-
Notifications
You must be signed in to change notification settings - Fork 1
/
StringExtensions.cs
249 lines (231 loc) · 8.34 KB
/
StringExtensions.cs
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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace ReeCode
{
public static class StringExtensions
{
/// <summary>
/// Checks if a string is a Palindrome
/// </summary>
/// <param name="inputString"></param>
/// <returns>True / False</returns>
public static bool IsAPalindrome(this string inputString)
{
if (inputString == inputString.Reverse())
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// Checks if a string is a Pangram
/// </summary>
/// <param name="inputString"></param>
/// <returns>True / False</returns>
public static bool IsAPangram(this string inputString)
{
inputString = inputString.ToLower();
for (char c = 'a'; c <= 'z'; c++)
{
if (!inputString.Contains(c.ToString()))
{
return false;
}
}
return true;
}
/// <summary>
/// Reverses a string
/// </summary>
/// <param name="inputString"></param>
/// <returns>The reversed string</returns>
public static string Reverse(this string inputString)
{
char[] charArray = inputString.ToCharArray();
Array.Reverse(charArray);
string reversedString = new string(charArray);
return reversedString;
}
/// <summary>
/// Converts a string to a list of characters
/// </summary>
/// <param name="inputString"></param>
/// <returns>A list containing each character in the string</returns>
public static List<char> ToCharList(this string inputString)
{
List<char> charList = inputString.Select(x => x).ToList();
return charList;
}
/// <summary>
/// Removes all text from the start of the string until the search value
/// </summary>
/// <param name="tillEnd">Remove until the end of the search string</param>
/// <returns></returns>
public static string RemoveUntil(this string inputString, string searchString, bool tillEnd)
{
inputString = inputString.Remove(0, inputString.IndexOf(searchString));
if (tillEnd)
{
inputString = inputString.Remove(0, searchString.Length);
}
return inputString;
}
/// <summary>
/// Converts a string to Base64
/// </summary>
public static string ToBase64(this string inputString)
{
var plainTextBytes = Encoding.UTF8.GetBytes(inputString);
return Convert.ToBase64String(plainTextBytes);
}
/// <summary>
/// Converts a Base64 encoded string to plain text
/// </summary>
public static string FromBase64(this string inputString)
{
var base64EncodedBytes = Convert.FromBase64String(inputString);
return Encoding.UTF8.GetString(base64EncodedBytes);
}
/// <summary>
/// Encodes a string with the MD5 hash function
/// </summary>
public static string ToMD5(this string input)
{
using (var cryptoProvider = new MD5CryptoServiceProvider())
{
var hash = cryptoProvider.ComputeHash(Encoding.UTF8.GetBytes(input));
cryptoProvider.Dispose();
return string.Join("", hash.Select(b => b.ToString("x2")).ToArray());
}
}
/// <summary>
/// Encodes a string with the ROT13 Cipher
/// </summary>
// Taken from https://www.dotnetperls.com/rot13
public static string ToROT13(this string input)
{
char[] array = input.ToCharArray();
for (int i = 0; i < array.Length; i++)
{
int number = array[i];
if (number >= 'a' && number <= 'z')
{
if (number > 'm')
{
number -= 13;
}
else
{
number += 13;
}
}
else if (number >= 'A' && number <= 'Z')
{
if (number > 'M')
{
number -= 13;
}
else
{
number += 13;
}
}
array[i] = (char)number;
}
return new string(array);
}
/// <summary>
/// Encodes a string with the SHA-1 hash function
/// </summary>
public static string ToSHA1(this string input)
{
using (var cryptoProvider = new SHA1Managed())
{
var hash = cryptoProvider.ComputeHash(Encoding.UTF8.GetBytes(input));
cryptoProvider.Dispose();
return string.Join("", hash.Select(b => b.ToString("x2")).ToArray());
}
}
/// <summary>
/// Encodes a string with the SHA-512 hash function
/// </summary>
public static string ToSHA512(this string input)
{
using (var cryptoProvider = new SHA512Managed())
{
var hash = cryptoProvider.ComputeHash(Encoding.UTF8.GetBytes(input));
cryptoProvider.Dispose();
return string.Join("", hash.Select(b => b.ToString("x2")).ToArray());
}
}
/// <summary>
/// Decrypts a string encoded with the Vigenère cipher
/// </summary>
/// <param name="key">The decryption key</param>
// Taken From: https://www.programmingalgorithms.com/algorithm/vigenere-cipher
public static string VigenereDecrypt(this string inputString, string key)
{
for (int i = 0; i < key.Length; ++i)
{
if (!char.IsLetter(key[i]))
{
return null; // Error
}
}
string output = string.Empty;
int nonAlphaCharCount = 0;
for (int i = 0; i < inputString.Length; ++i)
{
if (char.IsLetter(inputString[i]))
{
bool cIsUpper = char.IsUpper(inputString[i]);
char offset = cIsUpper ? 'A' : 'a';
int keyIndex = (i - nonAlphaCharCount) % key.Length;
int k = (cIsUpper ? char.ToUpper(key[keyIndex]) : char.ToLower(key[keyIndex])) - offset;
k = -k;
int a = ((inputString[i] + k) - offset);
int b = 26;
int m = (a % b + b) % b; // Note that C#'s % operator is actually NOT modulo, it's remainder (:|)
char ch = (char)((m) + offset);
output += ch;
}
else
{
output += inputString[i];
++nonAlphaCharCount;
}
}
return output;
}
/// <summary>
/// Converts a string to a Char Array
/// </summary>
/// <param name="inputString"></param>
/// <returns></returns>
public static char[] ToCharArray(this string inputString)
{
char[] chars = new char[inputString.Length];
for (int j = 0; j < inputString.Length; j++)
{
chars[j] = inputString[j];
}
return chars;
}
/// <summary>
/// Converts a string to a Byte Array
/// </summary>
/// <param name="inputString"></param>
/// <returns></returns>
public static byte[] ToByteArray(this string inputString)
{
byte[] byteArray = Encoding.ASCII.GetBytes(inputString);
return byteArray;
}
}
}