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radisk file hashing #1005

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radisk file hashing #1005

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24b6733
add: radisk file hashing
sirpy Aug 31, 2020
82d83c1
add: upgrading old format
sirpy Aug 31, 2020
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68 changes: 58 additions & 10 deletions lib/rfs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,29 +3,51 @@ function Store(opt){
opt.log = opt.log || console.log;
opt.file = String(opt.file || 'radata');
var fs = require('fs'), u;

var sha256 = require('./sha256');
var store = function Store(){};
if(Store[opt.file]){
console.log("Warning: reusing same fs store and options as 1st.");
return Store[opt.file];
}

if(!fs.existsSync(opt.file)){ fs.mkdirSync(opt.file) }

const indexFile = opt.file+'/'+opt.file+'.idx'
var logger = fs.createWriteStream(indexFile, {
flags: 'a' // 'a' means appending (old data will be preserved)
})
let cleanupCalled = false
const cleanupIndex = (err) => {
if(cleanupCalled) return;
cleanupCalled = true;
logger.end(() => {
process.exit()
})
}
[`exit`, `SIGINT`, `SIGUSR1`, `SIGUSR2`, `uncaughtException`, `SIGTERM`].forEach((eventType) => {
process.on(eventType, cleanupIndex);
})
var index = {}

Store[opt.file] = store;
var puts = {};

// TODO!!! ADD ZLIB INFLATE / DEFLATE COMPRESSION!
store.put = function(file, data, cb){
puts[file] = data;
var random = Math.random().toString(36).slice(-3);
var tmp = opt.file+'-'+file+'-'+random+'.tmp';
const hash = sha256.hash(file);
var tmp = opt.file+'-'+hash+'-'+random+'.tmp';
fs.writeFile(tmp, data, function(err, ok){
delete puts[file];
if(err){ return cb(err) }
move(tmp, opt.file+'/'+file, cb);
move(tmp, file,hash, cb);
});
};
store.get = function(file, cb){ var tmp; // this took 3s+?
if(tmp = puts[file]){ cb(u, tmp); return }
fs.readFile(opt.file+'/'+file, function(err, data){
const hash = sha256.hash(file);
fs.readFile(opt.file+'/'+hash, function(err, data){
if(err){
if('ENOENT' === (err.code||'').toUpperCase()){
return cb();
Expand All @@ -36,9 +58,18 @@ function Store(opt){
});
};

if(!fs.existsSync(opt.file)){ fs.mkdirSync(opt.file) }

function move(oldPath, newPath, cb) {
function move(oldPath, file, hash, cb) {
const newPath = opt.file+'/'+hash;
if(!index[hash])
{
index[hash] = true;

logger.write(file+'\n',function(err){
if(err)
cb(err)
})
}
fs.rename(oldPath, newPath, function (err) {
if (err) {
if (err.code === 'EXDEV') {
Expand All @@ -63,10 +94,27 @@ function Store(opt){
};

store.list = function(cb, match, params, cbs){
var dir = fs.readdirSync(opt.file);
dir.forEach(function(file){
cb(file);
})
if(fs.existsSync(indexFile))
{
fs.readFileSync(indexFile,'utf8').split(/\r?\n/).forEach(fn => {
//skip the empty line
if(!fn) return;
index[sha256.hash(fn)] = true
cb(fn)
});
}
//try to perform upgrade if index is empty
if(Object.keys(index).length === 0) {
const re = /^[0-9A-Fa-f]+$/g;
const dir = fs.readdirSync(opt.file);
dir.forEach(function(fn){
//convert only non 32byte hex filenames (ie not in new format)
if(!fn || fn === opt.file+'.idx' || (fn.length===64 && re.test(fn)) ) return;
const hash = sha256.hash(fn);
move(opt.file+"/"+fn,fn,hash,() => {})
cb(fn)
})
}
cb();
};

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180 changes: 180 additions & 0 deletions lib/sha256.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,180 @@
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* SHA-256 (FIPS 180-4) implementation in JavaScript (c) Chris Veness 2002-2019 */
/* MIT Licence */
/* www.movable-type.co.uk/scripts/sha256.html */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */


/**
* SHA-256 hash function reference implementation.
*
* This is an annotated direct implementation of FIPS 180-4, without any optimisations. It is
* intended to aid understanding of the algorithm rather than for production use.
*
* While it could be used where performance is not critical, I would recommend using the ‘Web
* Cryptography API’ (developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest) for the browser,
* or the ‘crypto’ library (nodejs.org/api/crypto.html#crypto_class_hash) in Node.js.
*
* See csrc.nist.gov/groups/ST/toolkit/secure_hashing.html
* csrc.nist.gov/groups/ST/toolkit/examples.html
*/
class Sha256 {

/**
* Generates SHA-256 hash of string.
*
* @param {string} msg - (Unicode) string to be hashed.
* @param {Object} [options]
* @param {string} [options.msgFormat=string] - Message format: 'string' for JavaScript string
* (gets converted to UTF-8 for hashing); 'hex-bytes' for string of hex bytes ('616263' ≡ 'abc') .
* @param {string} [options.outFormat=hex] - Output format: 'hex' for string of contiguous
* hex bytes; 'hex-w' for grouping hex bytes into groups of (4 byte / 8 character) words.
* @returns {string} Hash of msg as hex character string.
*
* @example
* import Sha256 from './sha256.js';
* const hash = Sha256.hash('abc'); // 'ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad'
*/
static hash(msg, options) {
const defaults = { msgFormat: 'string', outFormat: 'hex' };
const opt = Object.assign(defaults, options);

// note use throughout this routine of 'n >>> 0' to coerce Number 'n' to unsigned 32-bit integer

switch (opt.msgFormat) {
default: // default is to convert string to UTF-8, as SHA only deals with byte-streams
case 'string': msg = utf8Encode(msg); break;
case 'hex-bytes':msg = hexBytesToString(msg); break; // mostly for running tests
}

// constants [§4.2.2]
const K = [
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 ];

// initial hash value [§5.3.3]
const H = [
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 ];

// PREPROCESSING [§6.2.1]

msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string [§5.1.1]

// convert string msg into 512-bit blocks (array of 16 32-bit integers) [§5.2.1]
const l = msg.length/4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length
const N = Math.ceil(l/16); // number of 16-integer (512-bit) blocks required to hold 'l' ints
const M = new Array(N); // message M is N×16 array of 32-bit integers

for (let i=0; i<N; i++) {
M[i] = new Array(16);
for (let j=0; j<16; j++) { // encode 4 chars per integer (64 per block), big-endian encoding
M[i][j] = (msg.charCodeAt(i*64+j*4+0)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16)
| (msg.charCodeAt(i*64+j*4+2)<< 8) | (msg.charCodeAt(i*64+j*4+3)<< 0);
} // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
}
// add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
// note: most significant word would be (len-1)*8 >>> 32, but since JS converts
// bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
const lenHi = ((msg.length-1)*8) / Math.pow(2, 32);
const lenLo = ((msg.length-1)*8) >>> 0;
M[N-1][14] = Math.floor(lenHi);
M[N-1][15] = lenLo;


// HASH COMPUTATION [§6.2.2]

for (let i=0; i<N; i++) {
const W = new Array(64);

// 1 - prepare message schedule 'W'
for (let t=0; t<16; t++) W[t] = M[i][t];
for (let t=16; t<64; t++) {
W[t] = (Sha256.σ1(W[t-2]) + W[t-7] + Sha256.σ0(W[t-15]) + W[t-16]) >>> 0;
}

// 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
let a = H[0], b = H[1], c = H[2], d = H[3], e = H[4], f = H[5], g = H[6], h = H[7];

// 3 - main loop (note '>>> 0' for 'addition modulo 2^32')
for (let t=0; t<64; t++) {
const T1 = h + Sha256.Σ1(e) + Sha256.Ch(e, f, g) + K[t] + W[t];
const T2 = Sha256.Σ0(a) + Sha256.Maj(a, b, c);
h = g;
g = f;
f = e;
e = (d + T1) >>> 0;
d = c;
c = b;
b = a;
a = (T1 + T2) >>> 0;
}

// 4 - compute the new intermediate hash value (note '>>> 0' for 'addition modulo 2^32')
H[0] = (H[0]+a) >>> 0;
H[1] = (H[1]+b) >>> 0;
H[2] = (H[2]+c) >>> 0;
H[3] = (H[3]+d) >>> 0;
H[4] = (H[4]+e) >>> 0;
H[5] = (H[5]+f) >>> 0;
H[6] = (H[6]+g) >>> 0;
H[7] = (H[7]+h) >>> 0;
}

// convert H0..H7 to hex strings (with leading zeros)
for (let h=0; h<H.length; h++) H[h] = ('00000000'+H[h].toString(16)).slice(-8);

// concatenate H0..H7, with separator if required
const separator = opt.outFormat=='hex-w' ? ' ' : '';

return H.join(separator);

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

function utf8Encode(str) {
try {
return new TextEncoder().encode(str, 'utf-8').reduce((prev, curr) => prev + String.fromCharCode(curr), '');
} catch (e) { // no TextEncoder available?
return unescape(encodeURIComponent(str)); // monsur.hossa.in/2012/07/20/utf-8-in-javascript.html
}
}

function hexBytesToString(hexStr) { // convert string of hex numbers to a string of chars (eg '616263' -> 'abc').
const str = hexStr.replace(' ', ''); // allow space-separated groups
return str=='' ? '' : str.match(/.{2}/g).map(byte => String.fromCharCode(parseInt(byte, 16))).join('');
}
}



/**
* Rotates right (circular right shift) value x by n positions [§3.2.4].
* @private
*/
static ROTR(n, x) {
return (x >>> n) | (x << (32-n));
}


/**
* Logical functions [§4.1.2].
* @private
*/
static Σ0(x) { return Sha256.ROTR(2, x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); }
static Σ1(x) { return Sha256.ROTR(6, x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); }
static σ0(x) { return Sha256.ROTR(7, x) ^ Sha256.ROTR(18, x) ^ (x>>>3); }
static σ1(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); }
static Ch(x, y, z) { return (x & y) ^ (~x & z); } // 'choice'
static Maj(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); } // 'majority'

}


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

module.exports = Sha256;
12 changes: 12 additions & 0 deletions test/rad/rad.js
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Original file line number Diff line number Diff line change
Expand Up @@ -278,6 +278,18 @@ var names = ["Adalard","Adora","Aia","Albertina","Alfie","Allyn","Amabil","Ammam

});

describe("RAD file hash",function(){
it("should have index file",function(done){
let found = false
opt.store.list((fn) => {
if(fn !== undefined) { found = true; return}
else {
expect(found).to.be.ok()
done()
}
})
})
})
var ntmp = names;
describe('RAD + GUN', function(){
var ochunk = 1000;
Expand Down