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MD5Crypt.cs
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MD5Crypt.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Tool_SqlInjectionBlind_Dvwa
{
class MD5Crypt
{
/// <summary>
/// Encrypts a string using a specified security key with
/// the option to hash.
/// </summary>
/// <param name="toEncrypt">String to encrypt</param>
/// <param name="securityKey">The key to apply to the encryption</param>
/// <param name="useHashing">Weather hashing is used</param>
/// <returns>The encrpyted string</returns>
public static string Encrypt(string toEncrypt, string securityKey,
bool useHashing)
{
string retVal = string.Empty;
try
{
byte[] keyArray;
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
// Validate inputs
ValidateInput(toEncrypt);
ValidateInput(securityKey);
// If hashing use get hashcode regards to your key
if (useHashing)
{
MD5CryptoServiceProvider hashmd5 = new
MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8
.GetBytes(securityKey));
// Always release the resources and flush data
// of the Cryptographic service provide. Best Practice
hashmd5.Clear();
}
else
{
keyArray = UTF8Encoding.UTF8.GetBytes(securityKey);
}
TripleDESCryptoServiceProvider tdes = new
TripleDESCryptoServiceProvider();
// Set the secret key for the tripleDES algorithm
tdes.Key = keyArray;
// Mode of operation. there are other 4 modes.
// We choose ECB (Electronic code Book)
tdes.Mode = CipherMode.ECB;
// Padding mode (if any extra byte added)
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateEncryptor();
// Transform the specified region of bytes array to resultArray
byte[] resultArray =
cTransform.TransformFinalBlock(toEncryptArray, 0,
toEncryptArray.Length);
// Release resources held by TripleDes Encryptor
tdes.Clear();
// Return the encrypted data into unreadable string format
retVal = Convert.ToBase64String(resultArray, 0,
resultArray.Length);
}
catch (Exception ex)
{
// throw new EncryptionException(.
//Code.EncryptionFailure, ex, MethodBase.GetCurrentEncryptionExceptionMethod());
}
return retVal;
}
/// <summary>
/// Decrypts a specified key against the original security
/// key, with the option to hash.
/// </summary>
/// <param name="cipherString">String to decrypt</param>
/// <param name="securityKey">The original security key</param>
/// <param name="useHashing">Weather hashing is enabled</param>
/// <returns>The decrypted key</returns>
public static string Decrypt(string cipherString, string securityKey,
bool useHashing)
{
string retVal = string.Empty;
try
{
byte[] keyArray;
byte[] toEncryptArray = Convert.FromBase64String(cipherString);
// Validate inputs
ValidateInput(cipherString);
ValidateInput(securityKey);
if (useHashing)
{
// If hashing was used get the hash code with regards to your key
MD5CryptoServiceProvider hashmd5 = new
MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.
GetBytes(securityKey));
// Release any resource held by the MD5CryptoServiceProvider
hashmd5.Clear();
}
else
{
// If hashing was not implemented get the byte code of the key
keyArray = UTF8Encoding.UTF8.GetBytes(securityKey);
}
TripleDESCryptoServiceProvider tdes = new
TripleDESCryptoServiceProvider();
// Set the secret key for the tripleDES algorithm
tdes.Key = keyArray;
// Mode of operation. there are other 4 modes.
// We choose ECB(Electronic code Book)
tdes.Mode = CipherMode.ECB;
// Padding mode(if any extra byte added)
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateDecryptor();
byte[] resultArray = cTransform.TransformFinalBlock(
toEncryptArray, 0, toEncryptArray.Length);
// Release resources held by TripleDes Encryptor
tdes.Clear();
// Return the Clear decrypted TEXT
retVal = UTF8Encoding.UTF8.GetString(resultArray);
}
catch (Exception ex)
{
// throw new EncryptionException(EncryptionException.Code.
//DecryptionFailure, ex, MethodBase.GetCurrentMethod());
}
return retVal;
}
/// <summary>
/// Validates an input value
/// </summary>
/// <param name="inputValue">Specified input value</param>
/// <returns>True | Falue - Value is valid</returns>
private static bool ValidateInput(string inputValue)
{
bool valid = string.IsNullOrEmpty(inputValue);
if (!valid)
{
// throw new EncryptionException(EncryptionException.Code.
//InvalidInputValues, MethodBase.GetCurrentMethod());
}
return valid;
}
}
}