(C#) PBES1 Password-Based Encryption (PBE)

Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES1, which ise based on the PBKDF1 function and an underlying block cipher such as RC2, DES, etc.

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// Set properties for PBES1 encryption:

crypt.CryptAlgorithm = "pbes1";
crypt.PbesPassword = "mySecretPassword";

// Set the underlying PBE algorithm (and key length):
// For PBES1, the underlying algorithm must be either
// 56-bit DES or 64-bit RC2 
// (this is according to the PKCS#5 specifications at
// http://www.rsa.com/rsalabs/node.asp?id=2127   )
crypt.PbesAlgorithm = "rc2";
crypt.KeyLength = 64;

// The salt for PBKDF1 is always 8 bytes:
crypt.SetEncodedSalt("0102030405060708","hex");

// A higher iteration count makes the algorithm more
// computationally expensive and therefore exhaustive
// searches (for breaking the encryption) is more difficult:
crypt.IterationCount = 1024;

// A hash algorithm needs to be set for PBES1:
crypt.HashAlgorithm = "sha1";

// Indicate that the encrypted bytes should be returned
// as a hex string:
crypt.EncodingMode = "hex";

string plainText = "To be encrypted.";

string encryptedText = crypt.EncryptStringENC(plainText);

Debug.WriteLine(encryptedText);

// Now decrypt:
string decryptedText = crypt.DecryptStringENC(encryptedText);

Debug.WriteLine(decryptedText);