/
sha1.cr
171 lines (144 loc) · 4.57 KB
/
sha1.cr
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
168
169
170
171
require "./base"
# Implements the SHA1 digest algorithm.
#
# Warning: SHA1 is no longer a cryptographically secure hash, and should not be
# used in security-related components, like password hashing. For passwords, see
# `Crypto::Bcrypt::Password`. For a generic cryptographic hash, use SHA-256 via
# `OpenSSL::Digest.new("SHA256")`.
class Digest::SHA1 < Digest::Base
# This is a direct translation of https://tools.ietf.org/html/rfc3174#section-7
# but we use loop unrolling for faster execution (about 1.07x slower than OpenSSL::SHA1).
def initialize
@intermediate_hash = uninitialized UInt32[5]
@length_low = 0_u32
@length_high = 0_u32
@message_block = StaticArray(UInt8, 64).new(0_u8) # uninitialized UInt8[64]
@message_block_index = 0
@intermediate_hash[0] = 0x67452301_u32
@intermediate_hash[1] = 0xEFCDAB89_u32
@intermediate_hash[2] = 0x98BADCFE_u32
@intermediate_hash[3] = 0x10325476_u32
@intermediate_hash[4] = 0xC3D2E1F0_u32
end
def update(data)
message_array = data.to_slice
message_array.each do |byte|
@message_block[@message_block_index] = byte & 0xFF_u8
@message_block_index += 1
@length_low += 8
if @length_low == 0
@length_high += 1
if @length_high == 0
raise ArgumentError.new "Crypto.sha1: message too long"
end
end
if @message_block_index == 64
process_message_block
end
end
end
def process_message_block
k = {0x5A827999_u32, 0x6ED9EBA1_u32, 0x8F1BBCDC_u32, 0xCA62C1D6_u32}
w = uninitialized UInt32[80]
{% for t in (0...16) %}
w[{{t}}] = @message_block[{{t}} * 4].to_u32 << 24
w[{{t}}] |= @message_block[{{t}} * 4 + 1].to_u32 << 16
w[{{t}}] |= @message_block[{{t}} * 4 + 2].to_u32 << 8
w[{{t}}] |= @message_block[{{t}} * 4 + 3].to_u32
{% end %}
{% for t in (16...80) %}
w[{{t}}] = circular_shift(1, w[{{t - 3}}] ^ w[{{t - 8}}] ^ w[{{t - 14}}] ^ w[{{t - 16}}])
{% end %}
a = @intermediate_hash[0]
b = @intermediate_hash[1]
c = @intermediate_hash[2]
d = @intermediate_hash[3]
e = @intermediate_hash[4]
{% for t in (0...20) %}
temp = circular_shift(5, a) +
((b & c) | ((~b) & d)) + e + w[{{t}}] + k[0]
e = d
d = c
c = circular_shift(30, b)
b = a
a = temp
{% end %}
{% for t in (20...40) %}
temp = circular_shift(5, a) + (b ^ c ^ d) + e + w[{{t}}] + k[1]
e = d
d = c
c = circular_shift(30, b)
b = a
a = temp
{% end %}
{% for t in (40...60) %}
temp = circular_shift(5, a) +
((b & c) | (b & d) | (c & d)) + e + w[{{t}}] + k[2]
e = d
d = c
c = circular_shift(30, b)
b = a
a = temp
{% end %}
{% for t in (60...80) %}
temp = circular_shift(5, a) + (b ^ c ^ d) + e + w[{{t}}] + k[3]
e = d
d = c
c = circular_shift(30, b)
b = a
a = temp
{% end %}
@intermediate_hash[0] += a
@intermediate_hash[1] += b
@intermediate_hash[2] += c
@intermediate_hash[3] += d
@intermediate_hash[4] += e
@message_block_index = 0
end
def circular_shift(bits, word)
(word << bits) | (word >> (32 - bits))
end
def final
end
def result
message_digest = uninitialized UInt8[20]
pad_message
@length_low = 0_u32
@length_high = 0_u32
{% for i in 0...20 %}
message_digest[{{i}}] = (@intermediate_hash[{{i >> 2}}] >> 8 * (3 - ({{i & 0x03}}))).to_u8
{% end %}
message_digest
end
def pad_message
if @message_block_index > 55
@message_block[@message_block_index] = 0x80_u8
@message_block_index += 1
while @message_block_index < 64
@message_block[@message_block_index] = 0_u8
@message_block_index += 1
end
process_message_block
while @message_block_index < 56
@message_block[@message_block_index] = 0_u8
@message_block_index += 1
end
else
@message_block[@message_block_index] = 0x80_u8
@message_block_index += 1
while @message_block_index < 56
@message_block[@message_block_index] = 0_u8
@message_block_index += 1
end
end
@message_block[56] = (@length_high >> 24).to_u8
@message_block[57] = (@length_high >> 16).to_u8
@message_block[58] = (@length_high >> 8).to_u8
@message_block[59] = (@length_high).to_u8
@message_block[60] = (@length_low >> 24).to_u8
@message_block[61] = (@length_low >> 16).to_u8
@message_block[62] = (@length_low >> 8).to_u8
@message_block[63] = (@length_low).to_u8
process_message_block
end
end