diff options
Diffstat (limited to 'src/cc1111')
| -rw-r--r-- | src/cc1111/ao_aes.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/cc1111/ao_aes.c b/src/cc1111/ao_aes.c new file mode 100644 index 00000000..d50fecfb --- /dev/null +++ b/src/cc1111/ao_aes.c @@ -0,0 +1,142 @@ +/* + * 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; +} |