STSAFE-A110 datasheet(22/36 Pages) STMICROELECTRONICS

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Command set

STSAFE-A110

22/36

DS13039 Rev 1

Command set

Echo

Returns as a response the data that it received as command data.

Reset

Interrupts any on-going session.

Generate Random

Returns the requested number of random bytes.

Hibernate

Sets the product in very-low-power consumption mode. In Hibernate mode, the device

remains powered but loses its context.Exiting from Hibernate mode can be performed by

triggering the Reset pin or through an I²C start condition. The device restart is equivalent to

a restart after a reset or Power On Reset.

Decrement

Decrements the one-way counter in a counter zone. When the counter reaches zero, the

command is refused.

Read

Used to read data from a data partition zone. It will read the data starting from the specified

offset within the zone and with the requested length. It will check the access conditions (for

example, MAC) and only return the data starting from the specified offset up to the zone

boundary.

This command can also be used to change the read access conditions of the zone to a

more stricter value.

Update

Used to update data in a zone. It checks if the written data will exceed the zone boundary

and if so, does not perform the operation. It also checks whether the access condition is

satisfied (for example, MAC) and if not, does not perform the operation.

This command can also be used to change the update access conditions of the zone to a

stricter value.

Verify Signature

This command is used for message authentication. It verifies the signature over the

message digest that is computed by the host and given to the STSAFE-A110 chip in the

command data together with the public key, the ID of the curve and the signature.

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