telnet/libtelnet/enc_des.c

497 void fb64_stream_iv(DES_cblock seed, struct stinfo *stp)
500 	memcpy(stp->str_iv, seed,sizeof(DES_cblock));
501 	memcpy(stp->str_output, seed, sizeof(DES_cblock));
503 	DES_set_key_checked(&stp->str_ikey, &stp->str_sched);
505 	stp->str_index = sizeof(DES_cblock);
508 void fb64_stream_key(DES_cblock key, struct stinfo *stp)
510 	memcpy(stp->str_ikey, key, sizeof(DES_cblock));
511 	DES_set_key_checked((DES_cblock*)key, &stp->str_sched);
513 	memcpy(stp->str_output, stp->str_iv, sizeof(DES_cblock));
515 	stp->str_index = sizeof(DES_cblock);
542 	struct stinfo *stp = &fb[CFB].streams[DIR_ENCRYPT-1];
545 	index = stp->str_index;
549 			DES_ecb_encrypt(&stp->str_output, &b,&stp->str_sched, 1);
550 			memcpy(stp->str_feed, b, sizeof(DES_cblock));
555 		*s = stp->str_output[index] = (stp->str_feed[index] ^ *s);
559 	stp->str_index = index;
564 	struct stinfo *stp = &fb[CFB].streams[DIR_DECRYPT-1];
573 		if (stp->str_index)
574 			--stp->str_index;
578 	index = stp->str_index++;
581 		DES_ecb_encrypt(&stp->str_output,&b, &stp->str_sched, 1);
582 		memcpy(stp->str_feed, b, sizeof(DES_cblock));
583 		stp->str_index = 1;	/* Next time will be 1 */
588 	stp->str_output[index] = data;
589 	return(data ^ stp->str_feed[index]);
614 	struct stinfo *stp = &fb[OFB].streams[DIR_ENCRYPT-1];
617 	index = stp->str_index;
621 			DES_ecb_encrypt(&stp->str_feed,&b, &stp->str_sched, 1);
622 			memcpy(stp->str_feed, b, sizeof(DES_cblock));
625 		*s++ ^= stp->str_feed[index];
628 	stp->str_index = index;
633 	struct stinfo *stp = &fb[OFB].streams[DIR_DECRYPT-1];
642 		if (stp->str_index)
643 			--stp->str_index;
647 	index = stp->str_index++;
650 		DES_ecb_encrypt(&stp->str_feed,&b,&stp->str_sched, 1);
651 		memcpy(stp->str_feed, b, sizeof(DES_cblock));
652 		stp->str_index = 1;	/* Next time will be 1 */
656 	return(data ^ stp->str_feed[index]);