encryption decryption

Encryption

Sometimes we want to encrypt the values that time we use MD5 Encryption and Decryption
Here i give the code for Encryption and Decryption.

passPhrase ,saltValue ,initVector this variables are the key for Encryption and Decryption

public static string passPhrase = "YOUR KEY1";

public static string saltValue = "YOUR KE2";

public static string initVector = "YOUR KE3";

public static string FunForEncrypt(string objText)

{

int keySize = 256;

int passwordIterations = 03;

string hashAlgorithm = "MD5";

byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);

byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);

byte[] plainTextBytes = Encoding.UTF8.GetBytes(objText);

PasswordDeriveBytes password = new PasswordDeriveBytes

(

passPhrase,

saltValueBytes,

hashAlgorithm,

passwordIterations

);

byte[] keyBytes = password.GetBytes(keySize / 8);

RijndaelManaged symmetricKey = new RijndaelManaged();

symmetricKey.Mode = CipherMode.CBC;

ICryptoTransform encryptor = symmetricKey.CreateEncryptor

(

keyBytes,

initVectorBytes

);

MemoryStream memoryStream = new MemoryStream();

CryptoStream cryptoStream = new CryptoStream

(

memoryStream,

encryptor,

CryptoStreamMode.Write

);

cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);

cryptoStream.FlushFinalBlock();

byte[] cipherTextBytes = memoryStream.ToArray();

memoryStream.Close();

cryptoStream.Close();

string cipherText = Convert.ToBase64String(cipherTextBytes);

cipherText = HttpUtility.UrlEncode(cipherText);

return cipherText;

}

Decryption :

this below code used to Decrypt the text

public static string FunForDecrypt(string cipherText)

{

string plainText = "";

int keySize = 256;

int passwordIterations = 03;

string hashAlgorithm = "MD5";

try

{

cipherText = HttpUtility.UrlDecode(cipherText);

byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);

byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);

byte[] cipherTextBytes = Convert.FromBase64String(cipherText);

PasswordDeriveBytes password = new PasswordDeriveBytes

(

passPhrase,

saltValueBytes,

hashAlgorithm,

passwordIterations

);

byte[] keyBytes = password.GetBytes(keySize / 8);

RijndaelManaged symmetricKey = new RijndaelManaged();

symmetricKey.Mode = CipherMode.CBC;

ICryptoTransform decryptor = symmetricKey.CreateDecryptor

(

keyBytes,

initVectorBytes

);

MemoryStream memoryStream = new MemoryStream(cipherTextBytes);

CryptoStream cryptoStream = new CryptoStream

(

memoryStream,

decryptor,

CryptoStreamMode.Read

);

byte[] plainTextBytes = new byte[cipherTextBytes.Length];

int decryptedByteCount = cryptoStream.Read

(

plainTextBytes,

plainTextBytes.Length

);

memoryStream.Close();

cryptoStream.Close();

plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);

}

catch (Exception ex)

{

plainText = "";

}

return plainText;

}

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Bikesh Srivastava10y ago
I think same question is posting again again ...
0
Ananth G10y ago
Encryption
Sometimes we want to encrypt the values that time we use MD5 Encryption and Decryption
Here i give the code for Encryption and Decryption.
passPhrase ,saltValue ,initVector this variables are the key for Encryption and Decryption
public static string passPhrase = "YOUR KEY1";
public static string saltValue = "YOUR KE2";
public static string initVector = "YOUR KE3";

public static string FunForEncrypt(string objText)
{
int keySize = 256;
int passwordIterations = 03;
string hashAlgorithm = "MD5";
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
byte[] plainTextBytes = Encoding.UTF8.GetBytes(objText);
PasswordDeriveBytes password = new PasswordDeriveBytes
(
passPhrase,
saltValueBytes,
hashAlgorithm,
passwordIterations
);
byte[] keyBytes = password.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform encryptor = symmetricKey.CreateEncryptor
(
keyBytes,
initVectorBytes
);
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream
(
memoryStream,
encryptor,
CryptoStreamMode.Write
);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
memoryStream.Close();
cryptoStream.Close();
string cipherText = Convert.ToBase64String(cipherTextBytes);
cipherText = HttpUtility.UrlEncode(cipherText);
return cipherText;
}

Decryption :
this below code used to Decrypt the text
public static string FunForDecrypt(string cipherText)
{
string plainText = "";
int keySize = 256;
int passwordIterations = 03;
string hashAlgorithm = "MD5";
try
{
cipherText = HttpUtility.UrlDecode(cipherText);
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
PasswordDeriveBytes password = new PasswordDeriveBytes
(
passPhrase,
saltValueBytes,
hashAlgorithm,
passwordIterations
);
byte[] keyBytes = password.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform decryptor = symmetricKey.CreateDecryptor
(
keyBytes,
initVectorBytes
);
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
CryptoStream cryptoStream = new CryptoStream
(
memoryStream,
decryptor,
CryptoStreamMode.Read
);
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read
(
plainTextBytes,
0,
plainTextBytes.Length
);
memoryStream.Close();
cryptoStream.Close();
plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
catch (Exception ex)
{
plainText = "";
}
return plainText;
}
0
Nanhe Siddique11y ago
read this link

http://forums.asp.net/t/1390152.aspx?How+to+solve+System+Security+Cryptography+CryptographicException+Bad+Data+error

http://stackoverflow.com/questions/6555887/occasional-bad-data-error-while-decrypting-the-string-system-security-cryptogr

http://forums.asp.net/t/1390152.aspx?How+to+solve+System+Security+Cryptography+CryptographicException+Bad+Data+error

it may help you
0
Upendra Pratap Shahi11y ago
Kindly give database script for this...

read below article it may help you..
http://stackoverflow.com/questions/19675103/cryptographicexception-was-unhandled-by-user-code

http://www.codeproject.com/Questions/484567/CryptographicplusexceptionplusplusWasplusunhandled
0