Update monet.

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