When encountering certificates signed with md2/md4, make it a fatal error.

When encountering certificates signed with md5, interstitial the page with an error about md5 being a weak signing algorithm.

This excludes checking the signatures of root certificates (trust anchors), as their self-signed signatures are not relevant to the security of the chain.

R=wtc@chromium.org
BUG=101123

Review URL: http://codereview.chromium.org/8374020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114432 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed