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Просмотр файла: _blake2.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BLAKE2 = exports.SIGMA = void 0;
const _assert_js_1 = require("./_assert.js");
const utils_js_1 = require("./utils.js");
// prettier-ignore
exports.SIGMA = new Uint8Array([
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3,
11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4,
7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8,
9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13,
2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9,
12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11,
13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10,
6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5,
10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0,
// For BLAKE2b, the two extra permutations for rounds 10 and 11 are SIGMA[10..11] = SIGMA[0..1].
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3,
]);
class BLAKE2 extends utils_js_1.Hash {
constructor(blockLen, outputLen, opts = {}, keyLen, saltLen, persLen) {
super();
this.blockLen = blockLen;
this.outputLen = outputLen;
this.length = 0;
this.pos = 0;
this.finished = false;
this.destroyed = false;
_assert_js_1.default.number(blockLen);
_assert_js_1.default.number(outputLen);
_assert_js_1.default.number(keyLen);
if (outputLen < 0 || outputLen > keyLen)
throw new Error('Blake2: outputLen bigger than keyLen');
if (opts.key !== undefined && (opts.key.length < 1 || opts.key.length > keyLen))
throw new Error(`Key should be up 1..${keyLen} byte long or undefined`);
if (opts.salt !== undefined && opts.salt.length !== saltLen)
throw new Error(`Salt should be ${saltLen} byte long or undefined`);
if (opts.personalization !== undefined && opts.personalization.length !== persLen)
throw new Error(`Personalization should be ${persLen} byte long or undefined`);
this.buffer32 = (0, utils_js_1.u32)((this.buffer = new Uint8Array(blockLen)));
}
update(data) {
_assert_js_1.default.exists(this);
// Main difference with other hashes: there is flag for last block,
// so we cannot process current block before we know that there
// is the next one. This significantly complicates logic and reduces ability
// to do zero-copy processing
const { blockLen, buffer, buffer32 } = this;
data = (0, utils_js_1.toBytes)(data);
const len = data.length;
for (let pos = 0; pos < len;) {
// If buffer is full and we still have input (don't process last block, same as blake2s)
if (this.pos === blockLen) {
this.compress(buffer32, 0, false);
this.pos = 0;
}
const take = Math.min(blockLen - this.pos, len - pos);
const dataOffset = data.byteOffset + pos;
// full block && aligned to 4 bytes && not last in input
if (take === blockLen && !(dataOffset % 4) && pos + take < len) {
const data32 = new Uint32Array(data.buffer, dataOffset, Math.floor((len - pos) / 4));
for (let pos32 = 0; pos + blockLen < len; pos32 += buffer32.length, pos += blockLen) {
this.length += blockLen;
this.compress(data32, pos32, false);
}
continue;
}
buffer.set(data.subarray(pos, pos + take), this.pos);
this.pos += take;
this.length += take;
pos += take;
}
return this;
}
digestInto(out) {
_assert_js_1.default.exists(this);
_assert_js_1.default.output(out, this);
const { pos, buffer32 } = this;
this.finished = true;
// Padding
this.buffer.subarray(pos).fill(0);
this.compress(buffer32, 0, true);
const out32 = (0, utils_js_1.u32)(out);
this.get().forEach((v, i) => (out32[i] = v));
}
digest() {
const { buffer, outputLen } = this;
this.digestInto(buffer);
const res = buffer.slice(0, outputLen);
this.destroy();
return res;
}
_cloneInto(to) {
const { buffer, length, finished, destroyed, outputLen, pos } = this;
to || (to = new this.constructor({ dkLen: outputLen }));
to.set(...this.get());
to.length = length;
to.finished = finished;
to.destroyed = destroyed;
to.outputLen = outputLen;
to.buffer.set(buffer);
to.pos = pos;
return to;
}
}
exports.BLAKE2 = BLAKE2;
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