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The elements of the HAVEGE state are manipulated with bitwise operations, with the expectations that the elements are 32-bit unsigned integers (or larger). But they are declared as int, and so the code has undefined behavior. Clang with Asan correctly points out some shifts that reach the sign bit. Since these are supposed to be 32-bit unsigned integers, declare them as uint32_t. This is technically an API break, since the type mbedtls_havege_state is exposed in a public header. However normal applications should not be affected.
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/**
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* \file havege.h
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*
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* \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
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*/
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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_HAVEGE_H
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#define MBEDTLS_HAVEGE_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief HAVEGE state structure
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*/
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typedef struct mbedtls_havege_state
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{
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uint32_t PT1, PT2, offset[2];
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uint32_t pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
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uint32_t WALK[8192];
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}
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mbedtls_havege_state;
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/**
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* \brief HAVEGE initialization
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*
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* \param hs HAVEGE state to be initialized
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*/
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void mbedtls_havege_init( mbedtls_havege_state *hs );
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/**
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* \brief Clear HAVEGE state
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*
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* \param hs HAVEGE state to be cleared
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*/
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void mbedtls_havege_free( mbedtls_havege_state *hs );
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/**
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* \brief HAVEGE rand function
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*
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* \param p_rng A HAVEGE state
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* \param output Buffer to fill
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* \param len Length of buffer
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*
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* \return 0
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*/
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int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
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#ifdef __cplusplus
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}
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#endif
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#endif /* havege.h */
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