From 4ff6e4274d49cb95ab246b599b274104baf83f9f Mon Sep 17 00:00:00 2001 From: Andrew Poelstra Date: Tue, 26 Jul 2022 17:09:36 +0000 Subject: [PATCH] surjectionproof: add test for existing behavior on input=output proofs --- src/modules/surjection/tests_impl.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/src/modules/surjection/tests_impl.h b/src/modules/surjection/tests_impl.h index 89ba4e1a6..709557600 100644 --- a/src/modules/surjection/tests_impl.h +++ b/src/modules/surjection/tests_impl.h @@ -524,6 +524,33 @@ void test_bad_parse(void) { CHECK(secp256k1_surjectionproof_parse(ctx, &proof, serialized_proof2, sizeof(serialized_proof2)) == 0); } +void test_input_eq_output(void) { + secp256k1_surjectionproof proof; + secp256k1_fixed_asset_tag fixed_tag; + secp256k1_generator ephemeral_tag; + unsigned char blinding_key[32]; + unsigned char entropy[32]; + size_t input_index; + + secp256k1_testrand256(fixed_tag.data); + secp256k1_testrand256(blinding_key); + secp256k1_testrand256(entropy); + + CHECK(secp256k1_surjectionproof_initialize(ctx, &proof, &input_index, &fixed_tag, 1, 1, &fixed_tag, 100, entropy) == 1); + CHECK(input_index == 0); + + /* Generation should fail */ + CHECK(secp256k1_generator_generate_blinded(ctx, &ephemeral_tag, fixed_tag.data, blinding_key)); + CHECK(!secp256k1_surjectionproof_generate(ctx, &proof, &ephemeral_tag, 1, &ephemeral_tag, input_index, blinding_key, blinding_key)); + + /* It succeeds when the blinding factor is 0... (will fix this in the next commit) */ + memset(blinding_key, 0, 32); + CHECK(secp256k1_generator_generate_blinded(ctx, &ephemeral_tag, fixed_tag.data, blinding_key)); + CHECK(secp256k1_surjectionproof_generate(ctx, &proof, &ephemeral_tag, 1, &ephemeral_tag, input_index, blinding_key, blinding_key)); + /* ...but verification doesn't */ + CHECK(!secp256k1_surjectionproof_verify(ctx, &proof, &ephemeral_tag, 1, &ephemeral_tag)); +} + void test_fixed_vectors(void) { const unsigned char tag0_ser[] = { 0x0a, @@ -672,6 +699,7 @@ void test_fixed_vectors(void) { void run_surjection_tests(void) { test_surjectionproof_api(); + test_input_eq_output(); test_fixed_vectors(); test_input_selection(0);