IABSD.fr/src/lib/libcrypto/buffer/buffer.c

Branch : - branch - master - tag -

• Show log

  Commit

• Author : beck
  Date : 2023-07-08 08:26:26
  Hash : ead8f799
  Message : Hide symbols in cms, comp, conf, and buffer ok jsing@

• lib/libcrypto/buffer/buffer.c

• /* $OpenBSD: buffer.c,v 1.28 2023/07/08 08:26:26 beck Exp $ */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <openssl/buffer.h>
  #include <openssl/err.h>
  
  /*
   * LIMIT_BEFORE_EXPANSION is the maximum n such that (n + 3) / 3 * 4 < 2**31.
   * That function is applied in several functions in this file and this limit
   * ensures that the result fits in an int.
   */
  #define LIMIT_BEFORE_EXPANSION 0x5ffffffc
  
  BUF_MEM *
  BUF_MEM_new(void)
  {
  	BUF_MEM *ret;
  
  	if ((ret = calloc(1, sizeof(BUF_MEM))) == NULL) {
  		BUFerror(ERR_R_MALLOC_FAILURE);
  		return (NULL);
  	}
  
  	return (ret);
  }
  LCRYPTO_ALIAS(BUF_MEM_new);
  
  void
  BUF_MEM_free(BUF_MEM *a)
  {
  	if (a == NULL)
  		return;
  
  	freezero(a->data, a->max);
  	free(a);
  }
  LCRYPTO_ALIAS(BUF_MEM_free);
  
  int
  BUF_MEM_grow(BUF_MEM *str, size_t len)
  {
  	return BUF_MEM_grow_clean(str, len);
  }
  LCRYPTO_ALIAS(BUF_MEM_grow);
  
  int
  BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
  {
  	char *ret;
  	size_t n;
  
  	if (str->max >= len) {
  		if (str->length >= len)
  			memset(&str->data[len], 0, str->length - len);
  		str->length = len;
  		return (len);
  	}
  
  	if (len > LIMIT_BEFORE_EXPANSION) {
  		BUFerror(ERR_R_MALLOC_FAILURE);
  		return 0;
  	}
  
  	n = (len + 3) / 3 * 4;
  	if ((ret = recallocarray(str->data, str->max, n, 1)) == NULL) {
  		BUFerror(ERR_R_MALLOC_FAILURE);
  		return (0);
  	}
  	str->data = ret;
  	str->max = n;
  	str->length = len;
  
  	return (len);
  }
  LCRYPTO_ALIAS(BUF_MEM_grow_clean);
  
  void
  BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
  {
  	size_t i;
  
  	if (in) {
  		out += size - 1;
  		for (i = 0; i < size; i++)
  			*out-- = *in++;
  	} else {
  		unsigned char *q;
  		char c;
  		q = out + size - 1;
  		for (i = 0; i < size / 2; i++) {
  			c = *q;
  			*q-- = *out;
  			*out++ = c;
  		}
  	}
  }