First, check the local keystore file (assuming the keystore has a password).

Command: keytool? -list -v -keystore target file path

Second, check the signatures of third-party applications or system applications.

Right-click apk to decompress. The target file is a certificate. RSA file, and view the certificate information through the command keytool.exe.

Can I check the MD5, SHA 1, SHA256 values of the signature and the signature algorithm?

Command: keytool? -printcert？ Documents? Target file path