(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 <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *plainText;
    const char *encryptedText;
    const char *decryptedText;

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

    crypt = CkCrypt2_Create();

    // Set properties for PBES2 encryption:

    CkCrypt2_putCryptAlgorithm(crypt,"pbes2");
    CkCrypt2_putPbesPassword(crypt,"mySecretPassword");

    // Set the underlying PBE algorithm (and key length):
    CkCrypt2_putPbesAlgorithm(crypt,"rc2");
    CkCrypt2_putKeyLength(crypt,128);
    // Only required for the RC2 algorithm:
    CkCrypt2_putRc2EffectiveKeyLength(crypt,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:
    CkCrypt2_SetEncodedIV(crypt,"0000000000000000","hex");

    // Give it some salt:
    CkCrypt2_SetEncodedSalt(crypt,"0102030405060708","hex");

    // A higher iteration count makes the algorithm more
    // computationally expensive and therefore exhaustive
    // searches (for breaking the encryption) is more difficult:
    CkCrypt2_putIterationCount(crypt,1024);

    // A hash algorithm needs to be set for PBES2:
    CkCrypt2_putHashAlgorithm(crypt,"sha1");

    // Indicate that the encrypted bytes should be returned
    // as a hex string:
    CkCrypt2_putEncodingMode(crypt,"hex");

    plainText = "To be encrypted.";

    encryptedText = CkCrypt2_encryptStringENC(crypt,plainText);

    printf("%s\n",encryptedText);

    // Now decrypt:
    decryptedText = CkCrypt2_decryptStringENC(crypt,encryptedText);

    printf("%s\n",decryptedText);


    CkCrypt2_Dispose(crypt);

    }