using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
class HelloWorld {
public static void Main() {
//Console.WriteLine("Enter text that needs to be encrypted..");
//string data = Console.ReadLine();
DecryptAesManaged("pswWQw47uioeRGxVValA+rNUV/fKiEE3MTb3izp6U3H1V98nwgekyrBSHDMoq2AGWnn54F8bWHfMfT+WeNNN0Q==");
//Console.ReadLine();
}
static void DecryptAesManaged(string raw) {
try {
// Create Aes that generates a new key and initialization vector (IV).
// Same key must be used in encryption and decryption
using(AesManaged aes = new AesManaged()) {
// Encrypt string
string encrypted = Decryption(raw, "bfil-hrr-admin20");
// Print encrypted string
Console.WriteLine( $"Encrypted data: {encrypted}");
// Decrypt the bytes to a string.
}
} catch (Exception exp) {
Console.WriteLine(exp.Message);
}
Console.ReadKey();
}
static string Encryption(string plaintext, string secretKey)
{
string res = "";
try
{
byte[] src = Encoding.UTF8.GetBytes(plaintext);
using (var aes = new AesCryptoServiceProvider())
{
aes.BlockSize = 128;
aes.KeySize = 128;
byte[] IV = new byte[aes.BlockSize / 8];
aes.IV = IV;
aes.Key = Encoding.UTF8.GetBytes(secretKey);
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.Zeros;
// decryption
using (ICryptoTransform encrypt = aes.CreateEncryptor(aes.Key, aes.IV))
{
byte[] encryptedText = encrypt.TransformFinalBlock(src, 0, src.Length);
res = Convert.ToBase64String(encryptedText, 0, encryptedText.Length);
aes.Clear();
}
}
}
catch (Exception ex)
{
res = ex.ToString();
}
return res;
}
static string Decryption(string encryptedText, string secretKey)
{
string res = "";
try
{
byte[] src = Convert.FromBase64String(encryptedText); ;
using (var aes = new AesCryptoServiceProvider())
{
aes.BlockSize = 128;
aes.KeySize = 128;
byte[] IV = new byte[aes.BlockSize / 8];
aes.IV = IV;
aes.Key = Encoding.UTF8.GetBytes(secretKey);
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.Zeros;
// decryption
using (ICryptoTransform decrypt = aes.CreateDecryptor(aes.Key, aes.IV))
{
byte[] decryptedText = decrypt.TransformFinalBlock(src, 0, src.Length);
res = Encoding.UTF8.GetString(decryptedText).Trim();
}
}
}
catch (Exception ex)
{
res = ex.ToString();
}
return res;
}
} Write, Run & Share C# code online using OneCompiler's C# online compiler for free. It's one of the robust, feature-rich online compilers for C# language, running on the latest version 8.0. Getting started with the OneCompiler's C# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C# and start coding.
OneCompiler's C# online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.
using System;
namespace Sample
{
class Test
{
public static void Main(string[] args)
{
string name;
name = Console.ReadLine();
Console.WriteLine("Hello {0} ", name);
}
}
}
C# is a general purpose object-oriented programming language by Microsoft. Though initially it was developed as part of .net but later it was approved by ECMA and ISO standards.
You can use C# to create variety of applications, like web, windows, mobile, console applications and much more using Visual studio.
| Data Type | Description | Range | size |
|---|---|---|---|
| int | To store integers | -2,147,483,648 to 2,147,483,647 | 4 bytes |
| double | to store large floating point numbers with decimals | can store 15 decimal digits | 8 bytes |
| float | to store floating point numbers with decimals | can store upto 7 decimal digits | 4 bytes |
| char | to store single characters | - | 2 bytes |
| string | to stores text | - | 2 bytes per character |
| bool | to stores either true or false | - | 1 bit |
datatype variable-name = value;
When ever you want to perform a set of operations based on a condition or set of few conditions IF-ELSE is used.
if(conditional-expression) {
// code
}
else {
// code
}
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement) {
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type[] array-name;
Method is a set of statements which gets executed only when they are called. Call the method name in the main function to execute the method.
static void method-name()
{
// code to be executed
}