Validate x509 (SSL) Certs and Keys using Modulus

check.sh

for i in `ls -1 *.key`; do 
  cert=`echo $i |sed -e 's/\.key//'`; 
  c=$((\
    openssl x509 -noout -modulus -in "${cert}.crt" 2>/dev/null| \
      openssl md5; \
    openssl rsa -noout -modulus -in "${cert}.key" 2>/dev/null| \
      openssl md5)\
  |uniq \
    |wc -l);
  test $c -gt 1 && \
    (echo "Validation failed for: ${cert}" && exit 0) \
      || \
    echo "Validation succeeded for: ${cert}"; 
done

output

Validation failed for: BLAH.com
Validation succeeded for: buttsec.org