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Merge BlockstreamResearch/secp256k1-zkp#365: tests: Port hash context tests to zkp modules

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72867fd682 tests: Port hash context tests to zkp modules (mllwchrry)

Pull request description:

  Ports the hash context tests from bitcoin-core/secp256k1#1777 to the zkp-specific modules.


ACKs for top commit:
  apoelstra:
    ACK 72867fd682279ff2c79cf13f4f8d8484048d2527; successfully ran local tests


Tree-SHA512: 1714a4c5fd793b32a0f00a92670a48709e4d01917bb81739428601c6e88e89f871cdc1294024e6df7272d6c16e681309d9b3448adcd07ce37bfa2be2dc3f4172
This commit is contained in:
Andrew Poelstra
2026-08-18 15:20:17 +00:00
parent e166e4024f 72867fd682
commit 10366dbbbf
6 changed files with 177 additions and 1 deletions
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36
src/modules/surjection/tests_impl.h
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@@ -784,6 +784,41 @@ static void test_surjectionproof_generate_changes_s_values(void) {
}
}
DEFINE_SHA256_TRANSFORM_PROBE(sha256_surjection)
static void test_surjectionproof_ctx_sha256(void) {
/* Check ctx-provided SHA256 compression override takes effect */
secp256k1_context *ctx = secp256k1_context_clone(CTX);
unsigned char serialized_default[SECP256K1_SURJECTIONPROOF_SERIALIZATION_BYTES(1, 1)];
unsigned char serialized_custom[SECP256K1_SURJECTIONPROOF_SERIALIZATION_BYTES(1, 1)];
unsigned char seed[32] = {1};
unsigned char input_blinding[32] = {1}, output_blinding[32] = {2};
secp256k1_fixed_asset_tag fixed_tag = {{1}};
secp256k1_generator input_tag, output_tag;
secp256k1_surjectionproof proof;
size_t input_index;
size_t serialized_len = sizeof(serialized_default);
CHECK(secp256k1_generator_generate_blinded(CTX, &input_tag, fixed_tag.data, input_blinding));
CHECK(secp256k1_generator_generate_blinded(CTX, &output_tag, fixed_tag.data, output_blinding));
/* Default behavior. No ctx-provided SHA256 compression */
CHECK(secp256k1_surjectionproof_initialize(ctx, &proof, &input_index, &fixed_tag, 1, 1, &fixed_tag, 100, seed) > 0);
CHECK(secp256k1_surjectionproof_generate(ctx, &proof, &input_tag, 1, &output_tag, 0, input_blinding, output_blinding));
CHECK(secp256k1_surjectionproof_serialize(ctx, serialized_default, &serialized_len, &proof));
CHECK(!sha256_surjection_called);
/* Override SHA256 compression directly, bypassing the ctx setter sanity checks */
ctx->hash_ctx.fn_sha256_compression = sha256_surjection;
CHECK(secp256k1_surjectionproof_initialize(ctx, &proof, &input_index, &fixed_tag, 1, 1, &fixed_tag, 100, seed) > 0);
CHECK(secp256k1_surjectionproof_generate(ctx, &proof, &input_tag, 1, &output_tag, 0, input_blinding, output_blinding));
CHECK(secp256k1_surjectionproof_serialize(ctx, serialized_custom, &serialized_len, &proof));
CHECK(sha256_surjection_called);
/* Outputs must differ if custom compression was used */
CHECK(secp256k1_memcmp_var(serialized_default, serialized_custom, serialized_len) != 0);
secp256k1_context_destroy(ctx);
}
/* --- Test registry --- */
static const struct tf_test_entry tests_surjection[] = {
CASE1(test_surjectionproof_api),
@@ -797,6 +832,7 @@ static const struct tf_test_entry tests_surjection[] = {
CASE1(test_no_used_inputs_verify),
CASE1(test_bad_serialize),
CASE1(test_bad_parse),
CASE1(test_surjectionproof_ctx_sha256),
};
#endif