=head1 NAME

Crypt::OpenSSL::EVP::MD - OpenSSL EVP_MD

=head1 SYNOPSIS

    use Crypt::OpenSSL::EVP::MD;

    my $hash_name = 'SHA256';
    my $md = Crypt::OpenSSL::EVP::MD->new( $hash_name );

    my $block_size = $md->block_size();
    my $size = $md->size();

    my $msg = 'abc';
    my $dgst = $md->digest($msg);

=head1 DESCRIPTION

=over

=item new($hash_name)

 my $md = Crypt::OpenSSL::EVP::MD->new($hash_name);

=item size()

same with EVP_MD_size();

  my $size = $md->size();


=item block_size()

same with EVP_MD_block_size();

    my $block_size = $md->block_size();

=item digest($msg)

the digest of $msg

    my $msg = 'abc';
    my $dgst = $md->digest($msg);

=back

=head1 SEE ALSO

L<Crypt::OpenSSL::Bignum>

=cut