[webcrypto] Add RSA public key SPKI import/export for NSS.

content/renderer/webcrypto/webcrypto_impl_openssl.cc

 // Copyright 2013 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 "content/renderer/webcrypto/webcrypto_impl.h"
 
 #include <vector>
 #include <openssl/aes.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
@@ skipping 312 matching lines @@
   if (algorithm_or_null.isNull())
     return false;
   const blink::WebCryptoAlgorithm& algorithm = algorithm_or_null;
 
   // TODO(padolph): Support all relevant alg types and then remove this gate.
   if (algorithm.id() != blink::WebCryptoAlgorithmIdHmac &&
       algorithm.id() != blink::WebCryptoAlgorithmIdAesCbc) {
     return false;
   }
 
-  // TODO(padolph): Need to split handling for symmetric (raw or jwk format) and
-  // asymmetric (jwk, spki, or pkcs8 format) keys.
+  // TODO(padolph): Need to split handling for symmetric
   // Currently only supporting symmetric.
 
-  // TODO(padolph): jwk handling. Define precedence between jwk contents and
-  // this method's parameters, e.g. 'alg' in jwk vs algorithm.id(). Who wins if
-  // they differ? (jwk, probably)
-
   // Symmetric keys are always type secret
   blink::WebCryptoKeyType type = blink::WebCryptoKeyTypeSecret;
 
   const unsigned char* raw_key_data;
   unsigned raw_key_data_size;
   switch (format) {
     case blink::WebCryptoKeyFormatRaw:
       raw_key_data = key_data;
       raw_key_data_size = key_data_size;
       // The NSS implementation fails when importing a raw AES key with a length
@@ skipping 11 matching lines @@
       return false;
   }
 
   *key = blink::WebCryptoKey::create(
       new SymKeyHandle(raw_key_data, raw_key_data_size),
       type, extractable, algorithm, usage_mask);
 
   return true;
 }
 
+bool WebCryptoImpl::ExportKeyInternal(
+    blink::WebCryptoKeyFormat format,
+    const blink::WebCryptoKey& key,
+    blink::WebArrayBuffer* buffer) {
+  // TODO(padolph): Implement raw export
+  // TODO(padolph): Implement spki export
+  // TODO(padolph): Implement pkcs8 export
+  // TODO(padolph): Implement jwk export
+  return false;
+}
+
 bool WebCryptoImpl::SignInternal(
     const blink::WebCryptoAlgorithm& algorithm,
     const blink::WebCryptoKey& key,
     const unsigned char* data,
     unsigned data_size,
     blink::WebArrayBuffer* buffer) {
 
   blink::WebArrayBuffer result;
 
   switch (algorithm.id()) {
@@ skipping 100 matching lines @@
 
       break;
     }
     default:
       return false;
   }
   return true;
 }
 
 }  // namespace content