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-/* ---------------------------------------------------------------------------- */
-/* Atmel Microcontroller Software Support */
-/* SAM Software Package License */
-/* ---------------------------------------------------------------------------- */
-/* Copyright (c) 2015, Atmel Corporation */
-/* */
-/* All rights reserved. */
-/* */
-/* Redistribution and use in source and binary forms, with or without */
-/* modification, are permitted provided that the following condition is met: */
-/* */
-/* - Redistributions of source code must retain the above copyright notice, */
-/* this list of conditions and the disclaimer below. */
-/* */
-/* Atmel's name may not be used to endorse or promote products derived from */
-/* this software without specific prior written permission. */
-/* */
-/* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */
-/* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */
-/* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */
-/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
-/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
-/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */
-/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
-/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
-/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
-/* ---------------------------------------------------------------------------- */
-
-/** \addtogroup aes_module Working with AES
- * \ingroup peripherals_module
- * The AES driver provides the interface to configure and use the AES peripheral.
- * \n
- *
- * The Advanced Encryption Standard (AES) specifies a FIPS-approved
- * cryptographic algorithm that can be used to protect electronic data. The AES
- * algorithm is a symmetric block cipher that can encrypt (encipher) and decrypt
- * (decipher) information.
- * Encryption converts data to an unintelligible form called ciphertext.
- * Decrypting the ciphertext converts the data back into its original form,
- * called plaintext. The CIPHER bit in the AES Mode Register (AES_MR) allows
- * selection between the encryption and the decryption processes. The AES is
- * capable of using cryptographic keys of 128/192/256 bits to encrypt and
- * decrypt data in blocks of 128 bits.
- * This 128-bit/192-bit/256-bit key is defined in the Key Registers (AES_KEYWRx)
- * and set by AES_WriteKey(). The input to the encryption processes of the CBC,
- * CFB, and OFB modes includes, in addition to the plaintext, a 128-bit data
- * block called the initialization vector (IV),
- * which must be set with AES_SetVector().
- * The initialization vector is used in an initial step in the encryption of a
- * message and in the corresponding decryption of the message.
- * The Initialization Vector Registers are also used by the CTR mode to set the
- * counter value.
- *
- * To Enable a AES encryption and decryption,the user has to follow these few
- * steps:
- * <ul>
- * <li> A software triggered hardware reset of the AES interface is performed
- * by AES_SoftReset().</li>
- * <li> Configure AES algorithm mode, key mode, start mode and operation mode by
- * AES_Configure(). </li>
- * <li> Input AES data for encryption and decryption with function
- * AES_SetInput() </li>
- * <li> Set AES key with function AES_WriteKey(). </li>
- * <li> To start the encryption or the decryption process with AES_Start()</li>
- * <li> To get the encryption or decryption result by AES_GetOutput() </li>
- * </ul>
- *
- *
- * For more accurate information, please look at the AES section of the
- * Datasheet.
- *
- * Related files :\n
- * \ref aes.c\n
- * \ref aes.h\n
- */
-/*@{*/
-/*@}*/
-
-
-/**
- * \file
- *
- * Implementation of Advanced Encryption Standard (AES)
- *
- */
-
-/*----------------------------------------------------------------------------
- * Headers
- *----------------------------------------------------------------------------*/
-
-#include "chip.h"
-#include "aes.h"
-
-/*----------------------------------------------------------------------------
- * Exported functions
- *----------------------------------------------------------------------------*/
-
-/**
- * \brief Starts Manual encryption/decryption process.
- */
-void AES_Start(void)
-{
- AES->AES_CR = AES_CR_START;
-}
-
-/**
- * \brief Resets the AES. A software triggered hardware reset of the AES
- * interface is performed.
- */
-void AES_SoftReset(void)
-{
- AES->AES_CR = AES_CR_SWRST;
-}
-
-/**
- * \brief Configures an AES peripheral with the specified parameters.
- * \param mode Desired value for the AES mode register (see the datasheet).
- */
-void AES_Configure(uint32_t mode)
-{
- AES->AES_MR = mode;
-}
-
-/**
- * \brief Enables the selected interrupts sources on a AES peripheral.
- * \param sources Bitwise OR of selected interrupt sources.
- */
-void AES_EnableIt(uint32_t sources)
-{
- AES->AES_IER = sources;
-}
-
-/**
- * \brief Disables the selected interrupts sources on a AES peripheral.
- * \param sources Bitwise OR of selected interrupt sources.
- */
-void AES_DisableIt(uint32_t sources)
-{
- AES->AES_IDR = sources;
-}
-
-/**
- * \brief Get the current status register of the given AES peripheral.
- * \return AES status register.
- */
-uint32_t AES_GetStatus(void)
-{
- return AES->AES_ISR;
-}
-
-/**
- * \brief Set the 128-bit/192-bit/256-bit cryptographic key used for
- * encryption/decryption.
- * \param pKey Pointer to a 16/24/32 bytes cipher key.
- * \param keyLength length of key
- */
-void AES_WriteKey(const uint32_t *pKey, uint32_t keyLength)
-{
- AES->AES_KEYWR[0] = pKey[0];
- AES->AES_KEYWR[1] = pKey[1];
- AES->AES_KEYWR[2] = pKey[2];
- AES->AES_KEYWR[3] = pKey[3];
-
- if (keyLength >= 24) {
- AES->AES_KEYWR[4] = pKey[4];
- AES->AES_KEYWR[5] = pKey[5];
- }
-
- if (keyLength == 32) {
- AES->AES_KEYWR[6] = pKey[6];
- AES->AES_KEYWR[7] = pKey[7];
- }
-}
-
-/**
- * \brief Set the for 32-bit input Data allow to set the 128-bit data block
- * used for encryption/decryption.
- * \param data Pointer to the 16-bytes data to cipher/decipher.
- */
-void AES_SetInput(uint32_t *data)
-{
- uint8_t i;
-
- for (i = 0; i < 4; i++)
- AES->AES_IDATAR[i] = data[i];
-}
-
-/**
- * \brief Get the four 32-bit data contain the 128-bit data block which
- * has been encrypted/decrypted.
- * \param data pointer to the word that has been encrypted/decrypted..
- */
-void AES_GetOutput(uint32_t *data)
-{
- uint8_t i;
-
- for (i = 0; i < 4; i++)
- data[i] = AES->AES_ODATAR[i];
-}
-
-/**
- * \brief Set four 64-bit initialization vector data block, which is used by
- * some modes of operation as an additional initial input.
- * \param pVector point to the word of the initialization vector.
- */
-void AES_SetVector(const uint32_t *pVector)
-{
- AES->AES_IVR[0] = pVector[0];
- AES->AES_IVR[1] = pVector[1];
- AES->AES_IVR[2] = pVector[2];
- AES->AES_IVR[3] = pVector[3];
-}
-
-/**
- * \brief Set Length in bytes of the AAD data that is to be processed.
- * \param len Length.
- */
-void AES_SetAadLen(uint32_t len)
-{
- AES->AES_AADLENR = len;
-}
-
-/**
- * \brief Set Length in bytes of the Length in bytes of the
- * plaintext/ciphertext (C) data that is to be processed..
- * \param len Length.
- */
-void AES_SetDataLen(uint32_t len)
-{
- AES->AES_CLENR = len;
-}
-
-/**
- * \brief Set The four 32-bit Hash Word registers expose the intermediate GHASH
- * value. May be read to save the current GHASH value so processing can later be
- * resumed, presumably on a later message fragment. modes of operation as an
- * additional initial input.
- * \param hash point to the word of the hash.
- */
-void AES_SetGcmHash(uint32_t *hash)
-{
- uint8_t i;
-
- for (i = 0; i < 4; i++)
- AES->AES_GHASHR[i] = hash[i];
-}
-
-
-/**
- * \brief Get The four 32-bit Tag which contain the final 128-bit GCM
- * Authentication tag Ħ°TĦħ when GCM processing is complete.
- * \param tag point to the word of the tag.
- */
-void AES_GetGcmTag(uint32_t *tag)
-{
- uint8_t i;
-
- for (i = 0; i < 4; i++)
- tag[i] = AES->AES_TAGR[i];
-}
-
-/**
- * \brief Reports the current value of the 32-bit GCM counter
- * \param counter Point to value of GCM counter.
- */
-void AES_GetGcmCounter(uint32_t *counter)
-{
- *counter = AES->AES_CTRR;
-}
-
-
-/**
- * \brief Get the four 32-bit data contain the 128-bit H value computed from
- * the KEYW value
- * \param data point to the word that has been encrypted/decrypted.
- */
-void AES_GetGcmH(uint32_t *h)
-{
- uint8_t i;
-
- for (i = 0; i < 4; i++)
- h[i] = AES->AES_GCMHR[i];
-}
-
-
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