From 80981600a0994ba36d3867d5ada55b5ea5a3d9cb Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Sun, 17 Apr 2011 11:13:54 -0400
Subject: looked up HMAC block size details

---
 Crypto.hs | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'Crypto.hs')

diff --git a/Crypto.hs b/Crypto.hs
index 12c70ef04..25a87c3ad 100644
--- a/Crypto.hs
+++ b/Crypto.hs
@@ -48,6 +48,9 @@ import CryptoTypes
 {- The first half of a Cipher is used for HMAC; the remainder
  - is used as the GPG symmetric encryption passphrase.
  -
+ - HMAC SHA1 needs only 64 bytes. The remainder is for expansion,
+ - perhaps to HMAC SHA512, which needs 128 bytes (ideally).
+ -
  - 256 is enough for gpg's symetric cipher; unlike weaker public key
  - crypto, the key does not need to be too large.
  -}
-- 
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