sha1.c File Reference
#include "sha1.h"
Detailed Description
sha1.c
Copyright (C) 1998 Paul E. Jones <paulej@arid.us> All Rights Reserved
- Id
- sha1.c 196 2009-11-12 01:03:54Z julian
Description: This file 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 the size of an 8-bit character. author Paul E. Jones
Define Documentation
| #define SHA1CircularShift |
( |
bits, |
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word |
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) |
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Value:((((word) << (bits)) & 0xFFFFFFFF) | \
((word) >> (32-(bits))))
Function Documentation
| void SHA1Input |
( |
SHA1Context * |
context, |
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const unsigned char * |
message_array, |
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unsigned |
length | |
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) |
| | |
