From 481c997b300a4828e4525ab9a5fd27db56595b41 Mon Sep 17 00:00:00 2001 From: "L. Bradley LaBoon" Date: Sun, 19 Jan 2020 22:25:33 -0500 Subject: [PATCH] Initial commit --- LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 12 + md5.js | 140 ++++++++++++ 3 files changed, 826 insertions(+) create mode 100644 LICENSE create mode 100644 README.md create mode 100644 md5.js diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..998a263 --- /dev/null +++ b/README.md @@ -0,0 +1,12 @@ +# md5.js +`md5.js` is a JavaScript implementation of the MD5 hash function. It mostly follows the reference implementation published on [Wikipedia](https://en.wikipedia.org/wiki/MD5#Pseudocode). + +## Usage +`md5.js` is written as a native JavaScript module (it is **not** a NodeJS module). This is a relatively new feature of JavaScript which is supported by [most major browsers](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules#Browser_support). +You can import it into other scripts with a statement such as the following: `import { md5 } from "/path/to/md5.js";` + +The `md5` function takes an input string and returns a string representing the MD5 hash of the input string. + +## Example +`var hash = md5("The quick brown fox jumps over the lazy dog");` +The variable `hash` will contain the string `"9e107d9d372bb6826bd81d3542a419d6"`. diff --git a/md5.js b/md5.js new file mode 100644 index 0000000..2af205a --- /dev/null +++ b/md5.js @@ -0,0 +1,140 @@ +/* + * This file is part of md5.js. + * + * md5.js is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * md5.js is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with md5.js. If not, see . + */ + +function md5(str) +{ + // Convert string to bytes + var data = new TextEncoder("utf-8").encode(str); + + // Constants + var s = new Uint32Array([ + 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, + 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, + 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, + 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 + ]); + + var K = new Uint32Array([ + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, + 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, + 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, + 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, + 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, + 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, + 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, + 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, + 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, + 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, + 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, + 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, + 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, + 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, + 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, + 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 + ]); + + // Initialize hash + var hash = new Uint32Array([0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476]); + + // Apply padding + var padLength = data.length + 1; + while (padLength % 64 != 56) + padLength++; + padLength += 8; + + var padData = new Uint8Array(padLength); + for (var i = 0; i < data.length; i++) + padData[i] = data[i]; + for (var i = data.length; i < padLength; i++) + padData[i] = 0x0; + + // Append 1 bit + padData[data.length] = 0x80; + + // Append original length + var bits = data.length * 8; + var upperLen = parseInt(bits.toString(16).slice(0, -8), 16); + if (isNaN(upperLen)) + upperLen = 0; + padData[padLength-8] = bits; + padData[padLength-7] = bits >>> 8; + padData[padLength-6] = bits >>> 16; + padData[padLength-5] = bits >>> 24; + padData[padLength-4] = upperLen; + padData[padLength-3] = upperLen >>> 8; + padData[padLength-2] = upperLen >>> 16; + padData[padLength-1] = upperLen >>> 24; + + // Process the data in 64-byte chunks + for (var i = 0; i < padLength; i += 64) { + var M = new Uint32Array(16); + for (var j = 0, offset = i; j < 16; j++, offset += 4) + M[j] = padData[offset] + (padData[offset+1] << 8) + (padData[offset+2] << 16) + (padData[offset+3] << 24); + + // Main loop + var chunk = new Uint32Array(hash); + for (var j = 0; j < 64; j++) { + var locals = new Uint32Array(2); + if (j <= 15) { + locals[0] = (chunk[1] & chunk[2]) | ((~chunk[1]) & chunk[3]); + locals[1] = j; + } else if (j <= 31) { + locals[0] = (chunk[3] & chunk[1]) | ((~chunk[3]) & chunk[2]); + locals[1] = (5 * j + 1) % 16; + } else if (j <= 47) { + locals[0] = chunk[1] ^ chunk[2] ^ chunk[3]; + locals[1] = (3 * j + 5) % 16; + } else { + locals[0] = chunk[2] ^ (chunk[1] | (~chunk[3])); + locals[1] = (7 * j) % 16; + } + + locals[0] += chunk[0] + K[j] + M[locals[1]]; + chunk[0] = chunk[3]; + chunk[3] = chunk[2]; + chunk[2] = chunk[1]; + chunk[1] += rotl(locals[0], s[j]); + } + + // Add this chunk's hash to the main hash + hash[0] += chunk[0]; + hash[1] += chunk[1]; + hash[2] += chunk[2]; + hash[3] += chunk[3]; + } + + // Convert to string + var md5Str = ""; + for (var i = 0; i < 4; i++) { + var bytes = new Uint8Array([hash[i], hash[i] >> 8, hash[i] >> 16, hash[i] >> 24]); + for (var j = 0; j < 4; j++) { + if (bytes[j] < 0x10) + md5Str += "0"; + md5Str += bytes[j].toString(16); + } + } + + return md5Str; +} + +// Bitwise left-rotate +function rotl(val, sft) +{ + return (val << sft) | (val >>> (32 - sft)); +} + +export { md5 };