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// Copyright 2019 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.
#include "util/crypto/digest_sign.h"
namespace openscreen {
ErrorOr<std::string> SignData(const EVP_MD* digest,
EVP_PKEY* private_key,
absl::Span<const uint8_t> data) {
bssl::ScopedEVP_MD_CTX ctx;
if (!EVP_DigestSignInit(ctx.get(), nullptr, digest, nullptr, private_key)) {
return Error::Code::kEVPInitializationError;
}
size_t signature_length = 0;
if ((EVP_DigestSign(ctx.get(), nullptr, &signature_length, data.data(),
data.size()) != 1) ||
signature_length == 0) {
return Error::Code::kEVPInitializationError;
}
std::string signature(signature_length, 0);
if (EVP_DigestSign(ctx.get(), reinterpret_cast<uint8_t*>(&signature[0]),
&signature_length, data.data(), data.size()) != 1) {
return Error::Code::kCreateSignatureFailed;
}
return signature;
}
} // namespace openscreen
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