104 lines
3.9 KiB
Haskell
104 lines
3.9 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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-- |
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-- Module : Crypto.PubKey.HashDescr
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : experimental
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-- Portability : Good
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--
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-- Standard digests wrapped in ASN1 structure
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--
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module Crypto.PubKey.HashDescr
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(
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-- * Types
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HashFunction
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, HashDescr(..)
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-- * List of known hash description
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, hashDescrMD2
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, hashDescrMD5
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, hashDescrSHA1
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, hashDescrSHA224
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, hashDescrSHA256
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, hashDescrSHA384
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, hashDescrSHA512
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, hashDescrRIPEMD160
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) where
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import Data.ByteString.Char8 ()
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import Data.ByteString (ByteString)
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import qualified Data.ByteString as B
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import Crypto.Hash
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import qualified Crypto.Internal.ByteArray as B (convert)
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-- | A standard hash function returning a digest object
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type HashFunction = ByteString -> ByteString
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-- | Describe a hash function and a way to wrap the digest into
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-- an DER encoded ASN1 marshalled structure.
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data HashDescr = HashDescr { hashFunction :: HashFunction -- ^ hash function
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, digestToASN1 :: ByteString -> ByteString -- ^ convertion to an ASN1 wrapped digest bytestring
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}
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-- | Describe the MD2 hashing algorithm
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hashDescrMD2 :: HashDescr
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hashDescrMD2 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest MD2)
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, digestToASN1 = toHashWithInfo "\x30\x20\x30\x0c\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x02\x05\x00\x04\x10"
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}
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-- | Describe the MD5 hashing algorithm
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hashDescrMD5 :: HashDescr
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hashDescrMD5 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest MD5)
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, digestToASN1 = toHashWithInfo "\x30\x20\x30\x0c\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x05\x05\x00\x04\x10"
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}
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-- | Describe the SHA1 hashing algorithm
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hashDescrSHA1 :: HashDescr
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hashDescrSHA1 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest SHA1)
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, digestToASN1 = toHashWithInfo "\x30\x21\x30\x09\x06\x05\x2b\x0e\x03\x02\x1a\x05\x00\x04\x14"
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}
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-- | Describe the SHA224 hashing algorithm
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hashDescrSHA224 :: HashDescr
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hashDescrSHA224 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest SHA224)
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, digestToASN1 = toHashWithInfo "\x30\x2d\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x04\x05\x00\x04\x1c"
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}
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-- | Describe the SHA256 hashing algorithm
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hashDescrSHA256 :: HashDescr
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hashDescrSHA256 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest SHA256)
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, digestToASN1 = toHashWithInfo "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20"
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}
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-- | Describe the SHA384 hashing algorithm
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hashDescrSHA384 :: HashDescr
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hashDescrSHA384 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest SHA384)
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, digestToASN1 = toHashWithInfo "\x30\x41\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x02\x05\x00\x04\x30"
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}
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-- | Describe the SHA512 hashing algorithm
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hashDescrSHA512 :: HashDescr
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hashDescrSHA512 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest SHA512)
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, digestToASN1 = toHashWithInfo "\x30\x51\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x03\x05\x00\x04\x40"
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}
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-- | Describe the RIPEMD160 hashing algorithm
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hashDescrRIPEMD160 :: HashDescr
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hashDescrRIPEMD160 =
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HashDescr { hashFunction = B.convert . (hash :: ByteString -> Digest RIPEMD160)
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, digestToASN1 = toHashWithInfo "\x30\x21\x30\x09\x06\x05\x2b\x24\x03\x02\x01\x05\x00\x04\x14"
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}
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-- | Generate the marshalled structure with the following ASN1 structure:
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--
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-- Start Sequence
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-- ,Start Sequence
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-- ,OID oid
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-- ,Null
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-- ,End Sequence
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-- ,OctetString digest
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-- ,End Sequence
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--
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toHashWithInfo :: ByteString -> ByteString -> ByteString
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toHashWithInfo pre digest = pre `B.append` digest
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