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https://github.com/tytso/pwgen.git
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78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* sha1num.c --- generate sha1 hash based, pseudo random numbers
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*
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* Copyright (C) 2005 by Olivier Guerrier
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*
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* This file may be distributed under the terms of the GNU Public
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* License.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "pwgen.h"
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#include "sha1.h"
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sha1_context sha1_ctx;
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char *sha1_seed;
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const char *sha1_magic="pwgen";
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unsigned char sha1sum[20];
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int sha1sum_idx=20;
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void pw_sha1_init(char *sha1)
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{
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int i = 0;
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char *seed;
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FILE *f;
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unsigned char buf[1024];
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if ((seed = strchr(sha1,'#'))) {
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*(seed++) = 0;
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sha1_seed = malloc(strlen(seed)+1);
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if (!sha1_seed) {
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fprintf(stderr, "Couldn't malloc sha1_seed buffer.\n");
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exit(1);
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}
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strcpy(sha1_seed, seed);
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}
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else {
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sha1_seed = malloc(strlen(sha1_magic)+1);
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if (!sha1_seed) {
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fprintf(stderr, "Couldn't malloc sha1_seed buffer.\n");
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exit(1);
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}
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strcpy(sha1_seed, sha1_magic);
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}
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if( ! ( f = fopen( sha1, "rb" ) ) ) {
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fprintf(stderr, "Couldn't open file: %s.\n", sha1);
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exit(1);
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}
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sha1_starts( &sha1_ctx );
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while( ( i = fread( buf, 1, sizeof( buf ), f ) ) > 0 ) {
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sha1_update( &sha1_ctx, buf, i );
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}
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fclose(f);
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return;
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}
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int pw_sha1_number(int max_num)
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{
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int val;
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sha1_context ctx;
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if (sha1sum_idx>19) {
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sha1sum_idx = 0;
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sha1_update(&sha1_ctx, (unsigned char *) sha1_seed,
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strlen(sha1_seed));
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ctx = sha1_ctx;
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sha1_finish(&ctx, sha1sum );
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}
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val = (int) (sha1sum[sha1sum_idx++] / ((float) 256) * max_num);
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return (val);
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}
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