Creation of files and directories seems to work
This commit is contained in:
Suzanne Soy
parent
0cf9a71648
commit
5313ac877b
133
index.html
133
index.html
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@ -1,4 +1,9 @@
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<html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<script src="sha256.js"></script>
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</head>
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<body>
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<script>
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<script>
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function hexVarintToInteger(str) {
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function hexVarintToInteger(str) {
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var s = String(str);
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var s = String(str);
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@ -43,6 +48,17 @@ function integerToHexVarint(i) {
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}
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}
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}
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}
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function utf8StringToHex(str) {
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var s = String(str);
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var result = '';
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for (var i = 0; i < s.length; i++) {
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var hex = s.charCodeAt(i).toString(16);
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if (hex.length < 2) { hex = '0' + hex; }
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result += hex;
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}
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return result;
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}
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function ipfsBlockWithLinks(object) {
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function ipfsBlockWithLinks(object) {
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// object should be an { "Links": links, "Data": hex-encoded string } object
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// object should be an { "Links": links, "Data": hex-encoded string } object
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// Aside from encoding differences, it should match the contents of the "ipfs object get --data-encoding=base64 Qm…hash" command
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// Aside from encoding differences, it should match the contents of the "ipfs object get --data-encoding=base64 Qm…hash" command
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@ -63,11 +79,16 @@ function ipfsBlockWithLinks(object) {
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for (var i = 0; i < links.length; i++) {
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for (var i = 0; i < links.length; i++) {
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var cid = links[i].Hash;
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var cid = links[i].Hash;
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var size = links[i].Size;
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var size = links[i].Size;
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var name = links[i].Name;
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result += '12';
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var encodedLink = ''
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// Some sort of separator or terminator
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encodedLink += '0a';
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// Add a first hardcoded part of the encoding.
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result += '12' + '2a' + '0a';
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// size of the CID (32 bytes + 2 bytes header = 34 bytes = 22 in hex)
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// size of the CID (32 bytes + 2 bytes header = 34 bytes = 22 in hex)
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result += '22';
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encodedLink += '22';
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if (cid[0] != 'f' || cid.length != 69) {
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if (cid[0] != 'f' || cid.length != 69) {
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throw "Expected a lowercase base16 CIDv1. The base16 encoding should start with 'f'" +
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throw "Expected a lowercase base16 CIDv1. The base16 encoding should start with 'f'" +
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@ -76,14 +97,22 @@ function ipfsBlockWithLinks(object) {
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}
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}
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// Add the CID.
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// Add the CID.
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result += cid.substring(1);
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encodedLink += cid.substring(1);
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// Add a second hardcoded part of the encoding.
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// Add a second hardcoded part of the encoding.
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result += '12' + '00' + '18';
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encodedLink += '12';
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// length of filename
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encodedLink += integerToHexVarint(name.length);
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encodedLink += utf8StringToHex(name);
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encodedLink += '18';
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// Add the size.
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// Add the size.
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result += integerToHexVarint(size);
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encodedLink += integerToHexVarint(size);
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var encodedLinkSize = encodedLink.length/2
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result += integerToHexVarint(encodedLinkSize);
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result += encodedLink;
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}
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}
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// Some sort of separator or terminator
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// Some sort of separator or terminator
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@ -113,74 +142,26 @@ function ipfsBlockWithFile(fileHex) {
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return result;
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return result;
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}
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}
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function ipfsBlockWithDirectory(object) {
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document.write('<p>'+hexVarintToInteger('8f9007')+'</p>');
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var links = object.Links;
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document.write('<p>'+hexVarintToInteger('8e9007')+'</p>');
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var data = object.Data;
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document.write('<p>'+hexVarintToInteger('00')+'</p>');
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var result = '';
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document.write('<p>'+hexVarintToInteger('01')+'</p>');
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document.write('<p>'+hexVarintToInteger('ac02')+'</p>');
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document.write('<p>'+hexVarintToInteger('9db005')+'</p>');
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document.write('<p>'+hexVarintToInteger('8e8010')+'</p>');
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for (var i = 0; i < links.length; i++) {
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document.write('<p>'+integerToHexVarint(262158)+'</p>');
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var cid = links[i].Hash;
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document.write('<p>'+integerToHexVarint(88093)+'</p>');
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var size = links[i].Size;
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document.write('<p>'+integerToHexVarint(300)+'</p>');
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var name = links[i].Name;
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document.write('<p>'+integerToHexVarint(1)+'</p>');
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document.write('<p>'+integerToHexVarint(0)+'</p>');
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result += '12';
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// size of something
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result += '36';
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// some sort of separator or terminator
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result += '0a';
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// size of the CID (32 bytes + 2 bytes header = 34 bytes = 22 in hex)
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result += '22';
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if (cid[0] != 'f' || cid.length != 69) {
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throw "Expected a lowercase base16 CIDv1. The base16 encoding should start with 'f'" +
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/*+*/ " and have a length of 32 bytes (64 hexadecimal characters) plus the leading prefix 'f1220' (length of 69 characters in total)" +
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/*+*/ " as described in https://github.com/multiformats/multibase. The given hash started with " + cid[0] + " and had a length of " + cid.length;
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}
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// Add the CID.
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result += cid.substring(1);
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// Add a second hardcoded part of the encoding.
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result += '12';
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// length of filename
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result += integerToHexVarint(name.length);
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result += stringToHex(name.length);
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result += '18';
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// Add the size.
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result += integerToHexVarint(size);
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}
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// some sort of separator or terminator
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result += '0a';
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dataSize = data.length/2;
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result += integerToHexVarint(dataSize);
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result += data;
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return result;
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}
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document.write('<p>'+hexVarintToInteger('8f9007'));
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document.write('<p>'+hexVarintToInteger('8e9007'));
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document.write('<p>'+hexVarintToInteger('00'));
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document.write('<p>'+hexVarintToInteger('01'));
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document.write('<p>'+hexVarintToInteger('ac02'));
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document.write('<p>'+hexVarintToInteger('9db005'));
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document.write('<p>'+hexVarintToInteger('8e8010'));
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document.write('<p>'+integerToHexVarint(262158));
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document.write('<p>'+integerToHexVarint(88093));
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document.write('<p>'+integerToHexVarint(300));
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document.write('<p>'+integerToHexVarint(1));
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document.write('<p>'+integerToHexVarint(0));
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// 116751
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// 116751
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document.write('<p>'+integerToHexVarint(116741));
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document.write('<p>'+integerToHexVarint(116741)+'</p>');
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document.write('<p>'+integerToHexVarint(116740));
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document.write('<p>'+integerToHexVarint(116740)+'</p>');
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document.write('<p>'+integerToHexVarint("indexyz.html".length));
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document.write('<p>'+integerToHexVarint("indexyz.html".length)+'</p>');
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document.write('<p>'+integerToHexVarint(116755));
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document.write('<p>'+integerToHexVarint(116755)+'</p>');
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// .ipfs/blocks/Q5/CIQIX5HLOY4SWJHZGH347OHATMFMMMRYCKAU3KHSCL735U4OTTPNQ5I.data
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document.write('<p>'+ipfsBlockWithLinks({
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document.write('<p>'+ipfsBlockWithLinks({
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"Links": [
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"Links": [
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{
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{
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@ -195,8 +176,9 @@ document.write('<p>'+ipfsBlockWithLinks({
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}
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}
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],
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],
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"Data": "0802188fb01520808010208fb005"
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"Data": "0802188fb01520808010208fb005"
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}));
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})+'</p>');
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// .ipfs/blocks/OD/CIQEZBBJX4QYOWN5PECDC2PGQXAXANXYF56NCX5JIPDWHR6HDJBAODY.data
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document.write('<p>'+ipfsBlockWithFile(
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document.write('<p>'+ipfsBlockWithFile(
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"3c21444f43545950452068746d6c3e0a3c68746d6c3e0a3c686561643e0a" +
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"3c21444f43545950452068746d6c3e0a3c68746d6c3e0a3c686561643e0a" +
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"3c6d65746120687474702d65717569763d22436f6e74656e742d54797065" +
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"3c6d65746120687474702d65717569763d22436f6e74656e742d54797065" +
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@ -4090,9 +4072,9 @@ document.write('<p>'+ipfsBlockWithFile(
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"28736372697074293b0a20207d2928293b0a20205f5f5f6769745f747574" +
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"28736372697074293b0a20207d2928293b0a20205f5f5f6769745f747574" +
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"6f7269616c5f6f6e6c6f616428290a3c2f7363726970743e0a3c2f626f64" +
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"6f7269616c5f6f6e6c6f616428290a3c2f7363726970743e0a3c2f626f64" +
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"793e0a3c2f68746d6c3e0a"
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"793e0a3c2f68746d6c3e0a"
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));
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)+'</p>');
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document.write('<p>'+ipfsBlockWithDirectory(
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document.write('<p>'+ipfsBlockWithLinks(
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{
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{
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"Links": [
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"Links": [
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{
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{
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@ -4103,7 +4085,8 @@ document.write('<p>'+ipfsBlockWithDirectory(
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],
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],
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"Data": "0801"
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"Data": "0801"
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}
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}
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));
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)+'</p>');
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</script>
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</script>
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</body>
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</html>
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</html>
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428
sha256.js
Normal file
428
sha256.js
Normal file
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@ -0,0 +1,428 @@
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// https://github.com/dchest/fast-sha256-js Unlicense (Public Domain)
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(function (root, factory) {
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// Hack to make all exports of this module sha256 function object properties.
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var exports = {};
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factory(exports);
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var sha256 = exports["default"];
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for (var k in exports) {
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sha256[k] = exports[k];
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}
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if (typeof module === 'object' && typeof module.exports === 'object') {
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module.exports = sha256;
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} else if (typeof define === 'function' && define.amd) {
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define(function() { return sha256; });
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} else {
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root.sha256 = sha256;
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}
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})(this, function(exports) {
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"use strict";
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exports.__esModule = true;
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// SHA-256 (+ HMAC and PBKDF2) for JavaScript.
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//
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// Written in 2014-2016 by Dmitry Chestnykh.
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// Public domain, no warranty.
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//
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// Functions (accept and return Uint8Arrays):
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//
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// sha256(message) -> hash
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// sha256.hmac(key, message) -> mac
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// sha256.pbkdf2(password, salt, rounds, dkLen) -> dk
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//
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// Classes:
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//
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// new sha256.Hash()
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// new sha256.HMAC(key)
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//
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exports.digestLength = 32;
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exports.blockSize = 64;
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// SHA-256 constants
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var K = new Uint32Array([
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
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0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
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0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
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0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
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0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
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0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
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0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
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0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
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0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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]);
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function hashBlocks(w, v, p, pos, len) {
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var a, b, c, d, e, f, g, h, u, i, j, t1, t2;
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while (len >= 64) {
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a = v[0];
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b = v[1];
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c = v[2];
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d = v[3];
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e = v[4];
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f = v[5];
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g = v[6];
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h = v[7];
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for (i = 0; i < 16; i++) {
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j = pos + i * 4;
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w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |
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((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff));
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}
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for (i = 16; i < 64; i++) {
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u = w[i - 2];
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t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10);
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u = w[i - 15];
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t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3);
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w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0);
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}
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for (i = 0; i < 64; i++) {
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t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^
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(e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +
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((h + ((K[i] + w[i]) | 0)) | 0)) | 0;
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t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^
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(a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 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 + t1) | 0;
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d = c;
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c = b;
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b = a;
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a = (t1 + t2) | 0;
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}
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v[0] += a;
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v[1] += b;
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v[2] += c;
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v[3] += d;
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v[4] += e;
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v[5] += f;
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v[6] += g;
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v[7] += h;
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pos += 64;
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len -= 64;
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}
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return pos;
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}
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// Hash implements SHA256 hash algorithm.
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var Hash = /** @class */ (function () {
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function Hash() {
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this.digestLength = exports.digestLength;
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this.blockSize = exports.blockSize;
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// Note: Int32Array is used instead of Uint32Array for performance reasons.
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this.state = new Int32Array(8); // hash state
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this.temp = new Int32Array(64); // temporary state
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this.buffer = new Uint8Array(128); // buffer for data to hash
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this.bufferLength = 0; // number of bytes in buffer
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this.bytesHashed = 0; // number of total bytes hashed
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this.finished = false; // indicates whether the hash was finalized
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this.reset();
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}
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|
// Resets hash state making it possible
|
||||||
|
// to re-use this instance to hash other data.
|
||||||
|
Hash.prototype.reset = function () {
|
||||||
|
this.state[0] = 0x6a09e667;
|
||||||
|
this.state[1] = 0xbb67ae85;
|
||||||
|
this.state[2] = 0x3c6ef372;
|
||||||
|
this.state[3] = 0xa54ff53a;
|
||||||
|
this.state[4] = 0x510e527f;
|
||||||
|
this.state[5] = 0x9b05688c;
|
||||||
|
this.state[6] = 0x1f83d9ab;
|
||||||
|
this.state[7] = 0x5be0cd19;
|
||||||
|
this.bufferLength = 0;
|
||||||
|
this.bytesHashed = 0;
|
||||||
|
this.finished = false;
|
||||||
|
return this;
|
||||||
|
};
|
||||||
|
// Cleans internal buffers and re-initializes hash state.
|
||||||
|
Hash.prototype.clean = function () {
|
||||||
|
for (var i = 0; i < this.buffer.length; i++) {
|
||||||
|
this.buffer[i] = 0;
|
||||||
|
}
|
||||||
|
for (var i = 0; i < this.temp.length; i++) {
|
||||||
|
this.temp[i] = 0;
|
||||||
|
}
|
||||||
|
this.reset();
|
||||||
|
};
|
||||||
|
// Updates hash state with the given data.
|
||||||
|
//
|
||||||
|
// Optionally, length of the data can be specified to hash
|
||||||
|
// fewer bytes than data.length.
|
||||||
|
//
|
||||||
|
// Throws error when trying to update already finalized hash:
|
||||||
|
// instance must be reset to use it again.
|
||||||
|
Hash.prototype.update = function (data, dataLength) {
|
||||||
|
if (dataLength === void 0) { dataLength = data.length; }
|
||||||
|
if (this.finished) {
|
||||||
|
throw new Error("SHA256: can't update because hash was finished.");
|
||||||
|
}
|
||||||
|
var dataPos = 0;
|
||||||
|
this.bytesHashed += dataLength;
|
||||||
|
if (this.bufferLength > 0) {
|
||||||
|
while (this.bufferLength < 64 && dataLength > 0) {
|
||||||
|
this.buffer[this.bufferLength++] = data[dataPos++];
|
||||||
|
dataLength--;
|
||||||
|
}
|
||||||
|
if (this.bufferLength === 64) {
|
||||||
|
hashBlocks(this.temp, this.state, this.buffer, 0, 64);
|
||||||
|
this.bufferLength = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (dataLength >= 64) {
|
||||||
|
dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength);
|
||||||
|
dataLength %= 64;
|
||||||
|
}
|
||||||
|
while (dataLength > 0) {
|
||||||
|
this.buffer[this.bufferLength++] = data[dataPos++];
|
||||||
|
dataLength--;
|
||||||
|
}
|
||||||
|
return this;
|
||||||
|
};
|
||||||
|
// Finalizes hash state and puts hash into out.
|
||||||
|
//
|
||||||
|
// If hash was already finalized, puts the same value.
|
||||||
|
Hash.prototype.finish = function (out) {
|
||||||
|
if (!this.finished) {
|
||||||
|
var bytesHashed = this.bytesHashed;
|
||||||
|
var left = this.bufferLength;
|
||||||
|
var bitLenHi = (bytesHashed / 0x20000000) | 0;
|
||||||
|
var bitLenLo = bytesHashed << 3;
|
||||||
|
var padLength = (bytesHashed % 64 < 56) ? 64 : 128;
|
||||||
|
this.buffer[left] = 0x80;
|
||||||
|
for (var i = left + 1; i < padLength - 8; i++) {
|
||||||
|
this.buffer[i] = 0;
|
||||||
|
}
|
||||||
|
this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff;
|
||||||
|
this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff;
|
||||||
|
this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff;
|
||||||
|
this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff;
|
||||||
|
this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff;
|
||||||
|
this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff;
|
||||||
|
this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff;
|
||||||
|
this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff;
|
||||||
|
hashBlocks(this.temp, this.state, this.buffer, 0, padLength);
|
||||||
|
this.finished = true;
|
||||||
|
}
|
||||||
|
for (var i = 0; i < 8; i++) {
|
||||||
|
out[i * 4 + 0] = (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 this;
|
||||||
|
};
|
||||||
|
// Returns the final hash digest.
|
||||||
|
Hash.prototype.digest = function () {
|
||||||
|
var out = new Uint8Array(this.digestLength);
|
||||||
|
this.finish(out);
|
||||||
|
return out;
|
||||||
|
};
|
||||||
|
// Internal function for use in HMAC for optimization.
|
||||||
|
Hash.prototype._saveState = function (out) {
|
||||||
|
for (var i = 0; i < this.state.length; i++) {
|
||||||
|
out[i] = this.state[i];
|
||||||
|
}
|
||||||
|
};
|
||||||
|
// Internal function for use in HMAC for optimization.
|
||||||
|
Hash.prototype._restoreState = function (from, bytesHashed) {
|
||||||
|
for (var i = 0; i < this.state.length; i++) {
|
||||||
|
this.state[i] = from[i];
|
||||||
|
}
|
||||||
|
this.bytesHashed = bytesHashed;
|
||||||
|
this.finished = false;
|
||||||
|
this.bufferLength = 0;
|
||||||
|
};
|
||||||
|
return Hash;
|
||||||
|
}());
|
||||||
|
exports.Hash = Hash;
|
||||||
|
// HMAC implements HMAC-SHA256 message authentication algorithm.
|
||||||
|
var HMAC = /** @class */ (function () {
|
||||||
|
function HMAC(key) {
|
||||||
|
this.inner = new Hash();
|
||||||
|
this.outer = new Hash();
|
||||||
|
this.blockSize = this.inner.blockSize;
|
||||||
|
this.digestLength = this.inner.digestLength;
|
||||||
|
var pad = new Uint8Array(this.blockSize);
|
||||||
|
if (key.length > this.blockSize) {
|
||||||
|
(new Hash()).update(key).finish(pad).clean();
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
for (var i = 0; i < key.length; i++) {
|
||||||
|
pad[i] = key[i];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
for (var i = 0; i < pad.length; i++) {
|
||||||
|
pad[i] ^= 0x36;
|
||||||
|
}
|
||||||
|
this.inner.update(pad);
|
||||||
|
for (var i = 0; i < pad.length; i++) {
|
||||||
|
pad[i] ^= 0x36 ^ 0x5c;
|
||||||
|
}
|
||||||
|
this.outer.update(pad);
|
||||||
|
this.istate = new Uint32Array(8);
|
||||||
|
this.ostate = new Uint32Array(8);
|
||||||
|
this.inner._saveState(this.istate);
|
||||||
|
this.outer._saveState(this.ostate);
|
||||||
|
for (var i = 0; i < pad.length; i++) {
|
||||||
|
pad[i] = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Returns HMAC state to the state initialized with key
|
||||||
|
// to make it possible to run HMAC over the other data with the same
|
||||||
|
// key without creating a new instance.
|
||||||
|
HMAC.prototype.reset = function () {
|
||||||
|
this.inner._restoreState(this.istate, this.inner.blockSize);
|
||||||
|
this.outer._restoreState(this.ostate, this.outer.blockSize);
|
||||||
|
return this;
|
||||||
|
};
|
||||||
|
// Cleans HMAC state.
|
||||||
|
HMAC.prototype.clean = function () {
|
||||||
|
for (var i = 0; i < this.istate.length; i++) {
|
||||||
|
this.ostate[i] = this.istate[i] = 0;
|
||||||
|
}
|
||||||
|
this.inner.clean();
|
||||||
|
this.outer.clean();
|
||||||
|
};
|
||||||
|
// Updates state with provided data.
|
||||||
|
HMAC.prototype.update = function (data) {
|
||||||
|
this.inner.update(data);
|
||||||
|
return this;
|
||||||
|
};
|
||||||
|
// Finalizes HMAC and puts the result in out.
|
||||||
|
HMAC.prototype.finish = function (out) {
|
||||||
|
if (this.outer.finished) {
|
||||||
|
this.outer.finish(out);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
this.inner.finish(out);
|
||||||
|
this.outer.update(out, this.digestLength).finish(out);
|
||||||
|
}
|
||||||
|
return this;
|
||||||
|
};
|
||||||
|
// Returns message authentication code.
|
||||||
|
HMAC.prototype.digest = function () {
|
||||||
|
var out = new Uint8Array(this.digestLength);
|
||||||
|
this.finish(out);
|
||||||
|
return out;
|
||||||
|
};
|
||||||
|
return HMAC;
|
||||||
|
}());
|
||||||
|
exports.HMAC = HMAC;
|
||||||
|
// Returns SHA256 hash of data.
|
||||||
|
function hash(data) {
|
||||||
|
var h = (new Hash()).update(data);
|
||||||
|
var digest = h.digest();
|
||||||
|
h.clean();
|
||||||
|
return digest;
|
||||||
|
}
|
||||||
|
exports.hash = hash;
|
||||||
|
// Function hash is both available as module.hash and as default export.
|
||||||
|
exports["default"] = hash;
|
||||||
|
// Returns HMAC-SHA256 of data under the key.
|
||||||
|
function hmac(key, data) {
|
||||||
|
var h = (new HMAC(key)).update(data);
|
||||||
|
var digest = h.digest();
|
||||||
|
h.clean();
|
||||||
|
return digest;
|
||||||
|
}
|
||||||
|
exports.hmac = hmac;
|
||||||
|
// Fills hkdf buffer like this:
|
||||||
|
// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)
|
||||||
|
function fillBuffer(buffer, hmac, info, counter) {
|
||||||
|
// Counter is a byte value: check if it overflowed.
|
||||||
|
var num = counter[0];
|
||||||
|
if (num === 0) {
|
||||||
|
throw new Error("hkdf: cannot expand more");
|
||||||
|
}
|
||||||
|
// Prepare HMAC instance for new data with old key.
|
||||||
|
hmac.reset();
|
||||||
|
// Hash in previous output if it was generated
|
||||||
|
// (i.e. counter is greater than 1).
|
||||||
|
if (num > 1) {
|
||||||
|
hmac.update(buffer);
|
||||||
|
}
|
||||||
|
// Hash in info if it exists.
|
||||||
|
if (info) {
|
||||||
|
hmac.update(info);
|
||||||
|
}
|
||||||
|
// Hash in the counter.
|
||||||
|
hmac.update(counter);
|
||||||
|
// Output result to buffer and clean HMAC instance.
|
||||||
|
hmac.finish(buffer);
|
||||||
|
// Increment counter inside typed array, this works properly.
|
||||||
|
counter[0]++;
|
||||||
|
}
|
||||||
|
var hkdfSalt = new Uint8Array(exports.digestLength); // Filled with zeroes.
|
||||||
|
function hkdf(key, salt, info, length) {
|
||||||
|
if (salt === void 0) { salt = hkdfSalt; }
|
||||||
|
if (length === void 0) { length = 32; }
|
||||||
|
var counter = new Uint8Array([1]);
|
||||||
|
// HKDF-Extract uses salt as HMAC key, and key as data.
|
||||||
|
var okm = hmac(salt, key);
|
||||||
|
// Initialize HMAC for expanding with extracted key.
|
||||||
|
// Ensure no collisions with `hmac` function.
|
||||||
|
var hmac_ = new HMAC(okm);
|
||||||
|
// Allocate buffer.
|
||||||
|
var buffer = new Uint8Array(hmac_.digestLength);
|
||||||
|
var bufpos = buffer.length;
|
||||||
|
var out = new Uint8Array(length);
|
||||||
|
for (var i = 0; i < length; i++) {
|
||||||
|
if (bufpos === buffer.length) {
|
||||||
|
fillBuffer(buffer, hmac_, info, counter);
|
||||||
|
bufpos = 0;
|
||||||
|
}
|
||||||
|
out[i] = buffer[bufpos++];
|
||||||
|
}
|
||||||
|
hmac_.clean();
|
||||||
|
buffer.fill(0);
|
||||||
|
counter.fill(0);
|
||||||
|
return out;
|
||||||
|
}
|
||||||
|
exports.hkdf = hkdf;
|
||||||
|
// Derives a key from password and salt using PBKDF2-HMAC-SHA256
|
||||||
|
// with the given number of iterations.
|
||||||
|
//
|
||||||
|
// The number of bytes returned is equal to dkLen.
|
||||||
|
//
|
||||||
|
// (For better security, avoid dkLen greater than hash length - 32 bytes).
|
||||||
|
function pbkdf2(password, salt, iterations, dkLen) {
|
||||||
|
var prf = new HMAC(password);
|
||||||
|
var len = prf.digestLength;
|
||||||
|
var ctr = new Uint8Array(4);
|
||||||
|
var t = new Uint8Array(len);
|
||||||
|
var u = new Uint8Array(len);
|
||||||
|
var dk = new Uint8Array(dkLen);
|
||||||
|
for (var i = 0; i * len < dkLen; i++) {
|
||||||
|
var c = i + 1;
|
||||||
|
ctr[0] = (c >>> 24) & 0xff;
|
||||||
|
ctr[1] = (c >>> 16) & 0xff;
|
||||||
|
ctr[2] = (c >>> 8) & 0xff;
|
||||||
|
ctr[3] = (c >>> 0) & 0xff;
|
||||||
|
prf.reset();
|
||||||
|
prf.update(salt);
|
||||||
|
prf.update(ctr);
|
||||||
|
prf.finish(u);
|
||||||
|
for (var j = 0; j < len; j++) {
|
||||||
|
t[j] = u[j];
|
||||||
|
}
|
||||||
|
for (var j = 2; j <= iterations; j++) {
|
||||||
|
prf.reset();
|
||||||
|
prf.update(u).finish(u);
|
||||||
|
for (var k = 0; k < len; k++) {
|
||||||
|
t[k] ^= u[k];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
for (var j = 0; j < len && i * len + j < dkLen; j++) {
|
||||||
|
dk[i * len + j] = t[j];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
for (var i = 0; i < len; i++) {
|
||||||
|
t[i] = u[i] = 0;
|
||||||
|
}
|
||||||
|
for (var i = 0; i < 4; i++) {
|
||||||
|
ctr[i] = 0;
|
||||||
|
}
|
||||||
|
prf.clean();
|
||||||
|
return dk;
|
||||||
|
}
|
||||||
|
exports.pbkdf2 = pbkdf2;
|
||||||
|
});
|
||||||
Loading…
Reference in New Issue
Block a user