RSA_SIZE(3)                Library Functions Manual                RSA_SIZE(3)

NAME
     RSA_size, RSA_bits - get the RSA modulus size

SYNOPSIS
     #include <openssl/rsa.h>

     int
     RSA_size(const RSA *rsa);

     int
     RSA_bits(const RSA *rsa);

DESCRIPTION
     RSA_size() 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_bits() returns the number of significant bits.

     rsa and rsa->n must not be NULL.

RETURN VALUES
     The size.

SEE ALSO
     BN_num_bits(3), RSA_get0_key(3), RSA_new(3), RSA_security_bits(3)

HISTORY
     RSA_size() first appeared in SSLeay 0.4.4 and has been available since
     OpenBSD 2.4.

     RSA_bits() first appeared in OpenSSL 1.1.0 and has been available since
     OpenBSD 6.3.

Linux 6.8.7-arch1-1              July 13, 2022             Linux 6.8.7-arch1-1