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