get_public_key_string: Return the Base64/DER-encoded PKCS1
representation of the public key. (the DER form)
get_public_key_x509_string: Return the Base64/DER-encoded
representation of the "subject public key", suitable for use in X509
certificates. (the PEM form)
It's not entirely clear to me from RFC4871 which of those is the
correct one to use
Looking at some of the DKIM libraries, it appears that the openssl
code will accept either one, so this is underspecified. I agree that
PEM is what people typically use.
R's,
John
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