rsa_size(3) - Linux man page
Name
RSA_size - get RSA modulus size
Synopsis
#include <openssl/rsa.h> int RSA_size(const RSA *rsa);
Description
This function returns the RSA modulus size in bytes. It can be used to determine how much memory must be allocated for an RSA encrypted value.
rsa->n must not be NULL .
Return Value
The size in bytes.
See Also
rsa(3)
History
RSA_size() is available in all versions of SSLeay and OpenSSL.