gl-store-s3.js/node_modules/aws-sdk/lib/browserSha256.js

240 lines
5.9 KiB
JavaScript

var Buffer = require('buffer/').Buffer;
var hashUtils = require('./browserHashUtils');
var BLOCK_SIZE = 64;
var DIGEST_LENGTH = 32;
var KEY = new Uint32Array([
0x428a2f98,
0x71374491,
0xb5c0fbcf,
0xe9b5dba5,
0x3956c25b,
0x59f111f1,
0x923f82a4,
0xab1c5ed5,
0xd807aa98,
0x12835b01,
0x243185be,
0x550c7dc3,
0x72be5d74,
0x80deb1fe,
0x9bdc06a7,
0xc19bf174,
0xe49b69c1,
0xefbe4786,
0x0fc19dc6,
0x240ca1cc,
0x2de92c6f,
0x4a7484aa,
0x5cb0a9dc,
0x76f988da,
0x983e5152,
0xa831c66d,
0xb00327c8,
0xbf597fc7,
0xc6e00bf3,
0xd5a79147,
0x06ca6351,
0x14292967,
0x27b70a85,
0x2e1b2138,
0x4d2c6dfc,
0x53380d13,
0x650a7354,
0x766a0abb,
0x81c2c92e,
0x92722c85,
0xa2bfe8a1,
0xa81a664b,
0xc24b8b70,
0xc76c51a3,
0xd192e819,
0xd6990624,
0xf40e3585,
0x106aa070,
0x19a4c116,
0x1e376c08,
0x2748774c,
0x34b0bcb5,
0x391c0cb3,
0x4ed8aa4a,
0x5b9cca4f,
0x682e6ff3,
0x748f82ee,
0x78a5636f,
0x84c87814,
0x8cc70208,
0x90befffa,
0xa4506ceb,
0xbef9a3f7,
0xc67178f2
]);
var INIT = [
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19,
];
var MAX_HASHABLE_LENGTH = Math.pow(2, 53) - 1;
/**
* @private
*/
function Sha256() {
this.state = [
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19,
];
this.temp = new Int32Array(64);
this.buffer = new Uint8Array(64);
this.bufferLength = 0;
this.bytesHashed = 0;
/**
* @private
*/
this.finished = false;
}
/**
* @api private
*/
module.exports = exports = Sha256;
Sha256.BLOCK_SIZE = BLOCK_SIZE;
Sha256.prototype.update = function (data) {
if (this.finished) {
throw new Error('Attempted to update an already finished hash.');
}
if (hashUtils.isEmptyData(data)) {
return this;
}
data = hashUtils.convertToBuffer(data);
var position = 0;
var byteLength = data.byteLength;
this.bytesHashed += byteLength;
if (this.bytesHashed * 8 > MAX_HASHABLE_LENGTH) {
throw new Error('Cannot hash more than 2^53 - 1 bits');
}
while (byteLength > 0) {
this.buffer[this.bufferLength++] = data[position++];
byteLength--;
if (this.bufferLength === BLOCK_SIZE) {
this.hashBuffer();
this.bufferLength = 0;
}
}
return this;
};
Sha256.prototype.digest = function (encoding) {
if (!this.finished) {
var bitsHashed = this.bytesHashed * 8;
var bufferView = new DataView(this.buffer.buffer, this.buffer.byteOffset, this.buffer.byteLength);
var undecoratedLength = this.bufferLength;
bufferView.setUint8(this.bufferLength++, 0x80);
// Ensure the final block has enough room for the hashed length
if (undecoratedLength % BLOCK_SIZE >= BLOCK_SIZE - 8) {
for (var i = this.bufferLength; i < BLOCK_SIZE; i++) {
bufferView.setUint8(i, 0);
}
this.hashBuffer();
this.bufferLength = 0;
}
for (var i = this.bufferLength; i < BLOCK_SIZE - 8; i++) {
bufferView.setUint8(i, 0);
}
bufferView.setUint32(BLOCK_SIZE - 8, Math.floor(bitsHashed / 0x100000000), true);
bufferView.setUint32(BLOCK_SIZE - 4, bitsHashed);
this.hashBuffer();
this.finished = true;
}
// The value in state is little-endian rather than big-endian, so flip
// each word into a new Uint8Array
var out = new Buffer(DIGEST_LENGTH);
for (var i = 0; i < 8; i++) {
out[i * 4] = (this.state[i] >>> 24) & 0xff;
out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff;
out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff;
out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff;
}
return encoding ? out.toString(encoding) : out;
};
Sha256.prototype.hashBuffer = function () {
var _a = this,
buffer = _a.buffer,
state = _a.state;
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];
for (var i = 0; i < BLOCK_SIZE; i++) {
if (i < 16) {
this.temp[i] = (((buffer[i * 4] & 0xff) << 24) |
((buffer[(i * 4) + 1] & 0xff) << 16) |
((buffer[(i * 4) + 2] & 0xff) << 8) |
(buffer[(i * 4) + 3] & 0xff));
}
else {
var u = this.temp[i - 2];
var t1_1 = (u >>> 17 | u << 15) ^
(u >>> 19 | u << 13) ^
(u >>> 10);
u = this.temp[i - 15];
var t2_1 = (u >>> 7 | u << 25) ^
(u >>> 18 | u << 14) ^
(u >>> 3);
this.temp[i] = (t1_1 + this.temp[i - 7] | 0) +
(t2_1 + this.temp[i - 16] | 0);
}
var t1 = (((((state4 >>> 6 | state4 << 26) ^
(state4 >>> 11 | state4 << 21) ^
(state4 >>> 25 | state4 << 7))
+ ((state4 & state5) ^ (~state4 & state6))) | 0)
+ ((state7 + ((KEY[i] + this.temp[i]) | 0)) | 0)) | 0;
var t2 = (((state0 >>> 2 | state0 << 30) ^
(state0 >>> 13 | state0 << 19) ^
(state0 >>> 22 | state0 << 10)) + ((state0 & state1) ^ (state0 & state2) ^ (state1 & state2))) | 0;
state7 = state6;
state6 = state5;
state5 = state4;
state4 = (state3 + t1) | 0;
state3 = state2;
state2 = state1;
state1 = state0;
state0 = (t1 + t2) | 0;
}
state[0] += state0;
state[1] += state1;
state[2] += state2;
state[3] += state3;
state[4] += state4;
state[5] += state5;
state[6] += state6;
state[7] += state7;
};