cipher-blowfish alternatives and similar packages
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Documentation: crypto-cipher-types on hackage
Here a simple example on how to encrypt using ECB, with the AES256 cipher:
import Crypto.Cipher.Types import Crypto.Cipher -- the bytestring need to have a length of 32 bytes -- otherwise the simplified error handling will raise an exception. initAES256 :: ByteString -> AES256 initAES256 = either (error . show) cipherInit . makeKey -- real code would not create a new context every time, but -- initialize once, and reuse the context. cryptKey key msg = encryptECB ctx msg where ctx = initAES256 key
And another using CBC mode with Blowfish cipher:
import Crypto.Cipher.Types import Crypto.Cipher initBlowfish :: ByteString -> Blowfish initBlowfish = either (error . show) cipherInit . makeKey cryptKey key iv msg = encryptCBC ctx (makeIV iv) msg where ctx = initBlowfish key
crypto-cipher-types use Phantom types for Keys and IVs, which are all the same underlaying types but allow to differentiate between valid keys of differents ciphers.
For example a "Key Blowfish" is different than a "Key AES256". This is similar for IV.
One must use makeIV and makeKey to create those types.
makeKey "\x00\x11\x22\x33\x44\x55\x66" :: Either KeyError (Key MyCipher)
makeIV "\x00\x11\x22\x33\x44" :: Maybe (IV MyCipher)
In simple context, the haskell compiler cannot infer the cipher that need to be use, and the user need to add annotation in signatures as to which cipher need to be chosen.
This only need to be done, either on the initialized Cipher (cipherInit), the Key or the IV.
Tests for blockciphers are already all included in crypto-cipher-tests.
import Crypto.Cipher.Tests main = defaultMain [ testBlockCipher defaultKATs (undefined :: BlockCipherType) ]
- cipher-des: slow
- cipher-blowfish: slow
- cipher-camellia: slow, endianness problem