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Title "RSA_SIZE 3ossl"
RSA_SIZE 3ossl "2023-09-19" "3.0.11" "OpenSSL"
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"NAME"
RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or security bits
"SYNOPSIS"
Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& int RSA_bits(const RSA *rsa); .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.Vb 1 int RSA_size(const RSA *rsa); \& int RSA_security_bits(const RSA *rsa); .Ve

"DESCRIPTION"
Header "DESCRIPTION" \fBRSA_bits() returns the number of significant bits.

\fBrsa and rsa->n must not be \s-1NULL\s0.

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).

\fBRSA_size() returns the \s-1RSA\s0 modulus size in bytes. It can be used to determine how much memory must be allocated for an \s-1RSA\s0 encrypted value.

\fBRSA_security_bits() returns the number of security bits of the given rsa key. See BN_security_bits\|(3).

"RETURN VALUES"
Header "RETURN VALUES" \fBRSA_bits() returns the number of bits in the key.

\fBRSA_size() returns the size of modulus in bytes.

\fBRSA_security_bits() returns the number of security bits.

"SEE ALSO"
Header "SEE ALSO" \fBBN_num_bits\|(3)
"HISTORY"
Header "HISTORY" 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"
Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.