19 lines
668 B
Haskell
19 lines
668 B
Haskell
module Crypto.Cipher.Utils
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( validateKeySize
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) where
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import Crypto.Error
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import Crypto.Cipher.Types
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import Crypto.Internal.Imports
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import Data.ByteArray as BA
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validateKeySize :: (ByteArrayAccess key, Cipher cipher) => cipher -> key -> CryptoFailable key
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validateKeySize c k = if validKeyLength
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then CryptoPassed k
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else CryptoFailed CryptoError_KeySizeInvalid
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where keyLength = BA.length k
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validKeyLength = case cipherKeySize c of
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KeySizeRange low high -> keyLength >= low && keyLength <= high
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KeySizeEnum lengths -> keyLength `elem` lengths
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KeySizeFixed s -> keyLength == s |