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If you want to request a signed certificate from CAs like verisign or thawte you need to create a private key (without des3 option) and a CSR file. You can create these two files with SSLeay or with OpenSSL. If you create your private key with the -des3 option you’ll need to enter this phrase every time you restart the apache, which can be inconvenient when performing regular maintenance.

With OpenSSL:

# openssl genrsa -out server.key 1024
# openssl req -new -days 365 -key server.key -out server.csr

Check the md5 of you public key:

# openssl rsa -noout -modulus -in server.key | openssl md5

You can read the CSR file with following command:

# openssl req -noout -text -in server.csr

You must provide a CSR file for every domain you want to sign by a trusted CA. (cause the "Common Name" specify the domain)