(MFC) PBES2 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 PBES2, which ise based on the PBKDF2 function and an underlying block cipher such as RC2, DES, etc.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;

    // Set properties for PBES2 encryption:

    crypt.put_CryptAlgorithm("pbes2");
    crypt.put_PbesPassword("mySecretPassword");

    // Set the underlying PBE algorithm (and key length):
    crypt.put_PbesAlgorithm("rc2");
    crypt.put_KeyLength(128);
    // Only required for the RC2 algorithm:
    crypt.put_Rc2EffectiveKeyLength(128);

    // By definition, the block encryption algorithm (RC2 or whichever
    // was selected) will run in CBC mode.  Therefore, we need
    // an IV.  The IV is equal in length to the block size of the
    // algorithm.  RC2 has a block size of 8 bytes (regardless of
    // key length), so set the IV to some value that is 8 bytes 
    // in length:
    crypt.SetEncodedIV("0000000000000000","hex");

    // Give it some salt:
    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.put_IterationCount(1024);

    // A hash algorithm needs to be set for PBES2:
    crypt.put_HashAlgorithm("sha1");

    // Indicate that the encrypted bytes should be returned
    // as a hex string:
    crypt.put_EncodingMode("hex");

    const char *plainText = "To be encrypted.";

    const char *encryptedText = crypt.encryptStringENC(plainText);

    strOut.append(encryptedText);
    strOut.append("\r\n");

    // Now decrypt:
    const char *decryptedText = crypt.decryptStringENC(encryptedText);

    strOut.append(decryptedText);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }