54 lines
1.3 KiB
JavaScript
54 lines
1.3 KiB
JavaScript
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'use strict';
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// See: https://github.com/dominictarr/hmac
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//
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// The only difference between this and the original is this uses Uint8Array instead of Buffer
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// @TODO: Use the hmac in hash.js instead
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var convert = require('./convert.js');
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var zeroBuffer = new Uint8Array(128)
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function Hmac (createHash, blocksize, key) {
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if(!(this instanceof Hmac)) { throw new Error('missing new'); }
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this._opad = opad
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this._createHash = createHash
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if(blocksize !== 128 && blocksize !== 64) {
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throw new Error('blocksize must be either 64 for or 128 , but was:' + blocksize);
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}
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key = this._key = convert.arrayify(key);
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if(key.length > blocksize) {
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key = this._createHash().update(key).digest()
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} else if(key.length < blocksize) {
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key = convert.concat([key, zeroBuffer], blocksize)
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}
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var ipad = this._ipad = new Uint8Array(blocksize)
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var opad = this._opad = new Uint8Array(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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this._hash = this._createHash().update(ipad)
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}
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Hmac.prototype.update = function (data, enc) {
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this._hash.update(data, enc)
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return this;
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}
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Hmac.prototype.digest = function (enc) {
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var h = this._hash.digest()
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return this._createHash().update(this._opad).update(h).digest(enc)
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}
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module.exports = Hmac
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