102 lines
3.6 KiB
Haskell
102 lines
3.6 KiB
Haskell
-- |
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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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HashDescr
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, runHashDescr
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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.Word
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import Crypto.Hash
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import qualified Crypto.Internal.ByteArray as B
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--
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-- ** Hack **
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--
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-- this happens to not need a real ASN1 encoder, because
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-- thanks to the digest being a specific size AND
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-- that the digest data is the last bytes in the encoding,
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-- this allows to just prepend the right prefix to the
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-- computed digest, to make it in the expected and valid shape.
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--
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-- Otherwise the expected structure is in the following form:
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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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hashDescr :: (B.ByteArray ba, HashAlgorithm hashAlg)
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=> hashAlg -- ^ hash algorithm to use
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-> [Word8] -- ^ the raw DER encoded ASN1 description of hash algorithm followed by the digest to be filled
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-> HashDescr hashAlg ba
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hashDescr hashAlg preASN1Descr =
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HashDescr (\input -> B.pack preASN1Descr `B.append` B.convert (hashWith hashAlg input))
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-- | A hash methods to generate a ASN.1 structure digest
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data HashDescr hashAlg ba = HashDescr { unHashDescr :: ba -> ba }
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-- | Run the digest function on some input and get the raw bytes
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runHashDescr :: (HashAlgorithm hashAlg, B.ByteArray ba) => HashDescr hashAlg ba -> ba -> ba
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runHashDescr h = unHashDescr h
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-- | Describe the MD2 hashing algorithm
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hashDescrMD2 :: B.ByteArray ba => HashDescr MD2 ba
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hashDescrMD2 =
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hashDescr MD2 [0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x02,0x05,0x00,0x04,0x10]
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-- | Describe the MD5 hashing algorithm
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hashDescrMD5 :: B.ByteArray ba => HashDescr MD5 ba
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hashDescrMD5 =
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hashDescr MD5 [0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x04,0x10]
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-- | Describe the SHA1 hashing algorithm
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hashDescrSHA1 :: B.ByteArray ba => HashDescr SHA1 ba
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hashDescrSHA1 =
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hashDescr SHA1 [0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x0e,0x03,0x02,0x1a,0x05,0x00,0x04,0x14]
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-- | Describe the SHA224 hashing algorithm
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hashDescrSHA224 :: B.ByteArray ba => HashDescr SHA224 ba
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hashDescrSHA224 =
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hashDescr SHA224 [0x30,0x2d,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x04,0x05,0x00,0x04,0x1c]
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-- | Describe the SHA256 hashing algorithm
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hashDescrSHA256 :: B.ByteArray ba => HashDescr SHA256 ba
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hashDescrSHA256 =
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hashDescr SHA256 [0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20]
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-- | Describe the SHA384 hashing algorithm
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hashDescrSHA384 :: B.ByteArray ba => HashDescr SHA384 ba
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hashDescrSHA384 =
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hashDescr SHA384 [0x30,0x41,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x02,0x05,0x00,0x04,0x30]
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-- | Describe the SHA512 hashing algorithm
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hashDescrSHA512 :: B.ByteArray ba => HashDescr SHA512 ba
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hashDescrSHA512 =
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hashDescr SHA512 [0x30,0x51,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x03,0x05,0x00,0x04,0x40]
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-- | Describe the RIPEMD160 hashing algorithm
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hashDescrRIPEMD160 :: B.ByteArray ba => HashDescr RIPEMD160 ba
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hashDescrRIPEMD160 =
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hashDescr RIPEMD160 [0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x24,0x03,0x02,0x01,0x05,0x00,0x04,0x14]
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