Add a method to HMAC to indicate how large a digest it produces.

Review URL: http://codereview.chromium.org/6904148

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@83681 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/crypto/hmac.h b/crypto/hmac.h
index 816bf60..fcd2657 100644
--- a/crypto/hmac.h
+++ b/crypto/hmac.h
@@ -30,8 +30,13 @@ class HMAC {
   explicit HMAC(HashAlgorithm hash_alg);
   ~HMAC();
 
+  size_t DigestLength() const;
+
+  // TODO(abarth): Add a PreferredKeyLength() member function.
+
   // Initializes this instance using |key| of the length |key_length|. Call Init
   // only once. It returns false on the second or later calls.
+  // TODO(abarth): key_length should be a size_t.
   bool Init(const unsigned char* key, int key_length);
 
   // Initializes this instance using |key|. Call Init only once. It returns
@@ -44,6 +49,7 @@ class HMAC {
   // Calculates the HMAC for the message in |data| using the algorithm supplied
   // to the constructor and the key supplied to the Init method. The HMAC is
   // returned in |digest|, which has |digest_length| bytes of storage available.
+  // TODO(abarth): digest_length should be a size_t.
   bool Sign(const std::string& data, unsigned char* digest, int digest_length);
 
   // TODO(albertb): Add a Verify method.