AES - Advanced Encryption Standard module

Driver for the AES (Advanced Encryption Standard) module.

Provides functions for configuring and initiating ciphering/deciphering with AES algorithms. Several modes(ECB, CBC, OFB, CFB or CTR) and key sizes(128-, 192- or 256-bit) are supported, in addition to manual or DMA-based data input to the AES module.

Data Structures
struct	aes_config
	AES Configuration structure. More...
struct	aes_dev_inst
	AES driver software instance structure. More...

Typedefs
typedef void(*	aes_callback_t )(void)
	Interrupt callback function type for AES. More...
typedef enum aes_interrupt_source	aes_interrupt_source_t
	AES interrupt source type. More...

Enumerations
enum	aes_cfb_size {   AES_CFB_SIZE_128 = 0,   AES_CFB_SIZE_64,   AES_CFB_SIZE_32,   AES_CFB_SIZE_16,   AES_CFB_SIZE_8 }
	AES CFB size. More...
enum	aes_countermeature_type {   AES_COUNTERMEASURE_TYPE_1 = 0x01,   AES_COUNTERMEASURE_TYPE_2 = 0x02,   AES_COUNTERMEASURE_TYPE_3 = 0x04,   AES_COUNTERMEASURE_TYPE_4 = 0x08,   AES_COUNTERMEASURE_TYPE_ALL = 0x0F }
	AES CounterMeasure type. More...
enum	aes_dma_mode {   AES_MANUAL_MODE = 0,   AES_DMA_MODE }
	AES DMA mode. More...
enum	aes_encrypt_mode {   AES_DECRYPTION = 0,   AES_ENCRYPTION }
	AES Processing mode. More...
enum	aes_interrupt_source {   AES_INTERRUPT_INPUT_BUFFER_READY = AESA_IER_ODATARDY,   AES_INTERRUPT_OUTPUT_DATA_READY = AESA_IER_IBUFRDY }
	AES interrupt source type. More...
enum	aes_key_size {   AES_KEY_SIZE_128 = 0,   AES_KEY_SIZE_192,   AES_KEY_SIZE_256 }
	AES Cryptographic key size. More...
enum	aes_opmode {   AES_ECB_MODE = 0,   AES_CBC_MODE,   AES_OFB_MODE,   AES_CFB_MODE,   AES_CTR_MODE }
	AES Confidentiality mode. More...

Functions
static void	aes_decryption_key_generate (struct aes_dev_inst *const dev_inst)
	Starts the computation of the last Nk words of the expanded key. More...
void	aes_disable (struct aes_dev_inst *const dev_inst)
	Disable the AES. More...
static void	aes_disable_interrupt (struct aes_dev_inst *const dev_inst, aes_interrupt_source_t source)
	Disable the AES interrupt. More...
void	aes_enable (struct aes_dev_inst *const dev_inst)
	Enable the AES. More...
static void	aes_enable_interrupt (struct aes_dev_inst *const dev_inst, aes_interrupt_source_t source)
	Enable the AES interrupt. More...
void	aes_get_config_defaults (struct aes_config *const cfg)
	Initializes a AES configuration structure to defaults. More...
bool	aes_init (struct aes_dev_inst *const dev_inst, Aesa *const aes, struct aes_config *const cfg)
	Initialize the AES module. More...
static uint32_t	aes_read_input_buffer_pointer (struct aes_dev_inst *const dev_inst)
	Read the input buffer pointer position. More...
static uint32_t	aes_read_interrupt_mask (struct aes_dev_inst *const dev_inst)
	Get the AES interrupt mask status. More...
static uint32_t	aes_read_output_buffer_pointer (struct aes_dev_inst *const dev_inst)
	Read the output buffer pointer position. More...
static uint32_t	aes_read_output_data (struct aes_dev_inst *const dev_inst)
	Read the output data. More...
static uint32_t	aes_read_status (struct aes_dev_inst *const dev_inst)
	Get the AES status. More...
static void	aes_reset (struct aes_dev_inst *const dev_inst)
	Perform a software reset of the AES. More...
void	aes_set_callback (struct aes_dev_inst *const dev_inst, aes_interrupt_source_t source, aes_callback_t callback, uint8_t irq_level)
	Set callback for AES. More...
static void	aes_set_config (struct aes_dev_inst *const dev_inst)
	Configure the AES. More...
static void	aes_set_new_message (struct aes_dev_inst *const dev_inst)
	Notifies the module that the next input data block is the beginning of a new message. More...
static void	aes_write_drng_seed (struct aes_dev_inst *const dev_inst, uint32_t ul_drng_seed)
	Write the DRNG seed. More...
void	aes_write_initvector (struct aes_dev_inst *const dev_inst, const uint32_t *p_vector)
	Write the initialization vector (for the CBC, CFB, OFB & CTR cipher modes) More...
static void	aes_write_input_buffer_pointer (struct aes_dev_inst *const dev_inst, uint32_t ul_in_position)
	Write the input buffer pointer position. More...
static void	aes_write_input_data (struct aes_dev_inst *const dev_inst, uint32_t ul_data)
	Write the input data. More...
void	aes_write_key (struct aes_dev_inst *const dev_inst, const uint32_t *p_key)
	Write the 128/192/256bit cryptographic key. More...
static void	aes_write_output_buffer_pointer (struct aes_dev_inst *const dev_inst, uint32_t ul_out_position)
	Write the output buffer pointer position. More...

typedef void(* aes_callback_t)(void)

Interrupt callback function type for AES.

The interrupt handler can be configured to do a function callback, the callback function must match the aes_callback_t type.

typedef enum aes_interrupt_source aes_interrupt_source_t

AES interrupt source type.

enum aes_cfb_size

AES CFB size.

Enumerator
AES_CFB_SIZE_128
AES_CFB_SIZE_64
AES_CFB_SIZE_32
AES_CFB_SIZE_16
AES_CFB_SIZE_8

enum aes_countermeature_type

AES CounterMeasure type.

Enumerator
AES_COUNTERMEASURE_TYPE_1
AES_COUNTERMEASURE_TYPE_2
AES_COUNTERMEASURE_TYPE_3
AES_COUNTERMEASURE_TYPE_4
AES_COUNTERMEASURE_TYPE_ALL

enum aes_dma_mode

AES DMA mode.

Enumerator
AES_MANUAL_MODE
AES_DMA_MODE

enum aes_encrypt_mode

AES Processing mode.

Enumerator
AES_DECRYPTION
AES_ENCRYPTION

enum aes_interrupt_source

AES interrupt source type.

Enumerator
AES_INTERRUPT_INPUT_BUFFER_READY
AES_INTERRUPT_OUTPUT_DATA_READY

enum aes_key_size

AES Cryptographic key size.

Enumerator
AES_KEY_SIZE_128
AES_KEY_SIZE_192
AES_KEY_SIZE_256

enum aes_opmode

AES Confidentiality mode.

Enumerator
AES_ECB_MODE
AES_CBC_MODE
AES_OFB_MODE
AES_CFB_MODE
AES_CTR_MODE

static void aes_decryption_key_generate ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Starts the computation of the last Nk words of the expanded key.

Parameters

dev_inst

Device structure pointer.

References aes_dev_inst::hw_dev.

void aes_disable

(

struct aes_dev_inst *const

dev_inst

)

Disable the AES.

Parameters

dev_inst

Device structure pointer.

References aes_dev_inst::hw_dev, SLEEPMGR_SLEEP_0, sleepmgr_unlock_mode(), and sysclk_disable_peripheral_clock().

static void aes_disable_interrupt ( struct aes_dev_inst *const  dev_inst, aes_interrupt_source_t  source  )

inlinestatic

Disable the AES interrupt.

Parameters

dev_inst	Device structure pointer.
source	Interrupt source.

References aes_dev_inst::hw_dev.

void aes_enable

(

struct aes_dev_inst *const

dev_inst

)

Enable the AES.

Parameters

dev_inst

Device structure pointer.

References CONFIG_AESA_GENERIC_DIV, CONFIG_AESA_GENERIC_SRC, genclk_config_defaults(), genclk_config_set_divider(), genclk_config_set_source(), genclk_enable(), genclk_enable_source(), aes_dev_inst::hw_dev, sleepmgr_lock_mode(), SLEEPMGR_SLEEP_0, and sysclk_enable_peripheral_clock().

Referenced by main().

static void aes_enable_interrupt ( struct aes_dev_inst *const  dev_inst, aes_interrupt_source_t  source  )

inlinestatic

Enable the AES interrupt.

Parameters

dev_inst	Device structure pointer.
source	Interrupt source.

References aes_dev_inst::hw_dev.

Referenced by aes_set_callback().

void aes_get_config_defaults

(

struct aes_config *const

cfg

)

Initializes a AES configuration structure to defaults.

Initializes a given AES configuration structure to a set of known default values. This function should be called on all new instances of these configuration structures before being modified by the user application.

The default configuration is as follows:

• Encryption.
• 128 key size.
• Manual mode.
• ECB mode.
• Countermeasure.

Parameters

cfg	Configuration structure to initialize to default values.

References AES_CFB_SIZE_128, AES_COUNTERMEASURE_TYPE_ALL, AES_ECB_MODE, AES_ENCRYPTION, AES_KEY_SIZE_128, AES_MANUAL_MODE, Assert, aes_config::cfb_size, aes_config::countermeasure_mask, aes_config::dma_mode, aes_config::encrypt_mode, aes_config::key_size, and aes_config::opmode.

Referenced by main().

bool aes_init	(	struct aes_dev_inst *const	dev_inst,
		Aesa *const	aesa,
		struct aes_config *const	cfg
	)

Initialize the AES module.

Parameters

dev_inst	Device structure pointer.
aesa	Base address of the AESA instance.
cfg	Pointer to AES configuration.

Return values

true	if the initialization was successful.
false	if initialization failed.

References aes_dev_inst::aes_cfg, aes_set_config(), Assert, aes_dev_inst::hw_dev, sysclk_disable_peripheral_clock(), and sysclk_enable_peripheral_clock().

Referenced by main().

static uint32_t aes_read_input_buffer_pointer ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Read the input buffer pointer position.

Parameters

dev_inst

Device structure pointer.

Returns

the input buffer pointer position.

References aes_dev_inst::hw_dev.

static uint32_t aes_read_interrupt_mask ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Get the AES interrupt mask status.

Parameters

dev_inst

Device structure pointer.

Returns

the content of the interrupt mask register.

References aes_dev_inst::hw_dev.

static uint32_t aes_read_output_buffer_pointer ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Read the output buffer pointer position.

Parameters

dev_inst

Device structure pointer.

Returns

the output buffer pointer position.

References aes_dev_inst::hw_dev.

static uint32_t aes_read_output_data ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Read the output data.

Parameters

dev_inst

Device structure pointer.

Returns

the output data.

References aes_dev_inst::hw_dev.

Referenced by aes_callback().

static uint32_t aes_read_status ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Get the AES status.

Parameters

dev_inst

Device structure pointer.

Returns

the content of the status register.

References aes_dev_inst::hw_dev.

static void aes_reset ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Perform a software reset of the AES.

Parameters

dev_inst

Device structure pointer.

References aes_dev_inst::hw_dev.

void aes_set_callback	(	struct aes_dev_inst *const	dev_inst,
		aes_interrupt_source_t	source,
		aes_callback_t	callback,
		uint8_t	irq_level
	)

Set callback for AES.

Parameters

dev_inst	Device structure pointer.
source	Interrupt source.
callback	callback function pointer.
irq_level	interrupt level.

References aes_callback_pointer, aes_enable_interrupt(), and irq_register_handler.

Referenced by ecb_mode_test_pdca(), and main().

static void aes_set_config ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Configure the AES.

Parameters

dev_inst

Device structure pointer.

References aes_dev_inst::aes_cfg, aes_config::cfb_size, aes_config::countermeasure_mask, aes_config::dma_mode, aes_config::encrypt_mode, aes_dev_inst::hw_dev, aes_config::key_size, and aes_config::opmode.

Referenced by aes_init(), cbc_mode_test(), cfb128_mode_test(), ctr_mode_test(), ecb_mode_test(), ecb_mode_test_pdca(), and ofb_mode_test().

static void aes_set_new_message ( struct aes_dev_inst *const  dev_inst )

inlinestatic

Notifies the module that the next input data block is the beginning of a new message.

Parameters

dev_inst

Device structure pointer.

References aes_dev_inst::hw_dev.

Referenced by cbc_mode_test(), cfb128_mode_test(), ctr_mode_test(), ecb_mode_test(), ecb_mode_test_pdca(), and ofb_mode_test().

static void aes_write_drng_seed ( struct aes_dev_inst *const  dev_inst, uint32_t  ul_drng_seed  )

inlinestatic

Write the DRNG seed.

Parameters

dev_inst	Device structure pointer.
ul_drng_seed	DRNG seed.

References aes_dev_inst::hw_dev.

void aes_write_initvector	(	struct aes_dev_inst *const	dev_inst,
		const uint32_t *	p_vector
	)

Write the initialization vector (for the CBC, CFB, OFB & CTR cipher modes)

Parameters

dev_inst	Device structure pointer.
*p_vector	Pointer on 4 contiguous 32bit words.

References aes_dev_inst::hw_dev.

Referenced by cbc_mode_test(), cfb128_mode_test(), ctr_mode_test(), and ofb_mode_test().

static void aes_write_input_buffer_pointer ( struct aes_dev_inst *const  dev_inst, uint32_t  ul_in_position  )

inlinestatic

Write the input buffer pointer position.

Parameters

dev_inst	Device structure pointer.
ul_in_position	Input buffer pointer position.

References aes_dev_inst::hw_dev.

static void aes_write_input_data ( struct aes_dev_inst *const  dev_inst, uint32_t  ul_data  )

inlinestatic

Write the input data.

Parameters

dev_inst	Device structure pointer.
ul_data	Input data.

References aes_dev_inst::hw_dev.

Referenced by cbc_mode_test(), cfb128_mode_test(), ctr_mode_test(), ecb_mode_test(), and ofb_mode_test().

void aes_write_key	(	struct aes_dev_inst *const	dev_inst,
		const uint32_t *	p_key
	)

Write the 128/192/256bit cryptographic key.

Parameters

dev_inst	Device structure pointer.
*p_key	Pointer on 4/6/8 contiguous 32bit words.

Note

The key size depends on the AES configuration.

References aes_dev_inst::hw_dev.

Referenced by cbc_mode_test(), cfb128_mode_test(), ctr_mode_test(), ecb_mode_test(), ecb_mode_test_pdca(), and ofb_mode_test().

static void aes_write_output_buffer_pointer ( struct aes_dev_inst *const  dev_inst, uint32_t  ul_out_position  )

inlinestatic

Write the output buffer pointer position.

Parameters

dev_inst	Device structure pointer.
ul_out_position	Output buffer pointer position.

References aes_dev_inst::hw_dev.