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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" \&\fBRSA_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 \&\fBRSA_bits()\fR returns the number of significant bits. .PP \&\fBrsa\fR and \fBrsa\->n\fR must not be \fB\s-1NULL\s0\fR. .PP \&\fBRSA_security_bits()\fR returns the number of security bits of the given \fBrsa\fR key. See \fBBN_security_bits\fR\|(3). .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRSA_size()\fR returns the size of modulus in bytes. .PP \&\fBDSA_bits()\fR returns the number of bits in the key. .PP \&\fBRSA_security_bits()\fR returns the number of security bits. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBN_num_bits\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fBRSA_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>.