RSA_sign() signs the message digest B<m> of size B<m_len> using the
private key B<rsa> as specified in PKCS #1 v2.0. It stores the
signature in B<sigret> and the signature size in B<siglen>. B<sigret>
-must point to B<RSA_size(rsa)> bytes of memory.
+must point to RSA_size(B<rsa>) bytes of memory.
B<type> denotes the message digest algorithm that was used to generate
B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;