[openssl-dev] Guidance on browsing code base

[Benjamin Kaduk]

On 10/23/2015 04:27 PM, Fan Zhang wrote:
> Hi, all,
>
> Happy to meet your guys by this email. I’m trying to dig into the code base and find an implementation of RSA signature. Naturally, I looked into the function `int RSA_sign` in file `crypto/rsa/rsa_sign.c`, which further calls the `RSA_private_encrypt` and `RSA_private_encrypt` calls the method `rsa_priv_enc` in `rsa->meth`.
>
> 83 int RSA_private_encrypt(int flen, const unsigned char *from,
> 84                         unsigned char *to, RSA *rsa, int padding)
> 85 {
> 86     return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
> 87 }
>
> After this, I got lost. I couldn't find when `rsa->meth` is initialized. Or maybe more directly, where is the actual code implementing the `rsa_priv_enc`? Thanks in advance!
>

*rsa->meth is of type RSA_METHOD, which is a thing to search for.

In particular, check out crypto/rsa/rsa_eay.c.

-Ben Kaduk