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author | Aki <please@ignore.pl> | 2021-10-01 23:46:47 +0200 |
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committer | Aki <please@ignore.pl> | 2021-10-01 23:46:47 +0200 |
commit | ddd76aa4e1571c8d5965709db5c3cd47a89c9a38 (patch) | |
tree | 4e07bfaebede6531a70984fdebc855bca52f394a /nGenEx/Sha1.cpp | |
parent | 3a507e08b1d4e5970b27401a7e6517570d529400 (diff) | |
parent | c2d2c3551501110fddd78674d5435bfaa70382a3 (diff) | |
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Diffstat (limited to 'nGenEx/Sha1.cpp')
-rw-r--r-- | nGenEx/Sha1.cpp | 589 |
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diff --git a/nGenEx/Sha1.cpp b/nGenEx/Sha1.cpp deleted file mode 100644 index 7bbfd77..0000000 --- a/nGenEx/Sha1.cpp +++ /dev/null @@ -1,589 +0,0 @@ -/* -* 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::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: -* 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); - - return *this; -} - -/* -* 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 - }; - 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 - */ - for(t = 0; t < 16; t++) - { - W[t] = Message_Block[t * 4] << 24; - W[t] |= Message_Block[t * 4 + 1] << 16; - W[t] |= Message_Block[t * 4 + 2] << 8; - W[t] |= Message_Block[t * 4 + 3]; - } - - for(t = 16; t < 80; t++) - { - W[t] = CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); - } - - A = H[0]; - B = H[1]; - C = H[2]; - D = H[3]; - E = H[4]; - - for(t = 0; t < 20; t++) - { - temp = CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 20; t < 40; t++) - { - temp = CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 40; t < 60; t++) - { - temp = CircularShift(5,A) + - ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 60; t < 80; t++) - { - temp = CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - H[0] = (H[0] + A) & 0xFFFFFFFF; - H[1] = (H[1] + B) & 0xFFFFFFFF; - H[2] = (H[2] + C) & 0xFFFFFFFF; - H[3] = (H[3] + D) & 0xFFFFFFFF; - H[4] = (H[4] + E) & 0xFFFFFFFF; - - Message_Block_Index = 0; -} - -/* -* 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. - */ - if (Message_Block_Index > 55) - { - Message_Block[Message_Block_Index++] = 0x80; - while(Message_Block_Index < 64) - { - Message_Block[Message_Block_Index++] = 0; - } - - ProcessMessageBlock(); - - while(Message_Block_Index < 56) - { - Message_Block[Message_Block_Index++] = 0; - } - } - else - { - Message_Block[Message_Block_Index++] = 0x80; - while(Message_Block_Index < 56) - { - Message_Block[Message_Block_Index++] = 0; - } - - } - - /* - * 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; - Message_Block[59] = (Length_High) & 0xFF; - Message_Block[60] = (Length_Low >> 24) & 0xFF; - Message_Block[61] = (Length_Low >> 16) & 0xFF; - Message_Block[62] = (Length_Low >> 8) & 0xFF; - Message_Block[63] = (Length_Low) & 0xFF; - - ProcessMessageBlock(); -} - - -/* -* 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)); -} |