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Added SHA-1 and SHA-256 hashing algorithms (#83)
* Added SHA-1 and SHA-256 hashing algorithms * Fixed typos in comments * Removed redundant unsigned integer casting
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‎Hashes/SHA1.js

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//================================================================
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// SHA1.js
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//
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// Module that replicates the SHA-1 Cryptographic Hash
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// function in Javascript.
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//================================================================
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//main variables
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const CHAR_SIZE = 8;
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/**
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* Adds padding to binary/hex string represention
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*
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* @param {string} str - string represention (binary/hex)
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* @param {int} bits - total number of bits wanted
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* @return {string} - string represention padding with empty (0) bits
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*
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* @example
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* pad("10011", 8); // "00010011"
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*/
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function pad(str, bits) {
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let res = str;
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while (res.length % bits !== 0) {
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res = "0" + res;
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}
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return res;
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}
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/**
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* Separates string into chunks of the same size
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*
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* @param {string} str - string to separate into chunks
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* @param {int} size - number of characters wanted in each chunk
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* @return {array} - array of original string split into chunks
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*
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* @example
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* chunkify("this is a test", 2); // ["th", "is", " i", "s ", "a ", "te", "st"]
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*/
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function chunkify(str, size) {
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let chunks = [];
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for (let i = 0; i < str.length; i += size) {
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chunks.push(str.slice(i, i + size));
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}
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return chunks;
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}
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/**
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* Rotates string representation of bits to the left
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*
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* @param {string} bits - string representation of bits
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* @param {int} turns - number of rotations to make
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* @return {string} - string representation of bits after rotation
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*
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* @example
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* rotateLeft("1011", 3); // "1101"
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*/
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function rotateLeft(bits, turns) {
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return bits.substr(turns) + bits.substr(0, turns);
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}
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/**
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* Pre-processes message to feed the algorithm loop
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*
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* @param {string} message - message to pre-process
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* @return {string} - processed message
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*/
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function preProcess(message) {
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//convert message to binary representation padded to
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//8 bits, and add 1
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let m = message.split("")
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.map(e => e.charCodeAt(0))
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.map(e => e.toString(2))
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.map(e => pad(e, 8))
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.join("") + "1";
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//extend message by adding empty bits (0)
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while (m.length % 512 !== 448) {
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m += "0";
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}
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//length of message in binary, padded, and extended
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//to a 64 bit representation
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let ml = (message.length * CHAR_SIZE).toString(2);
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ml = pad(ml, 8);
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ml = "0".repeat(64 - ml.length) + ml;
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return m + ml;
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}
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/**
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* Hashes message using SHA-1 Cryptographic Hash Function
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*
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* @param {string} message - message to hash
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* @return {string} - message digest (hash value)
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*/
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function SHA1(message) {
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//main variables
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let H0 = 0x67452301;
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let H1 = 0xEFCDAB89;
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let H2 = 0x98BADCFE;
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let H3 = 0x10325476;
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let H4 = 0xC3D2E1F0;
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//pre-process message and split into 512 bit chunks
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let bits = preProcess(message);
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let chunks = chunkify(bits, 512);
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chunks.forEach(function(chunk, i) {
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//break each chunk into 16 32-bit words
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let words = chunkify(chunk, 32);
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//extend 16 32-bit words to 80 32-bit words
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for (let i = 16; i < 80; i++) {
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let val = [words[i - 3], words[i - 8], words[i - 14], words[i - 16]]
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.map(e => parseInt(e, 2))
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.reduce((acc, curr) => curr ^ acc, 0);
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let bin = (val >>> 0).toString(2);
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let paddedBin = pad(bin, 32);
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let word = rotateLeft(paddedBin, 1);
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words.push(word);
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}
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//initialize variables for this chunk
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let [a, b, c, d, e] = [H0, H1, H2, H3, H4];
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for (let i = 0; i < 80; i++) {
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let f, k;
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if (i < 20) {
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f = (b & c) | (~b & d);
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k = 0x5A827999;
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}
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else if (i < 40) {
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f = b ^ c ^ d;
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k = 0x6ED9EBA1;
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}
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else if (i < 60) {
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f = (b & c) | (b & d) | (c & d);
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k = 0x8F1BBCDC;
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}
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else {
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f = b ^ c ^ d;
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k = 0xCA62C1D6;
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}
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//make sure f is unsigned
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f >>>= 0;
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let aRot = rotateLeft(pad(a.toString(2), 32), 5);
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let aInt = parseInt(aRot, 2) >>> 0;
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let wordInt = parseInt(words[i], 2) >>> 0;
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let t = aInt + f + e + k + wordInt;
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e = d >>> 0;
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d = c >>> 0;
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let bRot = rotateLeft(pad(b.toString(2), 32), 30);
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c = parseInt(bRot, 2) >>> 0;
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b = a >>> 0;
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a = t >>> 0;
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}
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//add values for this chunk to main hash variables (unsigned)
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H0 = (H0 + a) >>> 0;
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H1 = (H1 + b) >>> 0;
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H2 = (H2 + c) >>> 0;
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H3 = (H3 + d) >>> 0;
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H4 = (H4 + e) >>> 0;
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});
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//combine hash values of main hash variables and return
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let HH = [H0, H1, H2, H3, H4]
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.map(e => e.toString(16))
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.map(e => pad(e, 8))
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.join("");
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return HH;
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}
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console.log(SHA1("A Test"));
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console.log(SHA1("A Test"));
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//export SHA1 function
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module.exports = SHA1;
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‎Hashes/SHA256.js

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//================================================================
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// SHA256.js
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//
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// Module that replicates the SHA-256 Cryptographic Hash
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// function in Javascript.
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//================================================================
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//main variables
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const CHAR_SIZE = 8;
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const K = [
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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];
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/**
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* Adds padding to binary/hex string represention
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*
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* @param {string} str - string represention (binary/hex)
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* @param {int} bits - total number of bits wanted
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* @return {string} - string represention padding with empty (0) bits
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*
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* @example
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* pad("10011", 8); // "00010011"
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*/
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function pad(str, bits) {
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let res = str;
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while (res.length % bits !== 0) {
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res = "0" + res;
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}
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return res;
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}
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/**
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* Separates string into chunks of the same size
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*
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* @param {string} str - string to separate into chunks
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* @param {int} size - number of characters wanted in each chunk
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* @return {array} - array of original string split into chunks
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*
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* @example
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* chunkify("this is a test", 2); // ["th", "is", " i", "s ", "a ", "te", "st"]
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*/
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function chunkify(str, size) {
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let chunks = [];
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for (let i = 0; i < str.length; i += size) {
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chunks.push(str.slice(i, i + size));
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}
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return chunks;
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}
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/**
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* Rotates string represention of bits to th left
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*
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* @param {string} bits - string representation of bits
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* @param {int} turns - number of rotations to make
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* @return {string} - string representation of bits after rotation
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*
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* @example
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* rotateLeft("1011", 3); // "1101"
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*/
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function rotateRight(bits, turns) {
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return bits.substr(bits.length - turns) + bits.substr(0, bits.length - turns);
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}
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/**
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* Pre-processes message to feed the algorithm loop
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*
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* @param {string} message - message to pre-process
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* @return {string} - processed message
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*/
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function preProcess(message) {
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//covert message to binary representation padded to
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//8 bits, and add 1
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let m = message.split("")
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.map(e => e.charCodeAt(0))
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.map(e => e.toString(2))
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.map(e => pad(e, 8))
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.join("") + "1";
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//extend message by adding empty bits (0)
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while (m.length % 512 !== 448) {
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m += "0";
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}
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//length of message in binary, padded, and extended
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//to a 64 bit representation
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let ml = (message.length * CHAR_SIZE).toString(2);
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ml = pad(ml, 8);
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ml = "0".repeat(64 - ml.length) + ml;
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return m + ml;
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}
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/**
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* Hashes message using SHA-256 Cryptographic Hash Function
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*
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* @param {string} message - message to hash
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* @return {string} - message digest (hash value)
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*/
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function SHA256(message) {
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//initial hash variables
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let H0 = 0x6a09e667;
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let H1 = 0xbb67ae85;
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let H2 = 0x3c6ef372;
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let H3 = 0xa54ff53a;
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let H4 = 0x510e527f;
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let H5 = 0x9b05688c;
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let H6 = 0x1f83d9ab;
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let H7 = 0x5be0cd19;
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//pre-process message and split into 512 bit chunks
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let bits = preProcess(message);
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let chunks = chunkify(bits, 512);
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chunks.forEach(function(chunk, i) {
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//break each chunk into 16 32-bit words
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let words = chunkify(chunk, 32);
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//extend 16 32-bit words to 80 32-bit words
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for (let i = 16; i < 64; i++) {
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const W1 = words[i - 15];
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const W2 = words[i - 2];
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const R1 = rotateRight(W1, 7);
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const R2 = rotateRight(W1, 18);
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const R3 = rotateRight(W2, 17);
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const R4 = rotateRight(W2, 19);
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const S0 = parseInt(R1, 2) ^ parseInt(R2, 2) ^ (parseInt(W1, 2) >>> 3);
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const S1 = parseInt(R3, 2) ^ parseInt(R4, 2) ^ (parseInt(W2, 2) >>> 10);
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const val = parseInt(words[i - 16], 2) + S0 + parseInt(words[i - 7], 2) + S1;
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words[i] = pad((val >>> 0).toString(2), 32);
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}
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//initialize variables for this chunk
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let [a, b, c, d, e, f, g, h] = [H0, H1, H2, H3, H4, H5, H6, H7];
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for (let i = 0; i < 64; i++) {
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const S1 = [6, 11, 25]
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.map(turns => rotateRight(pad(e.toString(2), 32), turns))
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.map(bitstring => parseInt(bitstring, 2))
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.reduce((acc, curr) => acc ^ curr, 0) >>> 0;
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const CH = ((e & f) ^ (~e & g)) >>> 0;
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const temp1 = (h + S1 + CH + K[i] + parseInt(words[i], 2)) >>> 0;
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const S0 = [2, 13, 22]
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.map(turns => rotateRight(pad(a.toString(2), 32), turns))
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.map(bitstring => parseInt(bitstring, 2))
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.reduce((acc, curr) => acc ^ curr, 0) >>> 0;
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const maj = ((a & b) ^ (a & c) ^ (b & c)) >>> 0;
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const temp2 = (S0 + maj) >>> 0;
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h = g;
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g = f;
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f = e;
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e = (d + temp1) >>> 0;
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d = c;
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c = b;
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b = a;
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a = (temp1 + temp2) >>> 0;
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}
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//add values for this chunk to main hash variables (unsigned)
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H0 = (H0 + a) >>> 0;
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H1 = (H1 + b) >>> 0;
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H2 = (H2 + c) >>> 0;
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H3 = (H3 + d) >>> 0;
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H4 = (H4 + e) >>> 0;
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H5 = (H5 + f) >>> 0;
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H6 = (H6 + g) >>> 0;
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H7 = (H7 + h) >>> 0;
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});
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//combine hash values of main hash variables and return
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let HH = [H0, H1, H2, H3, H4, H5, H6, H7]
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.map(e => e.toString(16))
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.map(e => pad(e, 8))
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.join("");
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return HH;
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}
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//export SHA256 function
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module.exports = SHA256;

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