mfbt/SHA1.h@97036ab72558
mfbt/SHA1.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 /* Simple class for computing SHA1. */
9 #ifndef mozilla_SHA1_h
10 #define mozilla_SHA1_h
12 #include "mozilla/Types.h"
14 #include <stddef.h>
15 #include <stdint.h>
17 namespace mozilla {
19 /**
20 * This class computes the SHA1 hash of a byte sequence, or of the concatenation
21 * of multiple sequences. For example, computing the SHA1 of two sequences of
22 * bytes could be done as follows:
23 *
24 * void SHA1(const uint8_t* buf1, uint32_t size1,
25 * const uint8_t* buf2, uint32_t size2,
26 * SHA1Sum::Hash& hash)
27 * {
28 * SHA1Sum s;
29 * s.update(buf1, size1);
30 * s.update(buf2, size2);
31 * s.finish(hash);
32 * }
33 *
34 * The finish method may only be called once and cannot be followed by calls
35 * to update.
36 */
37 class SHA1Sum
38 {
39 union {
40 uint32_t w[16]; /* input buffer */
41 uint8_t b[64];
42 } u;
43 uint64_t size; /* count of hashed bytes. */
44 unsigned H[22]; /* 5 state variables, 16 tmp values, 1 extra */
45 bool mDone;
47 public:
48 MFBT_API SHA1Sum();
50 static const size_t HashSize = 20;
51 typedef uint8_t Hash[HashSize];
53 /* Add len bytes of dataIn to the data sequence being hashed. */
54 MFBT_API void update(const void* dataIn, uint32_t len);
56 /* Compute the final hash of all data into hashOut. */
57 MFBT_API void finish(SHA1Sum::Hash& hashOut);
58 };
60 } /* namespace mozilla */
62 #endif /* mozilla_SHA1_h */
