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Friday, 14 March 2014

OpenSSL: Decode Certificate Signing Request (CSR)

To decode a certificate signing request (CSR):

Copy or move the csr file to C:\

Download and install OpenSSL from http://sourceforge.net/projects/gnuwin32/files/openssl/
For example: openssl-0.9.8h-1-setup.exe

Open a command prompt and change to the following directory:

cd "C:\Program Files (x86)\GnuWin32\bin"

Run the following command:

openssl req -config "C:\Program Files (x86)\GnuWin32\share\openssl.cnf" -in c:\certrequest.csr -noout -text

If decoding an Exchange Server CSR you may the following message: unable to load X509 request

Edit the csr file to remove the blank line at the end of the request.

AbcDEFGhI1jkL2mNOPQ3RsTUVw4xY5z
AbcDEFGhI1jkL2mNOPQ3RsTUVw4xY5z
AbcDEFGhI1jkL2mNOPQ3RsTUVw4xY5z

-----END NEW CERTIFICATE REQUEST-----

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