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Using OpenSSL to check and manipulate certs.

Convert PFX to PEM

Extract the key, then the cert, from the PFX. You'll be prompted for password.

openssl pkcs12 -in MY_CERT_AND_KEY.pfx -nocerts -out MY_CERT.key
openssl pkcs12 -in MY_CERT_AND_KEY.pfx -clcerts -nokeys -out MY_CERT.crt

Validate that Cert and Key Match

If the cert and key are a pair they should generate the same hash.

openssl rsa  –noout –modulus –in MY_CERT.key | openssl md5
openssl x509 –noout –modulus –in MY_CERT.crt | openssl md5

Check a certificate

Check a certificate and return information about it (signing authority, expiration date, etc.):

openssl x509 -in MY_CERT.crt -text -noout

Check a key

Check the SSL key and verify the consistency:

openssl rsa -in server.key -check

Check a CSR

Verify the CSR and print CSR data filled in when generating the CSR:

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

Remove Passphrase from a Key

openssl rsa -in MY_CERT.key -out MY_CERT.key