void cc3200_hash_update(struct cc3200_hash_ctx *ctx, const uint8_t *data,
uint32_t len) {
if (ctx->block_len > 0) {
uint32_t block_remain = CC3200_HASH_BLOCK_SIZE - ctx->block_len;
if (block_remain > len) block_remain = len;
memcpy(ctx->block + ctx->block_len, data, block_remain);
ctx->block_len += block_remain;
data += block_remain;
len -= block_remain;
if (ctx->block_len < CC3200_HASH_BLOCK_SIZE) return;
}
const uint32_t to_hash =
(((uint32_t) ctx->block_len) + len) & ~(CC3200_HASH_BLOCK_SIZE - 1);
if (to_hash > 0) {
vPortEnterCritical();
init_engine(ctx, 0);
HWREG(SHAMD5_BASE + SHAMD5_O_LENGTH) = to_hash;
if (ctx->block_len == CC3200_HASH_BLOCK_SIZE) {
while (
!(HWREG(SHAMD5_BASE + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_INPUT_READY))
;
uint32_t *p = (uint32_t *) ctx->block;
for (int i = 0; i < CC3200_HASH_BLOCK_SIZE; i += 4) {
HWREG(SHAMD5_BASE + SHAMD5_O_DATA0_IN + i) = *p++;
}
}
while (len >= CC3200_HASH_BLOCK_SIZE) {
while (
!(HWREG(SHAMD5_BASE + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_INPUT_READY))
;
for (int i = 0; i < CC3200_HASH_BLOCK_SIZE; i += 4) {
HWREG(SHAMD5_BASE + SHAMD5_O_DATA0_IN + i) = *((uint32_t *) data);
data += 4;
len -= 4;
}
}
while (!(HWREG(SHAMD5_BASE + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY))
;
MAP_SHAMD5ResultRead(SHAMD5_BASE, (uint8_t *) ctx->digest);
/* Must read count register to finish the round. */
HWREG(SHAMD5_BASE + SHAMD5_O_DIGEST_COUNT);
MAP_PRCMPeripheralClkDisable(PRCM_DTHE, PRCM_RUN_MODE_CLK);
vPortExitCritical();
}
memcpy(ctx->block, data, len);
ctx->block_len = len;
}
void cc3200_hash_final(struct cc3200_hash_ctx *ctx, uint8_t *digest) {
vPortEnterCritical();
init_engine(ctx, SHAMD5_MODE_CLOSE_HASH);
HWREG(SHAMD5_BASE + SHAMD5_O_LENGTH) = ctx->block_len;
int bl = ctx->block_len;
int i = 0;
uint32_t *p = (uint32_t *) ctx->block;
while (bl - i > 4) {
HWREG(SHAMD5_BASE + SHAMD5_O_DATA0_IN + i) = *p++;
i += 4;
}
if (i < bl) {
for (int j = bl; j % 4 != 0; j++) ctx->block[j] = 0;
HWREG(SHAMD5_BASE + SHAMD5_O_DATA0_IN + i) = *p;
}
while (!(HWREG(SHAMD5_BASE + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY))
;
MAP_SHAMD5ResultRead(SHAMD5_BASE, digest);
/* Must read count register to finish the round. */
HWREG(SHAMD5_BASE + SHAMD5_O_DIGEST_COUNT);
MAP_PRCMPeripheralClkDisable(PRCM_DTHE, PRCM_RUN_MODE_CLK);
vPortExitCritical();
}
void HASH_SHAMD5Read (uint8_t *hash) {
// wait for the output to be ready
while((HWREG(SHAMD5_BASE + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY) == 0);
// read the result
MAP_SHAMD5ResultRead(SHAMD5_BASE, hash);
}
