15e35d5bc1
Added hash processor register definitions and main functions. Hash processor is supported in stm32f21, stm32f41 and stm32f43 and can be used to calculate Md5 and Sha1.
160 lines
3.9 KiB
C
160 lines
3.9 KiB
C
/** @addtogroup hash_file
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@author @htmlonly © @endhtmlonly 2013 Mikhail Avkhimenia <mikhail@avkhimenia.net>
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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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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(u8 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(u8 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(u8 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(u8 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(u8 validbits)
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{
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HASH_STR &= ~(HASH_STR_NBW);
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HASH_STR |= 32 - 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(u32 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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@param[in] algorithm unsigned int8. Hash algorithm: @ref hash_algorithm
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*/
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void hash_get_result(u32 *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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