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|
(.using
[library
[lux "*"
["[0]" ffi {"+" import:}]
[abstract
[codec {"+" Codec}]
[equivalence {"+" Equivalence}]
[monad {"+" do}]]
[control
["[0]" try {"+" Try}]
["[0]" exception {"+" exception:}]]
[data
["[0]" binary {"+" Binary}]
["[0]" text
["%" format {"+" Format format}]
["[0]" encoding]]]
[macro
["^" pattern]]
[math
[number
["n" nat]
["[0]" i64]]]
[type
[abstract {"-" pattern}]]]])
... 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]))
(abstract: .public SHA-1 Any)
(abstract: .public MD5 Any)
(abstract: .public (Hash h)
Binary
(def: .public data
(All (_ h) (-> (Hash h) Binary))
(|>> representation))
(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))]
[sha-1 ..SHA-1 "SHA-1"]
[md5 ..MD5 "MD5"]
)
(def: encoded
(Format Binary)
(binary.aggregate (function (_ byte representation)
(let [hex (# n.hex encoded 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: .public (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: .public (<name> [data Binary])
(exception.report
"Pseudo hash" (%.text (..encoded 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: .public (<name> data)
(-> Binary (Try (Hash <kind>)))
(if (n.= <size> (binary.size data))
{try.#Success (abstraction data)}
(exception.except <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: (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)]
(case (text.split_at ..hex_per_chunk input)
{.#Some [head tail]}
(do try.monad
[head (# n.hex decoded head)
output (binary.write/64! index head output)]
(again tail (++ chunk) output))
{.#None}
(case (..hash_size input)
0 (constructor output)
(^.template [<size> <write>]
[<size>
(do try.monad
[head (# n.hex decoded input)
output (<write> index head output)]
(constructor output))])
([1 binary.write/8!]
[2 binary.write/16!]
[4 binary.write/32!])
_ (exception.except ..not_a_hash [(..encoding_size size) encoded])))))
(exception.except ..not_a_hash [(..encoding_size size) encoded]))))
(template [<codec> <hash> <nat> <constructor>]
[(implementation: .public <codec>
(Codec Text (Hash <hash>))
(def: encoded (|>> representation ..encoded))
(def: decoded (..decoded <nat> <constructor>)))]
[sha-1_codec SHA-1 ..sha-1::size ..as_sha-1]
[md5_codec MD5 ..md5::size ..as_md5]
)
(implementation: .public equivalence
(All (_ h) (Equivalence (Hash h)))
(def: (= reference subject)
(# binary.equivalence =
(representation reference)
(representation subject))))
)
|
