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RSA_size(3) OpenSSL RSA_size(3) NAME RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or security bits LIBRARY libcrypto, -lcrypto SYNOPSIS #include <openssl/rsa.h> int RSA_size(const RSA *rsa); int RSA_bits(const RSA *rsa); int RSA_security_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. RSA_security_bits() returns the number of security bits of the given rsa key. See BN_security_bits(3). RETURN VALUES RSA_size() returns the size of modulus in bytes. DSA_bits() returns the number of bits in the key. RSA_security_bits() returns the number of security bits. SEE ALSO BN_num_bits(3) HISTORY The RSA_bits() function was added in OpenSSL 1.1.0. COPYRIGHT Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>. 1.1.1i 2019-03-12 RSA_size(3)