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/* * sha1.cpp * * Copyright (C) 1998, 2009 * Paul E. Jones <paulej@packetizer.com> * All Rights Reserved. * ***************************************************************************** * $Id: sha1.cpp 12 2009-06-22 19:34:25Z paulej $ ***************************************************************************** * * Description: * This class implements the Secure Hashing Standard as defined * in FIPS PUB 180-1 published April 17, 1995. * * The Secure Hashing Standard, which uses the Secure Hashing * Algorithm (SHA), produces a 160-bit message digest for a * given data stream. In theory, it is highly improbable that * two messages will produce the same message digest. Therefore, * this algorithm can serve as a means of providing a "fingerprint" * for a message. * * Portability Issues: * SHA-1 is defined in terms of 32-bit "words". This code was * written with the expectation that the processor has at least * a 32-bit machine word size. If the machine word size is larger, * the code should still function properly. One caveat to that * is that the input functions taking characters and character arrays * assume that only 8 bits of information are stored in each character. * * Caveats: * SHA-1 is designed to work with messages less than 2^64 bits long. * Although SHA-1 allows a message digest to be generated for * messages of any number of bits less than 2^64, this implementation * only works with messages with a length that is a multiple of 8 * bits. * */ #include "sha1/sha1.h" /* * SHA1 * * Description: * This is the constructor for the sha1 class. * * Parameters: * None. * * Returns: * Nothing. * * Comments: * */ SHA1::SHA1() { Reset(); } /* * ~SHA1 * * Description: * This is the destructor for the sha1 class * * Parameters: * None. * * Returns: * Nothing. * * Comments: * */ SHA1::~SHA1() { // The destructor does nothing } /* * Reset * * Description: * This function will initialize the sha1 class member variables * in preparation for computing a new message digest. * * Parameters: * None. * * Returns: * Nothing. * * Comments: * */ void SHA1::Reset() { Length_Low = 0; Length_High = 0; Message_Block_Index = 0; H[0] = 0x67452301; H[1] = 0xEFCDAB89; H[2] = 0x98BADCFE; H[3] = 0x10325476; H[4] = 0xC3D2E1F0; Computed = false; Corrupted = false; } /* * Result * * Description: * This function will return the 160-bit message digest into the * array provided. * * Parameters: * message_digest_array: [out] * This is an array of five unsigned integers which will be filled * with the message digest that has been computed. * * Returns: * True if successful, false if it failed. * * Comments: * */ bool SHA1::Result(unsigned *message_digest_array) { int i; // Counter if (Corrupted) { return false; } if (!Computed) { PadMessage(); Computed = true; } for(i = 0; i < 5; i++) { message_digest_array[i] = H[i]; } return true; } /* * Input * * Description: * This function accepts an array of octets as the next portion of * the message. * * Parameters: * message_array: [in] * An array of characters representing the next portion of the * message. * * Returns: * Nothing. * * Comments: * */ void SHA1::Input( const unsigned char *message_array, unsigned length) { if (!length) { return; } if (Computed || Corrupted) { Corrupted = true; return; } while(length-- && !Corrupted) { Message_Block[Message_Block_Index++] = (*message_array & 0xFF); Length_Low += 8; Length_Low &= 0xFFFFFFFF; // Force it to 32 bits if (Length_Low == 0) { Length_High++; Length_High &= 0xFFFFFFFF; // Force it to 32 bits if (Length_High == 0) { Corrupted = true; // Message is too long } } if (Message_Block_Index == 64) { ProcessMessageBlock(); } message_array++; } } /* * Input * * Description: * This function accepts an array of octets as the next portion of * the message. * * Parameters: * message_array: [in] * An array of characters representing the next portion of the * message. * length: [in] * The length of the message_array * * Returns: * Nothing. * * Comments: * */ void SHA1::Input( const char *message_array, unsigned length) { Input((unsigned char *) message_array, length); } /* * Input * * Description: * This function accepts a single octets as the next message element. * * Parameters: * message_element: [in] * The next octet in the message. * * Returns: * Nothing. * * Comments: * */ void SHA1::Input(unsigned char message_element) { Input(&message_element, 1); } /* * Input * * Description: * This function accepts a single octet as the next message element. * * Parameters: * message_element: [in] * The next octet in the message. * * Returns: * Nothing. * * Comments: * */ void SHA1::Input(char message_element) { Input((unsigned char *) &message_element, 1); } /* * operator<< * * Description: * This operator makes it convenient to provide character strings to * the SHA1 object for processing. * * Parameters: * message_array: [in] * The character array to take as input. * * Returns: * A reference to the SHA1 object. * * Comments: * Each character is assumed to hold 8 bits of information. * */ SHA1& SHA1::operator<<(const char *message_array) { const char *p = message_array; while(*p) { Input(*p); p++; } return *this; } /* * operator<< * * Description: * This operator makes it convenient to provide character strings to * the SHA1 object for processing. * * Parameters: * message_array: [in] * The character array to take as input. * * Returns: * A reference to the SHA1 object. * * Comments: * Each character is assumed to hold 8 bits of information. * */ SHA1& SHA1::operator<<(const unsigned char *message_array) { const unsigned char *p = message_array; while(*p) { Input(*p); p++; } return *this; } /* * operator<< * * Description: * This function provides the next octet in the message. * * Parameters: * message_element: [in] * The next octet in the message * * Returns: * A reference to the SHA1 object. * * Comments: * The character is assumed to hold 8 bits of information. * */ SHA1& SHA1::operator<<(const char message_element) { Input((unsigned char *) &message_element, 1); return *this; } /* * operator<< * * Description: * This function provides the next octet in the message. * * Parameters: * message_element: [in] * The next octet in the message * * Returns