Reland "Cut down /crypto and switch what is left of it to boringssl".

crypto/ec_signature_creator_openssl.cc

-// Copyright (c) 2012 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 "crypto/ec_signature_creator_impl.h"
-
-#include <openssl/bn.h>
-#include <openssl/ec.h>
-#include <openssl/ecdsa.h>
-#include <openssl/evp.h>
-#include <openssl/sha.h>
-
-#include "base/logging.h"
-#include "crypto/ec_private_key.h"
-#include "crypto/openssl_util.h"
-#include "crypto/scoped_openssl_types.h"
-
-namespace crypto {
-
-ECSignatureCreatorImpl::ECSignatureCreatorImpl(ECPrivateKey* key)
-    : key_(key), signature_len_(0) {
-  EnsureOpenSSLInit();
-}
-
-ECSignatureCreatorImpl::~ECSignatureCreatorImpl() {}
-
-bool ECSignatureCreatorImpl::Sign(const uint8* data,
-                                  int data_len,
-                                  std::vector<uint8>* signature) {
-  OpenSSLErrStackTracer err_tracer(FROM_HERE);
-  ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
-  size_t sig_len = 0;
-  if (!ctx.get() ||
-      !EVP_DigestSignInit(ctx.get(), NULL, EVP_sha256(), NULL, key_->key()) ||
-      !EVP_DigestSignUpdate(ctx.get(), data, data_len) ||
-      !EVP_DigestSignFinal(ctx.get(), NULL, &sig_len)) {
-    return false;
-  }
-
-  signature->resize(sig_len);
-  if (!EVP_DigestSignFinal(ctx.get(), &signature->front(), &sig_len))
-    return false;
-
-  // NOTE: A call to EVP_DigestSignFinal() with a NULL second parameter returns
-  // a maximum allocation size, while the call without a NULL returns the real
-  // one, which may be smaller.
-  signature->resize(sig_len);
-  return true;
-}
-
-bool ECSignatureCreatorImpl::DecodeSignature(const std::vector<uint8>& der_sig,
-                                             std::vector<uint8>* out_raw_sig) {
-  OpenSSLErrStackTracer err_tracer(FROM_HERE);
-  // Create ECDSA_SIG object from DER-encoded data.
-  const unsigned char* der_data = &der_sig.front();
-  ScopedECDSA_SIG ecdsa_sig(
-      d2i_ECDSA_SIG(NULL, &der_data, static_cast<long>(der_sig.size())));
-  if (!ecdsa_sig.get())
-    return false;
-
-  // The result is made of two 32-byte vectors.
-  const size_t kMaxBytesPerBN = 32;
-  std::vector<uint8> result(2 * kMaxBytesPerBN);
-
-  if (!BN_bn2bin_padded(&result[0], kMaxBytesPerBN, ecdsa_sig->r) ||
-      !BN_bn2bin_padded(&result[kMaxBytesPerBN], kMaxBytesPerBN,
-                        ecdsa_sig->s)) {
-    return false;
-  }
-  out_raw_sig->swap(result);
-  return true;
-}
-
-}  // namespace crypto