90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
var hashjs = require('hash.js');
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var sha512 = require('sha512');
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var Hash = module.exports;
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Hash.sha256 = function(buf) {
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if (!Buffer.isBuffer(buf))
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throw new Error('sha256 hash must be of a buffer');
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var hash = (new hashjs.sha256()).update(buf).digest();
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return new Buffer(hash);
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};
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Hash.sha256.blocksize = 512;
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Hash.sha256sha256 = function(buf) {
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try {
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return Hash.sha256(Hash.sha256(buf));
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} catch (e) {
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throw new Error('sha256sha256 hash must be of a buffer');
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}
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};
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Hash.ripemd160 = function(buf) {
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if (!Buffer.isBuffer(buf))
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throw new Error('ripemd160 hash must be of a buffer');
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var hash = (new hashjs.ripemd160()).update(buf).digest();
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return new Buffer(hash);
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};
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Hash.sha256ripemd160 = function(buf) {
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try {
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return Hash.ripemd160(Hash.sha256(buf));
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} catch (e) {
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throw new Error('sha256ripemd160 hash must be of a buffer');
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}
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};
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Hash.sha512 = function(buf) {
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if (!Buffer.isBuffer(buf))
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throw new Error('sha512 hash must be of a buffer');
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var hash = sha512(buf);
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return new Buffer(hash);
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};
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Hash.sha512.blocksize = 1024;
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Hash.hmac = function(hashf, data, key) {
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if (!Buffer.isBuffer(data) || !Buffer.isBuffer(key))
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throw new Error('data and key must be buffers');
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//http://en.wikipedia.org/wiki/Hash-based_message_authentication_code
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//http://tools.ietf.org/html/rfc4868#section-2
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if (!hashf.blocksize)
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throw new Error('Blocksize for hash function unknown');
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var blocksize = hashf.blocksize/8;
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if (key.length > blocksize)
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key = hashf(key);
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else if (key < blocksize) {
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var fill = new Buffer(blocksize);
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fill.fill(0);
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key.copy(fill);
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key = fill;
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}
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var o_key = new Buffer(blocksize);
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o_key.fill(0x5c);
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var i_key = new Buffer(blocksize);
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i_key.fill(0x36);
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var o_key_pad = new Buffer(blocksize);
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var i_key_pad = new Buffer(blocksize);
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for (var i = 0; i < blocksize; i++) {
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o_key_pad[i] = o_key[i] ^ key[i];
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i_key_pad[i] = i_key[i] ^ key[i];
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}
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return hashf(Buffer.concat([o_key_pad, hashf(Buffer.concat([i_key_pad, data]))]));
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};
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Hash.sha256hmac = function(data, key) {
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return Hash.hmac(Hash.sha256, data, key);
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};
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Hash.sha512hmac = function(data, key) {
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return Hash.hmac(Hash.sha512, data, key);
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};
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