SE - Secure Element#

SE_Response_t#

typedef uint32_t SE_Response_t

Possible responses to a command.

SE_addDataInput#

void SE_addDataInput (SE_Command_t * command, SE_DataTransfer_t * data)

Add input data to a command.

This function adds a buffer of input data to the given SE command structure The buffer gets appended by reference at the end of the list of already added buffers.

Note

• Note that this function does not copy either the data buffer or the buffer structure, so make sure to keep the data object in scope until the command has been executed by the secure element.

SE_addDataOutput#

void SE_addDataOutput (SE_Command_t * command, SE_DataTransfer_t * data)

Add output data to a command.

This function adds a buffer of output data to the given command structure The buffer gets appended by reference at the end of the list of already added buffers.

Note

• Note that this function does not copy either the data buffer or the buffer structure, so make sure to keep the data object in scope until the command has been executed by the secure element.

SE_addParameter#

void SE_addParameter (SE_Command_t * command, uint32_t parameter)

Add a parameter to a command.

This function adds a parameter word to the passed command.

Note

• Make sure to not exceed SE_MAX_PARAMETERS.

SE_executeCommand#

void SE_executeCommand (SE_Command_t * command)

Execute the passed command.

This function starts the execution of the passed command by the secure element. When started, wait for the RXINT interrupt flag, or call SE_waitCommandCompletion to busy-wait. After completion, you have to call SE_readCommandResponse to get the command's execution status.

SE_getVersion#

SE_Response_t SE_getVersion (uint32_t * version)

Get current SE version.

This function returns the current VSE version

Returns

• One of the SE_RESPONSE return codes: SE_RESPONSE_OK when the command was executed successfully SE_RESPONSE_INVALID_PARAMETER when an invalid parameter was passed SE_RESPONSE_MAILBOX_INVALID when the mailbox content is invalid

SE_getConfigStatusBits#

SE_Response_t SE_getConfigStatusBits (uint32_t * cfgStatus)

Get VSE configuration and status bits.

This function returns the current VSE configuration and status bits. The following list explains what the different bits in cfgStatus indicate. A bit value of 1 means enabled, while 0 means disabled:

• [0]: Secure boot

• [1]: Verify secure boot certificate

• [2]: Anti-rollback

• [3]: Narrow page lock

• [4]: Full page lock The following status bits can be read with VSE versions higher than 1.2.2.

• [10]: Debug port lock

• [11]: Device erase enabled

• [12]: Secure debug enabled

• [15]: Debug port register state, 1 if the debug port is locked.

Note

• This function will check that the mailbox content is valid before reading the status bits. If the command response has already been read with a call to SE_ackCommand(), the validity check will fail, and the config status bits cannot be read before a reset has occurred.

Returns

• One of the SE_RESPONSE return codes: SE_RESPONSE_OK when the command was executed successfully SE_RESPONSE_INVALID_PARAMETER when an invalid parameter was passed SE_RESPONSE_MAILBOX_INVALID when the mailbox content is invalid

SE_getOTPVersion#

SE_Response_t SE_getOTPVersion (uint32_t * otpVersion)

Get the version number of the OTP from the status field of the output mailbox.

This function checks if the OTP version number flag is set in the output mailbox. If it is, the version number is writen to otpVersion pointer location. If not, it returns error response.

Returns

• One of the SE_RESPONSE return codes.

Return values

• SE_RESPONSE_OK: when the command was executed successfully

SE_ackCommand#

SE_Response_t SE_ackCommand (SE_Command_t * command)

Acknowledge and get status and output data of a completed command.

This function acknowledges and gets the status and output data of a completed mailbox command. The mailbox command is acknowledged by inverting all bits in the checksum (XOR with 0xFFFFFFFF). The output data is copied into the linked list of output buffers pointed to in the given command data structure.

Returns

• One of the SE_RESPONSE return codes.

Return values

• SE_RESPONSE_OK: when the command was executed successfully or a signature was successfully verified,

• SE_RESPONSE_INVALID_COMMAND: when the command ID was not recognized,

• SE_RESPONSE_AUTHORIZATION_ERROR: when the command is not authorized,

• SE_RESPONSE_INVALID_SIGNATURE: when signature verification failed,

• SE_RESPONSE_BUS_ERROR: when a bus error was thrown during the command, e.g. because of conflicting Secure/Non-Secure memory accesses,

• SE_RESPONSE_CRYPTO_ERROR: on an internal SE failure, or

• SE_RESPONSE_INVALID_PARAMETER: when an invalid parameter was passed

• SE_RESPONSE_MAILBOX_INVALID: when mailbox command not done or invalid

SE_isCommandCompleted#

bool SE_isCommandCompleted (void )

Check whether the running command has completed.

This function polls the SE-to-host mailbox interrupt flag.

Returns

• True if a command has completed and the result is available

SE_readExecutedCommand#

uint32_t SE_readExecutedCommand (void )

Read the previously executed command.

This function reads the previously executed command.

Returns

• One of the SE command words. SE_RESPONSE_MAILBOX_INVALID when the mailbox content is invalid.

SE_readCommandResponse#

SE_Response_t SE_readCommandResponse (void )

Read the status of the previously executed command.

This function reads the status of the previously executed command.

Returns

• One of the SE_RESPONSE return codes: SE_RESPONSE_OK when the command was executed successfully or a signature was successfully verified, SE_RESPONSE_INVALID_COMMAND when the command ID was not recognized, SE_RESPONSE_AUTHORIZATION_ERROR when the command is not authorized, SE_RESPONSE_INVALID_SIGNATURE when signature verification failed, SE_RESPONSE_BUS_ERROR when a bus error was thrown during the command, e.g. because of conflicting Secure/Non-Secure memory accesses, SE_RESPONSE_CRYPTO_ERROR on an internal SE failure, or SE_RESPONSE_INVALID_PARAMETER when an invalid parameter was passed SE_RESPONSE_MAILBOX_INVALID when the mailbox content is invalid

SE_waitCommandCompletion#

void SE_waitCommandCompletion (void )

Wait for completion of the current command.

This function "busy"-waits until the execution of the ongoing instruction has completed.

SE_disableInterrupt#

void SE_disableInterrupt (uint32_t flags)

Disable one or more SE interrupts.

SE_enableInterrupt#

void SE_enableInterrupt (uint32_t flags)

Enable one or more SE interrupts.

rootIsOutputMailboxValid#

bool rootIsOutputMailboxValid (void )

Check whether the VSE Output Mailbox is valid.

Returns

• True if the VSE Output Mailbox is valid (magic and checksum OK)

SE_RESPONSE_MAILBOX_INVALID#

#define SE_RESPONSE_MAILBOX_INVALID

0x00FE0000UL

Root Code Mailbox is invalid.

SE_RESPONSE_MAILBOX_VALID#

#define SE_RESPONSE_MAILBOX_VALID

0xE5ECC0DEUL

Root Code Mailbox magic word.

SE_RESPONSE_MASK#

#define SE_RESPONSE_MASK

0x000F0000UL

Response status codes for the Secure Element.

SE_RESPONSE_OK#

#define SE_RESPONSE_OK

0x00000000UL

Command executed successfully or signature was successfully validated.

SE_FIFO_MAX_PARAMETERS#

#define SE_FIFO_MAX_PARAMETERS

13U

Maximum amount of parameters supported by the hardware FIFO.

SE_DATATRANSFER_STOP#

#define SE_DATATRANSFER_STOP

0x00000001UL

Stop datatransfer.

SE_DATATRANSFER_DISCARD#

#define SE_DATATRANSFER_DISCARD

0x40000000UL

Discard datatransfer.

SE_DATATRANSFER_REALIGN#

#define SE_DATATRANSFER_REALIGN

0x20000000UL

Realign datatransfer.

SE_DATATRANSFER_CONSTADDRESS#

#define SE_DATATRANSFER_CONSTADDRESS

0x10000000UL

Datatransfer Const Address.

SE_DATATRANSFER_LENGTH_MASK#

#define SE_DATATRANSFER_LENGTH_MASK

0x0FFFFFFFUL

Stop Length Mask.

SE_MAX_PARAMETERS#

#define SE_MAX_PARAMETERS

4U

Maximum amount of parameters for largest command in defined command set.

SE_DATATRANSFER_DEFAULT#

#define SE_DATATRANSFER_DEFAULT

Default initialization of data transfer struct.

SE_COMMAND_DEFAULT#

#define SE_COMMAND_DEFAULT

Default initialization of command struct.