AES Encrypt / URL Encode String

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This sample program demonstrates AES encrypt a string, creating a url-encoded encrypted string.

// The Chilkat Encryption library is also available as an ActiveX component
// or .NET class with the identical set of methods and properties.

// Encrypt and URL-encode a string.
void CryptExample(void)
    {
    CkCrypt2 crypt;
    
    // Any string passed to UnlockComponent automatically begins the 30-day trial.
    crypt.UnlockComponent("30-day trial");

    // Use AES encryption.
    crypt.put_CryptAlgorithm("aes");
    
    // Use 128-bit AES encryption.
    // It is also possible to use 192-bit or 256-bit AES encryption.
    crypt.put_KeyLength(128);

    // Create a binary secret key from a password string.
    CkByteData secretKey;
    crypt.GenerateSecretKey("myPassword",secretKey);
    crypt.put_SecretKey(secretKey);

    // Note: we could just as well set the binary secret key directly.
    // We need a binary key of 16 bytes (16 bytes * 8 bits/byte = 128 bits)
    // Example:
    // int i;
    // unsigned char sKey[16];
    // for (i=0; i<16; i++) sKey[i] = i;
    // secretKey.append(sKey,16);

    // Set the output string encoding to "URL"
    crypt.put_EncodingMode("url");

    // Encrypt a string.
    // NOTE: AES encryption pads to a multiple of 16 bytes.
    CkString strEncrypted;
    crypt.EncryptStringENC("ABCD1234",strEncrypted);
    printf("strEncrypted = [%s]\n",strEncrypted.getString());

    // Now decrypt it:
    CkString strDecrypted;
    crypt.DecryptStringENC(strEncrypted.getString(),strDecrypted);
    printf("strDecrypted = [%s]\n",strDecrypted.getString());

    // PRINTS:
    // strEncrypted = [%0D%C2%D7Am%F1d%08e%B3%00%8Fu%AB%DE%FF]
    // strDecrypted = [ABCD1234]