/* $OpenBSD: buffer.c,v 1.20 2014/07/10 13:58:22 jsing 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 #include #include #include #include /* 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; 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); } void BUF_MEM_free(BUF_MEM *a) { if (a == NULL) return; if (a->data != NULL) { explicit_bzero(a->data, a->max); free(a->data); } free(a); } int BUF_MEM_grow(BUF_MEM *str, size_t len) { char *ret; size_t n; 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); } /* 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; 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->max = n; memset(&str->data[str->length], 0, len - str->length); str->length = len; } return (len); } int BUF_MEM_grow_clean(BUF_MEM *str, size_t len) { char *ret; size_t n; if (str->length >= len) { 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; ret = malloc(n); /* we're not shrinking - that case returns above */ if ((ret != NULL) && (str->data != NULL)) { memcpy(ret, str->data, str->max); explicit_bzero(str->data, str->max); free(str->data); } 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; } } }