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-The RC4 library.
-RC4 is a stream cipher that operates on a byte stream.  It can be used with
-any length key but I would recommend normally using 16 bytes.
-
-This library requires the inclusion of 'rc4.h'.
-
-The RC4 encryption function takes what is called an RC4_KEY as an argument.
-The RC4_KEY is generated by the RC4_set_key function from the key bytes.
-
-RC4, being a stream cipher, does not have an encryption or decryption mode.
-It produces a stream of bytes that the input stream is xor'ed against and
-so decryption is just a case of 'encrypting' again with the same key.
-
-I have only put in one 'mode' for RC4 which is the normal one.  This means
-there is no initialisation vector and there is no feedback of the cipher
-text into the cipher.  This implies that you should not ever use the
-same key twice if you can help it.  If you do, you leave yourself open to
-known plain text attacks; if you know the plain text and
-corresponding cipher text in one message, all messages that used the same
-key can have the cipher text decoded for the corresponding positions in the
-cipher stream.
-
-The main positive feature of RC4 is that it is a very fast cipher; about 4
-times faster that DES.  This makes it ideally suited to protocols where the
-key is randomly chosen, like SSL.
-
-The functions are as follows:
-
-void RC4_set_key(
-RC4_KEY *key;
-int len;
-unsigned char *data);
-	This function initialises the RC4_KEY structure with the key passed
-	in 'data', which is 'len' bytes long.  The key data can be any
-	length but 16 bytes seems to be a good number.
-
-void RC4(
-RC4_KEY *key;
-unsigned long len;
-unsigned char *in;
-unsigned char *out);
-	Do the actual RC4 encryption/decryption.  Using the 'key', 'len'
-	bytes are transformed from 'in' to 'out'.  As mentioned above,
-	decryption is the operation as encryption.