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=pod
=head1 NAME
BN_num_bits, BN_num_bytes, BN_num_bits_word - get BIGNUM size
=head1 SYNOPSIS
#include <openssl/bn.h>
int BN_num_bytes(const BIGNUM *a);
int BN_num_bits(const BIGNUM *a);
int BN_num_bits_word(BN_ULONG w);
=head1 DESCRIPTION
These functions return the size of a B<BIGNUM> in bytes or bits,
and the size of an unsigned integer in bits.
BN_num_bytes() is a macro.
=head1 RETURN VALUES
The size.
=head1 SEE ALSO
L<bn(3)|bn(3)>
=head1 HISTORY
BN_num_bytes(), BN_num_bits() and BN_num_bits_word() are available in
all versions of SSLeay and OpenSSL.
=cut
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