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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CRYPTO_SIGNATURE_VERIFIER_H_
#define CRYPTO_SIGNATURE_VERIFIER_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/containers/span.h"
#include "build/build_config.h"
#include "crypto/crypto_export.h"
namespace crypto {
// The SignatureVerifier class verifies a signature using a bare public key
// (as opposed to a certificate).
class CRYPTO_EXPORT SignatureVerifier {
public:
// The set of supported signature algorithms. Extend as required.
enum SignatureAlgorithm {
RSA_PKCS1_SHA1,
RSA_PKCS1_SHA256,
ECDSA_SHA256,
// This is RSA-PSS with SHA-256 as both signing hash and MGF-1 hash, and the
// salt length matching the hash length.
RSA_PSS_SHA256,
};
SignatureVerifier();
~SignatureVerifier();
// Streaming interface:
// Initiates a signature verification operation. This should be followed
// by one or more VerifyUpdate calls and a VerifyFinal call.
//
// The signature is encoded according to the signature algorithm.
//
// The public key is specified as a DER encoded ASN.1 SubjectPublicKeyInfo
// structure, which contains not only the public key but also its type
// (algorithm):
// SubjectPublicKeyInfo ::= SEQUENCE {
// algorithm AlgorithmIdentifier,
// subjectPublicKey BIT STRING }
bool VerifyInit(SignatureAlgorithm signature_algorithm,
base::span<const uint8_t> signature,
base::span<const uint8_t> public_key_info);
// Feeds a piece of the data to the signature verifier.
void VerifyUpdate(base::span<const uint8_t> data_part);
// Concludes a signature verification operation. Returns true if the
// signature is valid. Returns false if the signature is invalid or an
// error occurred.
bool VerifyFinal();
private:
void Reset();
std::vector<uint8_t> signature_;
struct VerifyContext;
std::unique_ptr<VerifyContext> verify_context_;
};
} // namespace crypto
#endif // CRYPTO_SIGNATURE_VERIFIER_H_
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