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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/web_package/signed_web_bundles/ed25519_signature.h"
#include <algorithm>
#include "base/strings/stringprintf.h"
#include "third_party/boringssl/src/include/openssl/curve25519.h"
namespace web_package {
// We don't use `ED25519_SIGNATURE_LEN` in the header file, because we want to
// avoid including large BoringSSL headers in header files.
static_assert(Ed25519Signature::kLength == ED25519_SIGNATURE_LEN);
// static
base::expected<Ed25519Signature, std::string> Ed25519Signature::Create(
base::span<const uint8_t> bytes) {
auto sized_bytes = bytes.to_fixed_extent<kLength>();
if (!sized_bytes) {
return base::unexpected(base::StringPrintf(
"The signature has the wrong length. Expected %zu, but got %zu bytes.",
kLength, bytes.size()));
}
return Create(*sized_bytes);
}
// static
Ed25519Signature Ed25519Signature::Create(
base::span<const uint8_t, kLength> bytes) {
std::array<uint8_t, kLength> array;
std::ranges::copy(bytes, array.begin());
return Ed25519Signature(array);
}
Ed25519Signature::Ed25519Signature(std::array<uint8_t, kLength>& bytes)
: bytes_(bytes) {}
[[nodiscard]] bool Ed25519Signature::Verify(
base::span<const uint8_t> message,
const Ed25519PublicKey& public_key) const {
const std::array<uint8_t, ED25519_PUBLIC_KEY_LEN>& public_key_bytes =
public_key.bytes();
const std::array<uint8_t, ED25519_SIGNATURE_LEN>& signature_bytes = bytes();
return ED25519_verify(message.data(), message.size(), signature_bytes.data(),
public_key_bytes.data());
}
} // namespace web_package
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