1200 lines
17 KiB
JavaScript
1200 lines
17 KiB
JavaScript
import { BlockCipher } from "./cipher-core.mjs";
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//#region src/blowfish.ts
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const N = 16;
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const ORIG_P = [
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];
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const ORIG_S = [
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985887462
|
|
]
|
|
];
|
|
const blowfishCtx = {
|
|
pbox: [],
|
|
sbox: []
|
|
};
|
|
function f(ctx, x) {
|
|
const a = x >> 24 & 255;
|
|
const b = x >> 16 & 255;
|
|
const c = x >> 8 & 255;
|
|
const d = x & 255;
|
|
let y = ctx.sbox[0][a] + ctx.sbox[1][b];
|
|
y = y ^ ctx.sbox[2][c];
|
|
y = y + ctx.sbox[3][d];
|
|
return y;
|
|
}
|
|
function blowfishEncrypt(ctx, left, right) {
|
|
let Xl = left;
|
|
let Xr = right;
|
|
let temp;
|
|
for (let i = 0; i < N; ++i) {
|
|
Xl = Xl ^ ctx.pbox[i];
|
|
Xr = f(ctx, Xl) ^ Xr;
|
|
temp = Xl;
|
|
Xl = Xr;
|
|
Xr = temp;
|
|
}
|
|
temp = Xl;
|
|
Xl = Xr;
|
|
Xr = temp;
|
|
Xr = Xr ^ ctx.pbox[N];
|
|
Xl = Xl ^ ctx.pbox[N + 1];
|
|
return {
|
|
left: Xl,
|
|
right: Xr
|
|
};
|
|
}
|
|
function blowfishDecrypt(ctx, left, right) {
|
|
let Xl = left;
|
|
let Xr = right;
|
|
let temp;
|
|
for (let i = N + 1; i > 1; --i) {
|
|
Xl = Xl ^ ctx.pbox[i];
|
|
Xr = f(ctx, Xl) ^ Xr;
|
|
temp = Xl;
|
|
Xl = Xr;
|
|
Xr = temp;
|
|
}
|
|
temp = Xl;
|
|
Xl = Xr;
|
|
Xr = temp;
|
|
Xr = Xr ^ ctx.pbox[1];
|
|
Xl = Xl ^ ctx.pbox[0];
|
|
return {
|
|
left: Xl,
|
|
right: Xr
|
|
};
|
|
}
|
|
/**
|
|
* Initialization ctx's pbox and sbox.
|
|
*
|
|
* @param {Object} ctx The object has pbox and sbox.
|
|
* @param {Array} key An array of 32-bit words.
|
|
* @param {int} keysize The length of the key.
|
|
*
|
|
* @example
|
|
*
|
|
* blowfishInit(BLOWFISH_CTX, key, 128/32);
|
|
*/
|
|
function blowfishInit(ctx, key, keysize) {
|
|
for (let Row = 0; Row < 4; Row++) {
|
|
ctx.sbox[Row] = [];
|
|
for (let Col = 0; Col < 256; Col++) ctx.sbox[Row][Col] = ORIG_S[Row][Col];
|
|
}
|
|
let keyIndex = 0;
|
|
for (let index = 0; index < N + 2; index++) {
|
|
ctx.pbox[index] = ORIG_P[index] ^ key[keyIndex];
|
|
keyIndex++;
|
|
if (keyIndex >= keysize) keyIndex = 0;
|
|
}
|
|
let data1 = 0;
|
|
let data2 = 0;
|
|
let res = {
|
|
left: 0,
|
|
right: 0
|
|
};
|
|
for (let i = 0; i < N + 2; i += 2) {
|
|
res = blowfishEncrypt(ctx, data1, data2);
|
|
data1 = res.left;
|
|
data2 = res.right;
|
|
ctx.pbox[i] = data1;
|
|
ctx.pbox[i + 1] = data2;
|
|
}
|
|
for (let i = 0; i < 4; i++) for (let j = 0; j < 256; j += 2) {
|
|
res = blowfishEncrypt(ctx, data1, data2);
|
|
data1 = res.left;
|
|
data2 = res.right;
|
|
ctx.sbox[i][j] = data1;
|
|
ctx.sbox[i][j + 1] = data2;
|
|
}
|
|
return true;
|
|
}
|
|
/**
|
|
* Blowfish block cipher algorithm.
|
|
*/
|
|
var BlowfishAlgo = class extends BlockCipher {
|
|
static keySize = 128 / 32;
|
|
static ivSize = 64 / 32;
|
|
_keyPriorReset;
|
|
constructor(xformMode, key, cfg) {
|
|
super(xformMode, key, cfg);
|
|
this.blockSize = 64 / 32;
|
|
}
|
|
_doReset() {
|
|
if (this._keyPriorReset === this._key) return;
|
|
const key = this._keyPriorReset = this._key;
|
|
const keyWords = key.words;
|
|
const keySize = key.sigBytes / 4;
|
|
blowfishInit(blowfishCtx, keyWords, keySize);
|
|
}
|
|
encryptBlock(M, offset) {
|
|
const res = blowfishEncrypt(blowfishCtx, M[offset], M[offset + 1]);
|
|
M[offset] = res.left;
|
|
M[offset + 1] = res.right;
|
|
}
|
|
decryptBlock(M, offset) {
|
|
const res = blowfishDecrypt(blowfishCtx, M[offset], M[offset + 1]);
|
|
M[offset] = res.left;
|
|
M[offset + 1] = res.right;
|
|
}
|
|
};
|
|
/**
|
|
* Shortcut functions to the cipher's object interface.
|
|
*
|
|
* @example
|
|
*
|
|
* var ciphertext = Blowfish.encrypt(message, key, cfg);
|
|
* var plaintext = Blowfish.decrypt(ciphertext, key, cfg);
|
|
*/
|
|
const Blowfish = BlockCipher._createHelper(BlowfishAlgo);
|
|
|
|
//#endregion
|
|
export { Blowfish, BlowfishAlgo };
|
|
//# sourceMappingURL=blowfish.mjs.map
|