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looked up HMAC block size details

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Joey Hess 2011-04-17 11:13:54 -04:00
parent eafb519592
commit 80981600a0
1 changed files with 3 additions and 0 deletions
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Crypto.hs
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@ -48,6 +48,9 @@ import CryptoTypes
{- The first half of a Cipher is used for HMAC; the remainder {- The first half of a Cipher is used for HMAC; the remainder
- is used as the GPG symmetric encryption passphrase. - 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 - 256 is enough for gpg's symetric cipher; unlike weaker public key
- crypto, the key does not need to be too large. - crypto, the key does not need to be too large.
-} -}