rsakeygen.c

mobile ip 在linux下的一种实现

/* $Id: rsakeygen.c,v 1.6 2000/04/06 07:26:53 jm Exp $
 * RSA key generation tool
 *
 * Dynamic hierarchial IP tunnel
 * Copyright (C) 1998-2000, Dynamics group
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "rsa_dyn.h"
#include "message.h"
#include "md5_mac.h"
#include "util.h"

int main(int argc, char *argv[])
{
	int bits, i;
	struct msg_key *fa_public_key = NULL;
	unsigned char mac[MD5_MAC_LEN];

	if (argc != 3) {
		fprintf(stderr, "usage\n"
			"rsakeygen <keyfile name> <key len in bits>\n"
			"e.g. rsakeygen /etc/dynfad.key 768\n");
		exit(1);
	}

	bits = atoi(argv[2]);
	printf("Generating %i bits long RSA key to file %s\n", bits, argv[1]);
	if (rsa_make_key(argv[1], bits) != 0) {
		fprintf(stderr, "RSA key generation failed\n");
		exit(1);
	} else {
		printf("RSA key generated successfully\n");
	}

	/* Get the FA public key */
	i = rsa_initialize(argv[1]);
	if (i != 0) {
		fprintf(stderr, "RSA initialization failed (key file: %s, "
			"code: %i)\n", argv[1], i);
		exit(1);
	}

	fa_public_key = (struct msg_key *)
		malloc(sizeof(struct msg_key) + SPI_LEN +
		       rsa_get_public_key_len() + 1);
	if (fa_public_key == NULL) {
		fprintf(stderr, "Not enough memory for fa_public_key\n");
		exit(1);
	}
	if (rsa_get_public_key_len() + SPI_LEN > 255) {
		fprintf(stderr, "fa_public_key over 255 bytes long - does "
			"not fit into extension\n");
		exit(1);
	}
	init_key_extension(fa_public_key, VENDOR_EXT_DYNAMICS_FA_PUBKEY,
			   htonl(PUBKEY_ALG_SPI_RSA),
			   rsa_get_public_key_len());
  	memcpy(MSG_KEY_DATA(fa_public_key), rsa_get_public_key(),
  	       GET_KEY_LEN(fa_public_key));

	md5_mac((unsigned char *) "", 0, (unsigned char *) fa_public_key,
		GET_KEY_EXT_LEN(fa_public_key), mac);

	printf("RSA public key extension hash: ");
	for (i = 0; i < MD5_MAC_LEN; i++)
		printf("%02X", mac[i]);
	printf("\n");
	free(fa_public_key);

	return 0;
}