commit 7dad93b6552a2253ad6e7a493ddf0c9113806712
author Shawn Willden <swillden@google.com> Thu Feb 05 10:20:47 2015 -0700
committer Shawn Willden <swillden@google.com> Wed Mar 04 13:22:16 2015 -0700
tree babf95d2be523623ec9c8c92300febdec119f7ef
parent f0f68b976b0ffac10d3e0efddc5bee38fd9d1ea3

Implement symmetric key import.

Change-Id: I902933c06c74c7b3b434873f53fb2c767d3b9721

hmac_key.h

diff --git a/hmac_key.h b/hmac_key.h
index f94dea8..6c482bb 100644
--- a/hmac_key.h
+++ b/hmac_key.h
@@ -22,9 +22,14 @@
 namespace keymaster {
 
 class HmacKey : public SymmetricKey {
+    static const size_t MAX_HMAC_KEY_SIZE = 256; /* Arbitrary limit, for DoS prevention */
+
   public:
     HmacKey(const AuthorizationSet& auths) : SymmetricKey(auths) {}
     HmacKey(const UnencryptedKeyBlob& blob, keymaster_error_t* error) : SymmetricKey(blob, error) {}
+
+  private:
+    virtual bool size_supported(size_t key_size) { return key_size < MAX_HMAC_KEY_SIZE; }
 };
 
 }  // namespace keymaster