tree f01f0e4a83dcf5de4dfbef366be74c1ce96c2b94
parent 4b02eaf79938839a492c39f6af18c2e37cb0a071
author Sandrine Bailleux <sandrine.bailleux@arm.com> 1581943319 +0100
committer Sandrine Bailleux <sandrine.bailleux@arm.com> 1582015615 +0100

TBBR: Reduce size of ECDSA key buffers

The TBBR implementation extracts public keys from certificates and
stores them in static buffers. DER-encoded ECDSA keys are only 91 bytes
each but were each allocated 294 bytes instead. Reducing the size of
these buffers saves 609 bytes of BSS in BL2 (294 - 91 = 203 bytes for
each of the 3 key buffers in use).

Also add a comment claryfing that key buffers are tailored on RSA key
sizes when both ECDSA and RSA keys are used.

Change-Id: Iad332856e7af1f9814418d012fba3e1e9399f72a
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>