View the most recent changes for the dumpasn1 port at: dumpasn1.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for dumpasn1.
The raw portfile for dumpasn1 20060622 is located here:
http://dumpasn1.darwinports.com/dports/textproc/dumpasn1/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/dumpasn1

The dumpasn1 Portfile 50980 2009-05-14 19:41:55Z and.damore macports.org $

PortSystem 1.0
Name: dumpasn1
Version: 20060622
Category: textproc security
Maintainers: cjr
Description: an ASN.1 decoder and pretty-printer
Long Description: The dumpasn1 program decodes BER and DER-encoded ASN.1 data, and is configured with knowledge of many security-related objects.
Homepage: http://www.cs.auckland.ac.nz/~pgut001/
Master Sites: ${homepage}
distname
distfiles dumpasn1.c dumpasn1.cfg
Checksums: dumpasn1.c md5 0855c6f21a9e2c7f984b1e48ce9c1f58 dumpasn1.cfg md5 ffb5d3c3f7b5216149dcc7bbf462408c
Platform: darwin
extract {
system "cp ${distpath}/dumpasn1.c ${worksrcpath}"
system "cp ${distpath}/dumpasn1.cfg ${worksrcpath}"
}

configure {}

post-configure {
reinplace "s|/etc/dumpasn1/|$prefix/etc/|g" "${worksrcpath}/dumpasn1.c"
}

build {
system "cc -o ${worksrcpath}/dumpasn1 ${worksrcpath}/dumpasn1.c"
}

destroot {
xinstall -c -m 0755 ${worksrcpath}/dumpasn1 ${destroot}${prefix}/bin/dumpasn1
xinstall -c -m 0644 ${worksrcpath}/dumpasn1.cfg ${destroot}${prefix}/etc/dumpasn1.cfg
}

If you haven't already installed Darwin Ports, you can find easy instructions for doing so at the main Darwin Ports page.
Once Darwin Ports has been installed, in a terminal window and while online, type the following and hit return:

%  cd /opt/local/bin/portslocation/dports/dumpasn1
%  sudo port install dumpasn1  
Password: 

You will then be prompted for your root password, which you should enter. You may have to wait for a few minutes while the software is retrieved from the network and installed for you. Y ou should see something that looks similar to:

--->  Fetching dumpasn1
--->  Verifying checksum for dumpasn1
--->  Extracting dumpasn1
--->  Configuring dumpasn1
--->  Building dumpasn1 with target all

--->  Staging dumpasn1 into destroot

--->  Installing dumpasn1

- Make sure that you do not close the terminal window while Darwin Ports is working. Once the software has been installed, you can find further information about using dumpasn1 with these commands:

%  man dumpasn1
%  apropos dumpasn1
%  which dumpasn1
%  locate dumpasn1

 Where to find more information: