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17.2. Usage
ExtJoiner does not generate an extension in its MIME-64 encoded format; it joins existing MIME-64 encoded extensions. To join multiple custom extensions and add the extensions to a certificate request using ExtJoiner, do the following:
- Find and note the location of the extension program files.
- Run
ExtJoiner, specifying the extension files. For example, if there are two extension files namedmyExt1andmyExt2in a directory called/etc/extensions, then the command would be as follows:ExtJoiner /etc/extensions/myExt1 /etc/extensions/myExt2
This creates a base-64 encoded blob of the joined extensions, similar to this example:MEwwLgYDVR0lAQHBCQwIgYFKoNFBAMGClGC5EKDM5PeXzUGBi2CVyLNCQYFU iBakowGgYDVR0SBBMwEaQPMA0xCzAJBgNVBAYTAlVT
- Copy the encoded blob, without any modifications, to a file.
- Verify that the extensions are joined correctly before adding them to a certificate request by converting the binary data to ASCII using the
AtoButility and then dumping the contents of the base-64 encoded blob using thedumpasn1utility. For information on theAtoButility, see Chapter 7, AtoB (Converting ASCII to Binary). Thedumpasn1tool can be downloaded at http://fedoraproject.org/extras/4/i386/repodata/repoview/dumpasn1-0-20050404-1.fc4.html.- Run the
AtoButility to convert the ASCII to binary.AtoB input_file output_file
where input_file is the path and file containing the base-64 encoded data in ASCII and output_file is the path and file for the utility to write the binary output. - Run the
dumpasn1utility.dumpasn1output_file
where output_file is the path and file containing the binary data. The output looks similar to this:
0 30 76: SEQUENCE { 2 30 46: SEQUENCE { 4 06 3: OBJECT IDENTIFIER extKeyUsage (2 5 29 37) 9 01 1: BOOLEAN TRUE 12 04 36: OCTET STRING : 30 22 06 05 2A 83 45 04 03 06 0A 51 82 E4 42 83 : 33 93 DE 5F 35 06 06 2D 82 57 22 CD 09 06 05 51 : 38 81 6A 4A : } 50 30 26: SEQUENCE { 52 06 3: OBJECT IDENTIFIER issuerAltName (2 5 29 18) 57 04 19: OCTET STRING : 30 11 A4 0F 30 0D 31 0B 30 09 06 03 55 04 06 13 : 02 55 53 : } : } 0 warnings, 0 errors.If the output data do not appear to be correct, check that the original Java™ extension files are correct, and repeat converting the files from ASCII to binary and dumping the data until the correct output is returned. - When the extensions have been verified, copy the base-64 encoded blob that was created by running
ExtJoinerto the Certificate System wizard screen, and generate the certificate or the certificate signing request (CSR).
