(Unicode C++) 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.

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#include <CkCrypt2W.h>

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

    CkCrypt2W crypt;

    // Set properties for PBES2 encryption:

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

    // Set the underlying PBE algorithm (and key length):
    crypt.put_PbesAlgorithm(L"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(L"0000000000000000",L"hex");

    // Give it some salt:
    crypt.SetEncodedSalt(L"0102030405060708",L"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(L"sha1");

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

    const wchar_t *plainText = L"To be encrypted.";

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

    wprintf(L"%s\n",encryptedText);

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

    wprintf(L"%s\n",decryptedText);
    }