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(.module:
[lux #*
["." host (#+ import:)]
[abstract
[codec (#+ Codec)]
[equivalence (#+ Equivalence)]
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." binary (#+ Binary)]
["." text
["%" format (#+ Format format)]
["." encoding]]
[number
["." i64]
["n" nat]]]
[type
abstract]])
## 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)
(import: java/security/MessageDigest
["#::."
(#static getInstance [java/lang/String] java/security/MessageDigest)
(digest [[byte]] [byte])])
(abstract: #export SHA-1 Any)
(abstract: #export MD5 Any)
(abstract: #export (Hash h)
Binary
(def: #export data
(All [h] (-> (Hash h) Binary))
(|>> :representation))
(template [<name> <kind> <algorithm>]
[(def: #export (<name> value)
(-> Binary (Hash <kind>))
(|> (java/security/MessageDigest::getInstance [<algorithm>])
(java/security/MessageDigest::digest [value])
:abstraction))]
[sha-1 ..SHA-1 "SHA-1"]
[md5 ..MD5 "MD5"]
)
(def: encode
(Format Binary)
(binary.fold (function (_ byte representation)
(let [hex (\ n.hex encode byte)
hex (case (text.size hex)
1 (format "0" hex)
_ hex)]
(format representation hex)))
""))
(template [<factor> <name>]
[(def: <name>
Nat
<factor>)]
[20 sha-1::size]
[16 md5::size]
)
(def: hex-per-byte
2)
(def: hex-per-chunk
(n.* hex-per-byte i64.bytes-per-i64))
(exception: #export (not-a-hash {size Nat} {value Text})
(exception.report
["Pseudo hash" (%.text value)]
["Expected size" (%.nat size)]
["Actual size" (%.nat (text.size value))]))
(template [<name> <size>]
[(exception: #export (<name> {data Binary})
(exception.report
["Pseudo hash" (%.text (..encode data))]
["Expected size" (%.nat <size>)]
["Actual size" (%.nat (binary.size data))]))]
[not-a-sha-1 ..sha-1::size]
[not-a-md5 ..md5::size]
)
(template [<name> <kind> <size> <exception>]
[(def: #export (<name> data)
(-> Binary (Try (Hash <kind>)))
(if (n.= <size> (binary.size data))
(#try.Success (:abstraction data))
(exception.throw <exception> [data])))]
[as-sha-1 SHA-1 ..sha-1::size ..not-a-sha-1]
[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: (decode 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 [input encoded
chunk 0
output (binary.create hash-size)]
(let [index (n.* chunk i64.bytes-per-i64)]
(case (text.split ..hex-per-chunk input)
(#.Some [head tail])
(do try.monad
[head (\ n.hex decode head)
output (binary.write/64 index head output)]
(recur tail (inc chunk) output))
#.None
(case (..hash-size input)
0 (constructor output)
(^template [<size> <write>]
[<size>
(do try.monad
[head (\ n.hex decode input)
output (<write> index head output)]
(constructor output))])
([1 binary.write/8]
[2 binary.write/16]
[4 binary.write/32])
_ (exception.throw ..not-a-hash [(..encoding-size size) encoded])))))
(exception.throw ..not-a-hash [(..encoding-size size) encoded]))))
(template [<codec> <hash> <nat> <constructor>]
[(structure: #export <codec>
(Codec Text (Hash <hash>))
(def: encode (|>> :representation ..encode))
(def: decode (..decode <nat> <constructor>)))]
[sha-1-codec SHA-1 ..sha-1::size ..as-sha-1]
[md5-codec MD5 ..md5::size ..as-md5]
)
(structure: #export equivalence
(All [h] (Equivalence (Hash h)))
(def: (= reference subject)
(\ binary.equivalence =
(:representation reference)
(:representation subject))))
)
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