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+.\" ========================================================================
+.\"
+.IX Title "DH_SIZE 3"
+.TH DH_SIZE 3 "2019-09-10" "1.1.1d" "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"
+DH_size, DH_bits, DH_security_bits \- get Diffie\-Hellman prime size and security bits
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/dh.h>
+\&
+\& int DH_size(const DH *dh);
+\&
+\& int DH_bits(const DH *dh);
+\&
+\& int DH_security_bits(const DH *dh);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fBDH_size()\fR returns the Diffie-Hellman prime size in bytes. It can be used
+to determine how much memory must be allocated for the shared secret
+computed by \fBDH_compute_key\fR\|(3).
+.PP
+\&\fBDH_bits()\fR returns the number of significant bits.
+.PP
+\&\fBdh\fR and \fBdh\->p\fR must not be \fB\s-1NULL\s0\fR.
+.PP
+\&\fBDH_security_bits()\fR returns the number of security bits of the given \fBdh\fR
+key. See \fBBN_security_bits\fR\|(3).
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBDH_size()\fR returns the prime size of Diffie-Hellman in bytes.
+.PP
+\&\fBDH_bits()\fR returns the number of bits in the key.
+.PP
+\&\fBDH_security_bits()\fR returns the number of security bits.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBDH_new\fR\|(3), \fBDH_generate_key\fR\|(3),
+\&\fBBN_num_bits\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+The \fBDH_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>.