[webcrypto] Minor cleanup/consolidation of JWK source.

content/child/webcrypto/shared_crypto.cc

Index: content/child/webcrypto/shared_crypto.cc
diff --git a/content/child/webcrypto/shared_crypto.cc b/content/child/webcrypto/shared_crypto.cc
index af2beaca2a672fbbca28886ed65115dfb49e5112..92aa342b321eb3f78adeed61e5a47dff2e5bda21 100644
--- a/content/child/webcrypto/shared_crypto.cc
+++ b/content/child/webcrypto/shared_crypto.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "content/child/webcrypto/crypto_data.h"
+#include "content/child/webcrypto/jwk.h"
 #include "content/child/webcrypto/platform_crypto.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/webcrypto_util.h"
@@ -483,6 +484,21 @@ Status WrapKeyExportAndEncrypt(
       wrapping_algorithm, wrapping_key, CryptoData(exported_data), buffer);
 }
 
+// Returns the internal block size for SHA-*
+unsigned int ShaBlockSizeBytes(blink::WebCryptoAlgorithmId hash_id) {
+  switch (hash_id) {
+    case blink::WebCryptoAlgorithmIdSha1:
+    case blink::WebCryptoAlgorithmIdSha256:
+      return 64;
+    case blink::WebCryptoAlgorithmIdSha384:
+    case blink::WebCryptoAlgorithmIdSha512:
+      return 128;
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
 }  // namespace
 
 void Init() { platform::Init(); }