telnet/libtelnet/enc_des.c

512 void fb64_stream_iv(DES_cblock seed, struct stinfo *stp)
515 	memcpy(stp->str_iv, seed,sizeof(DES_cblock));
516 	memcpy(stp->str_output, seed, sizeof(DES_cblock));
518 	DES_set_key_checked(&stp->str_ikey, &stp->str_sched);
520 	stp->str_index = sizeof(DES_cblock);
523 void fb64_stream_key(DES_cblock key, struct stinfo *stp)
525 	memcpy(stp->str_ikey, key, sizeof(DES_cblock));
526 	DES_set_key_checked((DES_cblock*)key, &stp->str_sched);
528 	memcpy(stp->str_output, stp->str_iv, sizeof(DES_cblock));
530 	stp->str_index = sizeof(DES_cblock);
557 	struct stinfo *stp = &fb[CFB].streams[DIR_ENCRYPT-1];
560 	index = stp->str_index;
564 			DES_ecb_encrypt(&stp->str_output, &b,&stp->str_sched, 1);
565 			memcpy(stp->str_feed, b, sizeof(DES_cblock));
570 		*s = stp->str_output[index] = (stp->str_feed[index] ^ *s);
574 	stp->str_index = index;
579 	struct stinfo *stp = &fb[CFB].streams[DIR_DECRYPT-1];
588 		if (stp->str_index)
589 			--stp->str_index;
593 	index = stp->str_index++;
596 		DES_ecb_encrypt(&stp->str_output,&b, &stp->str_sched, 1);
597 		memcpy(stp->str_feed, b, sizeof(DES_cblock));
598 		stp->str_index = 1;	/* Next time will be 1 */
603 	stp->str_output[index] = data;
604 	return(data ^ stp->str_feed[index]);
629 	struct stinfo *stp = &fb[OFB].streams[DIR_ENCRYPT-1];
632 	index = stp->str_index;
636 			DES_ecb_encrypt(&stp->str_feed,&b, &stp->str_sched, 1);
637 			memcpy(stp->str_feed, b, sizeof(DES_cblock));
640 		*s++ ^= stp->str_feed[index];
643 	stp->str_index = index;
648 	struct stinfo *stp = &fb[OFB].streams[DIR_DECRYPT-1];
657 		if (stp->str_index)
658 			--stp->str_index;
662 	index = stp->str_index++;
665 		DES_ecb_encrypt(&stp->str_feed,&b,&stp->str_sched, 1);
666 		memcpy(stp->str_feed, b, sizeof(DES_cblock));
667 		stp->str_index = 1;	/* Next time will be 1 */
671 	return(data ^ stp->str_feed[index]);