Signature of an APK

keytool -list -printcert -jarfile app.apk

Signature of a keystore

keytool -list -v -keystore release.jks

keytool -v -list -keystore .keystore

출처

https://stackoverflow.com/questions/11331469/how-do-i-find-out-which-keystore-was-used-to-sign-an-app

https://stackoverflow.com/questions/12893995/how-to-check-certificate-name-and-alias-in-keystore-files