out1); } } else { byte[] temp = new byte[16]; for(; length > 0; length -= 16) { byte[] in = new byte[16]; byte[] out = new byte[16]; byte[] out1 = new byte[16]; bins.read(in); System.arraycopy(in, 0, temp, 0, 16); sm4_one_round(ctx.sk, in, out); for (i = 0; i < 16; i++) { out1[i] = ((byte) (out[i] ^ iv[i])); } System.arraycopy(temp, 0, iv, 0, 16); bous.write(out1); } } byte[] output = bous.toByteArray(); if (ctx.isPadding && ctx.mode == SM4_DECRYPT) { output = padding(output, SM4_DECRYPT); } bins.close(); bous.close(); return output; } }
SM4_Context.java
package com.encode.sm4; public class SM4_Context { public int mode; public int[] sk; public boolean isPadding; public SM4_Context() { this.mode = 1; this.isPadding = true; this.sk = new int[32]; } }
util.java
package com.encode.sm4; 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 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.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; } }
