elliptic.h

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#ifndef _IPXE_ELLIPTIC_H
#define _IPXE_ELLIPTIC_H
 
/** @file
 *
 * Elliptic curves
 *
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
#include <stdint.h>
#include <ipxe/crypto.h>
 
/** An uncompressed elliptic curve point */
#define elliptic_uncompressed_t( len )                                  \
        struct {                                                        \
                uint8_t format;                                         \
                union {                                                 \
                        struct {                                        \
                                uint8_t x[ (len) ];                     \
                                uint8_t y[ (len) ];                     \
                        } __attribute__ (( packed ));                   \
                        uint8_t xy[ (len) * 2 ];                        \
                };                                                      \
        } __attribute__ (( packed ))
 
/** Format byte for uncompressed curve point representation */
#define ELLIPTIC_FORMAT_UNCOMPRESSED 0x04
 
extern int elliptic_share ( struct exchange_algorithm *exchange,
                            const void *private, void *public );
extern int elliptic_agree ( struct exchange_algorithm *exchange,
                            const void *private, const void *partner,
                            void *shared );
 
/** Define an uncompressed elliptic curve point key exchange algorithm */
#define ELLIPTIC_EXCHANGE( _name, _exchange, _len, _curve )             \
        struct exchange_algorithm _exchange = {                         \
                .name = #_name,                                         \
                .privsize = (_len),                                     \
                .pubsize = sizeof ( elliptic_uncompressed_t (_len) ),   \
                .sharedsize = (_len),                                   \
                .share = elliptic_share,                                \
                .agree = elliptic_agree,                                \
                .priv = _curve,                                         \
        }
 
#endif /* _IPXE_ELLIPTIC_H */