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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use chilkat();

$crypt = new chilkat::CkCrypt2();

$success = $crypt->UnlockComponent("Anything for 30-day trial");
if ($success != 1) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

#  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");

$plainText = "To be encrypted.";

$encryptedText = $crypt->encryptStringENC($plainText);

print $encryptedText . "\r\n";

#  Now decrypt:
$decryptedText = $crypt->decryptStringENC($encryptedText);

print $decryptedText . "\r\n";