tree 35d27bf867ecad37676adcd4c78075c89635564e
parent 9c68f9de633fcf844e81dabbadf316ae1cbe92b3
author Channagoud Kadabi <ckadabi@codeaurora.org> 1441749309 -0700
committer Channagoud Kadabi <ckadabi@codeaurora.org> 1442429020 -0700

platform: msm_shared: Validate the decrypted signature

For a successful boot image authentication, the RSA decrypt api returns the
size of ASN1 encoded signature (PKCS#1 magic + sha256), compare the size
returned by RSA decrypt API with size of ASN1 if they match the signature is
valid otherwise fail with an error. This check avoids vulnerability due to
trailing data placed at the end of digest.

Change-Id: Ib7077efce6369a253b09a0def8e53d035ee345b8