[webcrypto] Add JWK RSA public key export for NSS.

content/child/webcrypto/platform_crypto_nss.cc

 // Copyright 2014 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/child/webcrypto/platform_crypto.h"
 
 #include <cryptohi.h>
 #include <pk11pub.h>
 #include <sechash.h>
 
@@ skipping 677 matching lines @@
     return Status::Error();
 
   DCHECK(spki_der->data);
   DCHECK(spki_der->len);
 
   *buffer = CreateArrayBuffer(spki_der->data, spki_der->len);
 
   return Status::Success();
 }
 
+Status ExportRsaPublicKey(PublicKey* key,
+                          blink::WebArrayBuffer* modulus,
+                          blink::WebArrayBuffer* public_exponent) {
+  DCHECK(key);
+  DCHECK(key->key());
+
+  if (key->key()->keyType != rsaKey)
+    return Status::ErrorUnsupported();
+
+  SECItem modulus_item = key->key()->u.rsa.modulus;
+  DCHECK(modulus_item.data);

[eroman, 2014/03/21 02:30:51]

Do these need to be proper returns?

[padolph, 2014/03/24 04:24:06]

Yes.

+  DCHECK(modulus_item.len);
+
+  SECItem public_exponent_item = key->key()->u.rsa.publicExponent;
+  DCHECK(public_exponent_item.data);
+  DCHECK(public_exponent_item.len);
+
+  *modulus = CreateArrayBuffer(modulus_item.data, modulus_item.len);
+  *public_exponent =
+      CreateArrayBuffer(public_exponent_item.data, public_exponent_item.len);
+
+  return Status::Success();
+}
+
 Status ImportKeyPkcs8(const blink::WebCryptoAlgorithm& algorithm,
                       const CryptoData& key_data,
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usage_mask,
                       blink::WebCryptoKey* key) {
 
   DCHECK(key);
 
   if (!key_data.byte_length())
     return Status::ErrorImportEmptyKeyData();
@@ skipping 615 matching lines @@
                                      key_algorithm,
                                      usage_mask);
   return Status::Success();
 }
 
 }  // namespace platform
 
 }  // namespace webcrypto
 
 }  // namespace content