@zlattice/lattice-js
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Lattice blockchain TypeScript SDK with dual module support (CJS + ESM)
243 lines • 9.63 kB
JavaScript
// Slower version of SM4, for audit purpose.
// This version is 3-4x slower than the unwrapped version.
import { rotl } from "../../crypto/sm2/sm3.js";
import { arrayToUtf8, hexToArray } from "../../crypto/sm2/utils.js";
import { utf8ToArray } from "../../crypto/sm3/index.js";
import { bytesToHex } from "../../crypto/sm3/utils.js";
/* eslint-disable no-bitwise, no-mixed-operators, complexity */
const DECRYPT = 0;
const ROUND = 32;
const BLOCK = 16;
const Sbox = Uint8Array.from([
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
]);
const CK = new Uint32Array([
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
]);
/**
* 非线性变换
*/
function byteSub(a) {
return (((Sbox[(a >>> 24) & 0xff] & 0xff) << 24) |
((Sbox[(a >>> 16) & 0xff] & 0xff) << 16) |
((Sbox[(a >>> 8) & 0xff] & 0xff) << 8) |
(Sbox[a & 0xff] & 0xff));
}
/**
* 线性变换，加密/解密用
*/
function l1(b) {
return b ^ rotl(b, 2) ^ rotl(b, 10) ^ rotl(b, 18) ^ rotl(b, 24);
}
/**
* 线性变换，生成轮密钥用
*/
function l2(b) {
return b ^ rotl(b, 13) ^ rotl(b, 23);
}
/**
* 以一组 128 比特进行加密/解密操作
*/
const x = new Uint32Array(4);
const tmp = new Uint32Array(4);
function sms4Crypt(input, output, roundKey) {
// 字节数组转成字数组（此处 1 字 = 32 比特）
for (let i = 0; i < 4; i++) {
tmp[0] = input[4 * i] & 0xff;
tmp[1] = input[4 * i + 1] & 0xff;
tmp[2] = input[4 * i + 2] & 0xff;
tmp[3] = input[4 * i + 3] & 0xff;
x[i] = (tmp[0] << 24) | (tmp[1] << 16) | (tmp[2] << 8) | tmp[3];
}
// x[i + 4] = x[i] ^ l1(byteSub(x[i + 1] ^ x[i + 2] ^ x[i + 3] ^ roundKey[i]))
for (let r = 0, mid; r < 32; r += 4) {
mid = x[1] ^ x[2] ^ x[3] ^ roundKey[r + 0];
x[0] ^= l1(byteSub(mid)); // x[4]
mid = x[2] ^ x[3] ^ x[0] ^ roundKey[r + 1];
x[1] ^= l1(byteSub(mid)); // x[5]
mid = x[3] ^ x[0] ^ x[1] ^ roundKey[r + 2];
x[2] ^= l1(byteSub(mid)); // x[6]
mid = x[0] ^ x[1] ^ x[2] ^ roundKey[r + 3];
x[3] ^= l1(byteSub(mid)); // x[7]
}
// 反序变换
for (let j = 0; j < 16; j += 4) {
output[j] = (x[3 - j / 4] >>> 24) & 0xff;
output[j + 1] = (x[3 - j / 4] >>> 16) & 0xff;
output[j + 2] = (x[3 - j / 4] >>> 8) & 0xff;
output[j + 3] = x[3 - j / 4] & 0xff;
}
}
/**
* 密钥扩展算法
*/
function sms4KeyExt(key, roundKey, cryptFlag) {
// 字节数组转成字数组（此处 1 字 = 32 比特）
for (let i = 0; i < 4; i++) {
tmp[0] = key[0 + 4 * i] & 0xff;
tmp[1] = key[1 + 4 * i] & 0xff;
tmp[2] = key[2 + 4 * i] & 0xff;
tmp[3] = key[3 + 4 * i] & 0xff;
x[i] = (tmp[0] << 24) | (tmp[1] << 16) | (tmp[2] << 8) | tmp[3];
}
// 与系统参数做异或
x[0] ^= 0xa3b1bac6;
x[1] ^= 0x56aa3350;
x[2] ^= 0x677d9197;
x[3] ^= 0xb27022dc;
// roundKey[i] = x[i + 4] = x[i] ^ l2(byteSub(x[i + 1] ^ x[i + 2] ^ x[i + 3] ^ CK[i]))
for (let r = 0, mid; r < 32; r += 4) {
mid = x[1] ^ x[2] ^ x[3] ^ CK[r + 0];
roundKey[r + 0] = x[0] ^= l2(byteSub(mid)); // x[4]
mid = x[2] ^ x[3] ^ x[0] ^ CK[r + 1];
roundKey[r + 1] = x[1] ^= l2(byteSub(mid)); // x[5]
mid = x[3] ^ x[0] ^ x[1] ^ CK[r + 2];
roundKey[r + 2] = x[2] ^= l2(byteSub(mid)); // x[6]
mid = x[0] ^ x[1] ^ x[2] ^ CK[r + 3];
roundKey[r + 3] = x[3] ^= l2(byteSub(mid)); // x[7]
}
// 解密时使用反序的轮密钥
if (cryptFlag === DECRYPT) {
for (let r = 0, mid; r < 16; r++) {
mid = roundKey[r];
roundKey[r] = roundKey[31 - r];
roundKey[31 - r] = mid;
}
}
}
const blockOutput = new Uint8Array(16);
export function sm4(inArray, key, cryptFlag, options = {}) {
let { padding = "pkcs#7", mode, iv = new Uint8Array(16), output } = options;
if (mode === "cbc") {
// CBC 模式，默认走 ECB 模式
if (typeof iv === "string")
iv = hexToArray(iv);
if (iv.length !== 128 / 8) {
// iv 不是 128 比特
throw new Error("iv is invalid");
}
}
// 检查 key
let tempKey = key;
if (typeof key === "string")
tempKey = hexToArray(key);
if (tempKey.length !== 128 / 8) {
// key 不是 128 比特
throw new Error("key is invalid");
}
// 检查输入
let tempInArray = inArray;
if (typeof inArray === "string") {
if (cryptFlag !== DECRYPT) {
// 加密，输入为 utf8 串
tempInArray = utf8ToArray(inArray);
}
else {
// 解密，输入为 16 进制串
tempInArray = hexToArray(inArray);
}
}
else {
tempInArray = Uint8Array.from(inArray);
}
// 新增填充，sm4 是 16 个字节一个分组，所以统一走到 pkcs#7
if ((padding === "pkcs#5" || padding === "pkcs#7") && cryptFlag !== DECRYPT) {
const paddingCount = BLOCK - (tempInArray.length % BLOCK);
const newArray = new Uint8Array(tempInArray.length + paddingCount);
newArray.set(tempInArray, 0);
for (let i = 0; i < paddingCount; i++)
newArray[tempInArray.length + i] = paddingCount;
tempInArray = newArray;
}
// 生成轮密钥
const roundKey = new Uint32Array(ROUND);
sms4KeyExt(tempKey, roundKey, cryptFlag);
let outArray = new Uint8Array(tempInArray.length);
let lastVector = iv;
let restLen = tempInArray.length;
let point = 0;
while (restLen >= BLOCK) {
const input = tempInArray.subarray(point, point + 16);
if (mode === "cbc") {
for (let i = 0; i < BLOCK; i++) {
if (cryptFlag !== DECRYPT) {
// 加密过程在组加密前进行异或
input[i] ^= lastVector[i];
}
}
}
sms4Crypt(input, blockOutput, roundKey);
for (let i = 0; i < BLOCK; i++) {
if (mode === "cbc") {
if (cryptFlag === DECRYPT) {
// 解密过程在组解密后进行异或
blockOutput[i] ^= lastVector[i];
}
}
outArray[point + i] = blockOutput[i];
}
if (mode === "cbc") {
if (cryptFlag !== DECRYPT) {
// 使用上一次输出作为加密向量
lastVector = blockOutput;
}
else {
// 使用上一次输入作为解密向量
lastVector = input;
}
}
restLen -= BLOCK;
point += BLOCK;
}
// 去除填充，sm4 是 16 个字节一个分组，所以统一走到 pkcs#7
if ((padding === "pkcs#5" || padding === "pkcs#7") && cryptFlag === DECRYPT) {
const len = outArray.length;
const paddingCount = outArray[len - 1];
for (let i = 1; i <= paddingCount; i++) {
if (outArray[len - i] !== paddingCount)
throw new Error("padding is invalid");
}
outArray = outArray.slice(0, len - paddingCount);
}
// 调整输出
if (output !== "array") {
if (cryptFlag !== DECRYPT) {
// 加密，输出转 16 进制串
return bytesToHex(outArray);
}
// 解密，输出转 utf8 串
return arrayToUtf8(outArray);
}
return outArray;
}
export function encrypt(inArray, key, options = {}) {
return sm4(inArray, key, 1, options);
}
export function decrypt(inArray, key, options = {}) {
return sm4(inArray, key, 0, options);
}
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