diff options
Diffstat (limited to 'nGenEx/Sha1.cpp')
| -rw-r--r-- | nGenEx/Sha1.cpp | 602 |
1 files changed, 301 insertions, 301 deletions
diff --git a/nGenEx/Sha1.cpp b/nGenEx/Sha1.cpp index bc27c56..37cc45f 100644 --- a/nGenEx/Sha1.cpp +++ b/nGenEx/Sha1.cpp @@ -1,101 +1,101 @@ /* - * Sha1.cpp - * - * Copyright (C) 1998 - * Paul E. Jones <paulej@acm.org> - * All Rights Reserved. - * - ***************************************************************************** - * $Id: sha1.cpp,v 1.6 2001/03/20 06:54:54 paulej Exp $ - ***************************************************************************** - * - * 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. - * - */ +* Sha1.cpp +* +* Copyright (C) 1998 +* Paul E. Jones <paulej@acm.org> +* All Rights Reserved. +* +***************************************************************************** +* $Id: sha1.cpp,v 1.6 2001/03/20 06:54:54 paulej Exp $ +***************************************************************************** +* +* 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.h" /* - * SHA1 - * - * Description: - * This is the constructor for the sha1 class. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ +* 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 +* +* 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: - * - */ +* 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; @@ -113,23 +113,23 @@ void SHA1::Reset() } /* - * 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: - * - */ +* 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 @@ -154,25 +154,25 @@ bool SHA1::Result(unsigned *message_digest_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. - * - * Returns: - * Nothing. - * - * Comments: - * - */ +* 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) +unsigned length) { if (!length) { @@ -211,91 +211,91 @@ void SHA1::Input( const unsigned char *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: - * - */ +* 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) +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: - * - */ +* 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: - * - */ +* 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. - * - */ +* 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; @@ -310,23 +310,23 @@ SHA1& SHA1::operator<<(const char *message_array) } /* - * 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. - * - */ +* 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; @@ -341,22 +341,22 @@ SHA1& SHA1::operator<<(const unsigned char *message_array) } /* - * 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. - * - */ +* 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); @@ -365,22 +365,22 @@ SHA1& SHA1::operator<<(const char message_element) } /* - * 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. - * - */ +* 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 unsigned char message_element) { Input(&message_element, 1); @@ -389,40 +389,40 @@ SHA1& SHA1::operator<<(const unsigned char message_element) } /* - * ProcessMessageBlock - * - * Description: - * This function will process the next 512 bits of the message - * stored in the Message_Block array. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * Many of the variable names in this function, especially the single - * character names, were used because those were the names used - * in the publication. - * - */ +* ProcessMessageBlock +* +* Description: +* This function will process the next 512 bits of the message +* stored in the Message_Block array. +* +* Parameters: +* None. +* +* Returns: +* Nothing. +* +* Comments: +* Many of the variable names in this function, especially the single +* character names, were used because those were the names used +* in the publication. +* +*/ void SHA1::ProcessMessageBlock() { const unsigned K[] = { // Constants defined for SHA-1 - 0x5A827999, - 0x6ED9EBA1, - 0x8F1BBCDC, - 0xCA62C1D6 - }; + 0x5A827999, + 0x6ED9EBA1, + 0x8F1BBCDC, + 0xCA62C1D6 + }; int t; // Loop counter unsigned temp; // Temporary word value unsigned W[80]; // Word sequence unsigned A, B, C, D, E; // Word buffers /* - * Initialize the first 16 words in the array W - */ + * Initialize the first 16 words in the array W + */ for(t = 0; t < 16; t++) { W[t] = Message_Block[t * 4] << 24; @@ -433,7 +433,7 @@ void SHA1::ProcessMessageBlock() for(t = 16; t < 80; t++) { - W[t] = CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); + W[t] = CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); } A = H[0]; @@ -467,7 +467,7 @@ void SHA1::ProcessMessageBlock() for(t = 40; t < 60; t++) { temp = CircularShift(5,A) + - ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; temp &= 0xFFFFFFFF; E = D; D = C; @@ -497,33 +497,33 @@ void SHA1::ProcessMessageBlock() } /* - * PadMessage - * - * Description: - * According to the standard, the message must be padded to an even - * 512 bits. The first padding bit must be a '1'. The last 64 bits - * represent the length of the original message. All bits in between - * should be 0. This function will pad the message according to those - * rules by filling the message_block array accordingly. It will also - * call ProcessMessageBlock() appropriately. When it returns, it - * can be assumed that the message digest has been computed. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ +* PadMessage +* +* Description: +* According to the standard, the message must be padded to an even +* 512 bits. The first padding bit must be a '1'. The last 64 bits +* represent the length of the original message. All bits in between +* should be 0. This function will pad the message according to those +* rules by filling the message_block array accordingly. It will also +* call ProcessMessageBlock() appropriately. When it returns, it +* can be assumed that the message digest has been computed. +* +* Parameters: +* None. +* +* Returns: +* Nothing. +* +* Comments: +* +*/ void SHA1::PadMessage() { /* - * Check to see if the current message block is too small to hold - * the initial padding bits and length. If so, we will pad the - * block, process it, and then continue padding into a second block. - */ + * Check to see if the current message block is too small to hold + * the initial padding bits and length. If so, we will pad the + * block, process it, and then continue padding into a second block. + */ if (Message_Block_Index > 55) { Message_Block[Message_Block_Index++] = 0x80; @@ -550,8 +550,8 @@ void SHA1::PadMessage() } /* - * Store the message length as the last 8 octets - */ + * Store the message length as the last 8 octets + */ Message_Block[56] = (Length_High >> 24) & 0xFF; Message_Block[57] = (Length_High >> 16) & 0xFF; Message_Block[58] = (Length_High >> 8) & 0xFF; @@ -566,23 +566,23 @@ void SHA1::PadMessage() /* - * CircularShift - * - * Description: - * This member function will perform a circular shifting operation. - * - * Parameters: - * bits: [in] - * The number of bits to shift (1-31) - * word: [in] - * The value to shift (assumes a 32-bit integer) - * - * Returns: - * The shifted value. - * - * Comments: - * - */ +* CircularShift +* +* Description: +* This member function will perform a circular shifting operation. +* +* Parameters: +* bits: [in] +* The number of bits to shift (1-31) +* word: [in] +* The value to shift (assumes a 32-bit integer) +* +* Returns: +* The shifted value. +* +* Comments: +* +*/ unsigned SHA1::CircularShift(int bits, unsigned word) { return ((word << bits) & 0xFFFFFFFF) | ((word & 0xFFFFFFFF) >> (32-bits)); |