Update certificatesInBundle - addl. extensions, case sensitivity #956
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In certificatesInBundle, check for well-formed certificates with
extensiions .cer, .crt, .der, and check for upper and lower case
extensions (OSX filesystem may or may not be case sensitive. iOS
always is)
DER is a binary encoding format
PEM is an ASCII encoding format
.crt is the most common certificate extension, may be DER or PEM
.cer is a Microsoft extension convention, may be DER or PEM
.der is a (poor) extension referring to encoding instead of
contents, these may contain a certificate and/or a key.
Apple's SecCertificateCreateWithData only accepts DER-encoded certificates