mirror of
https://github.com/YunoHost-Apps/movim_ynh.git
synced 2024-09-03 19:46:19 +02:00
254 lines
9.8 KiB
JavaScript
254 lines
9.8 KiB
JavaScript
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// Salsa20 implementation
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// Contributed to Cryptocat by Dmitry Chestnykh
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// 21-01-2013
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;(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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define(factory)
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} else if (typeof module !== 'undefined' && module.exports) {
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module.exports = factory()
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} else {
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root.Salsa20 = factory()
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}
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}(this, function () {
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function Salsa20(key, nonce) {
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// Constants.
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this.rounds = 20; // number of Salsa rounds
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this.sigmaWords = [0x61707865, 0x3320646e, 0x79622d32, 0x6b206574];
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// State.
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this.keyWords = []; // key words
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this.nonceWords = [0, 0]; // nonce words
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this.counterWords = [0, 0]; // block counter words
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// Output buffer.
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this.block = []; // output block of 64 bytes
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this.blockUsed = 64; // number of block bytes used
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this.setKey(key);
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this.setNonce(nonce);
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}
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// setKey sets the key to the given 32-byte array.
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Salsa20.prototype.setKey = function(key) {
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for (var i = 0, j = 0; i < 8; i++, j += 4) {
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this.keyWords[i] = (key[j] & 0xff) |
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((key[j+1] & 0xff)<<8) |
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((key[j+2] & 0xff)<<16) |
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((key[j+3] & 0xff)<<24);
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}
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this._reset();
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};
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// setNonce sets the nonce to the given 8-byte array.
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Salsa20.prototype.setNonce = function(nonce) {
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this.nonceWords[0] = (nonce[0] & 0xff) |
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((nonce[1] & 0xff)<<8) |
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((nonce[2] & 0xff)<<16) |
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((nonce[3] & 0xff)<<24);
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this.nonceWords[1] = (nonce[4] & 0xff) |
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((nonce[5] & 0xff)<<8) |
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((nonce[6] & 0xff)<<16) |
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((nonce[7] & 0xff)<<24);
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this._reset();
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};
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// getBytes returns the next numberOfBytes bytes of stream.
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Salsa20.prototype.getBytes = function(numberOfBytes) {
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var out = new Array(numberOfBytes);
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for (var i = 0; i < numberOfBytes; i++) {
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if (this.blockUsed == 64) {
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this._generateBlock();
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this._incrementCounter();
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this.blockUsed = 0;
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}
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out[i] = this.block[this.blockUsed];
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this.blockUsed++;
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}
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return out;
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};
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Salsa20.prototype.getHexString = function(numberOfBytes) {
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var hex=['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'];
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var out = [];
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var bytes = this.getBytes(numberOfBytes);
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for(var i = 0; i < bytes.length; i++) {
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out.push(hex[(bytes[i] >> 4) & 15]);
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out.push(hex[bytes[i] & 15]);
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}
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return out.join('');
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};
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// Private methods.
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Salsa20.prototype._reset = function() {
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this.counterWords[0] = 0;
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this.counterWords[1] = 0;
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this.blockUsed = 64;
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};
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// _incrementCounter increments block counter.
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Salsa20.prototype._incrementCounter = function() {
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// Note: maximum 2^64 blocks.
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this.counterWords[0] = (this.counterWords[0] + 1) & 0xffffffff;
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if (this.counterWords[0] == 0) {
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this.counterWords[1] = (this.counterWords[1] + 1) & 0xffffffff;
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}
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};
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// _generateBlock generates 64 bytes from key, nonce, and counter,
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// and puts the result into this.block.
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Salsa20.prototype._generateBlock = function() {
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var j0 = this.sigmaWords[0],
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j1 = this.keyWords[0],
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j2 = this.keyWords[1],
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j3 = this.keyWords[2],
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j4 = this.keyWords[3],
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j5 = this.sigmaWords[1],
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j6 = this.nonceWords[0],
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j7 = this.nonceWords[1],
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j8 = this.counterWords[0],
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j9 = this.counterWords[1],
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j10 = this.sigmaWords[2],
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j11 = this.keyWords[4],
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j12 = this.keyWords[5],
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j13 = this.keyWords[6],
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j14 = this.keyWords[7],
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j15 = this.sigmaWords[3];
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var x0 = j0, x1 = j1, x2 = j2, x3 = j3, x4 = j4, x5 = j5, x6 = j6, x7 = j7,
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x8 = j8, x9 = j9, x10 = j10, x11 = j11, x12 = j12, x13 = j13, x14 = j14, x15 = j15;
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var u;
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for (var i = 0; i < this.rounds; i += 2) {
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u = x0 + x12;
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x4 ^= (u<<7) | (u>>>(32-7));
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u = x4 + x0;
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x8 ^= (u<<9) | (u>>>(32-9));
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u = x8 + x4;
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x12 ^= (u<<13) | (u>>>(32-13));
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u = x12 + x8;
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x0 ^= (u<<18) | (u>>>(32-18));
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u = x5 + x1;
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x9 ^= (u<<7) | (u>>>(32-7));
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u = x9 + x5;
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x13 ^= (u<<9) | (u>>>(32-9));
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u = x13 + x9;
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x1 ^= (u<<13) | (u>>>(32-13));
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u = x1 + x13;
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x5 ^= (u<<18) | (u>>>(32-18));
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u = x10 + x6;
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x14 ^= (u<<7) | (u>>>(32-7));
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u = x14 + x10;
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x2 ^= (u<<9) | (u>>>(32-9));
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u = x2 + x14;
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x6 ^= (u<<13) | (u>>>(32-13));
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u = x6 + x2;
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x10 ^= (u<<18) | (u>>>(32-18));
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u = x15 + x11;
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x3 ^= (u<<7) | (u>>>(32-7));
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u = x3 + x15;
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x7 ^= (u<<9) | (u>>>(32-9));
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u = x7 + x3;
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x11 ^= (u<<13) | (u>>>(32-13));
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u = x11 + x7;
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x15 ^= (u<<18) | (u>>>(32-18));
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u = x0 + x3;
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x1 ^= (u<<7) | (u>>>(32-7));
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u = x1 + x0;
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x2 ^= (u<<9) | (u>>>(32-9));
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u = x2 + x1;
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x3 ^= (u<<13) | (u>>>(32-13));
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u = x3 + x2;
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x0 ^= (u<<18) | (u>>>(32-18));
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u = x5 + x4;
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x6 ^= (u<<7) | (u>>>(32-7));
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u = x6 + x5;
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x7 ^= (u<<9) | (u>>>(32-9));
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u = x7 + x6;
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x4 ^= (u<<13) | (u>>>(32-13));
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u = x4 + x7;
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x5 ^= (u<<18) | (u>>>(32-18));
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u = x10 + x9;
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x11 ^= (u<<7) | (u>>>(32-7));
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u = x11 + x10;
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x8 ^= (u<<9) | (u>>>(32-9));
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u = x8 + x11;
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x9 ^= (u<<13) | (u>>>(32-13));
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u = x9 + x8;
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x10 ^= (u<<18) | (u>>>(32-18));
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u = x15 + x14;
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x12 ^= (u<<7) | (u>>>(32-7));
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u = x12 + x15;
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x13 ^= (u<<9) | (u>>>(32-9));
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u = x13 + x12;
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x14 ^= (u<<13) | (u>>>(32-13));
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u = x14 + x13;
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x15 ^= (u<<18) | (u>>>(32-18));
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}
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x0 += j0;
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x1 += j1;
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x2 += j2;
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x3 += j3;
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x4 += j4;
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x5 += j5;
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x6 += j6;
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x7 += j7;
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x8 += j8;
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x9 += j9;
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x10 += j10;
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x11 += j11;
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x12 += j12;
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x13 += j13;
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x14 += j14;
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x15 += j15;
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this.block[ 0] = ( x0 >>> 0) & 0xff; this.block[ 1] = ( x0 >>> 8) & 0xff;
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this.block[ 2] = ( x0 >>> 16) & 0xff; this.block[ 3] = ( x0 >>> 24) & 0xff;
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this.block[ 4] = ( x1 >>> 0) & 0xff; this.block[ 5] = ( x1 >>> 8) & 0xff;
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this.block[ 6] = ( x1 >>> 16) & 0xff; this.block[ 7] = ( x1 >>> 24) & 0xff;
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this.block[ 8] = ( x2 >>> 0) & 0xff; this.block[ 9] = ( x2 >>> 8) & 0xff;
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this.block[10] = ( x2 >>> 16) & 0xff; this.block[11] = ( x2 >>> 24) & 0xff;
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this.block[12] = ( x3 >>> 0) & 0xff; this.block[13] = ( x3 >>> 8) & 0xff;
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this.block[14] = ( x3 >>> 16) & 0xff; this.block[15] = ( x3 >>> 24) & 0xff;
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this.block[16] = ( x4 >>> 0) & 0xff; this.block[17] = ( x4 >>> 8) & 0xff;
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this.block[18] = ( x4 >>> 16) & 0xff; this.block[19] = ( x4 >>> 24) & 0xff;
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this.block[20] = ( x5 >>> 0) & 0xff; this.block[21] = ( x5 >>> 8) & 0xff;
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this.block[22] = ( x5 >>> 16) & 0xff; this.block[23] = ( x5 >>> 24) & 0xff;
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this.block[24] = ( x6 >>> 0) & 0xff; this.block[25] = ( x6 >>> 8) & 0xff;
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this.block[26] = ( x6 >>> 16) & 0xff; this.block[27] = ( x6 >>> 24) & 0xff;
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this.block[28] = ( x7 >>> 0) & 0xff; this.block[29] = ( x7 >>> 8) & 0xff;
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this.block[30] = ( x7 >>> 16) & 0xff; this.block[31] = ( x7 >>> 24) & 0xff;
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this.block[32] = ( x8 >>> 0) & 0xff; this.block[33] = ( x8 >>> 8) & 0xff;
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this.block[34] = ( x8 >>> 16) & 0xff; this.block[35] = ( x8 >>> 24) & 0xff;
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this.block[36] = ( x9 >>> 0) & 0xff; this.block[37] = ( x9 >>> 8) & 0xff;
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this.block[38] = ( x9 >>> 16) & 0xff; this.block[39] = ( x9 >>> 24) & 0xff;
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this.block[40] = (x10 >>> 0) & 0xff; this.block[41] = (x10 >>> 8) & 0xff;
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this.block[42] = (x10 >>> 16) & 0xff; this.block[43] = (x10 >>> 24) & 0xff;
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this.block[44] = (x11 >>> 0) & 0xff; this.block[45] = (x11 >>> 8) & 0xff;
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this.block[46] = (x11 >>> 16) & 0xff; this.block[47] = (x11 >>> 24) & 0xff;
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this.block[48] = (x12 >>> 0) & 0xff; this.block[49] = (x12 >>> 8) & 0xff;
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this.block[50] = (x12 >>> 16) & 0xff; this.block[51] = (x12 >>> 24) & 0xff;
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this.block[52] = (x13 >>> 0) & 0xff; this.block[53] = (x13 >>> 8) & 0xff;
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this.block[54] = (x13 >>> 16) & 0xff; this.block[55] = (x13 >>> 24) & 0xff;
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this.block[56] = (x14 >>> 0) & 0xff; this.block[57] = (x14 >>> 8) & 0xff;
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this.block[58] = (x14 >>> 16) & 0xff; this.block[59] = (x14 >>> 24) & 0xff;
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this.block[60] = (x15 >>> 0) & 0xff; this.block[61] = (x15 >>> 8) & 0xff;
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this.block[62] = (x15 >>> 16) & 0xff; this.block[63] = (x15 >>> 24) & 0xff;
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};
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return Salsa20
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}))
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