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Diff: TARGET_EFM32PG_STK3401/TOOLCHAIN_ARM_MICRO/em_aes.h
- Revision:
- 171:3a7713b1edbc
- Parent:
- 160:5571c4ff569f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TARGET_EFM32PG_STK3401/TOOLCHAIN_ARM_MICRO/em_aes.h Thu Nov 08 11:45:42 2018 +0000 @@ -0,0 +1,309 @@ +/***************************************************************************//** + * @file em_aes.h + * @brief Advanced encryption standard (AES) accelerator peripheral API. + * @version 5.3.3 + ******************************************************************************* + * # License + * <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.com</b> + ******************************************************************************* + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no + * obligation to support this Software. Silicon Labs is providing the + * Software "AS IS", with no express or implied warranties of any kind, + * including, but not limited to, any implied warranties of merchantability + * or fitness for any particular purpose or warranties against infringement + * of any proprietary rights of a third party. + * + * Silicon Labs will not be liable for any consequential, incidental, or + * special damages, or any other relief, or for any claim by any third party, + * arising from your use of this Software. + * + ******************************************************************************/ + +#ifndef EM_AES_H +#define EM_AES_H + +#include "em_device.h" +#if defined(AES_COUNT) && (AES_COUNT > 0) + +#include <stdbool.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/***************************************************************************//** + * @addtogroup emlib + * @{ + ******************************************************************************/ + +/***************************************************************************//** + * @addtogroup AES + * @brief Advanced Encryption Standard Accelerator (AES) Peripheral API. + * + * @details + * The AES peripheral supports AES block cipher encryption and decryption with + * 128 bit and 256 bit keys. The following block cipher modes are supported: + * @li CBC - Cipher Block Chaining mode + * @li CFB - Cipher Feedback mode + * @li CTR - Counter mode + * @li ECB - Electronic Code Book mode + * @li OFB - Output Feedback mode + * + * The following input/output notations should be noted: + * + * @li Input/output data (plaintext, ciphertext, key etc) are treated as + * byte arrays, starting with most significant byte. Ie, 32 bytes of + * plaintext (B0...B31) is located in memory in the same order, with B0 at + * the lower address and B31 at the higher address. + * + * @li Byte arrays must always be a multiple of AES block size, ie a multiple + * of 16. Padding, if required, is done at the end of the byte array. + * + * @li Byte arrays should be word (32 bit) aligned for performance + * considerations, since the array is accessed with 32 bit access type. + * The Cortex-M supports unaligned accesses, but with a performance penalty. + * + * @li It is possible to specify the same output buffer as input buffer + * as long as they point to the same address. In that case the provided input + * buffer is replaced with the encrypted/decrypted output. Notice that the + * buffers must be exactly overlapping. If partly overlapping, the + * behaviour is undefined. + * + * It is up to the user to use a cipher mode according to its requirements + * in order to not break security. Please refer to specific cipher mode + * theory for details. + * + * References: + * @li Wikipedia - Cipher modes, http://en.wikipedia.org/wiki/Cipher_modes + * + * @li Recommendation for Block Cipher Modes of Operation, + * NIST Special Publication 800-38A, 2001 Edition, + * http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf + * + * E.g. the following example shows how to perform an AES-128 CBC encryption: + * + * Enable clocks: + * @include em_aes_clock_enable.c + * + * Execute AES-128 CBC encryption: + * @include em_aes_basic_usage.c + * + * @{ + ******************************************************************************/ + +/******************************************************************************* + ****************************** TYPEDEFS *********************************** + ******************************************************************************/ + +/** + * @brief + * AES counter modification function pointer. + * @details + * Parameters: + * @li ctr - Ptr to byte array (16 bytes) holding counter to be modified. + */ +typedef void (*AES_CtrFuncPtr_TypeDef)(uint8_t *ctr); + +/******************************************************************************* + ***************************** PROTOTYPES ********************************** + ******************************************************************************/ + +void AES_CBC128(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv, + bool encrypt); + +#if defined(AES_CTRL_AES256) +void AES_CBC256(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv, + bool encrypt); +#endif + +void AES_CFB128(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv, + bool encrypt); + +#if defined(AES_CTRL_AES256) +void AES_CFB256(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv, + bool encrypt); +#endif + +void AES_CTR128(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + uint8_t *ctr, + AES_CtrFuncPtr_TypeDef ctrFunc); + +#if defined(AES_CTRL_AES256) +void AES_CTR256(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + uint8_t *ctr, + AES_CtrFuncPtr_TypeDef ctrFunc); +#endif + +void AES_CTRUpdate32Bit(uint8_t *ctr); + +void AES_DecryptKey128(uint8_t *out, const uint8_t *in); + +#if defined(AES_CTRL_AES256) +void AES_DecryptKey256(uint8_t *out, const uint8_t *in); +#endif + +void AES_ECB128(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + bool encrypt); + +#if defined(AES_CTRL_AES256) +void AES_ECB256(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + bool encrypt); +#endif + +/***************************************************************************//** + * @brief + * Clear one or more pending AES interrupts. + * + * @param[in] flags + * Pending AES interrupt source to clear. Use a bitwise logic OR combination of + * valid interrupt flags for the AES module (AES_IF_nnn). + ******************************************************************************/ +__STATIC_INLINE void AES_IntClear(uint32_t flags) +{ + AES->IFC = flags; +} + +/***************************************************************************//** + * @brief + * Disable one or more AES interrupts. + * + * @param[in] flags + * AES interrupt sources to disable. Use a bitwise logic OR combination of + * valid interrupt flags for the AES module (AES_IF_nnn). + ******************************************************************************/ +__STATIC_INLINE void AES_IntDisable(uint32_t flags) +{ + AES->IEN &= ~(flags); +} + +/***************************************************************************//** + * @brief + * Enable one or more AES interrupts. + * + * @note + * Depending on the use, a pending interrupt may already be set prior to + * enabling the interrupt. Consider using AES_IntClear() prior to enabling + * if such a pending interrupt should be ignored. + * + * @param[in] flags + * AES interrupt sources to enable. Use a bitwise logic OR combination of + * valid interrupt flags for the AES module (AES_IF_nnn). + ******************************************************************************/ +__STATIC_INLINE void AES_IntEnable(uint32_t flags) +{ + AES->IEN |= flags; +} + +/***************************************************************************//** + * @brief + * Get pending AES interrupt flags. + * + * @note + * The event bits are not cleared by the use of this function. + * + * @return + * AES interrupt sources pending. A bitwise logic OR combination of valid + * interrupt flags for the AES module (AES_IF_nnn). + ******************************************************************************/ +__STATIC_INLINE uint32_t AES_IntGet(void) +{ + return AES->IF; +} + +/***************************************************************************//** + * @brief + * Get enabled and pending AES interrupt flags. + * Useful for handling more interrupt sources in the same interrupt handler. + * + * @note + * Interrupt flags are not cleared by the use of this function. + * + * @return + * Pending and enabled AES interrupt sources + * The return value is the bitwise AND of + * - the enabled interrupt sources in AES_IEN and + * - the pending interrupt flags AES_IF + ******************************************************************************/ +__STATIC_INLINE uint32_t AES_IntGetEnabled(void) +{ + uint32_t ien; + + ien = AES->IEN; + return AES->IF & ien; +} + +/***************************************************************************//** + * @brief + * Set one or more pending AES interrupts from SW. + * + * @param[in] flags + * AES interrupt sources to set to pending. Use a bitwise logic OR combination + * of valid interrupt flags for the AES module (AES_IF_nnn). + ******************************************************************************/ +__STATIC_INLINE void AES_IntSet(uint32_t flags) +{ + AES->IFS = flags; +} + +void AES_OFB128(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv); + +#if defined(AES_CTRL_AES256) +void AES_OFB256(uint8_t *out, + const uint8_t *in, + unsigned int len, + const uint8_t *key, + const uint8_t *iv); +#endif + +/** @} (end addtogroup AES) */ +/** @} (end addtogroup emlib) */ + +#ifdef __cplusplus +} +#endif + +#endif /* defined(AES_COUNT) && (AES_COUNT > 0) */ +#endif /* EM_AES_H */