I am currently working on writing an openssl engine
to interface with a piece of hardware.

I am trying to understand how to implement
rsa key generation, where the private key
bytes would not be available.

I am currently invoking the
command:

openssl genrsa -engine foo

Which is calling my callback for RSA keygen, registered via ENGINE_set_RSA()
and I set the flags: RSA_FLAG_EXT_PKEY.

However, genrsa app seems to want rsa->e set here:
https://github.com/openssl/openssl/blob/OpenSSL_1_0_2g/apps/genrsa.c#L291

I can't find documentation on how to handle the keygen interface
for RSA.

Can someone point me in the right direction?

Thanks,
Bill
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