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98 lines
2.5 KiB
98 lines
2.5 KiB
var Buffer = require('buffer').Buffer;
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var sha = require('./sha');
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var sha256 = require('./sha256');
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var md5 = require('./md5');
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var algorithms = {
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sha1: sha,
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sha256: sha256,
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md5: md5
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};
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var blocksize = 64;
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var zeroBuffer = Buffer.alloc(blocksize);
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zeroBuffer.fill(0);
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function hmac(fn, key, data) {
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if (!Buffer.isBuffer(key)) key = Buffer.from(key);
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if (!Buffer.isBuffer(data)) data = Buffer.from(data);
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if (key.length > blocksize) {
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key = fn(key);
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} else if (key.length < blocksize) {
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key = Buffer.concat([key, zeroBuffer], blocksize);
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}
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var ipad = Buffer.alloc(blocksize),
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opad = Buffer.alloc(blocksize);
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for (var i = 0; i < blocksize; i++) {
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ipad[i] = key[i] ^ 0x36;
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opad[i] = key[i] ^ 0x5c;
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}
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var hash = fn(Buffer.concat([ipad, data]));
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return fn(Buffer.concat([opad, hash]));
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}
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function hash(alg, key) {
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alg = alg || 'sha1';
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var fn = algorithms[alg];
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var bufs = [];
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var length = 0;
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if (!fn) error('algorithm:', alg, 'is not yet supported');
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return {
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update: function (data) {
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if (!Buffer.isBuffer(data)) data = Buffer.from(data);
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bufs.push(data);
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length += data.length;
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return this;
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},
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digest: function (enc) {
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var buf = Buffer.concat(bufs);
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var r = key ? hmac(fn, key, buf) : fn(buf);
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bufs = null;
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return enc ? r.toString(enc) : r;
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}
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};
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}
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function error() {
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var m = [].slice.call(arguments).join(' ');
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throw new Error([m, 'we accept pull requests', 'http://github.com/dominictarr/crypto-browserify'].join('\n'));
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}
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exports.createHash = function (alg) {
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return hash(alg);
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};
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exports.createHmac = function (alg, key) {
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return hash(alg, key);
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};
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exports.createCredentials = () => {
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error('sorry,createCredentials is not implemented yet');
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};
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exports.createCipher = () => {
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error('sorry,createCipher is not implemented yet');
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};
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exports.createCipheriv = () => {
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error('sorry,createCipheriv is not implemented yet');
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};
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exports.createDecipher = () => {
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error('sorry,createDecipher is not implemented yet');
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};
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exports.createDecipheriv = () => {
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error('sorry,createDecipheriv is not implemented yet');
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};
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exports.createSign = () => {
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error('sorry,createSign is not implemented yet');
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};
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exports.createVerify = () => {
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error('sorry,createVerify is not implemented yet');
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};
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exports.createDiffieHellman = () => {
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error('sorry,createDiffieHellman is not implemented yet');
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};
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exports.pbkdf2 = () => {
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error('sorry,pbkdf2 is not implemented yet');
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};
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