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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
// A very thin wrapper around nsICryptoHash. It's not strictly
// necessary, but makes the code a bit cleaner and gives us the
// opportunity to verify that our implementations give the results that
// we expect, for example if we have to interoperate with a server.
//
// The digest* methods reset the state of the hasher, so it's
// necessary to call init() explicitly after them.
//
// Works only in Firefox 1.5+.
//
// IMPORTANT NOTE: Due to https://bugzilla.mozilla.org/show_bug.cgi?id=321024
// you cannot use the cryptohasher before app-startup. The symptom of doing
// so is a segfault in NSS.
/**
* Instantiate a new hasher. You must explicitly call init() before use!
*/
this.G_CryptoHasher =
function G_CryptoHasher() {
this.debugZone = "cryptohasher";
this.hasher_ = null;
}
G_CryptoHasher.algorithms = {
MD2: Ci.nsICryptoHash.MD2,
MD5: Ci.nsICryptoHash.MD5,
SHA1: Ci.nsICryptoHash.SHA1,
SHA256: Ci.nsICryptoHash.SHA256,
SHA384: Ci.nsICryptoHash.SHA384,
SHA512: Ci.nsICryptoHash.SHA512,
};
/**
* Initialize the hasher. This function must be called after every call
* to one of the digest* methods.
*
* @param algorithm Constant from G_CryptoHasher.algorithms specifying the
* algorithm this hasher will use
*/
G_CryptoHasher.prototype.init = function(algorithm) {
var validAlgorithm = false;
for (var alg in G_CryptoHasher.algorithms)
if (algorithm == G_CryptoHasher.algorithms[alg])
validAlgorithm = true;
if (!validAlgorithm)
throw new Error("Invalid algorithm: " + algorithm);
this.hasher_ = Cc["@mozilla.org/security/hash;1"]
.createInstance(Ci.nsICryptoHash);
this.hasher_.init(algorithm);
}
/**
* Update the hash's internal state with input given in a string. Can be
* called multiple times for incrementeal hash updates.
*
* @param input String containing data to hash.
*/
G_CryptoHasher.prototype.updateFromString = function(input) {
if (!this.hasher_)
throw new Error("You must initialize the hasher first!");
var stream = Cc['@mozilla.org/io/string-input-stream;1']
.createInstance(Ci.nsIStringInputStream);
stream.setData(input, input.length);
this.updateFromStream(stream);
}
/**
* Update the hash's internal state with input given in an array. Can be
* called multiple times for incremental hash updates.
*
* @param input Array containing data to hash.
*/
G_CryptoHasher.prototype.updateFromArray = function(input) {
if (!this.hasher_)
throw new Error("You must initialize the hasher first!");
this.hasher_.update(input, input.length);
}
/**
* Update the hash's internal state with input given in a stream. Can be
* called multiple times from incremental hash updates.
*/
G_CryptoHasher.prototype.updateFromStream = function(stream) {
if (!this.hasher_)
throw new Error("You must initialize the hasher first!");
if (stream.available())
this.hasher_.updateFromStream(stream, stream.available());
}
/**
* @returns The hash value as a string (sequence of 8-bit values)
*/
G_CryptoHasher.prototype.digestRaw = function() {
var digest = this.hasher_.finish(false /* not b64 encoded */);
this.hasher_ = null;
return digest;
}
/**
* @returns The hash value as a base64-encoded string
*/
G_CryptoHasher.prototype.digestBase64 = function() {
var digest = this.hasher_.finish(true /* b64 encoded */);
this.hasher_ = null;
return digest;
}
/**
* @returns The hash value as a hex-encoded string
*/
G_CryptoHasher.prototype.digestHex = function() {
var raw = this.digestRaw();
return this.toHex_(raw);
}
/**
* Converts a sequence of values to a hex-encoded string. The input is a
* a string, so you can stick 16-bit values in each character.
*
* @param str String to conver to hex. (Often this is just a sequence of
* 16-bit values)
*
* @returns String containing the hex representation of the input
*/
G_CryptoHasher.prototype.toHex_ = function(str) {
var hexchars = '0123456789ABCDEF';
var hexrep = new Array(str.length * 2);
for (var i = 0; i < str.length; ++i) {
hexrep[i * 2] = hexchars.charAt((str.charCodeAt(i) >> 4) & 15);
hexrep[i * 2 + 1] = hexchars.charAt(str.charCodeAt(i) & 15);
}
return hexrep.join('');
}
#ifdef DEBUG
/**
* Lame unittest function
*/
this.TEST_G_CryptoHasher = function TEST_G_CryptoHasher() {
if (G_GDEBUG) {
var z = "cryptohasher UNITTEST";
G_debugService.enableZone(z);
G_Debug(z, "Starting");
var md5 = function(str) {
var hasher = new G_CryptoHasher();
hasher.init(G_CryptoHasher.algorithms.MD5);
hasher.updateFromString(str);
return hasher.digestHex().toLowerCase();
};
// test vectors from: http://www.faqs.org/rfcs/rfc1321.html
var vectors = {"": "d41d8cd98f00b204e9800998ecf8427e",
"a": "0cc175b9c0f1b6a831c399e269772661",
"abc": "900150983cd24fb0d6963f7d28e17f72",
"message digest": "f96b697d7cb7938d525a2f31aaf161d0",
"abcdefghijklmnopqrstuvwxyz": "c3fcd3d76192e4007dfb496cca67e13b",
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789": "d174ab98d277d9f5a5611c2c9f419d9f",
"12345678901234567890123456789012345678901234567890123456789012345678901234567890": "57edf4a22be3c955ac49da2e2107b67a"};
G_Debug(z, "PASSED");
}
}
#endif
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