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Simplify webcrypto type conversion

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Previously we'd get a WordArray and convert to string before converting
to array buffer. Instead, go directly to array buffer.
This commit is contained in:
lilia 2014-11-09 20:03:08 -08:00
parent e190582d9e
commit 1ad898a62e
3 changed files with 23 additions and 10 deletions
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15
build/webcrypto.js
View file

@ -32,7 +32,7 @@
return CryptoJS.HmacSHA256(
CryptoJS.enc.Latin1.parse(getString(input)),
CryptoJS.enc.Latin1.parse(getString(key))
).toString(CryptoJS.enc.Latin1);
);
};
function encryptAESCBC(plaintext, key, iv) {
@ -43,7 +43,7 @@
CryptoJS.enc.Latin1.parse(getString(plaintext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
).ciphertext.toString(CryptoJS.enc.Latin1);
).ciphertext;
};
function decryptAESCBC(ciphertext, key, iv) {
@ -54,7 +54,7 @@
btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
).toString(CryptoJS.enc.Latin1);
);
};
// utility function for connecting front and back ends via promises
@ -63,7 +63,14 @@
var args = Array.prototype.slice.call(arguments);
args.shift();
return new Promise(function(resolve) {
resolve(toArrayBuffer(implementation.apply(this, args)));
var wordArray = implementation.apply(this, args);
// convert 32bit WordArray to array buffer
var buffer = new ArrayBuffer(wordArray.sigBytes);
var view = new DataView(buffer);
for(var i = 0; i*4 < buffer.byteLength; i++) {
view.setInt32(i*4, wordArray.words[i]);
}
resolve(buffer);
});
};

3
js/helpers.js
View file

@ -117,8 +117,7 @@ function getStringable(thing) {
(thing === Object(thing) &&
(thing.__proto__ == StaticArrayBufferProto ||
thing.__proto__ == StaticUint8ArrayProto ||
thing.__proto__ == StaticByteBufferProto ||
thing.__proto__ == StaticWordArrayProto)));
thing.__proto__ == StaticByteBufferProto)));
}
function isEqual(a, b, mayBeShort) {

15
js/webcrypto.js
View file

@ -2578,7 +2578,7 @@ CryptoJS.lib.Cipher || (function (undefined) {
return CryptoJS.HmacSHA256(
CryptoJS.enc.Latin1.parse(getString(input)),
CryptoJS.enc.Latin1.parse(getString(key))
).toString(CryptoJS.enc.Latin1);
);
};
function encryptAESCBC(plaintext, key, iv) {
@ -2589,7 +2589,7 @@ CryptoJS.lib.Cipher || (function (undefined) {
CryptoJS.enc.Latin1.parse(getString(plaintext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
).ciphertext.toString(CryptoJS.enc.Latin1);
).ciphertext;
};
function decryptAESCBC(ciphertext, key, iv) {
@ -2600,7 +2600,7 @@ CryptoJS.lib.Cipher || (function (undefined) {
btoa(getString(ciphertext)),
CryptoJS.enc.Latin1.parse(getString(key)),
{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
).toString(CryptoJS.enc.Latin1);
);
};
// utility function for connecting front and back ends via promises
@ -2609,7 +2609,14 @@ CryptoJS.lib.Cipher || (function (undefined) {
var args = Array.prototype.slice.call(arguments);
args.shift();
return new Promise(function(resolve) {
resolve(toArrayBuffer(implementation.apply(this, args)));
var wordArray = implementation.apply(this, args);
// convert 32bit WordArray to array buffer
var buffer = new ArrayBuffer(wordArray.sigBytes);
var view = new DataView(buffer);
for(var i = 0; i*4 < buffer.byteLength; i++) {
view.setInt32(i*4, wordArray.words[i]);
}
resolve(buffer);
});
};