OpenSSL vs SPKI

[Jason Proctor]

On Mon, Apr 6, 2020 at 10:03 PM William Roberts
<bill.c.roberts at gmail.com> wrote:
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> I don't think I would consider it a hack necessarily. I work on the TPM stack and have to convert TPM structures to RSA public key structures for ooenssl to utilize, and we use this routine along the way. I would imagine theirs a higher level public from private routine you can call. I would dissect what:
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> openssl rsa -in mykey.pem -pubout > mykey.pub
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> Is doing

Thanks for the help. Turns out, d2i_PUBKEY() does exactly the thing.
The advantage over picking BIGNUMs out of the SPKI bundle is that the
code doesn't need to know the key size.