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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
(.require
[library
[lux (.except)
["[0]" ffi (.only import)]
[abstract
[codec (.only Codec)]
[equivalence (.only Equivalence)]
[monad (.only do)]]
[control
["[0]" try (.only Try)]
["[0]" exception (.only Exception)]]
[data
["[0]" binary (.only Binary)]
["[0]" text (.only)
["%" \\format (.only Format format)]
["[0]" encoding]]]
[math
[number
["n" nat]
["[0]" i64]]]
[meta
[macro
["^" pattern]]
[type
["[0]" nominal (.except def)]]]]])
... TODO: Replace with pure-Lux implementations of these algorithms
... https://en.wikipedia.org/wiki/SHA-1#SHA-1_pseudocode
... https://en.wikipedia.org/wiki/MD5#Algorithm
(import java/lang/String
"[1]::[0]")
(import java/security/MessageDigest
"[1]::[0]"
("static" getInstance [java/lang/String] java/security/MessageDigest)
(digest [[byte]] [byte]))
(nominal.def .public SHA1 Any)
(nominal.def .public MD5 Any)
(nominal.def .public (Hash h)
Binary
(def .public data
(All (_ h) (-> (Hash h) Binary))
(|>> representation))
(with_template [<name> <kind> <algorithm>]
[(def .public (<name> value)
(-> Binary (Hash <kind>))
(|> (java/security/MessageDigest::getInstance [(ffi.as_string <algorithm>)])
(java/security/MessageDigest::digest [value])
abstraction))]
[sha1 ..SHA1 "SHA1"]
[md5 ..MD5 "MD5"]
)
(def encoded
(Format Binary)
(binary.mix (function (_ byte representation)
(let [hex (of n.hex encoded byte)
hex (when (text.size hex)
1 (format "0" hex)
_ hex)]
(format representation hex)))
""))
(with_template [<factor> <name>]
[(def <name>
Nat
<factor>)]
[20 sha1::size]
[16 md5::size]
)
(def hex_per_byte
2)
(def hex_per_chunk
(n.* hex_per_byte i64.bytes_per_i64))
(exception.def .public (not_a_hash [size value])
(Exception [Nat Text])
(exception.report
(list ["Pseudo hash" (%.text value)]
["Expected size" (%.nat size)]
["Actual size" (%.nat (text.size value))])))
(with_template [<name> <size>]
[(exception.def .public (<name> data)
(Exception Binary)
(exception.report
(list ["Pseudo hash" (%.text (..encoded data))]
["Expected size" (%.nat <size>)]
["Actual size" (%.nat (binary.size data))])))]
[not_a_sha1 ..sha1::size]
[not_a_md5 ..md5::size]
)
(with_template [<name> <kind> <size> <exception>]
[(def .public (<name> data)
(-> Binary (Try (Hash <kind>)))
(if (n.= <size> (binary.size data))
{try.#Success (abstraction data)}
(exception.except <exception> [data])))]
[as_sha1 SHA1 ..sha1::size ..not_a_sha1]
[as_md5 MD5 ..md5::size ..not_a_md5]
)
(def hash_size
(-> Text Nat)
(|>> text.size (n./ ..hex_per_byte)))
(def encoding_size
(-> Nat Nat)
(n.* ..hex_per_byte))
(def (decoded size constructor encoded)
(All (_ h)
(-> Nat (-> Binary (Try (Hash h)))
(-> Text (Try (Hash h)))))
(let [hash_size (..hash_size encoded)]
(if (n.= size hash_size)
(loop (again [input encoded
chunk 0
output (binary.empty hash_size)])
(let [index (n.* chunk i64.bytes_per_i64)]
(when (text.split_at ..hex_per_chunk input)
{.#Some [head tail]}
(do try.monad
[head (of n.hex decoded head)
output (binary.has_64! index head output)]
(again tail (++ chunk) output))
{.#None}
(when (..hash_size input)
0 (constructor output)
(^.with_template [<size> <write>]
[<size>
(do try.monad
[head (of n.hex decoded input)
output (<write> index head output)]
(constructor output))])
([1 binary.has_8!]
[2 binary.has_16!]
[4 binary.has_32!])
_ (exception.except ..not_a_hash [(..encoding_size size) encoded])))))
(exception.except ..not_a_hash [(..encoding_size size) encoded]))))
(with_template [<codec> <hash> <nat> <constructor>]
[(def .public <codec>
(Codec Text (Hash <hash>))
(implementation
(def encoded (|>> representation ..encoded))
(def decoded (..decoded <nat> <constructor>))))]
[sha1_codec SHA1 ..sha1::size ..as_sha1]
[md5_codec MD5 ..md5::size ..as_md5]
)
(def .public equivalence
(All (_ h) (Equivalence (Hash h)))
(implementation
(def (= reference subject)
(of binary.equivalence =
(representation reference)
(representation subject)))))
)
|
