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fw: Create compute_app_digest() function

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Daniel Jobson 2024-09-04 10:54:44 +02:00
parent 698b2796ee
commit 2246dbfa45
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GPG Key ID: 3707A9DBF4BB8F1A
1 changed files with 11 additions and 7 deletions
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18
hw/application_fpga/fw/tk1/main.c
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@ -47,6 +47,7 @@ struct context {
static void print_hw_version(void);
static void print_digest(uint8_t *md);
static uint32_t rnd_word(void);
static int compute_app_digest(uint8_t *digest);
static void compute_cdi(const uint8_t *digest, const bool use_uss,
const uint8_t *uss);
static void copy_name(uint8_t *buf, const size_t bufsiz, const uint32_t word);
@ -91,6 +92,14 @@ static uint32_t rnd_word(void)
return *trng_entropy;
}
/* Computes the blake2s digest of the app loaded into RAM */
static int compute_app_digest(uint8_t *digest)
{
blake2s_ctx b2s_ctx = {0};
return blake2s(digest, 32, NULL, 0, (const void *)TK1_RAM_BASE,
*app_size, &b2s_ctx);
}
// CDI = blake2s(uds, blake2s(app), uss)
static void compute_cdi(const uint8_t *digest, const bool use_uss,
const uint8_t *uss)
@ -277,19 +286,14 @@ static enum state loading_commands(const struct frame_header *hdr,
ctx->left -= nbytes;
if (ctx->left == 0) {
blake2s_ctx b2s_ctx = {0};
int blake2err = 0;
htif_puts("Fully loaded ");
htif_putinthex(*app_size);
htif_lf();
// Compute Blake2S digest of the app,
// storing it for FW_STATE_RUN
blake2err = blake2s(&ctx->digest, 32, NULL, 0,
(const void *)TK1_RAM_BASE,
*app_size, &b2s_ctx);
assert(blake2err == 0);
int digest_err = compute_app_digest(ctx->digest);
assert(digest_err == 0);
print_digest(ctx->digest);
// And return the digest in final