tree c889c946c0ecfe9b29d7cf2eeb4ba95c582fe9a7
parent 1a4d234daa26f3954633fd55037193f2827fb36c
author Tianjie Xu <xunchang@google.com> 1539211457 -0700
committer Tianjie Xu <xunchang@google.com> 1539367928 -0700

Add function to load the key from x509.pem file

We used to convert a pem certificate file to some intermediate plain
text format; and parse that format under recovery mode. This is
uncessary since the x509.pem can be directly parsed with openssl
functions.

Add the function to load the public key from one x509.pem file and
corresponding unit tests. And we will add more cls to extract the pem
files from otacert.zip later.

Bug: 116655889
Test: verify package with 5 supported certficate versions
Change-Id: Ibc6c696c534567f005db75143cc4ef8d4bdea6a0