+++ /dev/null
-/*
- * Copyright © 2011 Keith Packard <keithp@keithp.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-
-#include "ao.h"
-
-#if !HAS_AES
-#error Must define HAS_AES 1
-#endif
-
-__xdata uint8_t ao_aes_mutex;
-__xdata uint8_t ao_aes_done;
-__xdata uint8_t ao_aes_dma_in, ao_aes_dma_out;
-__xdata uint8_t ao_aes_dma_in_done, ao_aes_dma_out_done;
-__pdata enum ao_aes_mode ao_aes_current_mode;
-
-void
-ao_aes_isr(void) __interrupt 4
-{
- S0CON = 0;
- if (ENCCCS & ENCCCS_RDY) {
- ao_aes_done = 1;
- ao_wakeup(&ao_aes_done);
- }
-}
-
-void
-ao_aes_set_mode(enum ao_aes_mode mode)
-{
- ao_aes_current_mode = mode;
-}
-
-void
-ao_aes_set_key(__xdata uint8_t *in)
-{
- ao_dma_set_transfer(ao_aes_dma_in,
- in,
- &ENCDIXADDR,
- AO_AES_LEN,
- DMA_CFG0_WORDSIZE_8 |
- DMA_CFG0_TMODE_SINGLE |
- DMA_CFG0_TRIGGER_ENC_DW,
- DMA_CFG1_SRCINC_1 |
- DMA_CFG1_DESTINC_0 |
- DMA_CFG1_PRIORITY_LOW);
- ao_dma_start(ao_aes_dma_in);
- ao_aes_done = 0;
- ENCCCS = ENCCCS_MODE_CBC_MAC |
- ENCCCS_CMD_LOAD_KEY;
- ENCCCS |= ENCCCS_START;
- __critical while (!ao_aes_done)
- ao_sleep(&ao_aes_done);
-}
-
-void
-ao_aes_zero_iv(void)
-{
- uint8_t b;
-
- ENCCCS = ENCCCS_MODE_CBC_MAC | ENCCCS_CMD_LOAD_IV | ENCCCS_START;
- for (b = 0; b < AO_AES_LEN; b++)
- ENCDI = 0;
-}
-
-void
-ao_aes_run(__xdata uint8_t *in,
- __xdata uint8_t *out)
-{
- uint8_t b;
- if (in) {
- ao_dma_set_transfer(ao_aes_dma_in,
- in,
- &ENCDIXADDR,
- AO_AES_LEN,
- DMA_CFG0_WORDSIZE_8 |
- DMA_CFG0_TMODE_SINGLE |
- DMA_CFG0_TRIGGER_ENC_DW,
- DMA_CFG1_SRCINC_1 |
- DMA_CFG1_DESTINC_0 |
- DMA_CFG1_PRIORITY_LOW);
- }
- if (out) {
- ao_dma_set_transfer(ao_aes_dma_out,
- &ENCDOXADDR,
- out,
- AO_AES_LEN,
- DMA_CFG0_WORDSIZE_8 |
- DMA_CFG0_TMODE_SINGLE |
- DMA_CFG0_TRIGGER_ENC_UP,
- DMA_CFG1_SRCINC_0 |
- DMA_CFG1_DESTINC_1 |
- DMA_CFG1_PRIORITY_LOW);
- }
- switch (ao_aes_current_mode) {
- case ao_aes_mode_cbc_mac:
- if (out)
- b = (ENCCCS_MODE_CBC |
- ENCCCS_CMD_ENCRYPT);
- else
- b = (ENCCCS_MODE_CBC_MAC |
- ENCCCS_CMD_ENCRYPT);
- break;
- default:
- return;
- }
- ao_aes_done = 0;
- if (in)
- ao_dma_start(ao_aes_dma_in);
- if (out)
- ao_dma_start(ao_aes_dma_out);
- ENCCCS = b;
- ENCCCS |= ENCCCS_START;
- if (out) {
- __critical while (!ao_aes_dma_out_done)
- ao_sleep(&ao_aes_dma_out_done);
- } else {
- __critical while (!ao_aes_done)
- ao_sleep(&ao_aes_done);
- }
-}
-
-void
-ao_aes_init(void)
-{
- ao_aes_dma_in = ao_dma_alloc(&ao_aes_dma_in_done);
- ao_aes_dma_out = ao_dma_alloc(&ao_aes_dma_out_done);
- S0CON = 0;
- ENCIE = 1;
-}