View APK signature

1. Get original signature
obtain .keystore or .jks Digital signature information for
Use jdk Inside keytool command ：

	keytool -list -v -keystore xxx.keystore

2. obtain apk In signature
Need to get apk In the document META-INF Folder , Get one of them CERT.RSA file , There are two ways to get .1. Decompiled directories are generated META-INF Folder , Open it directly and you can see CERT.RSA The file .2. rename apk File for zip, Decompress with a compression tool , You can get META-INF Catalog .

keytool -printcert -file xxxx.RSA