forked from TheAlgorithms/Go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
polybius_test.go
190 lines (181 loc) · 5 KB
/
polybius_test.go
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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
package polybius
import (
"fmt"
"log"
"strings"
"testing"
)
func ExampleNewPolybius() {
// initialize
const (
plainText = "HogeFugaPiyoSpam"
size = 5
characters = "HogeF"
key = "abcdefghijklmnopqrstuvwxy"
)
p, err := NewPolybius(key, size, characters)
if err != nil {
log.Fatalf("failed NewPolybius: %v", err)
}
encryptedText, err := p.Encrypt(plainText)
if err != nil {
log.Fatalf("failed Encrypt: %v", err)
}
fmt.Printf("Encrypt=> plainText: %s, encryptedText: %s\n", plainText, encryptedText)
decryptedText, err := p.Decrypt(encryptedText)
if err != nil {
log.Fatalf("failed Decrypt: %v", err)
}
fmt.Printf("Decrypt=> encryptedText: %s, decryptedText: %s\n", encryptedText, decryptedText)
// Output:
// Encrypt=> plainText: HogeFugaPiyoSpam, encryptedText: OGGFOOHFOHFHOOHHEHOEFFGFEEEHHHGG
// Decrypt=> encryptedText: OGGFOOHFOHFHOOHHEHOEFFGFEEEHHHGG, decryptedText: HOGEFUGAPIYOSPAM
}
func TestNewPolybius(t *testing.T) {
t.Parallel()
cases := []struct {
name string
size int
characters string
key string
wantErr string
}{
{
name: "correct initialization", size: 5, characters: "HogeF", key: "abcdefghijklmnopqrstuvwxy", wantErr: "",
},
{
name: "truncate characters", size: 5, characters: "HogeFuga", key: "abcdefghijklmnopqrstuvwxy", wantErr: "",
},
{
name: "invalid key", size: 5, characters: "HogeFuga", key: "abcdefghi", wantErr: "len(key): 9 must be as long as size squared: 25",
},
{
name: "invalid characters", size: 5, characters: "HogeH", key: "abcdefghijklmnopqrstuvwxy", wantErr: "\"OGEH\" contains same character 'H'",
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
_, err := NewPolybius(tc.key, tc.size, tc.characters)
if err != nil && err.Error() != tc.wantErr {
t.Errorf("failed NewPolybius: %v", err)
}
})
}
}
func TestPolybiusEncrypt(t *testing.T) {
t.Parallel()
cases := []struct {
name string
text string
want string
}{
{
name: "correct encryption", text: "HogeFugaPiyoSpam", want: "OGGFOOHFOHFHOOHHEHOEFFGFEEEHHHGG",
},
{
name: "invalid encryption", text: "hogz", want: "failed encipher: 'Z' does not exist in keys",
},
}
// initialize
const (
size = 5
characters = "HogeF"
key = "abcdefghijklmnopqrstuvwxy"
)
p, err := NewPolybius(key, size, characters)
if err != nil {
t.Fatalf("failed NewPolybius: %v", err)
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
encrypted, err := p.Encrypt(tc.text)
if err != nil {
if err.Error() != tc.want {
t.Errorf("failed Encrypt: %v", err)
}
} else if encrypted != tc.want {
t.Errorf("Encrypt: %v, want: %v", encrypted, tc.want)
}
})
}
}
func TestPolybiusDecrypt(t *testing.T) {
t.Parallel()
cases := []struct {
name string
text string
want string
}{
{
name: "correct decryption", text: "OGGFOOHFOHFHOOHHEHOEFFGFEEEHHHGG", want: "HOGEFUGAPIYOSPAM",
},
{
name: "invalid decryption(position of even number)", text: "hogz", want: "failed decipher: Z does not exist in characters",
},
{
name: "invalid decryption(position of odd number)", text: "hode", want: "failed decipher: D does not exist in characters",
},
{
name: "invalid text size which is odd", text: "hog", want: "failed decipher: the size of \"chars\" must be even",
},
}
// initialize
const (
size = 5
characters = "HogeF"
key = "abcdefghijklmnopqrstuvwxy"
)
p, err := NewPolybius(key, size, characters)
if err != nil {
t.Fatalf("failed NewPolybius: %v", err)
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
encrypted, err := p.Decrypt(tc.text)
if err != nil {
if err.Error() != tc.want {
t.Errorf("failed Encrypt: %v", err)
}
} else if encrypted != tc.want {
t.Errorf("Encrypt: %v, want: %v", encrypted, tc.want)
}
})
}
}
func FuzzPolybius(f *testing.F) {
const (
size = 5
characters = "HogeF"
key = "abcdefghijklmnopqrstuvwxy"
)
f.Add(size, characters, key)
f.Fuzz(func(t *testing.T, size int, characters, key string) {
p, err := NewPolybius(key, size, characters)
switch {
case err == nil:
case strings.Contains(err.Error(), "cannot be negative"),
strings.Contains(err.Error(), "is too small"),
strings.Contains(err.Error(), "should only contain latin characters"),
strings.Contains(err.Error(), "contains same character"),
strings.Contains(err.Error(), "must be as long as size squared"):
return
default:
t.Fatalf("unexpected error when creating a new polybius variable: %v", err)
}
encrypted, err := p.Encrypt(characters)
switch {
case err == nil:
case strings.Contains(err.Error(), "does not exist in keys"):
return
default:
t.Fatalf("unexpected error during encryption: %v", err)
}
decrypted, err := p.Decrypt(encrypted)
if err != nil {
t.Fatalf("unexpected error during decryption: %v", err)
}
if decrypted != strings.ToUpper(characters) {
t.Errorf("Expecting output to match with %q but was %q", characters, decrypted)
}
})
}