• David Howells's avatar
    KEYS: Provide signature verification with an asymmetric key · 4ae71c1d
    David Howells authored
    Provide signature verification using an asymmetric-type key to indicate the
    public key to be used.
    
    The API is a single function that can be found in crypto/public_key.h:
    
    	int verify_signature(const struct key *key,
    			     const struct public_key_signature *sig)
    
    The first argument is the appropriate key to be used and the second argument
    is the parsed signature data:
    
    	struct public_key_signature {
    		u8 *digest;
    		u16 digest_size;
    		enum pkey_hash_algo pkey_hash_algo : 8;
    		union {
    			MPI mpi[2];
    			struct {
    				MPI s;		/* m^d mod n */
    			} rsa;
    			struct {
    				MPI r;
    				MPI s;
    			} dsa;
    		};
    	};
    
    This should be filled in prior to calling the function.  The hash algorithm
    should already have been called and the hash finalised and the output should
    be in a buffer pointed to by the 'digest' member.
    
    Any extra data to be added to the hash by the hash format (eg. PGP) should
    have been added by the caller prior to finalising the hash.
    
    It is assumed that the signature is made up of a number of MPI values.  If an
    algorithm becomes available for which this is not the case, the above structure
    will have to change.
    
    It is also assumed that it will have been checked that the signature algorithm
    matches the key algorithm.
    Signed-off-by: default avatarDavid Howells <[email protected]>
    Signed-off-by: default avatarRusty Russell <[email protected]>
    4ae71c1d
Makefile 218 Bytes