124 lines
5.0 KiB
JavaScript
124 lines
5.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.RawSha256 = void 0;
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var constants_1 = require("./constants");
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/**
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* @internal
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*/
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var RawSha256 = /** @class */ (function () {
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function RawSha256() {
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this.state = Int32Array.from(constants_1.INIT);
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this.temp = new Int32Array(64);
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this.buffer = new Uint8Array(64);
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this.bufferLength = 0;
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this.bytesHashed = 0;
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/**
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* @internal
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*/
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this.finished = false;
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}
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RawSha256.prototype.update = function (data) {
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if (this.finished) {
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throw new Error("Attempted to update an already finished hash.");
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}
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var position = 0;
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var byteLength = data.byteLength;
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this.bytesHashed += byteLength;
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if (this.bytesHashed * 8 > constants_1.MAX_HASHABLE_LENGTH) {
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throw new Error("Cannot hash more than 2^53 - 1 bits");
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}
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while (byteLength > 0) {
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this.buffer[this.bufferLength++] = data[position++];
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byteLength--;
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if (this.bufferLength === constants_1.BLOCK_SIZE) {
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this.hashBuffer();
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this.bufferLength = 0;
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}
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}
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};
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RawSha256.prototype.digest = function () {
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if (!this.finished) {
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var bitsHashed = this.bytesHashed * 8;
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var bufferView = new DataView(this.buffer.buffer, this.buffer.byteOffset, this.buffer.byteLength);
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var undecoratedLength = this.bufferLength;
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bufferView.setUint8(this.bufferLength++, 0x80);
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// Ensure the final block has enough room for the hashed length
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if (undecoratedLength % constants_1.BLOCK_SIZE >= constants_1.BLOCK_SIZE - 8) {
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for (var i = this.bufferLength; i < constants_1.BLOCK_SIZE; i++) {
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bufferView.setUint8(i, 0);
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}
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this.hashBuffer();
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this.bufferLength = 0;
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}
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for (var i = this.bufferLength; i < constants_1.BLOCK_SIZE - 8; i++) {
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bufferView.setUint8(i, 0);
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}
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bufferView.setUint32(constants_1.BLOCK_SIZE - 8, Math.floor(bitsHashed / 0x100000000), true);
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bufferView.setUint32(constants_1.BLOCK_SIZE - 4, bitsHashed);
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this.hashBuffer();
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this.finished = true;
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}
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// The value in state is little-endian rather than big-endian, so flip
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// each word into a new Uint8Array
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var out = new Uint8Array(constants_1.DIGEST_LENGTH);
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for (var i = 0; i < 8; i++) {
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out[i * 4] = (this.state[i] >>> 24) & 0xff;
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out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff;
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out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff;
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out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff;
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}
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return out;
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};
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RawSha256.prototype.hashBuffer = function () {
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var _a = this, buffer = _a.buffer, state = _a.state;
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var state0 = state[0], state1 = state[1], state2 = state[2], state3 = state[3], state4 = state[4], state5 = state[5], state6 = state[6], state7 = state[7];
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for (var i = 0; i < constants_1.BLOCK_SIZE; i++) {
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if (i < 16) {
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this.temp[i] =
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((buffer[i * 4] & 0xff) << 24) |
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((buffer[i * 4 + 1] & 0xff) << 16) |
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((buffer[i * 4 + 2] & 0xff) << 8) |
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(buffer[i * 4 + 3] & 0xff);
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}
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else {
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var u = this.temp[i - 2];
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var t1_1 = ((u >>> 17) | (u << 15)) ^ ((u >>> 19) | (u << 13)) ^ (u >>> 10);
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u = this.temp[i - 15];
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var t2_1 = ((u >>> 7) | (u << 25)) ^ ((u >>> 18) | (u << 14)) ^ (u >>> 3);
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this.temp[i] =
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((t1_1 + this.temp[i - 7]) | 0) + ((t2_1 + this.temp[i - 16]) | 0);
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}
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var t1 = ((((((state4 >>> 6) | (state4 << 26)) ^
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((state4 >>> 11) | (state4 << 21)) ^
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((state4 >>> 25) | (state4 << 7))) +
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((state4 & state5) ^ (~state4 & state6))) |
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0) +
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((state7 + ((constants_1.KEY[i] + this.temp[i]) | 0)) | 0)) |
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0;
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var t2 = ((((state0 >>> 2) | (state0 << 30)) ^
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((state0 >>> 13) | (state0 << 19)) ^
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((state0 >>> 22) | (state0 << 10))) +
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((state0 & state1) ^ (state0 & state2) ^ (state1 & state2))) |
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0;
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state7 = state6;
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state6 = state5;
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state5 = state4;
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state4 = (state3 + t1) | 0;
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state3 = state2;
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state2 = state1;
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state1 = state0;
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state0 = (t1 + t2) | 0;
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}
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state[0] += state0;
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state[1] += state1;
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state[2] += state2;
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state[3] += state3;
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state[4] += state4;
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state[5] += state5;
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state[6] += state6;
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state[7] += state7;
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};
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return RawSha256;
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}());
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exports.RawSha256 = RawSha256;
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//# sourceMappingURL=RawSha256.js.map
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