RSA_size man page

RSA_size — get RSA modulus size


#include <openssl/rsa.h>
int RSA_size(const RSA *rsa);


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_size() is available in all versions of SSLeay and OpenSSL.

Referenced By

BN_num_bytes(3), BN_num_bytes.3ssl(3), rsa(3), RSA_get0_key.3ssl(3), RSA_meth_new.3ssl(3), RSA_public_encrypt(3), RSA_public_encrypt.3ssl(3).

Explore man page connections for RSA_size(3).

OpenSSL 1.0.2j 2016-09-26