Move base64-urlsafe helpers to jwk.{cc,h}

content/child/webcrypto/jwk.h

 // 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.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_JWK_H_
 #define CONTENT_CHILD_WEBCRYPTO_JWK_H_
 
 #include <stdint.h>
 #include <vector>
 
+#include "base/strings/string_piece.h"
 #include "base/values.h"
+#include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebArrayBuffer.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace content {
 
 namespace webcrypto {
 
 class CryptoData;
 class Status;
@@ skipping 91 matching lines @@
 //     present.
 //   * expected_usage_mask must be a subset of the JWK's "key_ops" if present.
 Status ReadRsaKeyJwk(const CryptoData& key_data,
                      const std::string& expected_algorithm,
                      bool expected_extractable,
                      blink::WebCryptoKeyUsageMask expected_usage_mask,
                      JwkRsaInfo* result);
 
 const char* GetJwkHmacAlgorithmName(blink::WebCryptoAlgorithmId hash);
 
+// This function decodes unpadded 'base64url' encoded data, as described in
+// RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5.
+CONTENT_EXPORT bool Base64DecodeUrlSafe(const std::string& input,
+                                        std::string* output);
+
+// Returns an unpadded 'base64url' encoding of the input data, the opposite of
+// Base64DecodeUrlSafe() above.
+CONTENT_EXPORT std::string Base64EncodeUrlSafe(const base::StringPiece& input);
+CONTENT_EXPORT std::string Base64EncodeUrlSafe(
+    const std::vector<uint8_t>& input);
+
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_JWK_H_