int fb64_reply(unsigned char *data, int cnt, struct fb *fbp)
{
int state = fbp->state[DIR_ENCRYPT-1];
if (cnt-- < 1)
goto failure;
switch (*data++) {
case FB64_IV_OK:
fb64_stream_iv(fbp->temp_feed, &fbp->streams[DIR_ENCRYPT-1]);
if (state == FAILED)
state = IN_PROGRESS;
state &= ~NO_RECV_IV;
encrypt_send_keyid(DIR_ENCRYPT, (unsigned char *)"\0", 1, 1);
break;
case FB64_IV_BAD:
memset(fbp->temp_feed, 0, sizeof(DES_cblock));
fb64_stream_iv(fbp->temp_feed, &fbp->streams[DIR_ENCRYPT-1]);
state = FAILED;
break;
default:
if (encrypt_debug_mode) {
printf("Unknown option type: %d\r\n", data[-1]);
printd(data, cnt);
printf("\r\n");
}
/* FALL THROUGH */
failure:
state = FAILED;
break;
}
return(fbp->state[DIR_ENCRYPT-1] = state);
}
int
fb64_is(unsigned char *data, int cnt, struct fb *fbp)
{
unsigned char *p;
int state = fbp->state[DIR_DECRYPT-1];
if (cnt-- < 1)
goto failure;
switch (*data++) {
case FB64_IV:
if (cnt != sizeof(Block)) {
if (encrypt_debug_mode)
printf("CFB64: initial vector failed on size\r\n");
state = FAILED;
goto failure;
}
if (encrypt_debug_mode)
printf("CFB64: initial vector received\r\n");
if (encrypt_debug_mode)
printf("Initializing Decrypt stream\r\n");
fb64_stream_iv((void *)data, &fbp->streams[DIR_DECRYPT-1]);
p = fbp->fb_feed + 3;
*p++ = ENCRYPT_REPLY;
p++;
*p++ = FB64_IV_OK;
*p++ = IAC;
*p++ = SE;
printsub('>', &fbp->fb_feed[2], p - &fbp->fb_feed[2]);
net_write(fbp->fb_feed, p - fbp->fb_feed);
state = fbp->state[DIR_DECRYPT-1] = IN_PROGRESS;
break;
default:
if (encrypt_debug_mode) {
printf("Unknown option type: %d\r\n", *(data-1));
printd(data, cnt);
printf("\r\n");
}
/* FALL THROUGH */
failure:
/*
* We failed. Send an FB64_IV_BAD option
* to the other side so it will know that
* things failed.
*/
p = fbp->fb_feed + 3;
*p++ = ENCRYPT_REPLY;
p++;
*p++ = FB64_IV_BAD;
*p++ = IAC;
*p++ = SE;
printsub('>', &fbp->fb_feed[2], p - &fbp->fb_feed[2]);
net_write(fbp->fb_feed, p - fbp->fb_feed);
break;
}
return(fbp->state[DIR_DECRYPT-1] = state);
}
