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[git/git.git] / sha1dc / ubc_check.h
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1/***
2* Copyright 2017 Marc Stevens <marc@marc-stevens.nl>, Dan Shumow <danshu@microsoft.com>
3* Distributed under the MIT Software License.
4* See accompanying file LICENSE.txt or copy at
5* https://opensource.org/licenses/MIT
6***/
7
8/*
9// this file was generated by the 'parse_bitrel' program in the tools section
10// using the data files from directory 'tools/data/3565'
11//
12// sha1_dvs contains a list of SHA-1 Disturbance Vectors (DV) to check
13// dvType, dvK and dvB define the DV: I(K,B) or II(K,B) (see the paper)
14// dm[80] is the expanded message block XOR-difference defined by the DV
15// testt is the step to do the recompression from for collision detection
16// maski and maskb define the bit to check for each DV in the dvmask returned by ubc_check
17//
18// ubc_check takes as input an expanded message block and verifies the unavoidable bitconditions for all listed DVs
19// it returns a dvmask where each bit belonging to a DV is set if all unavoidable bitconditions for that DV have been met
20// thus one needs to do the recompression check for each DV that has its bit set
21*/
22
23#ifndef UBC_CHECK_H
24#define UBC_CHECK_H
25
26#if defined(__cplusplus)
27extern "C" {
28#endif
29
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30#define DVMASKSIZE 1
31typedef struct { int dvType; int dvK; int dvB; int testt; int maski; int maskb; uint32_t dm[80]; } dv_info_t;
32extern dv_info_t sha1_dvs[];
33void ubc_check(const uint32_t W[80], uint32_t dvmask[DVMASKSIZE]);
34
35#define DOSTORESTATE58
36#define DOSTORESTATE65
37
38#define CHECK_DVMASK(_DVMASK) (0 != _DVMASK[0])
39
40#if defined(__cplusplus)
41}
42#endif
43
44#endif /* UBC_CHECK_H */