1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "crypto/ec_signature_creator_impl.h"
10 #include "base/logging.h"
11 #include "crypto/ec_private_key.h"
12 #include "crypto/openssl_util.h"
13 #include "third_party/boringssl/src/include/openssl/bn.h"
14 #include "third_party/boringssl/src/include/openssl/ec.h"
15 #include "third_party/boringssl/src/include/openssl/ecdsa.h"
16 #include "third_party/boringssl/src/include/openssl/evp.h"
17 #include "third_party/boringssl/src/include/openssl/sha.h"
21 ECSignatureCreatorImpl::ECSignatureCreatorImpl(ECPrivateKey* key)
26 ECSignatureCreatorImpl::~ECSignatureCreatorImpl() = default;
28 bool ECSignatureCreatorImpl::Sign(const uint8_t* data,
30 std::vector<uint8_t>* signature) {
31 OpenSSLErrStackTracer err_tracer(FROM_HERE);
32 bssl::ScopedEVP_MD_CTX ctx;
35 !EVP_DigestSignInit(ctx.get(), nullptr, EVP_sha256(), nullptr,
37 !EVP_DigestSignUpdate(ctx.get(), data, data_len) ||
38 !EVP_DigestSignFinal(ctx.get(), nullptr, &sig_len)) {
42 signature->resize(sig_len);
43 if (!EVP_DigestSignFinal(ctx.get(), &signature->front(), &sig_len))
46 // NOTE: A call to EVP_DigestSignFinal() with a nullptr second parameter
47 // returns a maximum allocation size, while the call without a nullptr
48 // returns the real one, which may be smaller.
49 signature->resize(sig_len);
53 bool ECSignatureCreatorImpl::DecodeSignature(
54 const std::vector<uint8_t>& der_sig,
55 std::vector<uint8_t>* out_raw_sig) {
56 OpenSSLErrStackTracer err_tracer(FROM_HERE);
57 // Create ECDSA_SIG object from DER-encoded data.
58 bssl::UniquePtr<ECDSA_SIG> ecdsa_sig(
59 ECDSA_SIG_from_bytes(der_sig.data(), der_sig.size()));
63 // The result is made of two 32-byte vectors.
64 const size_t kMaxBytesPerBN = 32;
65 std::vector<uint8_t> result(2 * kMaxBytesPerBN);
67 if (!BN_bn2bin_padded(&result[0], kMaxBytesPerBN, ecdsa_sig->r) ||
68 !BN_bn2bin_padded(&result[kMaxBytesPerBN], kMaxBytesPerBN,
72 out_raw_sig->swap(result);