How do you test a public/private DSA keypair?

Question

Is there an easy way to verify that a given private key matches a given public key? I have a few *.puband a few *.key files, and I need to check w

Answer 1

Assuming you have the public keys inside X.509 certificates, and assuming they are RSA keys, then for each public key, do

    openssl x509 -in certfile -modulus -noout

For each private key, do

    openssl rsa -in keyfile -modulus -noout

Then match the keys by modulus.