-/* crypto/buffer/buffer.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#include <stdio.h>
-#include "cryptlib.h"
-#include "buffer.h"
+#include "internal/cryptlib.h"
+#include <openssl/buffer.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_ex(unsigned long flags)
+{
+ BUF_MEM *ret;
+
+ ret = BUF_MEM_new();
+ if (ret != NULL)
+ ret->flags = flags;
+ return ret;
+}
BUF_MEM *BUF_MEM_new(void)
- {
- BUF_MEM *ret;
+{
+ BUF_MEM *ret;
- ret=Malloc(sizeof(BUF_MEM));
- if (ret == NULL)
- {
- BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- ret->length=0;
- ret->max=0;
- ret->data=NULL;
- return(ret);
- }
+ ret = OPENSSL_zalloc(sizeof(*ret));
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+ return ret;
+}
void BUF_MEM_free(BUF_MEM *a)
- {
- if(a == NULL)
- return;
+{
+ if (a == NULL)
+ return;
+ if (a->data != NULL) {
+ if (a->flags & BUF_MEM_FLAG_SECURE)
+ OPENSSL_secure_clear_free(a->data, a->max);
+ else
+ OPENSSL_clear_free(a->data, a->max);
+ }
+ OPENSSL_free(a);
+}
- if (a->data != NULL)
- {
- memset(a->data,0,(unsigned int)a->max);
- Free(a->data);
- }
- Free(a);
- }
+/* Allocate a block of secure memory; copy over old data if there
+ * was any, and then free it. */
+static char *sec_alloc_realloc(BUF_MEM *str, size_t len)
+{
+ char *ret;
-int BUF_MEM_grow(BUF_MEM *str, int len)
- {
- char *ret;
- unsigned int n;
+ ret = OPENSSL_secure_malloc(len);
+ if (str->data != NULL) {
+ if (ret != NULL) {
+ memcpy(ret, str->data, str->length);
+ OPENSSL_secure_clear_free(str->data, str->length);
+ str->data = NULL;
+ }
+ }
+ return ret;
+}
- if (str->length >= len)
- {
- str->length=len;
- return(len);
- }
- if (str->max >= len)
- {
- memset(&str->data[str->length],0,len-str->length);
- str->length=len;
- return(len);
- }
- n=(len+3)/3*4;
- if (str->data == NULL)
- ret=Malloc(n);
- else
- ret=Realloc(str->data,n);
- if (ret == NULL)
- {
- BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
- len=0;
- }
- else
- {
- str->data=ret;
- str->length=len;
- str->max=n;
- }
- return(len);
- }
+size_t BUF_MEM_grow(BUF_MEM *str, size_t len)
+{
+ char *ret;
+ size_t n;
-char *BUF_strdup(const char *str)
- {
- char *ret;
- int n;
+ if (str->length >= len) {
+ str->length = len;
+ return len;
+ }
+ if (str->max >= len) {
+ if (str->data != NULL)
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ return len;
+ }
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION) {
+ BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ n = (len + 3) / 3 * 4;
+ if ((str->flags & BUF_MEM_FLAG_SECURE))
+ ret = sec_alloc_realloc(str, n);
+ else
+ ret = OPENSSL_realloc(str->data, n);
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
+ len = 0;
+ } else {
+ str->data = ret;
+ str->max = n;
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ }
+ return len;
+}
- if (str == NULL) return(NULL);
+size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
+{
+ char *ret;
+ size_t n;
- n=strlen(str);
- ret=Malloc(n+1);
- if (ret == NULL)
- {
- BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- memcpy(ret,str,n+1);
- return(ret);
- }
+ if (str->length >= len) {
+ if (str->data != NULL)
+ memset(&str->data[len], 0, str->length - len);
+ str->length = len;
+ return len;
+ }
+ if (str->max >= len) {
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ return len;
+ }
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION) {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ n = (len + 3) / 3 * 4;
+ if ((str->flags & BUF_MEM_FLAG_SECURE))
+ ret = sec_alloc_realloc(str, n);
+ else
+ ret = OPENSSL_clear_realloc(str->data, str->max, n);
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
+ len = 0;
+ } else {
+ str->data = ret;
+ str->max = n;
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ }
+ return len;
+}
+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;
+ }
+ }
+}
projects / openssl.git / blobdiff