I have to encrypt and decrypt an RSA key using symmetrical encryption,
using RC4 or one of the other symmetrical encryption APIs. I'm working in C.
But I assume I can't just give the RSA key struct to the encryption
algorithm as input data; its members are BIGNUM pointers so the structure
has dynamic data that is not part of the struct footprint. I need to stream
the RSA struct into a continious memory byte buffer to give to the
encryption algorithm, and after decrypting this stream I need to build up
the RSA key struct from it.
Are there standard functions available for these streaming functions? Or
do I have to pull apart the pem_asn1_write/read() functions and implement my
own? Am I guaranteed that the internal structure of the RSA struct will
remain the same?
Regards,
Judith
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