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44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/cert/merkle_audit_proof.h"
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#include "base/logging.h"
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namespace net {
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namespace ct {
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uint64_t CalculateAuditPathLength(uint64_t leaf_index, uint64_t tree_size) {
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// RFC6962, section 2.1.1, describes audit paths.
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// Algorithm taken from
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// https://github.com/google/certificate-transparency-rfcs/blob/c8844de6bd0b5d3d16bac79865e6edef533d760b/dns/draft-ct-over-dns.md#retrieve-merkle-audit-proof-from-log-by-leaf-hash.
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CHECK_LT(leaf_index, tree_size);
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uint64_t length = 0;
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uint64_t index = leaf_index;
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uint64_t last_node = tree_size - 1;
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while (last_node != 0) {
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if ((index % 2 != 0) || index != last_node)
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++length;
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index /= 2;
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last_node /= 2;
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}
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return length;
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}
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MerkleAuditProof::MerkleAuditProof() = default;
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MerkleAuditProof::MerkleAuditProof(const MerkleAuditProof& other) = default;
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MerkleAuditProof::MerkleAuditProof(uint64_t leaf_index,
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uint64_t tree_size,
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const std::vector<std::string>& audit_path)
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: leaf_index(leaf_index), tree_size(tree_size), nodes(audit_path) {}
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MerkleAuditProof::~MerkleAuditProof() = default;
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} // namespace ct
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} // namespace net
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