Implement the signature verification API.

base/crypto/cssm_init.cc

Index: base/crypto/cssm_init.cc
===================================================================
--- base/crypto/cssm_init.cc	(revision 0)
+++ base/crypto/cssm_init.cc	(revision 0)
@@ -0,0 +1,72 @@
+// Copyright (c) 2009 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 "base/crypto/cssm_init.h"
+
+#include <Security/cssm.h>
+
+#include "base/logging.h"
+#include "base/singleton.h"
+
+// When writing crypto code for Mac OS X, you may find the following
+// documentation useful:
+// - Common Security: CDSA and CSSM, Version 2 (with corrigenda)
+//   http://www.opengroup.org/security/cdsa.htm
+// - Apple Cryptographic Service Provider Functional Specification
+// - CryptoSample: http://developer.apple.com/SampleCode/CryptoSample/
+
+namespace {
+
+class CSSMInitSingleton {
+ public:
+  CSSMInitSingleton() : inited_(false), loaded_(false) {
+    static CSSM_VERSION version = {2, 0};
+    // TODO(wtc): what should our caller GUID be?
+    static const CSSM_GUID test_guid = {
+      0xFADE, 0, 0, { 1, 2, 3, 4, 5, 6, 7, 0 }
+    };
+    CSSM_RETURN crtn;
+    CSSM_PVC_MODE pvc_policy = CSSM_PVC_NONE;
+    crtn = CSSM_Init(&version, CSSM_PRIVILEGE_SCOPE_NONE, &test_guid,
+                     CSSM_KEY_HIERARCHY_NONE, &pvc_policy, NULL);
+    if (crtn) {
+      NOTREACHED();
+      return;
+    }
+    inited_ = true;
+
+    crtn = CSSM_ModuleLoad(&gGuidAppleCSP, CSSM_KEY_HIERARCHY_NONE, NULL, NULL);
+    if (crtn) {
+      NOTREACHED();
+      return;
+    }
+    loaded_ = true;
+  }
+
+  ~CSSMInitSingleton() {
+    CSSM_RETURN crtn;
+    if (loaded_) {
+      crtn = CSSM_ModuleUnload(&gGuidAppleCSP, NULL, NULL);
+      DCHECK(crtn == CSSM_OK);
+    }
+    if (inited_) {
+      crtn = CSSM_Terminate();
+      DCHECK(crtn == CSSM_OK);
+    }
+  }
+
+ private:
+  bool inited_;  // True if CSSM_Init has been called successfully.
+  bool loaded_;  // True if CSSM_ModuleLoad has been called successfully.
+};
+
+}  // namespace
+
+namespace base {
+
+void EnsureCSSMInit() {
+  Singleton<CSSMInitSingleton>::get();
+}
+
+}  // namespace base