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using System;
using System;
using System.Security.Cryptography;
using System.Security.Cryptography;
using System.Text;
using System.Text;


class SSN
class SSN
{
{
public string EncryptString(string plainString, string keyString, string encryptionIV)
public string EncryptString(string plainString, string keyString, string encryptionIV)
{
{
byte[] key = Encoding.UTF8.GetBytes(keyString);
byte[] key = Encoding.UTF8.GetBytes(keyString.Substring(0, 16));
byte[] iv = Encoding.UTF8.GetBytes(encryptionIV);
byte[] iv = Encoding.UTF8.GetBytes(encryptionIV.Substring(0, 16));


using (Aes aesAlg = Aes.Create())
using (Aes aesAlg = Aes.Create())
{
{
aesAlg.KeySize = 128;
aesAlg.Key = key;
aesAlg.Key = key;
aesAlg.IV = iv;
aesAlg.IV = iv;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Padding = PaddingMode.None;
aesAlg.Padding = PaddingMode.None;


ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);


byte[] plainBytes = Encoding.UTF8.GetBytes(plainString);
byte[] plainBytes = Encoding.UTF8.GetBytes(plainString);


int blockSize = 16;
int blockSize = 16;
int paddingNeeded = blockSize - (plainBytes.Length % blockSize);
int paddingNeeded = blockSize - (plainBytes.Length % blockSize);


byte[] paddedBytes = new byte[plainBytes.Length + paddingNeeded];
byte[] paddedBytes = new byte[plainBytes.Length + paddingNeeded];
Array.Copy(plainBytes, paddedBytes, plainBytes.Length);
Array.Copy(plainBytes, paddedBytes, plainBytes.Length);
for (int i = plainBytes.Length; i < paddedBytes.Length; i++)
for (int i = plainBytes.Length; i < paddedBytes.Length; i++)
{
{
paddedBytes[i] = (byte)paddingNeeded;
paddedBytes[i] = (byte)paddingNeeded;
}
}


byte[] encryptedBytes = encryptor.TransformFinalBlock(paddedBytes, 0, paddedBytes.Length);
byte[] encryptedBytes = encryptor.TransformFinalBlock(paddedBytes, 0, paddedBytes.Length);


return Convert.ToBase64String(encryptedBytes);
return Convert.ToBase64String(encryptedBytes);
}
}
}
}


public string DecryptString(string encryptedString, string keyString, string encryptionIV)
public string DecryptString(string encryptedString, string keyString, string encryptionIV)
{
{
byte[] key = Encoding.UTF8.GetBytes(keyString);
byte[] key = Encoding.UTF8.GetBytes(keyString.Substring(0, 16));
byte[] iv = Encoding.UTF8.GetBytes(encryptionIV);
byte[] iv = Encoding.UTF8.GetBytes(encryptionIV.Substring(0, 16));


using (Aes aesAlg = Aes.Create())
using (Aes aesAlg = Aes.Create())
{
{
aesAlg.KeySize = 128;
aesAlg.Key = key;
aesAlg.Key = key;
aesAlg.IV = iv;
aesAlg.IV = iv;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Padding = PaddingMode.None;
aesAlg.Padding = PaddingMode.None;


ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);


byte[] encryptedBytes = Convert.FromBase64String(encryptedString);
byte[] encryptedBytes = Convert.FromBase64String(encryptedString);
byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);


int paddingByte = decryptedBytes[decryptedBytes.Length - 1];
int paddingByte = decryptedBytes[decryptedBytes.Length - 1];
int unpaddedLength = decryptedBytes.Length - paddingByte;
int unpaddedLength = decryptedBytes.Length - paddingByte;


return Encoding.UTF8.GetString(decryptedBytes, 0, unpaddedLength);
return Encoding.UTF8.GetString(decryptedBytes, 0, unpaddedLength);
}
}
}
}
}
}

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