Getting certificate details from an apk

Question

How do i go about getting the details of the certificate an apk was signed with. I have a bunch of apks signed with different certificate and I am trying to group them based

Answer 1

Based on the existing answers, here's the command line for on-the-fly usage of openssl (unzip & pipe the cert instead of defining an -infile option):

unzip -p App.apk META-INF/CERT.RSA |openssl pkcs7 -inform DER -noout -print_certs -text