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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef CTLogVerifier_h
#define CTLogVerifier_h
#include "pkix/Input.h"
#include "pkix/pkix.h"
#include "SignedCertificateTimestamp.h"
#include "SignedTreeHead.h"
namespace mozilla { namespace ct {
// Verifies Signed Certificate Timestamps (SCTs) provided by a specific log
// using the public key of that log. Assumes the SCT being verified
// matches the log by log key ID and signature parameters (an error is returned
// otherwise).
// The verification functions return Success if the provided SCT has passed
// verification, ERROR_BAD_SIGNATURE if failed verification, or other result
// on error.
class CTLogVerifier
{
public:
CTLogVerifier();
// Initializes the verifier with log-specific information.
// |subjectPublicKeyInfo| is a DER-encoded SubjectPublicKeyInfo.
// An error is returned if |subjectPublicKeyInfo| refers to an unsupported
// public key.
pkix::Result Init(pkix::Input subjectPublicKeyInfo);
// Returns the log's key ID, which is a SHA256 hash of its public key.
// See RFC 6962, Section 3.2.
const Buffer& keyId() const { return mKeyId; }
// Verifies that |sct| contains a valid signature for |entry|.
// |sct| must be signed by the verifier's log.
pkix::Result Verify(const LogEntry& entry,
const SignedCertificateTimestamp& sct);
// Verifies the signature in |sth|.
// |sth| must be signed by the verifier's log.
pkix::Result VerifySignedTreeHead(const SignedTreeHead& sth);
// Returns true if the signature and hash algorithms in |signature|
// match those of the log.
bool SignatureParametersMatch(const DigitallySigned& signature);
private:
// Performs the underlying verification using the log's public key. Note
// that |signature| contains the raw signature data (i.e. without any
// DigitallySigned struct encoding).
// Returns Success if passed verification, ERROR_BAD_SIGNATURE if failed
// verification, or other result on error.
pkix::Result VerifySignature(pkix::Input data, pkix::Input signature);
pkix::Result VerifySignature(const Buffer& data, const Buffer& signature);
Buffer mSubjectPublicKeyInfo;
Buffer mKeyId;
DigitallySigned::SignatureAlgorithm mSignatureAlgorithm;
};
} } // namespace mozilla::ct
#endif // CTLogVerifier_h
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