thodg/got/lib/sha1.c

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• Show log

  Commit

• Author : Stefan Sperling
  Date : 2018-03-17 17:50:48
  Hash : 718b3ab0
  Message : rename the library-internal headers again to a common prefix

• lib/sha1.c

• /*
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sha1.h>
  #include <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <limits.h>
  
  #include "got_lib_sha1.h"
  
  static int
  parse_xdigit(uint8_t *val, const char *hex)
  {
  	char *ep;
  	long lval;
  
  	errno = 0;
  	lval = strtol(hex, &ep, 16);
  	if (hex[0] == '\0' || *ep != '\0')
  		return 0;
  	if (errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN))
  		return 0;
  
  	*val = (uint8_t)lval;
  	return 1;
  }
  
  int
  got_parse_sha1_digest(uint8_t *digest, const char *line)
  {
  	uint8_t b = 0;
  	char hex[3] = {'\0', '\0', '\0'};
  	int i, j;
  
  	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
  		if (line[0] == '\0' || line[1] == '\0')
  			return 0;
  		for (j = 0; j < 2; j++) {
  			hex[j] = *line;
  			line++;
  		}
  		if (!parse_xdigit(&b, hex))
  			return 0;
  		digest[i] = b;
  	}
  
  	return 1;
  }
  
  char *
  got_sha1_digest_to_str(const uint8_t *digest, char *buf, size_t size)
  {
  	char *p = buf;
  	char hex[3];
  	int i;
  
  	if (size < SHA1_DIGEST_STRING_LENGTH)
  		return NULL;
  
  	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
  		snprintf(hex, sizeof(hex), "%.2x", digest[i]);
  		p[0] = hex[0];
  		p[1] = hex[1];
  		p += 2;
  	}
  	p[0] = '\0';
  
  	return buf;
  }