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fix(sha): DMA mode iteration calculation issue for certain data lengths

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SHA hardware DMA mode calculation had off-by-one error for specific
input lengths. This was causing last chunk of the input data not being
fed to the hardware accelerator and hence resulting in an incorrect
final result.

Closes: https://github.com/espressif/esp-idf/issues/11915
This commit is contained in:
Mahavir Jain 2023-07-26 15:31:12 +05:30
parent afcf3e261b
commit b966103800
1 changed files with 10 additions and 1 deletions
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11
components/mbedtls/port/sha/dma/sha.c
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@ -217,7 +217,6 @@ int esp_sha_dma(esp_sha_type sha_type, const void *input, uint32_t ilen,
{
int ret = 0;
unsigned char *dma_cap_buf = NULL;
int dma_op_num = ( ilen / (SOC_SHA_DMA_MAX_BUFFER_SIZE + 1) ) + 1;
if (buf_len > block_length(sha_type)) {
ESP_LOGE(TAG, "SHA DMA buf_len cannot exceed max size for a single block");
@ -251,6 +250,16 @@ int esp_sha_dma(esp_sha_type sha_type, const void *input, uint32_t ilen,
buf = dma_cap_buf;
}
uint32_t dma_op_num;
if (ilen > 0) {
/* Number of DMA operations based on maximum chunk size in single operation */
dma_op_num = (ilen + SOC_SHA_DMA_MAX_BUFFER_SIZE - 1) / SOC_SHA_DMA_MAX_BUFFER_SIZE;
} else {
/* For zero input length, we must allow at-least 1 DMA operation to see
* if there is any pending data that is yet to be copied out */
dma_op_num = 1;
}
/* The max amount of blocks in a single hardware operation is 2^6 - 1 = 63
Thus we only do a single DMA input list + dma buf list,