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rboot: Add cryptographic digest support for OTA images & SHA256 example

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This commit is contained in:
Angus Gratton 2016-03-23 19:44:27 +11:00
parent 03559de5cb
commit 53b2b50241
5 changed files with 88 additions and 6 deletions
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14
extras/rboot-ota/rboot-api.c
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@ -355,6 +355,20 @@ bool rboot_verify_image(uint32_t initial_offset, uint32_t *image_length, const c
return false;
}
bool rboot_digest_image(uint32_t offset, uint32_t image_length, rboot_digest_update_fn update_fn, void *update_ctx)
{
uint8_t buf[32] __attribute__((aligned(4)));
for(int i = 0; i < image_length; i += sizeof(buf)) {
if(sdk_spi_flash_read(offset+i, buf, sizeof(buf)))
return false;
uint32_t digest_len = sizeof(buf);
if(i + digest_len > image_length)
digest_len = image_length - i;
update_fn(update_ctx, buf, digest_len);
}
return true;
}
#ifdef __cplusplus
}
#endif