概述：
本人前端需要实现sm4计算的功能，最好是能做到分多次计算。
本文所写的代码在现有sm4的C++代码，反复测试对比计算过程参数，成功改造成sm4的javascript代码，并成功验证好分多次计算sm4数据
测试平台：
已经在如下环境中测试通过，其他平台(浏览器)应该也不会有问题：
1、nodejs中node.exe运行
本js脚本按照版本ES5编写代码，当然微信小程序也能用。
功能代码:
function strSm4CtxParams() {
this.sk;
};
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
];
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
];
function sm4_init(keyArray, isToEncrypt) {
var sm4CtxParams = new strSm4CtxParams();
var i = 0;
var tmpInt = 0;
sm4CtxParams.sk = new Array(32);
Setkey(sm4CtxParams, keyArray);
if (isToEncrypt == false) {
for (i = 0; i < 16; i++) {
tmpInt = sm4CtxParams.sk[i];
sm4CtxParams.sk[i] = sm4CtxParams.sk[31 - i];
sm4CtxParams.sk[31 - i] = tmpInt;
}
}
//for (i = 0; i < 32; i++) {
// console.log("%dsk=%d", i, sm4CtxParams.sk[i]);
//}
return sm4CtxParams;
}
function sm4_encrypt(sm4CtxParams, byteArrayDataIn) {
return sm4_crypt_round(sm4CtxParams, byteArrayDataIn);
}
function sm4_decrypt(sm4CtxParams, byteArrayDataIn) {
return sm4_crypt_round(sm4CtxParams, byteArrayDataIn);
}
function sm4_crypt_round(sm4CtxParams, byteArrayDataIn) {
//unsigned long i = 0;
//unsigned long ulbuf[36];
var i = 0;
var ulbuf = new Array(36);
var output = new Uint8Array(16);
//memset(ulbuf, 0, sizeof(ulbuf));
for (i = 0; i < ulbuf.length; i++) {
ulbuf[i] = 0;
}
GET_ULONG_BE( ulbuf, 0, byteArrayDataIn, 0 );
GET_ULONG_BE( ulbuf, 1, byteArrayDataIn, 4 );
GET_ULONG_BE( ulbuf, 2, byteArrayDataIn, 8 );
GET_ULONG_BE( ulbuf, 3, byteArrayDataIn, 12 );
i = 0;
while(i<32) {
ulbuf[i+4] = F(ulbuf[i], ulbuf[i+1], ulbuf[i+2], ulbuf[i+3], sm4CtxParams.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);
return output;
}
function GET_ULONG_BE(n, nindex, b,i) {
n[nindex] = ( (parseInt(b[(i) ]) & 0xff) << 24 )
| ( (parseInt(b[(i) + 1]) & 0xff) << 16 )
| ( (parseInt(b[(i) + 2]) & 0xff) << 8 )
| ( (parseInt(b[(i) + 3]) & 0xff) );
}
function PUT_ULONG_BE(n, nindex, b,i){
(b)[(i) ] = ( (n[nindex]) >> 24 ) & 0xff;
(b)[(i) + 1] = ( (n[nindex]) >> 16 ) & 0xff;
(b)[(i) + 2] = ( (n[nindex]) >> 8 ) & 0xff;
(b)[(i) + 3] = ( (n[nindex]) ) & 0xff;
}
function SHL(x,n) {
return (((x) & 0xFFFFFFFF) << (n%32));
}
function ROTL(x,n) {
return (SHL((x),(n)) | ((x) >>> (32 - ((n)%32))));
}
function Lt(ka) {
//unsigned long bb = 0;
//unsigned long c = 0;
//unsigned char a[4];
//unsigned char b[4];
var a = new Uint8Array(4);
var b = new Uint8Array(4);
var tmpInt = new Array(1);
var bb = 0;
tmpInt[0] = ka;
PUT_ULONG_BE(tmpInt,0,a,0);
ka = tmpInt[0];
b[0] = Sbox(a[0]);
b[1] = Sbox(a[1]);
b[2] = Sbox(a[2]);
b[3] = Sbox(a[3]);
tmpInt[0] = bb;
GET_ULONG_BE(tmpInt,0,b,0);
bb = tmpInt[0];
return bb^(ROTL(bb, 2))^(ROTL(bb, 10))^(ROTL(bb, 18))^(ROTL(bb, 24));
//return c;
}
function F(x0, x1, x2, x3, rk) {
return (x0^Lt(x1^x2^x3^rk));
}
function Sbox(inch)
{
//unsigned char *pTable = (unsigned char*)SboxTable;
//unsigned char retVal = (unsigned char)(pTable[inch]);
//return retVal;
return SboxTable[inch];
}
function CalciRK(ka) {
//unsigned long bb = 0;
//unsigned long rk = 0;
//unsigned char a[4];
//unsigned char b[4];
var bb = 0;
var rk = 0;
var a = new Uint8Array(4);
var b = new Uint8Array(4);
var tmpInt = new Array(1);
tmpInt[0] = ka;
PUT_ULONG_BE(tmpInt, 0, a, 0);
ka = tmpInt[0];
//console.log("ka = %d a = %d %d %d %d", ka, a[0], a[1], a[2], a[3]);
b[0] = Sbox(a[0]);
b[1] = Sbox(a[1]);
b[2] = Sbox(a[2]);
b[3] = Sbox(a[3]);
tmpInt[0] = bb;
GET_ULONG_BE(tmpInt, 0, b, 0);
bb = tmpInt[0];
rk = bb^(ROTL(bb, 13))^(ROTL(bb, 23));
//console.log("rk = %d", rk);
return rk;
}
function Setkey(sm4CtxParams, key) {
//unsigned long MK[4];
//unsigned long k[36];
//unsigned long i = 0;
var i = 0;
var MK = new Array(4);
var k = new Array(36);
GET_ULONG_BE(MK, 0, key, 0 );
GET_ULONG_BE(MK, 1, key, 4 );
GET_ULONG_BE(MK, 2, key, 8 );
GET_ULONG_BE(MK, 3, key, 12 );
//console.log("mk = %d %d %d %d", MK[0], MK[1], MK[2], MK[3]);
k[0] = MK[0]^FK[0];
k[1] = MK[1]^FK[1];
k[2] = MK[2]^FK[2];
k[3] = MK[3]^FK[3];
//console.log("k = %d %d %d %d", k[0], k[1], k[2], k[3]);
for(; i<32; i++) {
k[i+4] = k[i] ^ (CalciRK(k[i+1]^k[i+2]^k[i+3]^CK[i]));
sm4CtxParams.sk[i] = k[i+4];
//console.log("sk%d=%d", i, sm4CtxParams.sk[i]);
//return;
}
}
function sm4_str_to_array(strIn) {
var bytesArray = new Uint8Array(strIn.length);
var i = 0;
for (i = 0; i < strIn.length; i++) {
bytesArray[i] = strIn.charCodeAt(i);
}
return bytesArray;
}
function sm4_hex_to_array(hexStrIn) {
var i = 0;
var cnt = 0;
var ele = 0;
var bytesArray = null;
cnt = 0;
for (i = 0; i < hexStrIn.length; i++) {
ele = hexStrIn.charCodeAt(i);
if (ele >= 48 && ele < 48 + 10) {
cnt++;
}
if (ele >= 65 && ele < 65 + 6) {
cnt++;
}
if (ele >= 97 && ele < 97 + 6) {
cnt++;
}
}
bytesArray = new Uint8Array(parseInt((cnt + 1) / 2));
cnt = 0;
for (i = 0; i < hexStrIn.length; i++) {
ele = hexStrIn.charCodeAt(i);
if (ele >= 48 && ele < 48 + 10) {
ele -= 48;
cnt++;
} else if (ele >= 65 && ele < 65 + 6) {
ele = ele - 65 + 10;
cnt++;
} else if (ele >= 97 && ele < 97 + 6) {
ele = ele - 97 + 10;
cnt++;
} else {
continue;
}
if ((cnt % 2) == 1) {
bytesArray[parseInt((cnt - 1) / 2)] = (ele << 4) & 0xF0;
} else {
bytesArray[parseInt((cnt - 1) / 2)] |= ele;
}
}
return bytesArray;
}
function sm4_hex_to_str(data, len) {
var hex_digits = "0123456789abcdef";
var output = new String();
var i = 0;
for (i = 0; i < len; i++) {
output += hex_digits.charAt((data[i] >>> 4) & 0x0f);
output += hex_digits.charAt((data[i]) & 0x0f);
}
return output;
}
测试代码：
var sm4Ctx = null;
var result = null;
var result2 = null;
sm4Ctx = sm4_init(sm4_hex_to_array("00112233445566778888888800000000"), true);
result = sm4_encrypt(sm4Ctx, sm4_hex_to_array("1234567890ABCDEF0000007788552233"));
console.log("sm4 encrypt:" + sm4_hex_to_str(result, 16));
sm4Ctx = sm4_init(sm4_hex_to_array("00112233445566778888888800000000"), false);
result2 = sm4_decrypt(sm4Ctx, result);
console.log("sm4 decrypt:" + sm4_hex_to_str(result2, 16));
测试结果：
加密的数据，能够解密得到原来的明文数据。经过其他平台工具验证，结果是对的。
