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Dedupe methods

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Define textsecure.crypto in terms of libsignal.crypto.

// FREEBIE
This commit is contained in:
lilia
2016-05-07 17:49:45 -07:00
parent 58452066aa
commit f8e176fd40
9 changed files with 35 additions and 107 deletions
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46
libtextsecure/crypto.js
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@@ -5,44 +5,10 @@
;(function(){
'use strict';
// Various wrappers around low-level crypto operation for specific functions
var encrypt = function(key, data, iv) {
return window.crypto.subtle.importKey('raw', key, {name: 'AES-CBC'}, false, ['encrypt']).then(function(key) {
return window.crypto.subtle.encrypt({name: 'AES-CBC', iv: new Uint8Array(iv)}, key, data);
});
};
var decrypt = function(key, data, iv) {
return window.crypto.subtle.importKey('raw', key, {name: 'AES-CBC'}, false, ['decrypt']).then(function(key) {
return window.crypto.subtle.decrypt({name: 'AES-CBC', iv: new Uint8Array(iv)}, key, data);
});
};
var calculateMAC = function(key, data) {
return window.crypto.subtle.importKey('raw', key, {name: 'HMAC', hash: {name: 'SHA-256'}}, false, ['sign']).then(function(key) {
return window.crypto.subtle.sign( {name: 'HMAC', hash: 'SHA-256'}, key, data);
});
};
var verifyMAC = function(data, key, mac, length) {
return calculateMAC(key, data).then(function(calculated_mac) {
if (mac.byteLength != length || calculated_mac.byteLength < length) {
throw new Error("Bad MAC length");
}
var a = new Uint8Array(calculated_mac);
var b = new Uint8Array(mac);
var result = 0;
for (var i=0; i < mac.byteLength; ++i) {
result = result | (a[i] ^ b[i]);
}
if (result !== 0) {
throw new Error("Bad MAC");
}
});
};
var encrypt = libsignal.crypto.encrypt;
var decrypt = libsignal.crypto.decrypt;
var calculateMAC = libsignal.crypto.calculateMAC;
var verifyMAC = libsignal.crypto.verifyMAC;
window.textsecure = window.textsecure || {};
window.textsecure.crypto = {
@@ -119,9 +85,7 @@
},
getRandomBytes: function(size) {
var array = new Uint8Array(size);
window.crypto.getRandomValues(array);
return array.buffer;
return libsignal.crypto.getRandomBytes(size);
}
};
})();