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.\" ========================================================================
.\"
.IX Title "RSA_SIZE 3"
.TH RSA_SIZE 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
RSA_size, RSA_bits, RSA_security_bits \- get RSA modulus size or security bits
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rsa.h>
\&
\& int RSA_size(const RSA *rsa);
\&
\& int RSA_bits(const RSA *rsa);
\&
\& int RSA_security_bits(const RSA *rsa)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIRSA_size()\fR 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.
.PP
\&\fIRSA_bits()\fR returns the number of significant bits.
.PP
\&\fBrsa\fR and \fBrsa\->n\fR must not be \fB\s-1NULL\s0\fR.
.PP
\&\fIRSA_security_bits()\fR returns the number of security bits of the given \fBrsa\fR
key. See \fIBN_security_bits\fR\|(3).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIRSA_size()\fR returns the size of modulus in bytes.
.PP
\&\fIDSA_bits()\fR returns the number of bits in the key.
.PP
\&\fIRSA_security_bits()\fR returns the number of security bits.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIBN_num_bits\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fIRSA_bits()\fR function was added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

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