mirror of
https://github.com/kidfromjupiter/nearby.git
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84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal/crypto_cros/ec_signature_creator_impl.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <vector>
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#include "internal/crypto_cros/ec_private_key.h"
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#include "internal/crypto_cros/openssl_util.h"
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#include <openssl/bn.h>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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namespace crypto {
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ECSignatureCreatorImpl::ECSignatureCreatorImpl(ECPrivateKey* key) : key_(key) {
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EnsureOpenSSLInit();
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}
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ECSignatureCreatorImpl::~ECSignatureCreatorImpl() = default;
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bool ECSignatureCreatorImpl::Sign(absl::Span<const uint8_t> data,
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std::vector<uint8_t>* signature) {
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OpenSSLErrStackTracer err_tracer;
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bssl::ScopedEVP_MD_CTX ctx;
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size_t sig_len = 0;
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if (!ctx.get() ||
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!EVP_DigestSignInit(ctx.get(), nullptr, EVP_sha256(), nullptr,
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key_->key()) ||
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!EVP_DigestSignUpdate(ctx.get(), data.data(), data.size()) ||
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!EVP_DigestSignFinal(ctx.get(), nullptr, &sig_len)) {
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return false;
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}
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signature->resize(sig_len);
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if (!EVP_DigestSignFinal(ctx.get(), &signature->front(), &sig_len))
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return false;
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// NOTE: A call to EVP_DigestSignFinal() with a nullptr second parameter
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// returns a maximum allocation size, while the call without a nullptr
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// returns the real one, which may be smaller.
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signature->resize(sig_len);
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return true;
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}
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bool ECSignatureCreatorImpl::DecodeSignature(
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const std::vector<uint8_t>& der_sig, std::vector<uint8_t>* out_raw_sig) {
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OpenSSLErrStackTracer err_tracer;
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// Create ECDSA_SIG object from DER-encoded data.
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bssl::UniquePtr<ECDSA_SIG> ecdsa_sig(
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ECDSA_SIG_from_bytes(der_sig.data(), der_sig.size()));
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if (!ecdsa_sig.get()) return false;
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// The result is made of two 32-byte vectors.
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const size_t kMaxBytesPerBN = 32;
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std::vector<uint8_t> result(2 * kMaxBytesPerBN);
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if (!BN_bn2bin_padded(&result[0], kMaxBytesPerBN, ecdsa_sig->r) ||
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!BN_bn2bin_padded(&result[kMaxBytesPerBN], kMaxBytesPerBN,
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ecdsa_sig->s)) {
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return false;
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}
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out_raw_sig->swap(result);
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return true;
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}
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} // namespace crypto
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