/base/000_base/bower_components/cryptojslib/components/hmac.js |
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/* |
CryptoJS v3.1.2 |
code.google.com/p/crypto-js |
(c) 2009-2013 by Jeff Mott. All rights reserved. |
code.google.com/p/crypto-js/wiki/License |
*/ |
(function () { |
// Shortcuts |
var C = CryptoJS; |
var C_lib = C.lib; |
var Base = C_lib.Base; |
var C_enc = C.enc; |
var Utf8 = C_enc.Utf8; |
var C_algo = C.algo; |
|
/** |
* HMAC algorithm. |
*/ |
var HMAC = C_algo.HMAC = Base.extend({ |
/** |
* Initializes a newly created HMAC. |
* |
* @param {Hasher} hasher The hash algorithm to use. |
* @param {WordArray|string} key The secret key. |
* |
* @example |
* |
* var hmacHasher = CryptoJS.algo.HMAC.create(CryptoJS.algo.SHA256, key); |
*/ |
init: function (hasher, key) { |
// Init hasher |
hasher = this._hasher = new hasher.init(); |
|
// Convert string to WordArray, else assume WordArray already |
if (typeof key == 'string') { |
key = Utf8.parse(key); |
} |
|
// Shortcuts |
var hasherBlockSize = hasher.blockSize; |
var hasherBlockSizeBytes = hasherBlockSize * 4; |
|
// Allow arbitrary length keys |
if (key.sigBytes > hasherBlockSizeBytes) { |
key = hasher.finalize(key); |
} |
|
// Clamp excess bits |
key.clamp(); |
|
// Clone key for inner and outer pads |
var oKey = this._oKey = key.clone(); |
var iKey = this._iKey = key.clone(); |
|
// Shortcuts |
var oKeyWords = oKey.words; |
var iKeyWords = iKey.words; |
|
// XOR keys with pad constants |
for (var i = 0; i < hasherBlockSize; i++) { |
oKeyWords[i] ^= 0x5c5c5c5c; |
iKeyWords[i] ^= 0x36363636; |
} |
oKey.sigBytes = iKey.sigBytes = hasherBlockSizeBytes; |
|
// Set initial values |
this.reset(); |
}, |
|
/** |
* Resets this HMAC to its initial state. |
* |
* @example |
* |
* hmacHasher.reset(); |
*/ |
reset: function () { |
// Shortcut |
var hasher = this._hasher; |
|
// Reset |
hasher.reset(); |
hasher.update(this._iKey); |
}, |
|
/** |
* Updates this HMAC with a message. |
* |
* @param {WordArray|string} messageUpdate The message to append. |
* |
* @return {HMAC} This HMAC instance. |
* |
* @example |
* |
* hmacHasher.update('message'); |
* hmacHasher.update(wordArray); |
*/ |
update: function (messageUpdate) { |
this._hasher.update(messageUpdate); |
|
// Chainable |
return this; |
}, |
|
/** |
* Finalizes the HMAC computation. |
* Note that the finalize operation is effectively a destructive, read-once operation. |
* |
* @param {WordArray|string} messageUpdate (Optional) A final message update. |
* |
* @return {WordArray} The HMAC. |
* |
* @example |
* |
* var hmac = hmacHasher.finalize(); |
* var hmac = hmacHasher.finalize('message'); |
* var hmac = hmacHasher.finalize(wordArray); |
*/ |
finalize: function (messageUpdate) { |
// Shortcut |
var hasher = this._hasher; |
|
// Compute HMAC |
var innerHash = hasher.finalize(messageUpdate); |
hasher.reset(); |
var hmac = hasher.finalize(this._oKey.clone().concat(innerHash)); |
|
return hmac; |
} |
}); |
}()); |