(MFC) ARC4 Encryption (ARCFOUR)

ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;

    // Set the encryption algorithm = "arc4"	
    crypt.put_CryptAlgorithm("arc4");

    // KeyLength may range from 1 byte to 256 bytes.
    // (i.e. 8 bits to 2048 bits)
    // ARC4 key sizes are typically in the range of 
    // 40 to 128 bits.
    // The KeyLength property is specified in bits:
    crypt.put_KeyLength(128);

    // Note: The PaddingScheme and CipherMode properties
    // do not apply w/ ARC4.  ARC4 does not encrypt in blocks --
    // it is a streaming encryption algorithm. The number of output bytes
    // is exactly equal to the number of input bytes.

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.put_EncodingMode("hex");

    // Note: ARC4 does not utilize initialization vectors.  IV's only
    // apply to block encryption algorithms.  

    // The secret key must equal the size of the key.
    // For 128-bit encryption, the binary secret key is 16 bytes.
    const char *keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    crypt.SetEncodedKey(keyHex,"hex");

    // Encrypt a string...
    // The output length is exactly equal to the input.  In this
    // example, the input string is 44 chars (ANSI bytes) so the
    // output is 44 bytes -- and when hex encoded results in an
    // 88-char string (2 chars per byte for the hex encoding).
    const char *encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    strOut.append(encStr);
    strOut.append("\r\n");

    // Now decrypt:
    const char *decStr = crypt.decryptStringENC(encStr);
    strOut.append(decStr);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }