ARC4 Encryption (ARCFOUR)

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

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#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkCrypt2 crypt;

    bool success;
    success = crypt.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        printf("Crypt component unlock failed\n");
        return;
    }

    //  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;
    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;
    encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    printf("%s\n",encStr);

    //  Now decrypt:
    const char * decStr;
    decStr = crypt.decryptStringENC(encStr);
    printf("%s\n",decStr);
    }