blob: fc731c8321f3585a72f3ba9ca13312ba12b14596 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
(.module:
[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]]]
[math
[number
["n" nat]
["[0]" i64]]]
[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
["[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 [<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 [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))))
)
|
