diff options
| author | Keith Packard <keithp@keithp.com> | 2011-07-20 23:46:04 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-08-27 12:33:46 -0700 |
| commit | 776df9ce2e7b4fa5cedda326988e66c614299af4 (patch) | |
| tree | bf516c8f3eca55a8d4387c8cfd5fb3468d336c7b /src/ao_aes.c | |
| parent | bd0bf00081bb24af5cd67a9351b0b0c1a041d0d3 (diff) | |
altos: Get AES CBC-MAC packet transfers running
This just has simple command-line based packet transfers for testing.
This also adds special ao_telelaunch bits where the launch control
code will live.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/ao_aes.c')
| -rw-r--r-- | src/ao_aes.c | 48 |
1 files changed, 34 insertions, 14 deletions
diff --git a/src/ao_aes.c b/src/ao_aes.c index 649eda06..d50fecfb 100644 --- a/src/ao_aes.c +++ b/src/ao_aes.c @@ -17,6 +17,10 @@ #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; @@ -45,22 +49,33 @@ ao_aes_set_key(__xdata uint8_t *in) ao_dma_set_transfer(ao_aes_dma_in, in, &ENCDIXADDR, - 7, + 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_START; - while (!ao_aes_done) + 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) { @@ -69,7 +84,7 @@ ao_aes_run(__xdata uint8_t *in, ao_dma_set_transfer(ao_aes_dma_in, in, &ENCDIXADDR, - 7, + AO_AES_LEN, DMA_CFG0_WORDSIZE_8 | DMA_CFG0_TMODE_SINGLE | DMA_CFG0_TRIGGER_ENC_DW, @@ -81,7 +96,7 @@ ao_aes_run(__xdata uint8_t *in, ao_dma_set_transfer(ao_aes_dma_out, &ENCDOXADDR, out, - 7, + AO_AES_LEN, DMA_CFG0_WORDSIZE_8 | DMA_CFG0_TMODE_SINGLE | DMA_CFG0_TRIGGER_ENC_UP, @@ -93,24 +108,28 @@ ao_aes_run(__xdata uint8_t *in, case ao_aes_mode_cbc_mac: if (out) b = (ENCCCS_MODE_CBC | - ENCCCS_CMD_ENCRYPT | - ENCCCS_START); + ENCCCS_CMD_ENCRYPT); else b = (ENCCCS_MODE_CBC_MAC | - ENCCCS_CMD_ENCRYPT | - ENCCCS_START); + ENCCCS_CMD_ENCRYPT); break; default: return; } ao_aes_done = 0; - ENCCCS = b; + if (in) + ao_dma_start(ao_aes_dma_in); if (out) - while (!ao_aes_dma_out_done) + 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 - while (!ao_aes_done) + } else { + __critical while (!ao_aes_done) ao_sleep(&ao_aes_done); + } } void @@ -118,5 +137,6 @@ 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; } |