$ keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000 -dname "C=US, O=Android, CN=Android Debug"

A debug keystore which is used to sign an Android app during development needs a specific alias and password combination as dictated by Google.

• Keystore name: "debug.keystore"
• Keystore password: "android"
• Key alias: "androiddebugkey"
• Key password: "android"
• CN: "CN=Android Debug,O=Android,C=US"

$ keytool -genkey -v -keystore release.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000

To get the keystore certificate fingerprints you can do:

keytool -list -v -keystore [keystore path] -alias [alias-name] -storepass [storepass] -keypass [keypass] 

Ex.:

$ keytool -list -v -keystore debug.keystore -alias androiddebugkey -storepass android -keypass android 

or

$ keytool -list -v -keystore debug.keystore

$ jarsigner -verify -verbose -certs my_application.apk

1. Unzip apk
2. Get MD5 and SHA1 of certificate of APK: $ keytool -printcert -file ./META-INF/ANDROID_.RSA
3. Get MD5 and SHA1 of keystore: $ keytool -list -keystore signing-key.keystore
4. Compare MD5/SHA1 and if they are the same, so the APK was signed with signing-key.keystore.

or

Using gradle:

$ ./gradlew signingReport

• https://coderwall.com/p/r09hoq/android-generate-release-debug-keystores
• https://developer.android.com/studio/publish/app-signing.html