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372 lines
10 KiB
C
372 lines
10 KiB
C
/*
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* sha1.c
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*
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* Copyright (C) 1998, 2009
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* Paul E. Jones <paulej@packetizer.com>
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* All Rights Reserved
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*
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*****************************************************************************
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* $Id: sha1.c 12 2009-06-22 19:34:25Z paulej $
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*****************************************************************************
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*
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* Description:
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* This file implements the Secure Hashing Standard as defined
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* in FIPS PUB 180-1 published April 17, 1995.
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*
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* The Secure Hashing Standard, which uses the Secure Hashing
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* Algorithm (SHA), produces a 160-bit message digest for a
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* given data stream. In theory, it is highly improbable that
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* two messages will produce the same message digest. Therefore,
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* this algorithm can serve as a means of providing a "fingerprint"
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* for a message.
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*
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* Portability Issues:
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* SHA-1 is defined in terms of 32-bit "words". This code was
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* written with the expectation that the processor has at least
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* a 32-bit machine word size. If the machine word size is larger,
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* the code should still function properly. One caveat to that
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* is that the input functions taking characters and character
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* arrays assume that only 8 bits of information are stored in each
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* character.
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*
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* Caveats:
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* SHA-1 is designed to work with messages less than 2^64 bits
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* long. Although SHA-1 allows a message digest to be generated for
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* messages of any number of bits less than 2^64, this
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* implementation only works with messages with a length that is a
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* multiple of the size of an 8-bit character.
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*
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*/
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#include "sha1.h"
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/*
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* Define the circular shift macro
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*/
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#define SHA1CircularShift(bits,word) \
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((((word) << (bits)) & 0xFFFFFFFF) | \
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((word) >> (32-(bits))))
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/* Function prototypes */
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void SHA1ProcessMessageBlock(SHA1Context *);
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void SHA1PadMessage(SHA1Context *);
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/*
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* SHA1Reset
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*
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* Description:
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* This function will initialize the SHA1Context in preparation
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* for computing a new message digest.
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*
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* Parameters:
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* context: [in/out]
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* The context to reset.
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*
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* Returns:
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* Nothing.
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*
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* Comments:
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*
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*/
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void SHA1Reset(SHA1Context *context)
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{
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context->Length_Low = 0;
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context->Length_High = 0;
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context->Message_Block_Index = 0;
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context->Message_Digest[0] = 0x67452301;
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context->Message_Digest[1] = 0xEFCDAB89;
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context->Message_Digest[2] = 0x98BADCFE;
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context->Message_Digest[3] = 0x10325476;
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context->Message_Digest[4] = 0xC3D2E1F0;
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context->Computed = 0;
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context->Corrupted = 0;
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}
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/*
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* SHA1Result
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*
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* Description:
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* This function will return the 160-bit message digest into the
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* Message_Digest array within the SHA1Context provided
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*
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* Parameters:
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* context: [in/out]
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* The context to use to calculate the SHA-1 hash.
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*
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* Returns:
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* 1 if successful, 0 if it failed.
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*
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* Comments:
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*
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*/
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int SHA1Result(SHA1Context *context)
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{
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if (context->Corrupted)
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{
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return 0;
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}
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if (!context->Computed)
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{
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SHA1PadMessage(context);
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context->Computed = 1;
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}
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return 1;
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}
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/*
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* SHA1Input
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*
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* Description:
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* This function accepts an array of octets as the next portion of
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* the message.
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*
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* Parameters:
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* context: [in/out]
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* The SHA-1 context to update
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* message_array: [in]
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* An array of characters representing the next portion of the
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* message.
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* length: [in]
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* The length of the message in message_array
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*
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* Returns:
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* Nothing.
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*
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* Comments:
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*
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*/
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void SHA1Input( SHA1Context *context,
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const unsigned char *message_array,
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unsigned length)
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{
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if (!length)
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{
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return;
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}
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if (context->Computed || context->Corrupted)
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{
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context->Corrupted = 1;
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return;
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}
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while(length-- && !context->Corrupted)
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{
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context->Message_Block[context->Message_Block_Index++] =
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(*message_array & 0xFF);
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context->Length_Low += 8;
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/* Force it to 32 bits */
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context->Length_Low &= 0xFFFFFFFF;
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if (context->Length_Low == 0)
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{
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context->Length_High++;
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/* Force it to 32 bits */
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context->Length_High &= 0xFFFFFFFF;
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if (context->Length_High == 0)
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{
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/* Message is too long */
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context->Corrupted = 1;
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}
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}
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if (context->Message_Block_Index == 64)
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{
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SHA1ProcessMessageBlock(context);
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}
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message_array++;
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}
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}
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/*
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* SHA1ProcessMessageBlock
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*
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* Description:
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* This function will process the next 512 bits of the message
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* stored in the Message_Block array.
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*
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* Parameters:
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* None.
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*
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* Returns:
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* Nothing.
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*
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* Comments:
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* Many of the variable names in the SHAContext, especially the
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* single character names, were used because those were the names
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* used in the publication.
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*
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*
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*/
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void SHA1ProcessMessageBlock(SHA1Context *context)
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{
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const unsigned K[] = /* Constants defined in SHA-1 */
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{
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0x5A827999,
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0x6ED9EBA1,
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0x8F1BBCDC,
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0xCA62C1D6
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};
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int t; /* Loop counter */
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unsigned temp; /* Temporary word value */
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unsigned W[80]; /* Word sequence */
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unsigned A, B, C, D, E; /* Word buffers */
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/*
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* Initialize the first 16 words in the array W
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*/
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for(t = 0; t < 16; t++)
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{
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W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;
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W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;
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W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;
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W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]);
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}
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for(t = 16; t < 80; t++)
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{
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W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
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}
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A = context->Message_Digest[0];
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B = context->Message_Digest[1];
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C = context->Message_Digest[2];
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D = context->Message_Digest[3];
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E = context->Message_Digest[4];
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for(t = 0; t < 20; t++)
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{
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temp = SHA1CircularShift(5,A) +
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((B & C) | ((~B) & D)) + E + W[t] + K[0];
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temp &= 0xFFFFFFFF;
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E = D;
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D = C;
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C = SHA1CircularShift(30,B);
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B = A;
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A = temp;
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}
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for(t = 20; t < 40; t++)
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{
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temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
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temp &= 0xFFFFFFFF;
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E = D;
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D = C;
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C = SHA1CircularShift(30,B);
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B = A;
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A = temp;
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}
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for(t = 40; t < 60; t++)
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{
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temp = SHA1CircularShift(5,A) +
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((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
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temp &= 0xFFFFFFFF;
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E = D;
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D = C;
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C = SHA1CircularShift(30,B);
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B = A;
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A = temp;
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}
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for(t = 60; t < 80; t++)
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{
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temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
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temp &= 0xFFFFFFFF;
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E = D;
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D = C;
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C = SHA1CircularShift(30,B);
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B = A;
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A = temp;
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}
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context->Message_Digest[0] =
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(context->Message_Digest[0] + A) & 0xFFFFFFFF;
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context->Message_Digest[1] =
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(context->Message_Digest[1] + B) & 0xFFFFFFFF;
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context->Message_Digest[2] =
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(context->Message_Digest[2] + C) & 0xFFFFFFFF;
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context->Message_Digest[3] =
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(context->Message_Digest[3] + D) & 0xFFFFFFFF;
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context->Message_Digest[4] =
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(context->Message_Digest[4] + E) & 0xFFFFFFFF;
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context->Message_Block_Index = 0;
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}
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/*
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* SHA1PadMessage
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*
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* Description:
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* According to the standard, the message must be padded to an even
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* 512 bits. The first padding bit must be a '1'. The last 64
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* bits represent the length of the original message. All bits in
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* between should be 0. This function will pad the message
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* according to those rules by filling the Message_Block array
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* accordingly. It will also call SHA1ProcessMessageBlock()
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* appropriately. When it returns, it can be assumed that the
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* message digest has been computed.
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*
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* Parameters:
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* context: [in/out]
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* The context to pad
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*
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* Returns:
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* Nothing.
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*
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* Comments:
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*
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*/
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void SHA1PadMessage(SHA1Context *context)
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{
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/*
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* Check to see if the current message block is too small to hold
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* the initial padding bits and length. If so, we will pad the
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* block, process it, and then continue padding into a second
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* block.
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*/
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if (context->Message_Block_Index > 55)
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{
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context->Message_Block[context->Message_Block_Index++] = 0x80;
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while(context->Message_Block_Index < 64)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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SHA1ProcessMessageBlock(context);
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while(context->Message_Block_Index < 56)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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}
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else
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{
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context->Message_Block[context->Message_Block_Index++] = 0x80;
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while(context->Message_Block_Index < 56)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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}
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/*
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* Store the message length as the last 8 octets
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*/
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context->Message_Block[56] = (context->Length_High >> 24) & 0xFF;
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context->Message_Block[57] = (context->Length_High >> 16) & 0xFF;
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context->Message_Block[58] = (context->Length_High >> 8) & 0xFF;
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context->Message_Block[59] = (context->Length_High) & 0xFF;
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context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF;
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context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF;
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context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF;
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context->Message_Block[63] = (context->Length_Low) & 0xFF;
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SHA1ProcessMessageBlock(context);
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}
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