363 lines
11 KiB
C
363 lines
11 KiB
C
/******************************************************************************
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* drivers/wireless/spirit/lib/spirit_aes.c
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* Configuration and management of SPIRIT AES Engine.
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*
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* Copyright(c) 2015 STMicroelectronics
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* Author: VMA division - AMS
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* Version 3.2.2 08-July-2015
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*
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* Adapted for NuttX by:
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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/******************************************************************************
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* Included Files
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******************************************************************************/
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#include <assert.h>
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#include "spirit_aes.h"
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#include "spirit_spi.h"
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/******************************************************************************
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* Public Functions
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******************************************************************************/
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/******************************************************************************
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* Name: spirit_aes_enable
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*
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* Description:
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* Enables or Disables the AES engine.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* newstate new state for AES engine.
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* This parameter can be: S_ENABLE or S_DISABLE.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_enable(FAR struct spirit_library_s *spirit,
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enum spirit_functional_state_e newstate)
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{
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uint8_t regval = 0;
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int ret;
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/* Check the parameters */
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DEBUGASSERT(IS_SPIRIT_FUNCTIONAL_STATE(newstate));
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/* Modifies the register value */
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ret = spirit_reg_read(spirit, ANA_FUNC_CONF0_BASE, ®val, 1);
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if (ret >= 0)
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{
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if (newstate == S_ENABLE)
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{
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regval |= AES_MASK;
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}
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else
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{
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regval &= ~AES_MASK;
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}
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/* Write to the ANA_FUNC_CONF0 register to enable or disable the AES
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* engine
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*/
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ret = spirit_reg_write(spirit, ANA_FUNC_CONF0_BASE, ®val, 1);
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_aes_write_datain
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*
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* Description:
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* Writes the data to encrypt or decrypt, or the encryption key for the
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* derive decryption key operation into the AES_DATA_IN registers.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* buffer - Pointer to the user data buffer. The first byte of the array
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* must be the MSB byte and it will be put in the AES_DATA_IN[0]
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* register, while the last one must be the LSB and it will be
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* put in the AES_DATA_IN[buflen-1] register. If data to write
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* are less than 16 bytes the remaining AES_DATA_IN registers
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* will be filled with bytes equal to 0.
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* buflen - Length of data in bytes.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_write_datain(FAR struct spirit_library_s *spirit,
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FAR const uint8_t *buffer, uint8_t buflen)
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{
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uint8_t datain[16];
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uint8_t i;
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/* Verifies that there are no more than 16 bytes */
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(buflen > 16) ? (buflen = 16) : buflen;
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/* Fill the datain with the data buffer, using padding */
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for (i = 0; i < 16; i++)
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{
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if (i < (16 - buflen))
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{
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datain[i] = 0;
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}
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else
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{
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datain[i] = buffer[15 - i];
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}
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}
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/* Writes the AES_DATA_IN registers */
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return spirit_reg_write(spirit, AES_DATA_IN_15_BASE, datain, 16);
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}
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/******************************************************************************
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* Name: spirit_aes_read_dataout
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*
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* Description:
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* Returns the encrypted or decrypted data or the description key from the
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* AES_DATA_OUT register.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* buffer - pointer to the user data buffer. The AES_DATA_OUT[0]
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* register value will be put as first element of the buffer
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* (MSB), while the AES_DAT_OUT[buflen-1] register value will be
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* put as last element of the buffer (LSB).
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* buflen - Length of data to read in bytes.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_read_dataout(FAR struct spirit_library_s *spirit,
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FAR uint8_t *buffer, uint8_t buflen)
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{
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uint8_t dataout[16];
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uint8_t address;
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int ret;
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/* Verifies that there are no more than 16 bytes */
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if (buflen > 16)
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{
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buflen = 16;
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}
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/* Evaluates the address of AES_DATA_OUT from which start to read */
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address = AES_DATA_OUT_15_BASE + 16 - buflen;
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/* Reads the exact number of AES_DATA_OUT registers */
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ret = spirit_reg_read(spirit, address, dataout, buflen);
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if (ret >= 0)
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{
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int i;
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/* Copy in the user buffer the read values changing the order */
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for (i = buflen - 1; i >= 0; i--)
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{
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*buffer++ = dataout[i];
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}
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_aes_write_key
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*
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* Description:
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* Writes the encryption key into the AES_KEY_IN register.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* key - Pointer to the buffer of 4 words containing the AES key.
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* The first byte of the buffer must be the most significant byte
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* AES_KEY_0 of the AES key. The last byte of the buffer must be
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* the less significant byte AES_KEY_15 of the AES key.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_write_key(FAR struct spirit_library_s *spirit,
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FAR const uint8_t *key)
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{
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uint8_t tmp[16];
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int i;
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for (i = 0; i < 16; i++)
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{
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tmp[15 - i] = key[i];
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}
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/* Write to the AES_DATA_IN registers */
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return spirit_reg_write(spirit, AES_KEY_IN_15_BASE, tmp, 16);
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}
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/******************************************************************************
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* Name: spirit_aes_read_key
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*
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* Description:
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* Returns the encryption/decryption key from the AES_KEY_IN register.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* key - Pointer to the buffer of 4 words (16 bytes) containing the AES
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* key. The first byte of the buffer shall be the most
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* significant byte AES_KEY_0 of the AES key.
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* The last byte of the buffer shall be the less significant byte
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* AES_KEY_15 of the AES key. This parameter is an uint8_t*.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_read_key(FAR struct spirit_library_s *spirit, FAR uint8_t *key)
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{
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uint8_t tmp[16];
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int ret;
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int i;
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/* Reads the AES_DATA_IN registers */
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ret = spirit_reg_read(spirit, AES_KEY_IN_15_BASE, tmp, 16);
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if (ret >= 0)
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{
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for (i = 0; i < 16; i++)
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{
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key[i] = tmp[15 - i];
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}
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_aes_enc2deckey
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*
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* Description:
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* Derives the decryption key from a given encryption key.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_enc2deckey(FAR struct spirit_library_s *spirit)
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{
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/* Sends the COMMAND_AES_KEY command */
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return spirit_command(spirit, COMMAND_AES_KEY);
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}
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/******************************************************************************
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* Name: spirit_aes_encrypt
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*
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* Description:
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* Executes the encryption operation.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_encrypt(FAR struct spirit_library_s *spirit)
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{
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/* Sends the COMMAND_AES_ENC command */
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return spirit_command(spirit, COMMAND_AES_ENC);
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}
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/******************************************************************************
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* Name: spirit_aes_decrypt
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*
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* Description:
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* Executes the decryption operation.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_decrypt(FAR struct spirit_library_s *spirit)
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{
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/* Sends the COMMAND_AES_DEC command */
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return spirit_command(spirit, COMMAND_AES_DEC);
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}
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/******************************************************************************
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* Name: spirit_aes_derivekey_decrypt
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*
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* Description:
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* Executes the key derivation and the decryption operation.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on any failure.
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*
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******************************************************************************/
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int spirit_aes_derivekey_decrypt(FAR struct spirit_library_s *spirit)
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{
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/* Sends the COMMAND_AES_KEY_DEC command */
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return spirit_command(spirit, COMMAND_AES_KEY_DEC);
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}
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