NAME

SYNOPSIS

 #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);

DESCRIPTION

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).

RETURN VALUES

RSA_size() returns the size of modulus in bytes.

RSA_security_bits() returns the number of security bits.

SEE ALSO

HISTORY

The RSA_bits() function was added in OpenSSL 1.1.0.

COPYRIGHT

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>.