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561 lines
17 KiB
561 lines
17 KiB
/** |
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* Secure Hash Algorithm with a 1024-bit block size implementation. |
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* |
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* This includes: SHA-512, SHA-384, SHA-512/224, and SHA-512/256. For |
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* SHA-256 (block size 512 bits), see sha256.js. |
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* |
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* See FIPS 180-4 for details. |
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* |
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* @author Dave Longley |
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* |
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* Copyright (c) 2014-2015 Digital Bazaar, Inc. |
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*/ |
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var forge = require('./forge'); |
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require('./md'); |
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require('./util'); |
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|
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var sha512 = module.exports = forge.sha512 = forge.sha512 || {}; |
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|
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// SHA-512 |
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forge.md.sha512 = forge.md.algorithms.sha512 = sha512; |
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|
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// SHA-384 |
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var sha384 = forge.sha384 = forge.sha512.sha384 = forge.sha512.sha384 || {}; |
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sha384.create = function() { |
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return sha512.create('SHA-384'); |
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}; |
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forge.md.sha384 = forge.md.algorithms.sha384 = sha384; |
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|
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// SHA-512/256 |
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forge.sha512.sha256 = forge.sha512.sha256 || { |
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create: function() { |
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return sha512.create('SHA-512/256'); |
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} |
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}; |
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forge.md['sha512/256'] = forge.md.algorithms['sha512/256'] = |
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forge.sha512.sha256; |
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|
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// SHA-512/224 |
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forge.sha512.sha224 = forge.sha512.sha224 || { |
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create: function() { |
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return sha512.create('SHA-512/224'); |
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} |
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}; |
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forge.md['sha512/224'] = forge.md.algorithms['sha512/224'] = |
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forge.sha512.sha224; |
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|
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/** |
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* Creates a SHA-2 message digest object. |
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* |
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* @param algorithm the algorithm to use (SHA-512, SHA-384, SHA-512/224, |
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* SHA-512/256). |
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* |
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* @return a message digest object. |
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*/ |
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sha512.create = function(algorithm) { |
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// do initialization as necessary |
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if(!_initialized) { |
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_init(); |
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} |
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|
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if(typeof algorithm === 'undefined') { |
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algorithm = 'SHA-512'; |
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} |
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|
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if(!(algorithm in _states)) { |
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throw new Error('Invalid SHA-512 algorithm: ' + algorithm); |
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} |
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|
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// SHA-512 state contains eight 64-bit integers (each as two 32-bit ints) |
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var _state = _states[algorithm]; |
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var _h = null; |
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|
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// input buffer |
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var _input = forge.util.createBuffer(); |
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|
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// used for 64-bit word storage |
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var _w = new Array(80); |
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for(var wi = 0; wi < 80; ++wi) { |
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_w[wi] = new Array(2); |
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} |
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|
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// determine digest length by algorithm name (default) |
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var digestLength = 64; |
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switch(algorithm) { |
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case 'SHA-384': |
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digestLength = 48; |
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break; |
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case 'SHA-512/256': |
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digestLength = 32; |
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break; |
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case 'SHA-512/224': |
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digestLength = 28; |
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break; |
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} |
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|
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// message digest object |
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var md = { |
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// SHA-512 => sha512 |
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algorithm: algorithm.replace('-', '').toLowerCase(), |
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blockLength: 128, |
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digestLength: digestLength, |
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// 56-bit length of message so far (does not including padding) |
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messageLength: 0, |
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// true message length |
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fullMessageLength: null, |
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// size of message length in bytes |
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messageLengthSize: 16 |
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}; |
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|
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/** |
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* Starts the digest. |
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* |
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* @return this digest object. |
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*/ |
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md.start = function() { |
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// up to 56-bit message length for convenience |
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md.messageLength = 0; |
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|
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// full message length (set md.messageLength128 for backwards-compatibility) |
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md.fullMessageLength = md.messageLength128 = []; |
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var int32s = md.messageLengthSize / 4; |
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for(var i = 0; i < int32s; ++i) { |
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md.fullMessageLength.push(0); |
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} |
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_input = forge.util.createBuffer(); |
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_h = new Array(_state.length); |
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for(var i = 0; i < _state.length; ++i) { |
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_h[i] = _state[i].slice(0); |
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} |
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return md; |
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}; |
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// start digest automatically for first time |
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md.start(); |
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|
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/** |
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* Updates the digest with the given message input. The given input can |
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* treated as raw input (no encoding will be applied) or an encoding of |
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* 'utf8' maybe given to encode the input using UTF-8. |
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* |
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* @param msg the message input to update with. |
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* @param encoding the encoding to use (default: 'raw', other: 'utf8'). |
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* |
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* @return this digest object. |
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*/ |
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md.update = function(msg, encoding) { |
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if(encoding === 'utf8') { |
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msg = forge.util.encodeUtf8(msg); |
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} |
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|
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// update message length |
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var len = msg.length; |
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md.messageLength += len; |
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len = [(len / 0x100000000) >>> 0, len >>> 0]; |
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for(var i = md.fullMessageLength.length - 1; i >= 0; --i) { |
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md.fullMessageLength[i] += len[1]; |
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len[1] = len[0] + ((md.fullMessageLength[i] / 0x100000000) >>> 0); |
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md.fullMessageLength[i] = md.fullMessageLength[i] >>> 0; |
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len[0] = ((len[1] / 0x100000000) >>> 0); |
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} |
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// add bytes to input buffer |
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_input.putBytes(msg); |
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|
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// process bytes |
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_update(_h, _w, _input); |
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|
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// compact input buffer every 2K or if empty |
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if(_input.read > 2048 || _input.length() === 0) { |
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_input.compact(); |
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} |
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return md; |
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}; |
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/** |
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* Produces the digest. |
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* |
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* @return a byte buffer containing the digest value. |
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*/ |
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md.digest = function() { |
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/* Note: Here we copy the remaining bytes in the input buffer and |
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add the appropriate SHA-512 padding. Then we do the final update |
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on a copy of the state so that if the user wants to get |
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intermediate digests they can do so. */ |
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|
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/* Determine the number of bytes that must be added to the message |
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to ensure its length is congruent to 896 mod 1024. In other words, |
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the data to be digested must be a multiple of 1024 bits (or 128 bytes). |
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This data includes the message, some padding, and the length of the |
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message. Since the length of the message will be encoded as 16 bytes (128 |
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bits), that means that the last segment of the data must have 112 bytes |
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(896 bits) of message and padding. Therefore, the length of the message |
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plus the padding must be congruent to 896 mod 1024 because |
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1024 - 128 = 896. |
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In order to fill up the message length it must be filled with |
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padding that begins with 1 bit followed by all 0 bits. Padding |
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must *always* be present, so if the message length is already |
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congruent to 896 mod 1024, then 1024 padding bits must be added. */ |
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var finalBlock = forge.util.createBuffer(); |
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finalBlock.putBytes(_input.bytes()); |
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|
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// compute remaining size to be digested (include message length size) |
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var remaining = ( |
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md.fullMessageLength[md.fullMessageLength.length - 1] + |
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md.messageLengthSize); |
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// add padding for overflow blockSize - overflow |
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// _padding starts with 1 byte with first bit is set (byte value 128), then |
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// there may be up to (blockSize - 1) other pad bytes |
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var overflow = remaining & (md.blockLength - 1); |
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finalBlock.putBytes(_padding.substr(0, md.blockLength - overflow)); |
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|
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// serialize message length in bits in big-endian order; since length |
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// is stored in bytes we multiply by 8 and add carry from next int |
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var next, carry; |
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var bits = md.fullMessageLength[0] * 8; |
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for(var i = 0; i < md.fullMessageLength.length - 1; ++i) { |
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next = md.fullMessageLength[i + 1] * 8; |
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carry = (next / 0x100000000) >>> 0; |
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bits += carry; |
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finalBlock.putInt32(bits >>> 0); |
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bits = next >>> 0; |
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} |
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finalBlock.putInt32(bits); |
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var h = new Array(_h.length); |
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for(var i = 0; i < _h.length; ++i) { |
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h[i] = _h[i].slice(0); |
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} |
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_update(h, _w, finalBlock); |
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var rval = forge.util.createBuffer(); |
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var hlen; |
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if(algorithm === 'SHA-512') { |
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hlen = h.length; |
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} else if(algorithm === 'SHA-384') { |
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hlen = h.length - 2; |
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} else { |
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hlen = h.length - 4; |
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} |
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for(var i = 0; i < hlen; ++i) { |
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rval.putInt32(h[i][0]); |
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if(i !== hlen - 1 || algorithm !== 'SHA-512/224') { |
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rval.putInt32(h[i][1]); |
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} |
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} |
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return rval; |
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}; |
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return md; |
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}; |
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// sha-512 padding bytes not initialized yet |
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var _padding = null; |
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var _initialized = false; |
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|
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// table of constants |
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var _k = null; |
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|
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// initial hash states |
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var _states = null; |
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/** |
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* Initializes the constant tables. |
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*/ |
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function _init() { |
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// create padding |
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_padding = String.fromCharCode(128); |
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_padding += forge.util.fillString(String.fromCharCode(0x00), 128); |
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|
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// create K table for SHA-512 |
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_k = [ |
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[0x428a2f98, 0xd728ae22], [0x71374491, 0x23ef65cd], |
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[0xb5c0fbcf, 0xec4d3b2f], [0xe9b5dba5, 0x8189dbbc], |
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[0x3956c25b, 0xf348b538], [0x59f111f1, 0xb605d019], |
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[0x923f82a4, 0xaf194f9b], [0xab1c5ed5, 0xda6d8118], |
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[0xd807aa98, 0xa3030242], [0x12835b01, 0x45706fbe], |
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[0x243185be, 0x4ee4b28c], [0x550c7dc3, 0xd5ffb4e2], |
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[0x72be5d74, 0xf27b896f], [0x80deb1fe, 0x3b1696b1], |
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[0x9bdc06a7, 0x25c71235], [0xc19bf174, 0xcf692694], |
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[0xe49b69c1, 0x9ef14ad2], [0xefbe4786, 0x384f25e3], |
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[0x0fc19dc6, 0x8b8cd5b5], [0x240ca1cc, 0x77ac9c65], |
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[0x2de92c6f, 0x592b0275], [0x4a7484aa, 0x6ea6e483], |
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[0x5cb0a9dc, 0xbd41fbd4], [0x76f988da, 0x831153b5], |
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[0x983e5152, 0xee66dfab], [0xa831c66d, 0x2db43210], |
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[0xb00327c8, 0x98fb213f], [0xbf597fc7, 0xbeef0ee4], |
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[0xc6e00bf3, 0x3da88fc2], [0xd5a79147, 0x930aa725], |
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[0x06ca6351, 0xe003826f], [0x14292967, 0x0a0e6e70], |
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[0x27b70a85, 0x46d22ffc], [0x2e1b2138, 0x5c26c926], |
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[0x4d2c6dfc, 0x5ac42aed], [0x53380d13, 0x9d95b3df], |
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[0x650a7354, 0x8baf63de], [0x766a0abb, 0x3c77b2a8], |
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[0x81c2c92e, 0x47edaee6], [0x92722c85, 0x1482353b], |
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[0xa2bfe8a1, 0x4cf10364], [0xa81a664b, 0xbc423001], |
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[0xc24b8b70, 0xd0f89791], [0xc76c51a3, 0x0654be30], |
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[0xd192e819, 0xd6ef5218], [0xd6990624, 0x5565a910], |
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[0xf40e3585, 0x5771202a], [0x106aa070, 0x32bbd1b8], |
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[0x19a4c116, 0xb8d2d0c8], [0x1e376c08, 0x5141ab53], |
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[0x2748774c, 0xdf8eeb99], [0x34b0bcb5, 0xe19b48a8], |
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[0x391c0cb3, 0xc5c95a63], [0x4ed8aa4a, 0xe3418acb], |
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[0x5b9cca4f, 0x7763e373], [0x682e6ff3, 0xd6b2b8a3], |
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[0x748f82ee, 0x5defb2fc], [0x78a5636f, 0x43172f60], |
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[0x84c87814, 0xa1f0ab72], [0x8cc70208, 0x1a6439ec], |
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[0x90befffa, 0x23631e28], [0xa4506ceb, 0xde82bde9], |
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[0xbef9a3f7, 0xb2c67915], [0xc67178f2, 0xe372532b], |
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[0xca273ece, 0xea26619c], [0xd186b8c7, 0x21c0c207], |
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[0xeada7dd6, 0xcde0eb1e], [0xf57d4f7f, 0xee6ed178], |
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[0x06f067aa, 0x72176fba], [0x0a637dc5, 0xa2c898a6], |
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[0x113f9804, 0xbef90dae], [0x1b710b35, 0x131c471b], |
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[0x28db77f5, 0x23047d84], [0x32caab7b, 0x40c72493], |
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[0x3c9ebe0a, 0x15c9bebc], [0x431d67c4, 0x9c100d4c], |
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[0x4cc5d4be, 0xcb3e42b6], [0x597f299c, 0xfc657e2a], |
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[0x5fcb6fab, 0x3ad6faec], [0x6c44198c, 0x4a475817] |
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]; |
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|
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// initial hash states |
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_states = {}; |
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_states['SHA-512'] = [ |
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[0x6a09e667, 0xf3bcc908], |
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[0xbb67ae85, 0x84caa73b], |
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[0x3c6ef372, 0xfe94f82b], |
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[0xa54ff53a, 0x5f1d36f1], |
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[0x510e527f, 0xade682d1], |
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[0x9b05688c, 0x2b3e6c1f], |
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[0x1f83d9ab, 0xfb41bd6b], |
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[0x5be0cd19, 0x137e2179] |
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]; |
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_states['SHA-384'] = [ |
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[0xcbbb9d5d, 0xc1059ed8], |
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[0x629a292a, 0x367cd507], |
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[0x9159015a, 0x3070dd17], |
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[0x152fecd8, 0xf70e5939], |
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[0x67332667, 0xffc00b31], |
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[0x8eb44a87, 0x68581511], |
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[0xdb0c2e0d, 0x64f98fa7], |
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[0x47b5481d, 0xbefa4fa4] |
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]; |
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_states['SHA-512/256'] = [ |
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[0x22312194, 0xFC2BF72C], |
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[0x9F555FA3, 0xC84C64C2], |
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[0x2393B86B, 0x6F53B151], |
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[0x96387719, 0x5940EABD], |
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[0x96283EE2, 0xA88EFFE3], |
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[0xBE5E1E25, 0x53863992], |
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[0x2B0199FC, 0x2C85B8AA], |
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[0x0EB72DDC, 0x81C52CA2] |
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]; |
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_states['SHA-512/224'] = [ |
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[0x8C3D37C8, 0x19544DA2], |
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[0x73E19966, 0x89DCD4D6], |
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[0x1DFAB7AE, 0x32FF9C82], |
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[0x679DD514, 0x582F9FCF], |
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[0x0F6D2B69, 0x7BD44DA8], |
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[0x77E36F73, 0x04C48942], |
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[0x3F9D85A8, 0x6A1D36C8], |
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[0x1112E6AD, 0x91D692A1] |
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]; |
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// now initialized |
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_initialized = true; |
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} |
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|
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/** |
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* Updates a SHA-512 state with the given byte buffer. |
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* |
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* @param s the SHA-512 state to update. |
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* @param w the array to use to store words. |
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* @param bytes the byte buffer to update with. |
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*/ |
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function _update(s, w, bytes) { |
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// consume 512 bit (128 byte) chunks |
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var t1_hi, t1_lo; |
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var t2_hi, t2_lo; |
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var s0_hi, s0_lo; |
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var s1_hi, s1_lo; |
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var ch_hi, ch_lo; |
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var maj_hi, maj_lo; |
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var a_hi, a_lo; |
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var b_hi, b_lo; |
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var c_hi, c_lo; |
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var d_hi, d_lo; |
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var e_hi, e_lo; |
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var f_hi, f_lo; |
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var g_hi, g_lo; |
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var h_hi, h_lo; |
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var i, hi, lo, w2, w7, w15, w16; |
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var len = bytes.length(); |
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while(len >= 128) { |
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// the w array will be populated with sixteen 64-bit big-endian words |
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// and then extended into 64 64-bit words according to SHA-512 |
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for(i = 0; i < 16; ++i) { |
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w[i][0] = bytes.getInt32() >>> 0; |
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w[i][1] = bytes.getInt32() >>> 0; |
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} |
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for(; i < 80; ++i) { |
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// for word 2 words ago: ROTR 19(x) ^ ROTR 61(x) ^ SHR 6(x) |
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w2 = w[i - 2]; |
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hi = w2[0]; |
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lo = w2[1]; |
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|
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// high bits |
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t1_hi = ( |
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((hi >>> 19) | (lo << 13)) ^ // ROTR 19 |
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((lo >>> 29) | (hi << 3)) ^ // ROTR 61/(swap + ROTR 29) |
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(hi >>> 6)) >>> 0; // SHR 6 |
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// low bits |
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t1_lo = ( |
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((hi << 13) | (lo >>> 19)) ^ // ROTR 19 |
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((lo << 3) | (hi >>> 29)) ^ // ROTR 61/(swap + ROTR 29) |
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((hi << 26) | (lo >>> 6))) >>> 0; // SHR 6 |
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|
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// for word 15 words ago: ROTR 1(x) ^ ROTR 8(x) ^ SHR 7(x) |
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w15 = w[i - 15]; |
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hi = w15[0]; |
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lo = w15[1]; |
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|
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// high bits |
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t2_hi = ( |
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((hi >>> 1) | (lo << 31)) ^ // ROTR 1 |
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((hi >>> 8) | (lo << 24)) ^ // ROTR 8 |
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(hi >>> 7)) >>> 0; // SHR 7 |
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// low bits |
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t2_lo = ( |
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((hi << 31) | (lo >>> 1)) ^ // ROTR 1 |
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((hi << 24) | (lo >>> 8)) ^ // ROTR 8 |
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((hi << 25) | (lo >>> 7))) >>> 0; // SHR 7 |
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|
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// sum(t1, word 7 ago, t2, word 16 ago) modulo 2^64 (carry lo overflow) |
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w7 = w[i - 7]; |
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w16 = w[i - 16]; |
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lo = (t1_lo + w7[1] + t2_lo + w16[1]); |
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w[i][0] = (t1_hi + w7[0] + t2_hi + w16[0] + |
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((lo / 0x100000000) >>> 0)) >>> 0; |
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w[i][1] = lo >>> 0; |
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} |
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|
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// initialize hash value for this chunk |
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a_hi = s[0][0]; |
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a_lo = s[0][1]; |
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b_hi = s[1][0]; |
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b_lo = s[1][1]; |
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c_hi = s[2][0]; |
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c_lo = s[2][1]; |
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d_hi = s[3][0]; |
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d_lo = s[3][1]; |
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e_hi = s[4][0]; |
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e_lo = s[4][1]; |
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f_hi = s[5][0]; |
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f_lo = s[5][1]; |
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g_hi = s[6][0]; |
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g_lo = s[6][1]; |
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h_hi = s[7][0]; |
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h_lo = s[7][1]; |
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|
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// round function |
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for(i = 0; i < 80; ++i) { |
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// Sum1(e) = ROTR 14(e) ^ ROTR 18(e) ^ ROTR 41(e) |
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s1_hi = ( |
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((e_hi >>> 14) | (e_lo << 18)) ^ // ROTR 14 |
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((e_hi >>> 18) | (e_lo << 14)) ^ // ROTR 18 |
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((e_lo >>> 9) | (e_hi << 23))) >>> 0; // ROTR 41/(swap + ROTR 9) |
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s1_lo = ( |
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((e_hi << 18) | (e_lo >>> 14)) ^ // ROTR 14 |
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((e_hi << 14) | (e_lo >>> 18)) ^ // ROTR 18 |
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((e_lo << 23) | (e_hi >>> 9))) >>> 0; // ROTR 41/(swap + ROTR 9) |
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|
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// Ch(e, f, g) (optimized the same way as SHA-1) |
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ch_hi = (g_hi ^ (e_hi & (f_hi ^ g_hi))) >>> 0; |
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ch_lo = (g_lo ^ (e_lo & (f_lo ^ g_lo))) >>> 0; |
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|
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// Sum0(a) = ROTR 28(a) ^ ROTR 34(a) ^ ROTR 39(a) |
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s0_hi = ( |
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((a_hi >>> 28) | (a_lo << 4)) ^ // ROTR 28 |
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((a_lo >>> 2) | (a_hi << 30)) ^ // ROTR 34/(swap + ROTR 2) |
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((a_lo >>> 7) | (a_hi << 25))) >>> 0; // ROTR 39/(swap + ROTR 7) |
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s0_lo = ( |
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((a_hi << 4) | (a_lo >>> 28)) ^ // ROTR 28 |
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((a_lo << 30) | (a_hi >>> 2)) ^ // ROTR 34/(swap + ROTR 2) |
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((a_lo << 25) | (a_hi >>> 7))) >>> 0; // ROTR 39/(swap + ROTR 7) |
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|
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// Maj(a, b, c) (optimized the same way as SHA-1) |
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maj_hi = ((a_hi & b_hi) | (c_hi & (a_hi ^ b_hi))) >>> 0; |
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maj_lo = ((a_lo & b_lo) | (c_lo & (a_lo ^ b_lo))) >>> 0; |
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|
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// main algorithm |
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// t1 = (h + s1 + ch + _k[i] + _w[i]) modulo 2^64 (carry lo overflow) |
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lo = (h_lo + s1_lo + ch_lo + _k[i][1] + w[i][1]); |
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t1_hi = (h_hi + s1_hi + ch_hi + _k[i][0] + w[i][0] + |
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((lo / 0x100000000) >>> 0)) >>> 0; |
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t1_lo = lo >>> 0; |
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|
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// t2 = s0 + maj modulo 2^64 (carry lo overflow) |
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lo = s0_lo + maj_lo; |
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t2_hi = (s0_hi + maj_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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t2_lo = lo >>> 0; |
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|
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h_hi = g_hi; |
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h_lo = g_lo; |
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|
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g_hi = f_hi; |
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g_lo = f_lo; |
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|
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f_hi = e_hi; |
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f_lo = e_lo; |
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|
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// e = (d + t1) modulo 2^64 (carry lo overflow) |
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lo = d_lo + t1_lo; |
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e_hi = (d_hi + t1_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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e_lo = lo >>> 0; |
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|
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d_hi = c_hi; |
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d_lo = c_lo; |
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|
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c_hi = b_hi; |
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c_lo = b_lo; |
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|
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b_hi = a_hi; |
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b_lo = a_lo; |
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|
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// a = (t1 + t2) modulo 2^64 (carry lo overflow) |
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lo = t1_lo + t2_lo; |
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a_hi = (t1_hi + t2_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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a_lo = lo >>> 0; |
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} |
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|
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// update hash state (additional modulo 2^64) |
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lo = s[0][1] + a_lo; |
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s[0][0] = (s[0][0] + a_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[0][1] = lo >>> 0; |
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|
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lo = s[1][1] + b_lo; |
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s[1][0] = (s[1][0] + b_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[1][1] = lo >>> 0; |
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|
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lo = s[2][1] + c_lo; |
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s[2][0] = (s[2][0] + c_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[2][1] = lo >>> 0; |
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|
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lo = s[3][1] + d_lo; |
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s[3][0] = (s[3][0] + d_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[3][1] = lo >>> 0; |
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|
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lo = s[4][1] + e_lo; |
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s[4][0] = (s[4][0] + e_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[4][1] = lo >>> 0; |
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|
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lo = s[5][1] + f_lo; |
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s[5][0] = (s[5][0] + f_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[5][1] = lo >>> 0; |
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|
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lo = s[6][1] + g_lo; |
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s[6][0] = (s[6][0] + g_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[6][1] = lo >>> 0; |
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|
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lo = s[7][1] + h_lo; |
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s[7][0] = (s[7][0] + h_hi + ((lo / 0x100000000) >>> 0)) >>> 0; |
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s[7][1] = lo >>> 0; |
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|
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len -= 128; |
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} |
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}
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|
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