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surjection proof: Reject proofs with too many used inputs in reduced mode

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This commit is contained in:
Tim Ruffing
2019-06-05 11:15:11 +02:00
parent bd70820123
commit d6738e890e
3 changed files with 20 additions and 3 deletions
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5
src/modules/surjection/main_impl.h
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@@ -373,6 +373,11 @@ int secp256k1_surjectionproof_verify(const secp256k1_context* ctx, const secp256
return 0;
}
/* Reject proofs with too many used inputs in USE_REDUCED_SURJECTION_PROOF_SIZE mode */
if (n_used_pubkeys > SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS) {
return 0;
}
if (secp256k1_surjection_compute_public_keys(ring_pubkeys, n_used_pubkeys, ephemeral_input_tags, n_total_pubkeys, proof->used_inputs, ephemeral_output_tag, 0, NULL) == 0) {
return 0;
}