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my $string = priv_key($DH_private);
my $string = Crypt::DH::GMP::priv_key($DH_private);
char * PerlCryptDHGMP_priv_key( PerlCryptDHGMP *dh ) { return PerlCryptDHGMP_mpz2sv_str(PerlCryptDHGMP_PRIVKEY_PTR(dh), 1 +0, NULL); }