SSL Howto

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A few handy hints and tips for messing with SSL certs and keys

  • Dump the certificate
openssl x509 -in url.crt
  • Dump the certificate details (-noout supresses output of the certificate itself)
openssl x509 -in url.crt -noout -text
  • Find out the issuer of a certificate (useful for determining the chain file needed)
openssl x509 -in url.crt -noout -issuer
  • Display the valid from/valid to dates
openssl x509 -in url.crt -noout -dates

Check that a key and cert match

  • Find the modulus for both the cert and the key
openssl x509 -in url.crt -noout -modulus
openssl rsa -in url.key -noout -modulus

If they match, then the key is a pair with the certificate. See also Cert-Key_Match.

Test an SSL site

openssl s_client -connect

  • Check on a csr (Certificate Signing Request)
 openssl req -noout -text -in foo.csr 

  • Generate a csr (Certificate Signing Request)

Version 9 you can use openssl

openssl req -new -out foo.csr

Versin 4.5 use genconf, which will prompt you for all information.


you will be asked to enter all the customers information (probably the same as the older scr, which can be found in '/config/ssl/ssl.csr' on big ip v9)