155714Skris/* crypto/buffer/buffer.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280304Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280304Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280304Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280304Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280304Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280304Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include <openssl/buffer.h> 6255714Skris 63280304Sjkim/* 64280304Sjkim * LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That 65280304Sjkim * function is applied in several functions in this file and this limit 66280304Sjkim * ensures that the result fits in an int. 67280304Sjkim */ 68234954Sbz#define LIMIT_BEFORE_EXPANSION 0x5ffffffc 69234954Sbz 7055714SkrisBUF_MEM *BUF_MEM_new(void) 71280304Sjkim{ 72280304Sjkim BUF_MEM *ret; 7355714Skris 74280304Sjkim ret = OPENSSL_malloc(sizeof(BUF_MEM)); 75280304Sjkim if (ret == NULL) { 76280304Sjkim BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE); 77280304Sjkim return (NULL); 78280304Sjkim } 79280304Sjkim ret->length = 0; 80280304Sjkim ret->max = 0; 81280304Sjkim ret->data = NULL; 82280304Sjkim return (ret); 83280304Sjkim} 8455714Skris 8555714Skrisvoid BUF_MEM_free(BUF_MEM *a) 86280304Sjkim{ 87280304Sjkim if (a == NULL) 88280304Sjkim return; 8955714Skris 90280304Sjkim if (a->data != NULL) { 91284285Sjkim OPENSSL_cleanse(a->data, a->max); 92280304Sjkim OPENSSL_free(a->data); 93280304Sjkim } 94280304Sjkim OPENSSL_free(a); 95280304Sjkim} 9655714Skris 97238405Sjkimint BUF_MEM_grow(BUF_MEM *str, size_t len) 98280304Sjkim{ 99280304Sjkim char *ret; 100280304Sjkim size_t n; 10155714Skris 102280304Sjkim if (str->length >= len) { 103280304Sjkim str->length = len; 104280304Sjkim return (len); 105280304Sjkim } 106280304Sjkim if (str->max >= len) { 107280304Sjkim memset(&str->data[str->length], 0, len - str->length); 108280304Sjkim str->length = len; 109280304Sjkim return (len); 110280304Sjkim } 111280304Sjkim /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 112280304Sjkim if (len > LIMIT_BEFORE_EXPANSION) { 113280304Sjkim BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE); 114280304Sjkim return 0; 115280304Sjkim } 116280304Sjkim n = (len + 3) / 3 * 4; 117280304Sjkim if (str->data == NULL) 118280304Sjkim ret = OPENSSL_malloc(n); 119280304Sjkim else 120280304Sjkim ret = OPENSSL_realloc(str->data, n); 121280304Sjkim if (ret == NULL) { 122280304Sjkim BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE); 123280304Sjkim len = 0; 124280304Sjkim } else { 125280304Sjkim str->data = ret; 126280304Sjkim str->max = n; 127280304Sjkim memset(&str->data[str->length], 0, len - str->length); 128280304Sjkim str->length = len; 129280304Sjkim } 130280304Sjkim return (len); 131280304Sjkim} 132109998Smarkm 133238405Sjkimint BUF_MEM_grow_clean(BUF_MEM *str, size_t len) 134280304Sjkim{ 135280304Sjkim char *ret; 136280304Sjkim size_t n; 137109998Smarkm 138280304Sjkim if (str->length >= len) { 139280304Sjkim memset(&str->data[len], 0, str->length - len); 140280304Sjkim str->length = len; 141280304Sjkim return (len); 142280304Sjkim } 143280304Sjkim if (str->max >= len) { 144280304Sjkim memset(&str->data[str->length], 0, len - str->length); 145280304Sjkim str->length = len; 146280304Sjkim return (len); 147280304Sjkim } 148280304Sjkim /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 149280304Sjkim if (len > LIMIT_BEFORE_EXPANSION) { 150280304Sjkim BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE); 151280304Sjkim return 0; 152280304Sjkim } 153280304Sjkim n = (len + 3) / 3 * 4; 154280304Sjkim if (str->data == NULL) 155280304Sjkim ret = OPENSSL_malloc(n); 156280304Sjkim else 157280304Sjkim ret = OPENSSL_realloc_clean(str->data, str->max, n); 158280304Sjkim if (ret == NULL) { 159280304Sjkim BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE); 160280304Sjkim len = 0; 161280304Sjkim } else { 162280304Sjkim str->data = ret; 163280304Sjkim str->max = n; 164280304Sjkim memset(&str->data[str->length], 0, len - str->length); 165280304Sjkim str->length = len; 166280304Sjkim } 167280304Sjkim return (len); 168280304Sjkim} 169238405Sjkim 170264331Sjkimvoid BUF_reverse(unsigned char *out, const unsigned char *in, size_t size) 171280304Sjkim{ 172280304Sjkim size_t i; 173280304Sjkim if (in) { 174280304Sjkim out += size - 1; 175280304Sjkim for (i = 0; i < size; i++) 176280304Sjkim *out-- = *in++; 177280304Sjkim } else { 178280304Sjkim unsigned char *q; 179280304Sjkim char c; 180280304Sjkim q = out + size - 1; 181280304Sjkim for (i = 0; i < size / 2; i++) { 182280304Sjkim c = *q; 183280304Sjkim *q-- = *out; 184280304Sjkim *out++ = c; 185280304Sjkim } 186280304Sjkim } 187280304Sjkim} 188