• David Howells's avatar
    ASN.1: Handle 'ANY OPTIONAL' in grammar · 233ce79d
    David Howells authored
    An ANY object in an ASN.1 grammar that is marked OPTIONAL should be skipped
    if there is no more data to be had.
    
    This can be tested by editing X.509 certificates or PKCS#7 messages to
    remove the NULL from subobjects that look like the following:
    
    	SEQUENCE {
    	  OBJECT(2a864886f70d01010b);
    	  NULL();
    	}
    
    This is an algorithm identifier plus an optional parameter.
    
    The modified DER can be passed to one of:
    
    	keyctl padd asymmetric "" @s </tmp/modified.x509
    	keyctl padd pkcs7_test foo @s </tmp/modified.pkcs7
    
    It should work okay with the patch and produce EBADMSG without.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Tested-by: Marcel Holtmann's avatarMarcel Holtmann <marcel@holtmann.org>
    Reviewed-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
    233ce79d
asn1_ber_bytecode.h 2.72 KB