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                    int ARC4_stream_encrypt(void *rc4State, const uint8_t in[],
                                            uint8_t out[], size_t len);
                    int ARC4_stream_init(uint8_t *key, size_t keylen,
                                         void **pRc4State);
                    int ARC4_stream_destroy(void *rc4State);
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ARC4CipherzcARC4 cipher object. Do not create it directly. Use
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    :Keyword Arguments:
        *   *drop* (``integer``) --
            The amount of bytes to discard from the initial part of the keystream.
            In fact, such part has been found to be distinguishable from random
            data (while it shouldn't) and also correlated to key.

            The recommended value is 3072_ bytes. The default value is 0.

    :Return: an `ARC4Cipher` object

    .. _3072: http://eprint.iacr.org/2002/067.pdf
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