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46 lines
969 B
46 lines
969 B
'use strict' |
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var inherits = require('inherits') |
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var Buffer = require('safe-buffer').Buffer |
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var Base = require('cipher-base') |
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var ZEROS = Buffer.alloc(128) |
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var blocksize = 64 |
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function Hmac (alg, key) { |
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Base.call(this, 'digest') |
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if (typeof key === 'string') { |
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key = Buffer.from(key) |
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} |
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this._alg = alg |
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this._key = key |
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if (key.length > blocksize) { |
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key = alg(key) |
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} else if (key.length < blocksize) { |
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key = Buffer.concat([key, ZEROS], blocksize) |
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} |
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var ipad = this._ipad = Buffer.allocUnsafe(blocksize) |
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var opad = this._opad = Buffer.allocUnsafe(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 = [ipad] |
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} |
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inherits(Hmac, Base) |
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Hmac.prototype._update = function (data) { |
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this._hash.push(data) |
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} |
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Hmac.prototype._final = function () { |
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var h = this._alg(Buffer.concat(this._hash)) |
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return this._alg(Buffer.concat([this._opad, h])) |
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} |
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module.exports = Hmac
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