thodg/acme-client/base64.c

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• Hash : a1ac5fc5
  Author : Thomas de Grivel
  Date : 2025-09-13T20:19:29
  

  make Makefile portable and fix build using libbsd
  

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• base64.c

• /*	$Id: base64.c,v 1.9 2017/01/24 13:32:55 jsing Exp $ */
  /*
   * Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
   *
   * 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 AUTHORS DISCLAIM ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 <netinet/in.h>
  #include <resolv.h>
  
  #include <stdlib.h>
  
  #include "extern.h"
  
  /*
   * Compute the maximum buffer required for a base64 encoded string of
   * length "len".
   */
  size_t
  base64len(size_t len)
  {
  
  	return (len + 2) / 3 * 4 + 1;
  }
  
  /*
   * Pass a stream of bytes to be base64 encoded, then converted into
   * base64url format.
   * Returns NULL on allocation failure (not logged).
   */
  char *
  base64buf_url(const char *data, size_t len)
  {
  	size_t	 i, sz;
  	char	*buf;
  
  	sz = base64len(len);
  	if ((buf = malloc(sz)) == NULL)
  		return NULL;
  
  	b64_ntop((unsigned char *) data, len, buf, sz);
  
  	for (i = 0; i < sz; i++)
  		switch (buf[i]) {
  		case '+':
  			buf[i] = '-';
  			break;
  		case '/':
  			buf[i] = '_';
  			break;
  		case '=':
  			buf[i] = '\0';
  			break;
  		}
  
  	return buf;
  }
  

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