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32 lines
1.1 KiB
32 lines
1.1 KiB
// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "util/crypto/digest_sign.h"
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namespace openscreen {
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ErrorOr<std::string> SignData(const EVP_MD* digest,
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EVP_PKEY* private_key,
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absl::Span<const uint8_t> data) {
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bssl::ScopedEVP_MD_CTX ctx;
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if (!EVP_DigestSignInit(ctx.get(), nullptr, digest, nullptr, private_key)) {
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return Error::Code::kEVPInitializationError;
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}
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size_t signature_length = 0;
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if ((EVP_DigestSign(ctx.get(), nullptr, &signature_length, data.data(),
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data.size()) != 1) ||
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signature_length == 0) {
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return Error::Code::kEVPInitializationError;
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}
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std::string signature(signature_length, 0);
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if (EVP_DigestSign(ctx.get(), reinterpret_cast<uint8_t*>(&signature[0]),
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&signature_length, data.data(), data.size()) != 1) {
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return Error::Code::kCreateSignatureFailed;
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}
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return signature;
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}
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} // namespace openscreen
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