Abstracts SHA256 context for NSS / OpenSSL.

base/crypto/secure_hash_nss.cc

Index: base/crypto/secure_hash_nss.cc
diff --git a/base/crypto/secure_hash_nss.cc b/base/crypto/secure_hash_nss.cc
new file mode 100644
index 0000000000000000000000000000000000000000..436867ee2ec2f4bf49c5db9b34e9d5fd19283208
--- /dev/null
+++ b/base/crypto/secure_hash_nss.cc
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+// Copyright (c) 2011 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/secure_hash.h"
+
+#include "base/logging.h"
+#include "base/third_party/nss/blapi.h"
+#include "base/third_party/nss/sha256.h"
+
+namespace base {
+
+namespace {
+
+class SecureHashSHA256NSS : public SecureHash {
+ public:
+  SecureHashSHA256NSS() {
+    SHA256_Begin(&ctx_);
+  }
+
+  virtual ~SecureHashSHA256NSS() {
+  }
+
+  virtual void Update(const void* input, size_t len) {
+    SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
+  }
+
+  virtual void Finish(void* output, size_t len) {
+    SHA256_End(&ctx_, static_cast<unsigned char*>(output), NULL,
+               static_cast<unsigned int>(len));
+  }
+
+ private:
+  SHA256Context ctx_;
+};
+
+}  // namespace
+
+SecureHash* SecureHash::Create(Algorithm algorithm) {
+  switch (algorithm) {
+    case SHA256:
+      return new SecureHashSHA256NSS();
+    default:
+      NOTIMPLEMENTED();
+      return NULL;
+  }
+}
+
+}  // namespace base