Unicode C

ARC4 Encryption (ARCFOUR)

See more Encryption Examples

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

#include <C_CkCrypt2W.h>

void ChilkatSample(void)
    {
    HCkCrypt2W crypt;
    const wchar_t *keyHex;
    const wchar_t *encStr;
    const wchar_t *decStr;

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

    crypt = CkCrypt2W_Create();

    //  Set the encryption algorithm = "arc4"	
    CkCrypt2W_putCryptAlgorithm(crypt,L"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:
    CkCrypt2W_putKeyLength(crypt,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".
    CkCrypt2W_putEncodingMode(crypt,L"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.
    keyHex = L"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    CkCrypt2W_SetEncodedKey(crypt,keyHex,L"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).
    encStr = CkCrypt2W_encryptStringENC(crypt,L"The quick brown fox jumps over the lazy dog.");
    wprintf(L"%s\n",encStr);

    //  Now decrypt:
    decStr = CkCrypt2W_decryptStringENC(crypt,encStr);
    wprintf(L"%s\n",decStr);


    CkCrypt2W_Dispose(crypt);

    }