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hs_pow: unswap byte order of seed_head field

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In proposal 327, "POW_SEED is the first 4 bytes of the seed used".

The proposal doesn't specifically mention the data type of this field,
and the code in hs_pow so far treats it as an integer but semantically
it's more like the first four bytes of an already-encoded little endian
blob. This leads to a byte swap, since the type confusion takes place
in a little-endian subsystem but the wire encoding of seed_head uses
tor's default of big endian.

This patch does not address the underlying type confusion, it's a
minimal change that only swaps the byte order and updates unit tests
accordingly. Further changes will clean up the data types.

Signed-off-by: Micah Elizabeth Scott <beth@torproject.org>
This commit is contained in:
Micah Elizabeth Scott 2023-03-14 15:25:12 -07:00
parent 037dea2252
commit 1a3afeb387
3 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/feature/hs/hs_pow.c
View File

@ -182,7 +182,7 @@ hs_pow_solve(const hs_pow_desc_params_t *pow_params,
/* Store the effort E. */
pow_solution_out->effort = effort;
/* We only store the first 4 bytes of the seed C. */
pow_solution_out->seed_head = get_uint32(pow_params->seed);
pow_solution_out->seed_head = tor_ntohl(get_uint32(pow_params->seed));
/* Store the solution S */
memcpy(&pow_solution_out->equix_solution, sol,
sizeof(pow_solution_out->equix_solution));
@ -231,9 +231,11 @@ hs_pow_verify(const hs_pow_service_state_t *pow_state,
/* Find a valid seed C that starts with the seed head. Fail if no such seed
* exists. */
if (get_uint32(pow_state->seed_current) == pow_solution->seed_head) {
if (tor_ntohl(get_uint32(pow_state->seed_current))
== pow_solution->seed_head) {
seed = pow_state->seed_current;
} else if (get_uint32(pow_state->seed_previous) == pow_solution->seed_head) {
} else if (tor_ntohl(get_uint32(pow_state->seed_previous))
== pow_solution->seed_head) {
seed = pow_state->seed_previous;
} else {
log_warn(LD_REND, "Seed head didn't match either seed.");

9
src/test/test_hs_pow.c
View File

@ -315,7 +315,7 @@ test_hs_pow_vectors(void *arg)
"cdd49fdbc34326d9d2f18ed277469c63", "7f153437c58620d3ea4717746093dde6",
"01"
"cdd49fdbc34326d9d2f18ed277469c63"
"0001869f" "cf0afb86"
"0001869f" "86fb0acf"
"7f153437c58620d3ea4717746093dde6"
},
{
@ -325,7 +325,7 @@ test_hs_pow_vectors(void *arg)
"cdd49fdbc34326d9d2f18ed270469c63", "7f153437c58620d3ea4717746093dde6",
"01"
"cdd49fdbc34326d9d2f18ed270469c63"
"000186a0" "cf0afb86"
"000186a0" "86fb0acf"
"7f153437c58620d3ea4717746093dde6"
},
{
@ -335,7 +335,7 @@ test_hs_pow_vectors(void *arg)
"cdd49fdbc34326d9d2f18ed277469c63", "7f153437c58620d3ea4717746093dde6",
"01"
"cdd49fdbc34326d9d2f18ed277469c63"
"000186a0" "cf0afb86"
"000186a0" "86fb0acf"
"7f153437c58620d3ea4717746093dde6"
}
};
@ -382,8 +382,7 @@ test_hs_pow_vectors(void *arg)
sol_hex, 2 * sizeof solution.equix_solution),
OP_EQ, HS_POW_EQX_SOL_LEN);
memcpy(&solution.seed_head, pow_state->seed_previous,
sizeof solution.seed_head);
solution.seed_head = tor_ntohl(get_uint32(pow_state->seed_previous));
/* Try to encode 'solution' into a relay cell */

5
src/test/test_hs_pow_slow.c
View File

@ -211,15 +211,14 @@ test_hs_pow_vectors(void *arg)
sizeof solution.equix_solution,
sol_hex, 2 * sizeof solution.equix_solution),
OP_EQ, HS_POW_EQX_SOL_LEN);
memcpy(&solution.seed_head, params.seed, sizeof solution.seed_head);
solution.seed_head = tor_ntohl(get_uint32(params.seed));
memset(&output, 0xaa, sizeof output);
testing_enable_prefilled_rng(rng_bytes, HS_POW_NONCE_LEN);
tt_int_op(0, OP_EQ, hs_pow_solve(&params, &output));
testing_disable_prefilled_rng();
tt_mem_op(params.seed, OP_EQ, &output.seed_head,
sizeof output.seed_head);
tt_int_op(solution.seed_head, OP_EQ, output.seed_head);
tt_mem_op(&solution.nonce, OP_EQ, &output.nonce,
sizeof output.nonce);
tt_mem_op(&solution.equix_solution, OP_EQ, &output.equix_solution,