feat(sm4): optimize sm4

src/sm4/_slow.ts

@@ -0,0 +1,286 @@
+// Slower version of SM4, for audit purpose.
+// This version is 3-4x slower than the unwrapped version.
+
+import { bytesToHex } from '@/sm3/utils'
+import { rotl } from '../sm2/sm3'
+import { arrayToHex, arrayToUtf8, hexToArray } from '../sm2/utils'
+import { utf8ToArray } from '../sm3'
+
+/* 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: number) {
+  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: number) {
+  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: number) {
+  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: Uint8Array, output: Uint8Array, roundKey: Uint32Array) {
+  // 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: number; 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: Uint8Array, roundKey: Uint32Array, cryptFlag: 0 | 1) {
+
+  // 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: number; 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: number; r < 16; r++) {
+      mid = roundKey[r]
+      roundKey[r] = roundKey[31 - r]
+      roundKey[31 - r] = mid
+    }
+  }
+}
+export interface SM4Options {
+  padding?: 'pkcs#7' | 'pkcs#5' | 'none' | null
+  mode?: 'cbc' | 'ecb'
+  iv?: Uint8Array | string
+  output?: 'string' | 'array'
+}
+
+const blockOutput = new Uint8Array(16)
+export function sm4(inArray: Uint8Array | string, key: Uint8Array | string, cryptFlag: 0 | 1, options: SM4Options = {}) {
+  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
+  if (typeof key === 'string') key = hexToArray(key)
+  if (key.length !== (128 / 8)) {
+    // key 不是 128 比特
+    throw new Error('key is invalid')
+  }
+
+  // 检查输入
+  if (typeof inArray === 'string') {
+    if (cryptFlag !== DECRYPT) {
+      // 加密，输入为 utf8 串
+      inArray = utf8ToArray(inArray)
+    } else {
+      // 解密，输入为 16 进制串
+      inArray = hexToArray(inArray)
+    }
+  } else {
+    inArray = 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 - inArray.length % BLOCK
+    const newArray = new Uint8Array(inArray.length + paddingCount)
+    newArray.set(inArray, 0)
+    for (let i = 0; i < paddingCount; i++) newArray[inArray.length + i] = paddingCount
+    inArray = newArray
+  }
+
+  // 生成轮密钥
+  const roundKey = new Uint32Array(ROUND)
+  sms4KeyExt(key, roundKey, cryptFlag)
+
+  let outArray = new Uint8Array(inArray.length)
+  let lastVector = iv as Uint8Array
+  let restLen = inArray.length
+  let point = 0
+  while (restLen >= BLOCK) {
+    const input = inArray.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)
+    } else {
+      // 解密，输出转 utf8 串
+      return arrayToUtf8(outArray)
+    }
+  } else {
+    return outArray
+  }
+}
+
+export function encrypt(inArray: Uint8Array | string, key: Uint8Array | string, options?: { output: 'array' } | SM4Options): Uint8Array
+export function encrypt(inArray: Uint8Array | string, key: Uint8Array | string, options?: { output: 'string' } | SM4Options): string
+export function encrypt(inArray: Uint8Array | string, key: Uint8Array | string, options: SM4Options = {}) {
+  return sm4(inArray, key, 1, options)
+}
+
+export function decrypt(inArray: Uint8Array | string, key: Uint8Array | string, options?: { output: 'array' } | SM4Options): Uint8Array
+export function decrypt(inArray: Uint8Array | string, key: Uint8Array | string, options?: { output: 'string' } | SM4Options): string
+export function decrypt(inArray: Uint8Array | string, key: Uint8Array | string, options: SM4Options = {}) {
+  return sm4(inArray, key, 0, options)
+}