feat: use static cipher instead of mask
(cherry picked from commit cd6b84ad7eed489f9bcbd72d847cd4d704052b0c)remotes/origin/HEAD
MengYX
3 years ago
parent
cd3f4d8c22
commit
b4068e2edb
@ -1,98 +0,0 @@
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const QMCDefaultMaskMatrix = [
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0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
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0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
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0x47, 0x95, 0xbb, 0xa1, 0xaa, 0xc6, 0x66, 0x23,
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0x92, 0x62, 0xf3, 0x74, 0xa1, 0x9f, 0xf4, 0xa0,
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0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
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0xf9, 0xbc, 0x00, 0x11];
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const AllMapping: number[][] = [];
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const Mask128to44: number[] = [];
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(function () {
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for (let i = 0; i < 128; i++) {
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let realIdx = (i * i + 27) % 256
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if (realIdx in AllMapping) {
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AllMapping[realIdx].push(i)
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} else {
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AllMapping[realIdx] = [i]
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}
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}
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let idx44 = 0
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AllMapping.forEach(all128 => {
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all128.forEach(_i128 => {
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Mask128to44[_i128] = idx44
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})
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idx44++
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})
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})();
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export class QmcMask {
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private readonly Matrix128: number[];
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constructor(matrix: number[] | Uint8Array) {
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if (matrix instanceof Uint8Array) matrix = Array.from(matrix)
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if (matrix.length === 44) {
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this.Matrix128 = this._generate128(matrix)
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} else if (matrix.length === 128) {
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this.Matrix128 = matrix
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} else {
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throw Error("invalid mask length")
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}
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}
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getMatrix128() {
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return this.Matrix128
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}
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getMatrix44(): number[] {
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const matrix44: number[] = []
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let idxI44 = 0
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AllMapping.forEach(it256 => {
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let it256Len = it256.length
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for (let i = 1; i < it256Len; i++) {
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if (this.Matrix128[it256[0]] !== this.Matrix128[it256[i]]) {
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throw "decode mask-128 to mask-44 failed"
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}
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}
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matrix44[idxI44] = this.Matrix128[it256[0]]
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idxI44++
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})
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return matrix44
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}
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Decrypt(data: Uint8Array) {
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if (!this.Matrix128) throw Error("bad call sequence")
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let dst = data.slice(0);
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let index = -1;
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let maskIdx = -1;
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for (let cur = 0; cur < data.length; cur++) {
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index++;
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maskIdx++;
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if (index === 0x8000 || (index > 0x8000 && (index + 1) % 0x8000 === 0)) {
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index++;
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maskIdx++;
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}
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if (maskIdx >= 128) maskIdx -= 128;
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dst[cur] ^= this.Matrix128[maskIdx];
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}
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return dst;
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}
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private _generate128(matrix44: number[]): number[] {
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const matrix128: number[] = []
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let idx44 = 0
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AllMapping.forEach(it256 => {
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it256.forEach(m => {
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matrix128[m] = matrix44[idx44]
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})
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idx44++
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})
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return matrix128
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}
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}
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export function QmcMaskGetDefault() {
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return new QmcMask(QMCDefaultMaskMatrix)
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}
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@ -0,0 +1,27 @@
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import {QmcStaticCipher} from "@/decrypt/qmc_cipher";
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test("static cipher [0x7ff8,0x8000) ", () => {
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const expected = new Uint8Array([
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0xD8, 0x52, 0xF7, 0x67, 0x90, 0xCA, 0xD6, 0x4A,
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0x4A, 0xD6, 0xCA, 0x90, 0x67, 0xF7, 0x52, 0xD8,
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])
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const c = new QmcStaticCipher()
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const buf = new Uint8Array(16)
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c.decrypt(buf, 0x7ff8)
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expect(buf).toStrictEqual(expected)
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})
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test("static cipher [0,0x10) ", () => {
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const expected = new Uint8Array([
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0xC3, 0x4A, 0xD6, 0xCA, 0x90, 0x67, 0xF7, 0x52,
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0xD8, 0xA1, 0x66, 0x62, 0x9F, 0x5B, 0x09, 0x00,
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])
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const c = new QmcStaticCipher()
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const buf = new Uint8Array(16)
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c.decrypt(buf, 0)
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expect(buf).toStrictEqual(expected)
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})
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@ -0,0 +1,53 @@
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const staticCipherBox = new Uint8Array([
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0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, //0x00
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0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0, //0x08
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0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //0x10
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0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, //0x18
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0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, //0x20
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0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //0x28
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0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, //0x30
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0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, //0x38
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0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //0x40
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0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, //0x48
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0x68, 0xA6, 0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, //0x50
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0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //0x58
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0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, //0x60
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0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, //0x68
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0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //0x70
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0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, //0x78
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0x34, 0x9F, 0xCF, 0x18, 0x23, 0xA0, 0x0A, 0x74, //0x80
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0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //0x88
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0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, //0x90
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0x08, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, //0x98
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0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //0xA0
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0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, //0xA8
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0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40, 0xE8, //0xB0
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0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //0xB8
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0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, //0xC0
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0xFB, 0xEF, 0x0E, 0x37, 0xF0, 0x0E, 0xCD, 0x16, //0xC8
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0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //0xD0
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0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, //0xD8
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0x06, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, //0xE0
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0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //0xE8
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0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, //0xF0
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0xA5, 0x47, 0xF7, 0xF6, 0x00, 0x79, 0x4A, 0x11, //0xF8
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])
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interface streamCipher {
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decrypt(buf: Uint8Array, offset: number): void
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}
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export class QmcStaticCipher implements streamCipher {
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public getMask(offset: number) {
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if (offset > 0x7FFF) offset %= 0x7FFF
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return staticCipherBox[(offset * offset + 27) & 0xff]
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}
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public decrypt(buf: Uint8Array, offset: number) {
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for (let i = 0; i < buf.length; i++) {
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buf[i] ^= this.getMask(offset + i)
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}
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}
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}
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