chap.h

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#ifndef _IPXE_CHAP_H
#define _IPXE_CHAP_H

/** @file
 *
 * CHAP protocol
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>
#include <ipxe/md5.h>

struct digest_algorithm;

/** A CHAP response */
struct chap_response {
        /** Digest algorithm used for the response */
        struct digest_algorithm *digest;
        /** Context used by the digest algorithm */
        uint8_t *digest_context;
        /** CHAP response */
        uint8_t *response;
        /** Length of CHAP response */
        size_t response_len;
};

extern int chap_init ( struct chap_response *chap,
                       struct digest_algorithm *digest );
extern void chap_update ( struct chap_response *chap, const void *data,
                          size_t len );
extern void chap_respond ( struct chap_response *chap );
extern void chap_finish ( struct chap_response *chap );

/**
 * Add identifier data to the CHAP challenge
 *
 * @v chap              CHAP response
 * @v identifier        CHAP identifier
 *
 * The CHAP identifier is the first byte of the CHAP challenge.  This
 * function is a notational convenience for calling chap_update() for
 * the identifier byte.
 */
static inline void chap_set_identifier ( struct chap_response *chap,
                                         unsigned int identifier ) {
        uint8_t ident_byte = identifier;

        chap_update ( chap, &ident_byte, sizeof ( ident_byte ) );
}

#endif /* _IPXE_CHAP_H */