1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* crypto/buffer/buffer.c */ 2656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * All rights reserved. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This package is an SSL implementation written 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * by Eric Young (eay@cryptsoft.com). 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The implementation was written so as to conform with Netscapes SSL. 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This library is free for commercial and non-commercial use as long as 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the following conditions are aheared to. The following conditions 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * apply to all code found in this distribution, be it the RC4, RSA, 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * included with this distribution is covered by the same copyright terms 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright remains Eric Young's, and as such any Copyright notices in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the code are not to be removed. 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * If this package is used in a product, Eric Young should be given attribution 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * as the author of the parts of the library used. 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This can be in the form of a textual message at program startup or 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * in documentation (online or textual) provided with the package. 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the copyright 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in the 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * documentation and/or other materials provided with the distribution. 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this software 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * must display the following acknowledgement: 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes cryptographic software written by 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Eric Young (eay@cryptsoft.com)" 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The word 'cryptographic' can be left out if the rouines from the library 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * being used are not cryptographic related :-). 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. If you include any Windows specific code (or a derivative thereof) from 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the apps directory (application code) you must include an acknowledgement: 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SUCH DAMAGE. 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The licence and distribution terms for any publically available version or 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * derivative of this code cannot be changed. i.e. this code cannot simply be 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * copied and put under another distribution licence 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * [including the GNU Public Licence.] 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <stdio.h> 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "cryptlib.h" 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/buffer.h> 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 63243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom/* LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That 64243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom * function is applied in several functions in this file and this limit ensures 65243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom * that the result fits in an int. */ 66243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom#define LIMIT_BEFORE_EXPANSION 0x5ffffffc 67243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectBUF_MEM *BUF_MEM_new(void) 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BUF_MEM *ret; 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=OPENSSL_malloc(sizeof(BUF_MEM)); 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE); 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(NULL); 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret->length=0; 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret->max=0; 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret->data=NULL; 81656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(ret); 82656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 83656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 84656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectvoid BUF_MEM_free(BUF_MEM *a) 85656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 86656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(a == NULL) 87656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return; 88656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 89656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (a->data != NULL) 90656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 91656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(a->data,0,(unsigned int)a->max); 92656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project OPENSSL_free(a->data); 93656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 94656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project OPENSSL_free(a); 95656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 96656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 97221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromint BUF_MEM_grow(BUF_MEM *str, size_t len) 98656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 99656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project char *ret; 100221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t n; 101656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 102656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->length >= len) 103656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 104656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 106656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->max >= len) 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(&str->data[str->length],0,len-str->length); 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 113243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 114243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom if (len > LIMIT_BEFORE_EXPANSION) 115243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom { 116243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 117243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom return 0; 118243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom } 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project n=(len+3)/3*4; 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->data == NULL) 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=OPENSSL_malloc(n); 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=OPENSSL_realloc(str->data,n); 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 125656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project len=0; 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->data=ret; 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->max=n; 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(&str->data[str->length],0,len-str->length); 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 139221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromint BUF_MEM_grow_clean(BUF_MEM *str, size_t len) 140656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 141656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project char *ret; 142221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t n; 143656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 144656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->length >= len) 145656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 146656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(&str->data[len],0,str->length-len); 147656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 148656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 149656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 150656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->max >= len) 151656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 152656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(&str->data[str->length],0,len-str->length); 153656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 154656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 155656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 156243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 157243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom if (len > LIMIT_BEFORE_EXPANSION) 158243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom { 159f42d491ab90c82302b0054c62014c1ee9b638affBrian Carlstrom BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE); 160243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom return 0; 161243c891739b450bb831aabcd5cd601da4828cd25Brian Carlstrom } 162656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project n=(len+3)/3*4; 163656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (str->data == NULL) 164656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=OPENSSL_malloc(n); 165656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 166656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=OPENSSL_realloc_clean(str->data,str->max,n); 167656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 168656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 169656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE); 170656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project len=0; 171656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 172656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 173656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 174656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->data=ret; 175656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->max=n; 176656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memset(&str->data[str->length],0,len-str->length); 177656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project str->length=len; 178656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 179656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(len); 180656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 181221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 182ff41a4bc41ae1e1391f9b05117623ff70b985983Kenny Rootvoid BUF_reverse(unsigned char *out, const unsigned char *in, size_t size) 183221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 184221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t i; 185221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (in) 186221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 187221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out += size - 1; 188221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for (i = 0; i < size; i++) 189ff41a4bc41ae1e1391f9b05117623ff70b985983Kenny Root *out-- = *in++; 190221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 191221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom else 192221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 193221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char *q; 194221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom char c; 195221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom q = out + size - 1; 196221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for (i = 0; i < size/2; i++) 197221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 198221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom c = *q; 199221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *q-- = *out; 200221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *out++ = c; 201221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 202221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 203221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 204