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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef NET_CERT_CT_LOG_VERIFIER_H_
- #define NET_CERT_CT_LOG_VERIFIER_H_
- #include <string>
- #include "base/gtest_prod_util.h"
- #include "base/memory/raw_ptr.h"
- #include "base/memory/ref_counted.h"
- #include "base/strings/string_piece.h"
- #include "net/base/net_export.h"
- #include "net/cert/signed_certificate_timestamp.h"
- #include "third_party/boringssl/src/include/openssl/base.h"
- namespace net {
- namespace ct {
- struct MerkleAuditProof;
- struct MerkleConsistencyProof;
- struct SignedTreeHead;
- } // namespace ct
- // Class for verifying signatures of a single Certificate Transparency
- // log, whose identity is provided during construction.
- // Currently can verify Signed Certificate Timestamp (SCT) and Signed
- // Tree Head (STH) signatures.
- // Immutable: Does not hold any state beyond the log information it was
- // initialized with.
- class NET_EXPORT CTLogVerifier
- : public base::RefCountedThreadSafe<CTLogVerifier> {
- public:
- // Creates a new CTLogVerifier that will verify SignedCertificateTimestamps
- // using |public_key|, which is a DER-encoded SubjectPublicKeyInfo.
- // If |public_key| refers to an unsupported public key, returns NULL.
- // |description| is a textual description of the log.
- static scoped_refptr<const CTLogVerifier> Create(
- const base::StringPiece& public_key,
- std::string description);
- // Returns the log's key ID (RFC6962, Section 3.2)
- const std::string& key_id() const { return key_id_; }
- // Returns the log's human-readable description.
- const std::string& description() const { return description_; }
- // Verifies that |sct| is valid for |entry| and was signed by this log.
- bool Verify(const ct::SignedEntryData& entry,
- const ct::SignedCertificateTimestamp& sct) const;
- // Verifies that |signed_tree_head| is a valid Signed Tree Head (RFC 6962,
- // Section 3.5) for this log.
- bool VerifySignedTreeHead(const ct::SignedTreeHead& signed_tree_head) const;
- // Verifies that |proof| is a valid consistency proof (RFC 6962, Section
- // 2.1.2) for this log, and which proves that |old_tree_hash| has
- // been fully incorporated into the Merkle tree represented by
- // |new_tree_hash|.
- bool VerifyConsistencyProof(const ct::MerkleConsistencyProof& proof,
- const std::string& old_tree_hash,
- const std::string& new_tree_hash) const;
- // Verifies that |proof| is a valid audit proof (RFC 6962, Section 2.1.1) for
- // this log, and which proves that the certificate represented by |leaf_hash|
- // has been incorporated into the Merkle tree represented by |root_hash|.
- // Returns true if verification succeeds, false otherwise.
- bool VerifyAuditProof(const ct::MerkleAuditProof& proof,
- const std::string& root_hash,
- const std::string& leaf_hash) const;
- private:
- FRIEND_TEST_ALL_PREFIXES(CTLogVerifierTest, VerifySignature);
- friend class base::RefCountedThreadSafe<CTLogVerifier>;
- explicit CTLogVerifier(std::string description);
- ~CTLogVerifier();
- // Performs crypto-library specific initialization.
- bool Init(const base::StringPiece& public_key);
- // Performs the underlying verification using the selected public key. Note
- // that |signature| contains the raw signature data (eg: without any
- // DigitallySigned struct encoding).
- bool VerifySignature(const base::StringPiece& data_to_sign,
- const base::StringPiece& signature) const;
- // Returns true if the signature and hash algorithms in |signature|
- // match those of the log
- bool SignatureParametersMatch(const ct::DigitallySigned& signature) const;
- std::string key_id_;
- std::string description_;
- ct::DigitallySigned::HashAlgorithm hash_algorithm_ =
- ct::DigitallySigned::HASH_ALGO_NONE;
- ct::DigitallySigned::SignatureAlgorithm signature_algorithm_ =
- ct::DigitallySigned::SIG_ALGO_ANONYMOUS;
- raw_ptr<EVP_PKEY> public_key_ = nullptr;
- };
- } // namespace net
- #endif // NET_CERT_CT_LOG_VERIFIER_H_
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