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-rw-r--r--hal.h1
-rw-r--r--hash.c100
2 files changed, 68 insertions, 33 deletions
diff --git a/hal.h b/hal.h
index 8b731d4..15ab8f9 100644
--- a/hal.h
+++ b/hal.h
@@ -517,6 +517,7 @@ typedef struct {
const uint8_t * const digest_algorithm_id;
size_t digest_algorithm_id_length;
const void *driver;
+ unsigned can_restore_state : 1;
} hal_hash_descriptor_t;
/*
diff --git a/hash.c b/hash.c
index f48e079..af461a6 100644
--- a/hash.c
+++ b/hash.c
@@ -76,7 +76,8 @@ typedef struct {
} driver_t;
/*
- * Hash state.
+ * Hash state. For now we assume that the only core state we need to
+ * save and restore is the current digest value.
*/
typedef struct {
@@ -84,7 +85,8 @@ typedef struct {
const driver_t *driver;
uint64_t msg_length_high; /* Total data hashed in this message */
uint64_t msg_length_low; /* (128 bits in SHA-512 cases) */
- uint8_t block[HAL_MAX_HASH_BLOCK_LENGTH]; /* Block we're accumulating */
+ uint8_t block[HAL_MAX_HASH_BLOCK_LENGTH], /* Block we're accumulating */
+ core_state[HAL_MAX_HASH_DIGEST_LENGTH]; /* Saved core state */
size_t block_used; /* How much of the block we've used */
unsigned block_count; /* Blocks sent */
} internal_hash_state_t;
@@ -185,42 +187,42 @@ const hal_hash_descriptor_t hal_hash_sha1[1] = {{
SHA1_BLOCK_LEN, SHA1_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha1, sizeof(dalgid_sha1),
- &sha1_driver
+ &sha1_driver, 0
}};
const hal_hash_descriptor_t hal_hash_sha256[1] = {{
SHA256_BLOCK_LEN, SHA256_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha256, sizeof(dalgid_sha256),
- &sha256_driver
+ &sha256_driver, 1
}};
const hal_hash_descriptor_t hal_hash_sha512_224[1] = {{
SHA512_BLOCK_LEN, SHA512_224_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha512_224, sizeof(dalgid_sha512_224),
- &sha512_224_driver
+ &sha512_224_driver, 0
}};
const hal_hash_descriptor_t hal_hash_sha512_256[1] = {{
SHA512_BLOCK_LEN, SHA512_256_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha512_256, sizeof(dalgid_sha512_256),
- &sha512_256_driver
+ &sha512_256_driver, 0
}};
const hal_hash_descriptor_t hal_hash_sha384[1] = {{
SHA512_BLOCK_LEN, SHA384_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha384, sizeof(dalgid_sha384),
- &sha384_driver
+ &sha384_driver, 0
}};
const hal_hash_descriptor_t hal_hash_sha512[1] = {{
SHA512_BLOCK_LEN, SHA512_DIGEST_LEN,
sizeof(internal_hash_state_t), sizeof(internal_hmac_state_t),
dalgid_sha512, sizeof(dalgid_sha512),
- &sha512_driver
+ &sha512_driver, 0
}};
/*
@@ -281,17 +283,54 @@ hal_error_t hal_hash_initialize(const hal_hash_descriptor_t * const descriptor,
memset(state, 0, sizeof(*state));
state->descriptor = descriptor;
state->driver = driver;
-
+
opaque_state->state = state;
return HAL_OK;
}
/*
+ * Read hash result from core. At least for now, this also serves to
+ * read current hash state from core.
+ */
+
+static hal_error_t hash_read_digest(const driver_t * const driver,
+ uint8_t *digest,
+ const size_t digest_length)
+{
+ hal_error_t err;
+
+ assert(digest != NULL && digest_length % 4 == 0);
+
+ if ((err = hal_io_wait_valid(driver->status_addr)) != HAL_OK)
+ return err;
+
+ return hal_io_read(driver->digest_addr, digest, digest_length);
+}
+
+/*
+ * Write hash state back to core.
+ */
+
+static hal_error_t hash_write_digest(const driver_t * const driver,
+ const uint8_t * const digest,
+ const size_t digest_length)
+{
+ hal_error_t err;
+
+ assert(digest != NULL && digest_length % 4 == 0);
+
+ if ((err = hal_io_wait_ready(driver->status_addr)) != HAL_OK)
+ return err;
+
+ return hal_io_write(driver->digest_addr, digest, digest_length);
+}
+
+/*
* Send one block to a core.
*/
-static hal_error_t hash_write_block(const internal_hash_state_t * const state)
+static hal_error_t hash_write_block(internal_hash_state_t *state)
{
uint8_t ctrl_cmd[4];
hal_error_t err;
@@ -299,43 +338,38 @@ static hal_error_t hash_write_block(const internal_hash_state_t * const state)
assert(state != NULL && state->descriptor != NULL && state->driver != NULL);
assert(state->descriptor->block_length % 4 == 0);
+ assert(state->descriptor->digest_length <= sizeof(state->core_state) ||
+ !state->descriptor->can_restore_state);
+
if (debug)
fprintf(stderr, "[ %s ]\n", state->block_count == 0 ? "init" : "next");
- if ((err = hal_io_write(state->driver->block_addr, state->block, state->descriptor->block_length)) != HAL_OK)
+ if ((err = hal_io_wait_ready(state->driver->status_addr)) != HAL_OK)
+ return err;
+
+ if (state->descriptor->can_restore_state &&
+ state->block_count != 0 &&
+ (err = hash_write_digest(state->driver, state->core_state,
+ state->descriptor->digest_length)) != HAL_OK)
+ return err;
+
+ if ((err = hal_io_write(state->driver->block_addr, state->block,
+ state->descriptor->block_length)) != HAL_OK)
return err;
ctrl_cmd[0] = ctrl_cmd[1] = ctrl_cmd[2] = 0;
ctrl_cmd[3] = state->block_count == 0 ? CTRL_INIT : CTRL_NEXT;
ctrl_cmd[3] |= state->driver->ctrl_mode;
- /*
- * Not sure why we're waiting for ready here, but it's what the old
- * (read: tested) code did, so keep that behavior for now.
- */
-
if ((err = hal_io_write(state->driver->ctrl_addr, ctrl_cmd, sizeof(ctrl_cmd))) != HAL_OK)
return err;
- return hal_io_wait_valid(state->driver->status_addr);
-}
-
-/*
- * Read hash result from core.
- */
-
-static hal_error_t hash_read_digest(const driver_t * const driver,
- uint8_t *digest,
- const size_t digest_length)
-{
- hal_error_t err;
-
- assert(digest != NULL && digest_length % 4 == 0);
-
- if ((err = hal_io_wait_valid(driver->status_addr)) != HAL_OK)
+ if (state->descriptor->can_restore_state &&
+ (err = hash_read_digest(state->driver, state->core_state,
+ state->descriptor->digest_length)) != HAL_OK)
return err;
- return hal_io_read(driver->digest_addr, digest, digest_length);
+ return hal_io_wait_valid(state->driver->status_addr);
}
/*