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// Copyright 2025 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_SIGN_H_
#define CRYPTO_SIGN_H_
#include "base/containers/span.h"
#include "crypto/crypto_export.h"
#include "crypto/keypair.h"
#include "third_party/boringssl/src/include/openssl/base.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
namespace crypto::sign {
enum SignatureKind {
RSA_PKCS1_SHA1,
RSA_PKCS1_SHA256,
// RSA-PSS with SHA-256 as both the signing hash and the MGF-1 hash, with a
// salt length of 32.
RSA_PSS_SHA256,
ECDSA_SHA256,
};
// One-shot signature function: produce a signature of `data` using `key`.
CRYPTO_EXPORT std::vector<uint8_t> Sign(SignatureKind kind,
const crypto::keypair::PrivateKey& key,
base::span<const uint8_t> data);
// One-shot verification function: check a signature and return whether it is
// valid.
[[nodiscard]] CRYPTO_EXPORT bool Verify(SignatureKind kind,
const crypto::keypair::PublicKey& key,
base::span<const uint8_t> data,
base::span<const uint8_t> signature);
// A streaming signer interface. Calling Finish() produces the final signature.
class CRYPTO_EXPORT Signer {
public:
Signer(SignatureKind kind, crypto::keypair::PrivateKey key);
~Signer();
// Put more data into the signing function.
void Update(base::span<const uint8_t> data);
// Finish the signature and return the signature value. After this is called,
// the Signer cannot be used any more.
std::vector<uint8_t> Finish();
private:
crypto::keypair::PrivateKey key_;
bssl::UniquePtr<EVP_MD_CTX> sign_context_;
};
// A streaming verifier interface. Calling Finish() checks the signature.
class CRYPTO_EXPORT Verifier {
public:
Verifier(SignatureKind kind,
crypto::keypair::PublicKey key,
base::span<const uint8_t> signature);
~Verifier();
// Put more data into the verification function.
void Update(base::span<const uint8_t> data);
// Finish the verification and return whether the signature matched the
// expected value provided at construction time. After this is called, the
// Verifier cannot be used any more.
[[nodiscard]] bool Finish();
private:
crypto::keypair::PublicKey key_;
std::vector<uint8_t> signature_;
bssl::UniquePtr<EVP_MD_CTX> verify_context_;
};
} // namespace crypto::sign
#endif // CRYPTO_SIGN_H_
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