Arti Zirk
244fdbc35c
subrepo: subdir: "libopencm3" merged: "f5813a54" upstream: origin: "https://github.com/libopencm3/libopencm3" branch: "master" commit: "f5813a54" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/** @addtogroup hash_file HASH Peripheral API
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*
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* @ingroup peripheral_apis
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*
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* @author @htmlonly © @endhtmlonly 2013
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* Mikhail Avkhimenia <mikhail@avkhimenia.net>
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*
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* This library supports the HASH processor in the STM32F2 and STM32F4
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* series of ARM Cortex Microcontrollers by ST Microelectronics.
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*
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* LGPL License Terms @ref lgpl_license
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* */
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2013 Mikhail Avkhimenia <mikhail@avkhimenia.net>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/hash.h>
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Set Mode
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Sets up the specified mode - either HASH or HMAC.
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@param[in] mode unsigned int8. Hash processor mode: @ref hash_mode
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*/
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void hash_set_mode(uint8_t mode)
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{
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HASH_CR &= ~HASH_CR_MODE;
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HASH_CR |= mode;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Set Algorithm
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Sets up the specified algorithm - either MD5 or SHA1.
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@param[in] algorithm unsigned int8. Hash algorithm: @ref hash_algorithm
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*/
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void hash_set_algorithm(uint8_t algorithm)
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{
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HASH_CR &= ~HASH_CR_ALGO;
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HASH_CR |= algorithm;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Set Data Type
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Sets up the specified data type: 32Bit, 16Bit, 8Bit, Bitstring.
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@param[in] datatype unsigned int8. Hash data type: @ref hash_data_type
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*/
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void hash_set_data_type(uint8_t datatype)
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{
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HASH_CR &= ~HASH_CR_DATATYPE;
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HASH_CR |= datatype;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Set Key Length
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Sets up the specified key length: Long, Short.
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@param[in] keylength unsigned int8. Hash data type: @ref hash_key_length
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*/
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void hash_set_key_length(uint8_t keylength)
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{
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HASH_CR &= ~HASH_CR_LKEY;
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HASH_CR |= keylength;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Set Last Word Valid Bits
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Specifies the number of valid bits in the last word.
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@param[in] validbits unsigned int8. Number of valid bits.
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*/
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void hash_set_last_word_valid_bits(uint8_t validbits)
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{
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HASH_STR &= ~(HASH_STR_NBW);
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HASH_STR |= validbits;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Init
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Initializes the HASH processor.
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*/
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void hash_init()
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{
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HASH_CR |= HASH_CR_INIT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Add data
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Puts data into the HASH processor's queue.
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@param[in] data unsigned int32. Hash input data.
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*/
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void hash_add_data(uint32_t data)
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{
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HASH_DIN = data;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Digest
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Starts the processing of the last data block.
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*/
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void hash_digest()
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{
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HASH_STR |= HASH_STR_DCAL;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief HASH Get Hash Result
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Makes a copy of the resulting hash.
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@param[out] data unsigned int32. Hash 4\5 words long depending on the algorithm.
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*/
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void hash_get_result(uint32_t *data)
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{
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data[0] = HASH_HR[0];
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data[1] = HASH_HR[1];
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data[2] = HASH_HR[2];
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data[3] = HASH_HR[3];
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if ((HASH_CR & HASH_CR_ALGO) == HASH_ALGO_SHA1) {
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data[4] = HASH_HR[4];
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}
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}
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/**@}*/
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