MODSIGN: Use PKCS#7 messages as module signatures

Move to using PKCS#7 messages as module signatures because:

 (1) We have to be able to support the use of X.509 certificates that don't
     have a subjKeyId set.  We're currently relying on this to look up the
     X.509 certificate in the trusted keyring list.

 (2) PKCS#7 message signed information blocks have a field that supplies the
     data required to match with the X.509 certificate that signed it.

 (3) The PKCS#7 certificate carries fields that specify the digest algorithm
     used to generate the signature in a standardised way and the X.509
     certificates specify the public key algorithm in a standardised way - so
     we don't need our own methods of specifying these.

 (4) We now have PKCS#7 message support in the kernel for signed kexec purposes
     and we can make use of this.

To make this work, the old sign-file script has been replaced with a program
that needs compiling in a previous patch.  The rules to build it are added
here.

Signed-off-by: David Howells <[email protected]>
Tested-by: Vivek Goyal <[email protected]>

init/Kconfig

@@ -1869,6 +1869,7 @@ config MODULE_SIG
 	select ASN1
 	select OID_REGISTRY
 	select X509_CERTIFICATE_PARSER
+	select PKCS7_MESSAGE_PARSER
 	help
 	  Check modules for valid signatures upon load: the signature
 	  is simply appended to the module. For more information see