Add Mac implementations of new SymmetricKey and Encryptor classes.

base/crypto/cssm_init.h

Index: base/crypto/cssm_init.h
diff --git a/base/crypto/cssm_init.h b/base/crypto/cssm_init.h
index 2637542bafd20349518594af723c163586db163a..721b2e8699cc729d1d15ba99eb953c69255d0a0d 100644
--- a/base/crypto/cssm_init.h
+++ b/base/crypto/cssm_init.h
@@ -17,9 +17,15 @@ namespace base {
 // ever be initialized once.  CSSM will be properly shut down on program exit.
 void EnsureCSSMInit();
 
+// Returns the shared CSP handle used by CSSM functions.
+CSSM_CSP_HANDLE GetSharedCSPHandle();
+
 // Set of pointers to memory function wrappers that are required for CSSM
 extern const CSSM_API_MEMORY_FUNCS kCssmMemoryFunctions;
 
+// Utility function to log an error message including the error name.
+void LogCSSMError(const char *function_name, CSSM_RETURN err);
+
 }  // namespace base
 
 #endif  // BASE_CRYPTO_CSSM_INIT_H_