RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or security bits
#include <openssl/rsa.h>
int RSA_bits(const RSA *rsa);
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
int RSA_size(const RSA *rsa);
int RSA_security_bits(const RSA *rsa);
RSA_bits() returns the number of significant bits.
rsa and
rsa->n must not be
NULL.
The remaining functions described on this page are deprecated. Applications
should instead use
EVP_PKEY_get_size(3),
EVP_PKEY_get_bits(3)
and
EVP_PKEY_get_security_bits(3).
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_security_bits() returns the number of security bits of the given
rsa key. See
BN_security_bits(3).
RSA_bits() returns the number of bits in the key.
RSA_size() returns the size of modulus in bytes.
RSA_security_bits() returns the number of security bits.
BN_num_bits(3)
The
RSA_size() and
RSA_security_bits() functions were deprecated
in OpenSSL 3.0.
The
RSA_bits() function was added in OpenSSL 1.1.0.
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy in the
file LICENSE in the source distribution or at
<
https://www.openssl.org/source/license.html>.