For RPM packages, there is no separate signature. RPM packages have a built-in GPG signature and MD5 checksum. You can verify a package by running the following command:
shell> rpm --checksig package_name.rpm
Example:
shell> rpm --checksig MySQL-server-5.4.3-0.glibc23.i386.rpm
MySQL-server-5.4.3-0.glibc23.i386.rpm: md5 gpg OK
            If you are using RPM 4.1 and it complains about
            (GPG) NOT OK (MISSING KEYS:
            GPG#5072e1f5), even though you have imported the
            MySQL public build key into your own GPG keyring, you need
            to import the key into the RPM keyring first. RPM 4.1 no
            longer uses your personal GPG keyring (or GPG itself).
            Rather, it maintains its own keyring because it is a
            system-wide application and a user's GPG public keyring is a
            user-specific file. To import the MySQL public key into the
            RPM keyring, first obtain the key as described in
            Section 2.1.4.2, “Signature Checking Using GnuPG”. Then use
            rpm --import to import the key. For
            example, if you have saved the public key in a file named
            mysql_pubkey.asc, import it using this
            command:
          
shell> rpm --import mysql_pubkey.asc
          If you need to obtain the MySQL public key, see
          Section 2.1.4.2, “Signature Checking Using GnuPG”.
        

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