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TARGET_EFM32ZG_STK3200/TOOLCHAIN_ARM_MICRO/em_aes.h
- Committer:
- AnnaBridge
- Date:
- 2019-02-20
- Revision:
- 172:65be27845400
- Parent:
- 171:3a7713b1edbc
File content as of revision 172:65be27845400:
/***************************************************************************//** * @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 */