[dice] Move DiceKeypairFromSeed wrapper to diced_open_dice
This cl moves DiceKeypairFromSeed wrapper to diced_open_dice
and removes the crate diced_open_dice_cbor as it doesn't have
any code after moving out the function.
This cl also sets the type of PrivateKey and PrivateKeySeed to
struct so that their memory will be zeroed out when the struct
variable is dropped for security consideration. This is not
a complete solution for securing the sensitive data access: we
will clean up the memory cache of the sensitive data in a
follow-up cl.
Bug: 267575445
Test: atest diced_utils_test diced_sample_inputs_test \
diced_vendor_test diced_open_dice_cbor_test \
libdiced_open_dice_nostd.integration_test \
libdiced_open_dice.integration_test diced_open_dice_cbor_test
Change-Id: I6c9b1190bfc4238adc59b88b6f3ee8fdd5cbd8f0
10 files changed