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[aes] fast track length == 0 with ECB encryption/decryption

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This commit is contained in:
Vincent Hanquez 2015-06-02 14:22:26 +01:00
parent c7068873c5
commit be75de64e1
1 changed files with 7 additions and 5 deletions
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12
Crypto/Cipher/AES/Primitive.hs
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@ -351,11 +351,13 @@ doECB :: ByteArray ba
=> (Ptr b -> Ptr AES -> CString -> CUInt -> IO ())
-> AES -> ba -> ba
doECB f ctx input
| r /= 0 = error $ "Encryption error: input length must be a multiple of block size (16). Its length is: " ++ (show len)
| otherwise = B.allocAndFreeze len $ \o ->
keyToPtr ctx $ \k ->
withByteArray input $ \i ->
f (castPtr o) k i (fromIntegral nbBlocks)
| len == 0 = B.empty
| r /= 0 = error $ "Encryption error: input length must be a multiple of block size (16). Its length is: " ++ (show len)
| otherwise =
B.allocAndFreeze len $ \o ->
keyToPtr ctx $ \k ->
withByteArray input $ \i ->
f (castPtr o) k i (fromIntegral nbBlocks)
where (nbBlocks, r) = len `quotRem` 16
len = B.length input