Data Encryption Standard: Difference between revisions
Added C#
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Line 9:
:to encrypt 8787878787878787
:and display the result 0000000000000000.
=={{header|C#|C sharp}}==
<lang csharp>using System;
using System.IO;
using System.Security.Cryptography;
namespace DES {
class Program {
//Taken from https://stackoverflow.com/a/311179
static string ByteArrayToString(byte[] ba) {
return BitConverter.ToString(ba).Replace("-", "");
}
//Modified from https://stackoverflow.com/q/4100996
//The passwordBytes parameter must be 8 bytes long
static byte[] Encrypt(byte[] messageBytes, byte[] passwordBytes) {
byte[] iv = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateEncryptor(passwordBytes, iv);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and encrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(messageBytes, 0, messageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read the encrypted message from the memory stream
byte[] encryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
return encryptedMessageBytes;
}
//Modified from https://stackoverflow.com/q/4100996
//The passwordBytes parameter must be 8 bytes long
static byte[] Decrypt(byte[] encryptedMessageBytes, byte[] passwordBytes) {
byte[] iv = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateDecryptor(passwordBytes, iv);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and decrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read decrypted message from memory stream
byte[] decryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(decryptedMessageBytes, 0, decryptedMessageBytes.Length);
return decryptedMessageBytes;
}
static void Main(string[] args) {
byte[] keyBytes = new byte[] { 0x0e, 0x32, 0x92, 0x32, 0xea, 0x6d, 0x0d, 0x73 };
byte[] plainBytes = new byte[] { 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87 };
byte[] encStr = Encrypt(plainBytes, keyBytes);
Console.WriteLine("Encoded: {0}", ByteArrayToString(encStr));
byte[] decBytes = Decrypt(encStr, keyBytes);
Console.WriteLine("Decoded: {0}", ByteArrayToString(decBytes));
}
}
}</lang>
{{out}}
<pre>Encoded: 0000000000000000A913F4CB0BD30F97
Decoded: 8787878787878787</pre>
=={{header|Go}}==
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