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75 lines
2.5 KiB
C
Executable File
75 lines
2.5 KiB
C
Executable File
#ifndef AWS_COMMON_ZERO_H
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#define AWS_COMMON_ZERO_H
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/*
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* Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#include <aws/common/stdbool.h>
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#include <aws/common/stdint.h>
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#include <string.h>
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AWS_EXTERN_C_BEGIN
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/**
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* Set each byte in the struct to zero.
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*/
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#define AWS_ZERO_STRUCT(object) \
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do { \
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memset(&(object), 0, sizeof(object)); \
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} while (0)
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/**
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* Set each byte in the array to zero.
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* Does not work with arrays of unknown bound.
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*/
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#define AWS_ZERO_ARRAY(array) memset((void *)(array), 0, sizeof(array))
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/**
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* Returns whether each byte in the object is zero.
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*/
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#ifdef CBMC
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/* clang-format off */
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# define AWS_IS_ZEROED(object) \
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__CPROVER_forall { \
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int i; \
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(i >= 0 && i < sizeof(object)) ==> ((const uint8_t *)&object)[i] == 0 \
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}
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/* clang-format on */
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#else
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# define AWS_IS_ZEROED(object) aws_is_mem_zeroed(&(object), sizeof(object))
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#endif
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/**
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* Returns whether each byte is zero.
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*/
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AWS_STATIC_IMPL
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bool aws_is_mem_zeroed(const void *buf, size_t bufsize);
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/**
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* Securely zeroes a memory buffer. This function will attempt to ensure that
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* the compiler will not optimize away this zeroing operation.
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*/
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AWS_COMMON_API
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void aws_secure_zero(void *pBuf, size_t bufsize);
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#ifndef AWS_NO_STATIC_IMPL
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# include <aws/common/zero.inl>
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#endif /* AWS_NO_STATIC_IMPL */
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AWS_EXTERN_C_END
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#endif /* AWS_COMMON_ZERO_H */
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