man BN_copy () - copy BIGNUMs
NAME
BN_copy, BN_dup - copy BIGNUMs
SYNOPSIS
#include <openssl/bn.h>
BIGNUM *BN_copy(BIGNUM *to, const BIGNUM *from);
BIGNUM *BN_dup(const BIGNUM *from);
DESCRIPTION
BN_copy() copies from to to. BN_dup() creates a new BIGNUM containing the value from.
RETURN VALUES
BN_copy() returns to on success, NULL on error. BN_dup() returns the new BIGNUM, and NULL on error. The error codes can be obtained by ERR_get_error(3).
SEE ALSO
bn(3), ERR_get_error(3)
HISTORY
BN_copy() and BN_dup() are available in all versions of SSLeay and OpenSSL.