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rangeproof: add unit test for malleating single-value proofs #295

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Jun 20, 2024
Merged

rangeproof: add unit test for malleating single-value proofs #295

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25 changes: 25 additions & 0 deletions src/modules/rangeproof/tests_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -422,6 +422,7 @@ static void test_single_value_proof(uint64_t val) {

uint64_t val_out = 0;
size_t m_len_out = 0;
size_t i;

secp256k1_testrand256(blind);
secp256k1_testrand256(nonce);
Expand Down Expand Up @@ -463,6 +464,30 @@ static void test_single_value_proof(uint64_t val) {
CHECK(plen == 73);
}

/* Test if trailing bytes are rejected. */
proof[plen] = 0;
CHECK(secp256k1_rangeproof_verify(
CTX,
&min_val_out, &max_val_out,
&commit,
proof, plen + 1,
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NULL, 0,
secp256k1_generator_h
) == 0);
/* Test if single-bit malleation is caught */
for (i = 0; i < plen*8; i++) {
proof[i >> 3] ^= 1 << (i & 7);
CHECK(secp256k1_rangeproof_verify(
CTX,
&min_val_out, &max_val_out,
&commit,
proof, plen,
NULL, 0,
secp256k1_generator_h
) == 0);
proof[i >> 3] ^= 1 << (i & 7);
}
/* Test if unchanged proof is accepted. */
CHECK(secp256k1_rangeproof_verify(
CTX,
&min_val_out, &max_val_out,
Expand Down
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