From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Fri, 30 Apr 2021 00:33:56 +0200 Subject: initial/final commit --- openssl-1.1.0h/crypto/buffer/buffer.c | 166 ++++++++++++++++++++++++++++++++++ 1 file changed, 166 insertions(+) create mode 100644 openssl-1.1.0h/crypto/buffer/buffer.c (limited to 'openssl-1.1.0h/crypto/buffer/buffer.c') diff --git a/openssl-1.1.0h/crypto/buffer/buffer.c b/openssl-1.1.0h/crypto/buffer/buffer.c new file mode 100644 index 0000000..f3f8a1b --- /dev/null +++ b/openssl-1.1.0h/crypto/buffer/buffer.c @@ -0,0 +1,166 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * 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 +#include "internal/cryptlib.h" +#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_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; + + 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->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); +} + +/* 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; + + 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); +} + +size_t 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) { + 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); +} + +size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len) +{ + char *ret; + size_t n; + + 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; + } + } +} -- cgit v1.2.3