crypto: Add critpto_api.h and annotate the current exports needed to run

crypto/signature_verifier.h

 // Copyright (c) 2011 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.
 
 #ifndef CRYPTO_SIGNATURE_VERIFIER_H_
 #define CRYPTO_SIGNATURE_VERIFIER_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #if defined(USE_NSS)
 #include <cryptoht.h>
 #elif defined(OS_MACOSX)
 #include <Security/cssm.h>
 #endif
 
 #include <vector>
 
 #include "base/basictypes.h"
+#include "crypto/crypto_api.h"
 
 #if defined(OS_WIN)
 #include "crypto/scoped_capi_types.h"
 #endif
 
 namespace crypto {
 
 // The SignatureVerifier class verifies a signature using a bare public key
 // (as opposed to a certificate).
-class SignatureVerifier {
+class CRYPTO_API SignatureVerifier {
  public:
   SignatureVerifier();
   ~SignatureVerifier();
 
   // Streaming interface:
 
   // Initiates a signature verification operation.  This should be followed
   // by one or more VerifyUpdate calls and a VerifyFinal call.
   //
   // The signature algorithm is specified as a DER encoded ASN.1
@@ skipping 59 matching lines @@
 
   ScopedHCRYPTHASH hash_object_;
 
   ScopedHCRYPTKEY public_key_;
 #endif
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_SIGNATURE_VERIFIER_H_