C# Class RijndaelEncryptDecrypt.Rijndael

This class uses a symmetric key algorithm (Rijndael/AES) to encrypt and decrypt data. As long as encryption and decryption routines use the same parameters to generate the keys, the keys are guaranteed to be the same. The class uses static functions with duplicate code to make it easier to demonstrate encryption and decryption logic. In a real-life application, this may not be the most efficient way of handling encryption, so - as soon as you feel comfortable with it - you may want to redesign this class.

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Public Methods

Method	Description
Decrypt ( string cipherText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize ) : string	Decrypts specified ciphertext using Rijndael symmetric key algorithm. Most of the logic in this function is similar to the Encrypt logic. In order for decryption to work, all parameters of this function - except cipherText value - must match the corresponding parameters of the Encrypt function which was called to generate the ciphertext.
Encrypt ( string plainText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize ) : string	Encrypts specified plaintext using Rijndael symmetric key algorithm and returns a base64-encoded result.

Method Details

Decrypt() public static method

Decrypts specified ciphertext using Rijndael symmetric key algorithm.

Most of the logic in this function is similar to the Encrypt logic. In order for decryption to work, all parameters of this function - except cipherText value - must match the corresponding parameters of the Encrypt function which was called to generate the ciphertext.

public static Decrypt ( string cipherText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize ) : string
cipherText	string	/// Base64-formatted ciphertext value. ///
passPhrase	string	/// Passphrase from which a pseudo-random password will be derived. The /// derived password will be used to generate the encryption key. /// Passphrase can be any string. In this example we assume that this /// passphrase is an ASCII string. ///
saltValue	string	/// Salt value used along with passphrase to generate password. Salt can /// be any string. In this example we assume that salt is an ASCII string. ///
hashAlgorithm	string	/// Hash algorithm used to generate password. Allowed values are: "MD5" and /// "SHA1". SHA1 hashes are a bit slower, but more secure than MD5 hashes. ///
passwordIterations	int	/// Number of iterations used to generate password. One or two iterations /// should be enough. ///
initVector	string	/// Initialization vector (or IV). This value is required to encrypt the /// first block of plaintext data. For RijndaelManaged class IV must be /// exactly 16 ASCII characters long. ///
keySize	int	/// Size of encryption key in bits. Allowed values are: 128, 192, and 256. /// Longer keys are more secure than shorter keys. ///
return	string

Encrypt() public static method

Encrypts specified plaintext using Rijndael symmetric key algorithm and returns a base64-encoded result.

public static Encrypt ( string plainText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize ) : string
plainText	string	/// Plaintext value to be encrypted. ///
passPhrase	string	/// Passphrase from which a pseudo-random password will be derived. The /// derived password will be used to generate the encryption key. /// Passphrase can be any string. In this example we assume that this /// passphrase is an ASCII string. ///
saltValue	string	/// Salt value used along with passphrase to generate password. Salt can /// be any string. In this example we assume that salt is an ASCII string. ///
hashAlgorithm	string	/// Hash algorithm used to generate password. Allowed values are: "MD5" and /// "SHA1". SHA1 hashes are a bit slower, but more secure than MD5 hashes. ///
passwordIterations	int	/// Number of iterations used to generate password. One or two iterations /// should be enough. ///
initVector	string	/// Initialization vector (or IV). This value is required to encrypt the /// first block of plaintext data. For RijndaelManaged class IV must be /// exactly 16 ASCII characters long. ///
keySize	int	/// Size of encryption key in bits. Allowed values are: 128, 192, and 256. /// Longer keys are more secure than shorter keys. ///
return	string