177 lines
8.0 KiB
JavaScript
177 lines
8.0 KiB
JavaScript
'use strict';
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var utilUtf8 = require('@smithy/util-utf8');
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const BLOCK_SIZE = 64;
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const DIGEST_LENGTH = 16;
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const INIT = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476];
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class Md5 {
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state;
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buffer;
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bufferLength;
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bytesHashed;
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finished;
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constructor() {
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this.reset();
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}
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update(sourceData) {
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if (isEmptyData(sourceData)) {
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return;
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}
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else 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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const data = convertToBuffer(sourceData);
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let position = 0;
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let { byteLength } = data;
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this.bytesHashed += byteLength;
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while (byteLength > 0) {
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this.buffer.setUint8(this.bufferLength++, data[position++]);
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byteLength--;
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if (this.bufferLength === 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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async digest() {
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if (!this.finished) {
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const { buffer, bufferLength: undecoratedLength, bytesHashed } = this;
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const bitsHashed = bytesHashed * 8;
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buffer.setUint8(this.bufferLength++, 0b10000000);
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if (undecoratedLength % BLOCK_SIZE >= BLOCK_SIZE - 8) {
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for (let i = this.bufferLength; i < BLOCK_SIZE; i++) {
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buffer.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 (let i = this.bufferLength; i < BLOCK_SIZE - 8; i++) {
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buffer.setUint8(i, 0);
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}
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buffer.setUint32(BLOCK_SIZE - 8, bitsHashed >>> 0, true);
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buffer.setUint32(BLOCK_SIZE - 4, Math.floor(bitsHashed / 0x100000000), true);
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this.hashBuffer();
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this.finished = true;
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}
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const out = new DataView(new ArrayBuffer(DIGEST_LENGTH));
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for (let i = 0; i < 4; i++) {
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out.setUint32(i * 4, this.state[i], true);
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}
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return new Uint8Array(out.buffer, out.byteOffset, out.byteLength);
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}
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hashBuffer() {
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const { buffer, state } = this;
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let a = state[0], b = state[1], c = state[2], d = state[3];
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a = ff(a, b, c, d, buffer.getUint32(0, true), 7, 0xd76aa478);
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d = ff(d, a, b, c, buffer.getUint32(4, true), 12, 0xe8c7b756);
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c = ff(c, d, a, b, buffer.getUint32(8, true), 17, 0x242070db);
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b = ff(b, c, d, a, buffer.getUint32(12, true), 22, 0xc1bdceee);
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a = ff(a, b, c, d, buffer.getUint32(16, true), 7, 0xf57c0faf);
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d = ff(d, a, b, c, buffer.getUint32(20, true), 12, 0x4787c62a);
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c = ff(c, d, a, b, buffer.getUint32(24, true), 17, 0xa8304613);
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b = ff(b, c, d, a, buffer.getUint32(28, true), 22, 0xfd469501);
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a = ff(a, b, c, d, buffer.getUint32(32, true), 7, 0x698098d8);
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d = ff(d, a, b, c, buffer.getUint32(36, true), 12, 0x8b44f7af);
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c = ff(c, d, a, b, buffer.getUint32(40, true), 17, 0xffff5bb1);
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b = ff(b, c, d, a, buffer.getUint32(44, true), 22, 0x895cd7be);
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a = ff(a, b, c, d, buffer.getUint32(48, true), 7, 0x6b901122);
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d = ff(d, a, b, c, buffer.getUint32(52, true), 12, 0xfd987193);
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c = ff(c, d, a, b, buffer.getUint32(56, true), 17, 0xa679438e);
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b = ff(b, c, d, a, buffer.getUint32(60, true), 22, 0x49b40821);
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a = gg(a, b, c, d, buffer.getUint32(4, true), 5, 0xf61e2562);
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d = gg(d, a, b, c, buffer.getUint32(24, true), 9, 0xc040b340);
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c = gg(c, d, a, b, buffer.getUint32(44, true), 14, 0x265e5a51);
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b = gg(b, c, d, a, buffer.getUint32(0, true), 20, 0xe9b6c7aa);
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a = gg(a, b, c, d, buffer.getUint32(20, true), 5, 0xd62f105d);
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d = gg(d, a, b, c, buffer.getUint32(40, true), 9, 0x02441453);
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c = gg(c, d, a, b, buffer.getUint32(60, true), 14, 0xd8a1e681);
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b = gg(b, c, d, a, buffer.getUint32(16, true), 20, 0xe7d3fbc8);
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a = gg(a, b, c, d, buffer.getUint32(36, true), 5, 0x21e1cde6);
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d = gg(d, a, b, c, buffer.getUint32(56, true), 9, 0xc33707d6);
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c = gg(c, d, a, b, buffer.getUint32(12, true), 14, 0xf4d50d87);
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b = gg(b, c, d, a, buffer.getUint32(32, true), 20, 0x455a14ed);
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a = gg(a, b, c, d, buffer.getUint32(52, true), 5, 0xa9e3e905);
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d = gg(d, a, b, c, buffer.getUint32(8, true), 9, 0xfcefa3f8);
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c = gg(c, d, a, b, buffer.getUint32(28, true), 14, 0x676f02d9);
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b = gg(b, c, d, a, buffer.getUint32(48, true), 20, 0x8d2a4c8a);
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a = hh(a, b, c, d, buffer.getUint32(20, true), 4, 0xfffa3942);
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d = hh(d, a, b, c, buffer.getUint32(32, true), 11, 0x8771f681);
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c = hh(c, d, a, b, buffer.getUint32(44, true), 16, 0x6d9d6122);
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b = hh(b, c, d, a, buffer.getUint32(56, true), 23, 0xfde5380c);
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a = hh(a, b, c, d, buffer.getUint32(4, true), 4, 0xa4beea44);
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d = hh(d, a, b, c, buffer.getUint32(16, true), 11, 0x4bdecfa9);
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c = hh(c, d, a, b, buffer.getUint32(28, true), 16, 0xf6bb4b60);
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b = hh(b, c, d, a, buffer.getUint32(40, true), 23, 0xbebfbc70);
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a = hh(a, b, c, d, buffer.getUint32(52, true), 4, 0x289b7ec6);
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d = hh(d, a, b, c, buffer.getUint32(0, true), 11, 0xeaa127fa);
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c = hh(c, d, a, b, buffer.getUint32(12, true), 16, 0xd4ef3085);
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b = hh(b, c, d, a, buffer.getUint32(24, true), 23, 0x04881d05);
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a = hh(a, b, c, d, buffer.getUint32(36, true), 4, 0xd9d4d039);
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d = hh(d, a, b, c, buffer.getUint32(48, true), 11, 0xe6db99e5);
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c = hh(c, d, a, b, buffer.getUint32(60, true), 16, 0x1fa27cf8);
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b = hh(b, c, d, a, buffer.getUint32(8, true), 23, 0xc4ac5665);
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a = ii(a, b, c, d, buffer.getUint32(0, true), 6, 0xf4292244);
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d = ii(d, a, b, c, buffer.getUint32(28, true), 10, 0x432aff97);
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c = ii(c, d, a, b, buffer.getUint32(56, true), 15, 0xab9423a7);
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b = ii(b, c, d, a, buffer.getUint32(20, true), 21, 0xfc93a039);
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a = ii(a, b, c, d, buffer.getUint32(48, true), 6, 0x655b59c3);
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d = ii(d, a, b, c, buffer.getUint32(12, true), 10, 0x8f0ccc92);
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c = ii(c, d, a, b, buffer.getUint32(40, true), 15, 0xffeff47d);
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b = ii(b, c, d, a, buffer.getUint32(4, true), 21, 0x85845dd1);
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a = ii(a, b, c, d, buffer.getUint32(32, true), 6, 0x6fa87e4f);
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d = ii(d, a, b, c, buffer.getUint32(60, true), 10, 0xfe2ce6e0);
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c = ii(c, d, a, b, buffer.getUint32(24, true), 15, 0xa3014314);
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b = ii(b, c, d, a, buffer.getUint32(52, true), 21, 0x4e0811a1);
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a = ii(a, b, c, d, buffer.getUint32(16, true), 6, 0xf7537e82);
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d = ii(d, a, b, c, buffer.getUint32(44, true), 10, 0xbd3af235);
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c = ii(c, d, a, b, buffer.getUint32(8, true), 15, 0x2ad7d2bb);
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b = ii(b, c, d, a, buffer.getUint32(36, true), 21, 0xeb86d391);
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state[0] = (a + state[0]) & 0xffffffff;
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state[1] = (b + state[1]) & 0xffffffff;
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state[2] = (c + state[2]) & 0xffffffff;
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state[3] = (d + state[3]) & 0xffffffff;
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}
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reset() {
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this.state = Uint32Array.from(INIT);
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this.buffer = new DataView(new ArrayBuffer(BLOCK_SIZE));
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this.bufferLength = 0;
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this.bytesHashed = 0;
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this.finished = false;
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}
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}
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function cmn(q, a, b, x, s, t) {
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a = (((a + q) & 0xffffffff) + ((x + t) & 0xffffffff)) & 0xffffffff;
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return (((a << s) | (a >>> (32 - s))) + b) & 0xffffffff;
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}
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function ff(a, b, c, d, x, s, t) {
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return cmn((b & c) | (~b & d), a, b, x, s, t);
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}
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function gg(a, b, c, d, x, s, t) {
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return cmn((b & d) | (c & ~d), a, b, x, s, t);
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}
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function hh(a, b, c, d, x, s, t) {
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return cmn(b ^ c ^ d, a, b, x, s, t);
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}
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function ii(a, b, c, d, x, s, t) {
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return cmn(c ^ (b | ~d), a, b, x, s, t);
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}
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function isEmptyData(data) {
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if (typeof data === "string") {
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return data.length === 0;
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}
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return data.byteLength === 0;
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}
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function convertToBuffer(data) {
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if (typeof data === "string") {
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return utilUtf8.fromUtf8(data);
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}
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if (ArrayBuffer.isView(data)) {
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return new Uint8Array(data.buffer, data.byteOffset, data.byteLength / Uint8Array.BYTES_PER_ELEMENT);
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}
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return new Uint8Array(data);
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}
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exports.Md5 = Md5;
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