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comparison Resources/sha1/sha1.h @ 177:81b6f3013738

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sha1
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 09 Nov 2012 10:42:00 +0100
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176:81f11fb357f2 177:81b6f3013738
1 /*
2 * sha1.h
3 *
4 * Copyright (C) 1998, 2009
5 * Paul E. Jones <paulej@packetizer.com>
6 * All Rights Reserved.
7 *
8 *****************************************************************************
9 * $Id: sha1.h 12 2009-06-22 19:34:25Z paulej $
10 *****************************************************************************
11 *
12 * Description:
13 * This class implements the Secure Hashing Standard as defined
14 * in FIPS PUB 180-1 published April 17, 1995.
15 *
16 * Many of the variable names in this class, especially the single
17 * character names, were used because those were the names used
18 * in the publication.
19 *
20 * Please read the file sha1.cpp for more information.
21 *
22 */
23
24 #ifndef _SHA1_H_
25 #define _SHA1_H_
26
27 class SHA1
28 {
29
30 public:
31
32 SHA1();
33 virtual ~SHA1();
34
35 /*
36 * Re-initialize the class
37 */
38 void Reset();
39
40 /*
41 * Returns the message digest
42 */
43 bool Result(unsigned *message_digest_array);
44
45 /*
46 * Provide input to SHA1
47 */
48 void Input( const unsigned char *message_array,
49 unsigned length);
50 void Input( const char *message_array,
51 unsigned length);
52 void Input(unsigned char message_element);
53 void Input(char message_element);
54 SHA1& operator<<(const char *message_array);
55 SHA1& operator<<(const unsigned char *message_array);
56 SHA1& operator<<(const char message_element);
57 SHA1& operator<<(const unsigned char message_element);
58
59 private:
60
61 /*
62 * Process the next 512 bits of the message
63 */
64 void ProcessMessageBlock();
65
66 /*
67 * Pads the current message block to 512 bits
68 */
69 void PadMessage();
70
71 /*
72 * Performs a circular left shift operation
73 */
74 inline unsigned CircularShift(int bits, unsigned word);
75
76 unsigned H[5]; // Message digest buffers
77
78 unsigned Length_Low; // Message length in bits
79 unsigned Length_High; // Message length in bits
80
81 unsigned char Message_Block[64]; // 512-bit message blocks
82 int Message_Block_Index; // Index into message block array
83
84 bool Computed; // Is the digest computed?
85 bool Corrupted; // Is the message digest corruped?
86
87 };
88
89 #endif