289 lines
11 KiB
C
289 lines
11 KiB
C
/****************************************************************************
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* drivers/wireless/spirit/include/spirit_aes.h
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* Configuration and management of SPIRIT AES Engine. */
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#ifndef __DRIVERS_WIRELESS_SPIRIT_INCLUDE_SPIRIT_AES_H
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#define __DRIVERS_WIRELESS_SPIRIT_INCLUDE_SPIRIT_AES_H
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/* In order to encrypt data, the user must manage the AES_END IRQ. The data
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* must be split in blocks of 16 bytes and written into the AES DATA IN
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* registers. Then, after the key is written into the AES KEY registers, a
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* command of Execute encryption has to be sent.
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*
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* Example:
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*
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* spirit_aes_write_datain(spirit, inbuffer , buflen);
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* spirit_aes_encrypt(spirit);
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*
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* Wait for encryption done (signalled via interrupt)
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*
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* spirit_aes_read_dataout(espirit, outbuffer , buflen);
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*
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* In order to decrypt data, the user must manage the AES_END IRQ and have a
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* decryption key. There are two operative modes to make the data
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* decryption:
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*
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* 1. Derive the decryption key from the encryption key and decrypt data
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* directly using the spirit_aes_derivekey_decrypt() function
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*
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* Example:
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*
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* spirit_aes_write_datain(spirit, inbuffer , buflen);
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* spirit_aes_derivekey_decrypt(spirit);
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*
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* Wait for key derivation to complete (signalled via interrupt)
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*
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* spirit_aes_read_dataout(spirit, outbuffer , buflen);
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*
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* 2 Derive the decryption key from the encryption key using the
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* spirit_aes_enc2deckey() function, store it into the AES KEY
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* registers and then decrypt data using the spirit_aes_decrypt()
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* function
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*
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* Example:
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*
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* spirit_aes_write_datain(spirit, keyenc, 16);
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* spirit_aes_enc2deckey(spirit);
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*
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* Wait for key derivation to complete (signalled via interrupt)
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*
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* spirit_aes_read_dataout(spirit, keydec, 16);
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*
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* spirit_aes_write_key(key_dec);
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* spirit_aes_write_datain(inbuffer , 16);
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* spirit_aes_decrypt(spirit);
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*
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* Wait for encryption done (signalled via interrupt)
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*
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* spirit_aes_read_dataout(spirit, outbuffer, buflen);
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "spirit_regs.h"
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#include "spirit_types.h"
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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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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* 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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* 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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* 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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* 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 key.
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* The first byte of the buffer shall be the most significant byte
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* 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.
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* 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,
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FAR uint8_t *key);
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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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* 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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* 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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* 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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#ifdef __cplusplus
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}
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#endif
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#endif /* __DRIVERS_WIRELESS_SPIRIT_INCLUDE_SPIRIT_AES_H */
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