ecdhe.c File Reference

Elliptic Curve Ephemeral Diffie-Hellman (ECDHE) key exchange. More...

#include <string.h>
#include <errno.h>
#include <ipxe/ecdhe.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
int	ecdhe_key (struct elliptic_curve *curve, const void *partner, const void *private, void *public, void *shared)
	Calculate ECDHE key.

Detailed Description

Elliptic Curve Ephemeral Diffie-Hellman (ECDHE) key exchange.

Definition in file ecdhe.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

ecdhe_key()

int ecdhe_key	(	struct elliptic_curve *	curve,
		const void *	partner,
		const void *	private,
		void *	public,
		void *	shared )

Calculate ECDHE key.

Parameters

curve	Elliptic curve
partner	Partner public curve point
private	Private key
public	Public curve point to fill in (may overlap partner key)
shared	Shared secret curve point to fill in

Return values

rc	Return status code

Definition at line 47 of file ecdhe.c.

                                                                  {
        int rc;
 
        /* Construct shared key */
        if ( ( rc = elliptic_multiply ( curve, partner, private,
                                        shared ) ) != 0 ) {
                DBGC ( curve, "CURVE %s could not generate shared key: %s\n",
                       curve->name, strerror ( rc ) );
                return rc;
        }
 
        /* Construct public key */
        if ( ( rc = elliptic_multiply ( curve, curve->base, private,
                                        public ) ) != 0 ) {
                DBGC ( curve, "CURVE %s could not generate public key: %s\n",
                       curve->name, strerror ( rc ) );
                return rc;
        }
 
        /* Check that partner and shared keys are not the point at infinity */
        if ( elliptic_is_infinity ( curve, shared ) ) {
                DBGC ( curve, "CURVE %s constructed point at infinity\n",
                       curve->name );
                return -EPERM;
        }
 
        return 0;
}

References elliptic_curve::base, DBGC, elliptic_is_infinity(), elliptic_multiply(), EPERM, elliptic_curve::name, partner, rc, and strerror().

Referenced by tls_send_client_key_exchange_ecdhe().