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use typed arrays for status of Rabbit instead of normal arrays

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MikeCAT 2022-10-29 03:33:30 +09:00
parent 3ac2ed20d2
commit d23b88e2b8
1 changed files with 27 additions and 27 deletions
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54
src/core/operations/RabbitStreamCipher.mjs
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@ -79,7 +79,7 @@ class RabbitStreamCipher extends Operation {
} }
// Inner State // Inner State
const X = [], C = []; const X = new Uint32Array(8), C = new Uint32Array(8);
let b = 0; let b = 0;
// Counter System // Counter System
@ -91,7 +91,7 @@ class RabbitStreamCipher extends Operation {
for (let j = 0; j < 8; j++) { for (let j = 0; j < 8; j++) {
const temp = C[j] + A[j] + b; const temp = C[j] + A[j] + b;
b = (temp / ((1 << 30) * 4)) >>> 0; b = (temp / ((1 << 30) * 4)) >>> 0;
C[j] = temp >>> 0; C[j] = temp;
} }
}; };
@ -106,18 +106,18 @@ class RabbitStreamCipher extends Operation {
const lswTemp = lowerLower + (upperLower2 & 0xffff) * (1 << 16); const lswTemp = lowerLower + (upperLower2 & 0xffff) * (1 << 16);
const msw = mswTemp + ((lswTemp / ((1 << 30) * 4)) >>> 0); const msw = mswTemp + ((lswTemp / ((1 << 30) * 4)) >>> 0);
const lsw = lswTemp >>> 0; const lsw = lswTemp >>> 0;
return (lsw ^ msw) >>> 0; return lsw ^ msw;
}; };
const leftRotate = function(value, width) { const leftRotate = function(value, width) {
return (value << width) | (value >>> (32 - width)); return (value << width) | (value >>> (32 - width));
}; };
const nextStateHelper1 = function(v0, v1, v2) { const nextStateHelper1 = function(v0, v1, v2) {
return (v0 + leftRotate(v1, 16) + leftRotate(v2, 16)) >>> 0; return v0 + leftRotate(v1, 16) + leftRotate(v2, 16);
}; };
const nextStateHelper2 = function(v0, v1, v2) { const nextStateHelper2 = function(v0, v1, v2) {
return (v0 + leftRotate(v1, 8) + v2) >>> 0; return v0 + leftRotate(v1, 8) + v2;
}; };
const G = new Array(8); const G = new Uint32Array(8);
const nextState = function() { const nextState = function() {
for (let j = 0; j < 8; j++) { for (let j = 0; j < 8; j++) {
G[j] = g(X[j], C[j]); G[j] = g(X[j], C[j]);
@ -133,23 +133,23 @@ class RabbitStreamCipher extends Operation {
}; };
// Key Setup Scheme // Key Setup Scheme
const K = []; const K = new Uint16Array(8);
if (littleEndian) { if (littleEndian) {
for (let i = 0; i < 8; i++) { for (let i = 0; i < 8; i++) {
K.push((key[1 + 2 * i] << 8) | key[2 * i]); K[i] = (key[1 + 2 * i] << 8) | key[2 * i];
} }
} else { } else {
for (let i = 0; i < 8; i++) { for (let i = 0; i < 8; i++) {
K.push((key[14 - 2 * i] << 8) | key[15 - 2 * i]); K[i] = (key[14 - 2 * i] << 8) | key[15 - 2 * i];
} }
} }
for (let j = 0; j < 8; j++) { for (let j = 0; j < 8; j++) {
if (j % 2 === 0) { if (j % 2 === 0) {
X.push(((K[(j + 1) % 8] << 16) | K[j]) >>> 0); X[j] = (K[(j + 1) % 8] << 16) | K[j];
C.push(((K[(j + 4) % 8] << 16) | K[(j + 5) % 8]) >>> 0); C[j] = (K[(j + 4) % 8] << 16) | K[(j + 5) % 8];
} else { } else {
X.push(((K[(j + 5) % 8] << 16) | K[(j + 4) % 8]) >>> 0); X[j] = (K[(j + 5) % 8] << 16) | K[(j + 4) % 8];
C.push(((K[j] << 16) | K[(j + 1) % 8]) >>> 0); C[j] = (K[j] << 16) | K[(j + 1) % 8];
} }
} }
for (let i = 0; i < 4; i++) { for (let i = 0; i < 4; i++) {
@ -157,28 +157,28 @@ class RabbitStreamCipher extends Operation {
nextState(); nextState();
} }
for (let j = 0; j < 8; j++) { for (let j = 0; j < 8; j++) {
C[j] = (C[j] ^ X[(j + 4) % 8]) >>> 0; C[j] = C[j] ^ X[(j + 4) % 8];
} }
// IV Setup Scheme // IV Setup Scheme
if (iv.length === 8) { if (iv.length === 8) {
const getIVValue = function(a, b, c, d) { const getIVValue = function(a, b, c, d) {
if (littleEndian) { if (littleEndian) {
return ((iv[a] << 24) | (iv[b] << 16) | return (iv[a] << 24) | (iv[b] << 16) |
(iv[c] << 8) | iv[d]) >>> 0; (iv[c] << 8) | iv[d];
} else { } else {
return ((iv[7 - a] << 24) | (iv[7 - b] << 16) | return (iv[7 - a] << 24) | (iv[7 - b] << 16) |
(iv[7 - c] << 8) | iv[7 - d]) >>> 0; (iv[7 - c] << 8) | iv[7 - d];
} }
}; };
C[0] = (C[0] ^ getIVValue(3, 2, 1, 0)) >>> 0; C[0] = C[0] ^ getIVValue(3, 2, 1, 0);
C[1] = (C[1] ^ getIVValue(7, 6, 3, 2)) >>> 0; C[1] = C[1] ^ getIVValue(7, 6, 3, 2);
C[2] = (C[2] ^ getIVValue(7, 6, 5, 4)) >>> 0; C[2] = C[2] ^ getIVValue(7, 6, 5, 4);
C[3] = (C[3] ^ getIVValue(5, 4, 1, 0)) >>> 0; C[3] = C[3] ^ getIVValue(5, 4, 1, 0);
C[4] = (C[4] ^ getIVValue(3, 2, 1, 0)) >>> 0; C[4] = C[4] ^ getIVValue(3, 2, 1, 0);
C[5] = (C[5] ^ getIVValue(7, 6, 3, 2)) >>> 0; C[5] = C[5] ^ getIVValue(7, 6, 3, 2);
C[6] = (C[6] ^ getIVValue(7, 6, 5, 4)) >>> 0; C[6] = C[6] ^ getIVValue(7, 6, 5, 4);
C[7] = (C[7] ^ getIVValue(5, 4, 1, 0)) >>> 0; C[7] = C[7] ^ getIVValue(5, 4, 1, 0);
for (let i = 0; i < 4; i++) { for (let i = 0; i < 4; i++) {
counterUpdate(); counterUpdate();
nextState(); nextState();
@ -186,7 +186,7 @@ class RabbitStreamCipher extends Operation {
} }
// Extraction Scheme // Extraction Scheme
const S = new Array(16); const S = new Uint8Array(16);
const extract = function() { const extract = function() {
let pos = 0; let pos = 0;
const addPart = function(value) { const addPart = function(value) {