/* sha1.c : Implementation of the Secure Hash Algorithm *//* SHA: NIST's Secure Hash Algorithm *//*	This version written November 2000 by David Ireland of 	DI Management Services Pty Limited <code@di-mgt.com.au>	Adapted from code in the Python Cryptography Toolkit, 	version 1.0.0 by A.M. Kuchling 1995.*//* AM Kuchling's posting:-    Based on SHA code originally posted to sci.crypt by Peter Gutmann   in message <30ajo5$oe8@ccu2.auckland.ac.nz>.   Modified to test for endianness on creation of SHA objects by AMK.   Also, the original specification of SHA was found to have a weakness   by NSA/NIST.  This code implements the fixed version of SHA.*//* Here's the first paragraph of Peter Gutmann's posting:   The following is my SHA (FIPS 180) code updated to allow use of the "fixed"SHA, thanks to Jim Gillogly and an anonymous contributor for the information onwhat's changed in the new version.  The fix is a simple change which involvesadding a single rotate in the initial expansion function.  It is unknownwhether this is an optimal solution to the problem which was discovered in theSHA or whether it's simply a bandaid which fixes the problem with a minimum ofeffort (for example the reengineering of a great many Capstone chips).*/#include <stdio.h>#include <string.h>#include "tsk3/libtsk.h"#define SHA_HASH_LENGTH 	20#define SHA_BUFSIZ 1024char *crunch(fp)  FILE *fp;{    unsigned char sum[SHA_HASH_LENGTH];    unsigned char buf[SHA_BUFSIZ];    static char result[2 * SHA_HASH_LENGTH + 1];    static char hex[] = "0123456789abcdef";    TSK_SHA_CTX sha;    int i;    int buflen;    TSK_SHA_Init(&sha);    while ((buflen = fread(buf, 1, SHA_BUFSIZ, fp)) > 0)        TSK_SHA_Update(&sha, buf, buflen);    TSK_SHA_Final(sum, &sha);    for (i = 0; i < SHA_HASH_LENGTH; i++) {        result[2 * i] = hex[(sum[i] >> 4) & 0xf];        result[2 * i + 1] = hex[sum[i] & 0xf];    }    return (result);}intmain(argc, argv)  int argc;  char **argv;{    char *myname = argv[0];    char *crunch();    FILE *fp;    if (argc < 2) {        printf("%s\n", crunch(stdin));    }    else {        while (--argc && *++argv) {            if ((fp = fopen(*argv, "r")) == 0) {                fprintf(stderr, "%s: ", myname);                perror(*argv);                return (1);            }            printf("%s  %s\n", crunch(fp), *argv);            fclose(fp);        }    }    return (0);}