Sha256: a64a607dcb642323a9fcd9e7ab3fe189bce6f1a658352fd6fcba84af997f7ee8
Contents?: true
Size: 1017 Bytes
Versions: 65
Compression:
Stored size: 1017 Bytes
Contents
var createHash = require('./create-hash')
var zeroBuffer = new Buffer(128)
zeroBuffer.fill(0)
module.exports = Hmac
function Hmac (alg, key) {
if(!(this instanceof Hmac)) return new Hmac(alg, key)
this._opad = opad
this._alg = alg
var blocksize = (alg === 'sha512') ? 128 : 64
key = this._key = !Buffer.isBuffer(key) ? new Buffer(key) : key
if(key.length > blocksize) {
key = createHash(alg).update(key).digest()
} else if(key.length < blocksize) {
key = Buffer.concat([key, zeroBuffer], blocksize)
}
var ipad = this._ipad = new Buffer(blocksize)
var opad = this._opad = new Buffer(blocksize)
for(var i = 0; i < blocksize; i++) {
ipad[i] = key[i] ^ 0x36
opad[i] = key[i] ^ 0x5C
}
this._hash = createHash(alg).update(ipad)
}
Hmac.prototype.update = function (data, enc) {
this._hash.update(data, enc)
return this
}
Hmac.prototype.digest = function (enc) {
var h = this._hash.digest()
return createHash(this._alg).update(this._opad).update(h).digest(enc)
}
Version data entries
65 entries across 65 versions & 2 rubygems