AES Encrypt a string returning an encrypted string.

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This sample program demonstrates how to encrypt a string using 256-bit AES encryption.

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

// AES Encrypt a string returning an encrypted 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 256-bit AES encryption.
    crypt.put_KeyLength(256);

    // 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 32 bytes (32 bytes * 8 bits/byte = 256 bits)
    // Example:
    // int i;
    // unsigned char sKey[32];
    // for (i=0; i<32; i++) sKey[i] = i;
    // secretKey.append(sKey,32);

    // Tell the component what string-encoding to use for the encrypted output.
    // Encrypted data is binary, and will not be a printable string.  If you want
    // a printable string, it must be encoded using Base64, Hex, Quoted-Printable, etc.
    crypt.put_EncodingMode("base64");

    // Encrypt a string:
    // Note: The AES algorithm pads to a multiple of 16 bytes, so the encrypted
    // (binary) output will be a multiple of 16 bytes.  In this case, the encrypted
    // data is then base64-encoded.  Base64 encoding increases the output length by
    // 4/3rds (4 characters for every 3 bytes encoded).
    CkString strEncrypted;
    crypt.EncryptStringENC("This is a test",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 = [Tt8mImCTz77f7fbbKhEU6A==]
    // strDecrypted = [This is a test]

    }