text: #ifndef RC4_H
  #define RC4_H
  #include "wm_crypto_hard.h"
  
  void Arc4Init(psCipherContext_t *ctx, unsigned char *key, uint32 keylen);
  int32 Arc4_skip(psCipherContext_t *ctx, unsigned char *in,
  			   unsigned char *out, size_t skip, uint32 len);
  /**
   * rc4_skip - XOR RC4 stream to given data with skip-stream-start
   * @key: RC4 key
   * @keylen: RC4 key length
   * @skip: number of bytes to skip from the beginning of the RC4 stream
   * @data: data to be XOR'ed with RC4 stream
   * @data_len: buf length
   * Returns: 0 on success, -1 on failure
   *
   * Generate RC4 pseudo random stream for the given key, skip beginning of the
   * stream, and XOR the end result with the data buffer to perform RC4
   * encryption/decryption.
   */
  int rc4_skip(const u8 *key, size_t keylen, size_t skip,
  	     u8 *data, size_t data_len);
  /**
   * rc4 - XOR RC4 stream to given data with skip-stream-start
   * @key: RC4 key
   * @keylen: RC4 key length
   * @data: data to be XOR'ed with RC4 stream
   * @data_len: buf length
   * Returns: 0 on success, -1 on failure
   *
   * Generate RC4 pseudo random stream for the given key, skip beginning of the
   * stream, and XOR the end result with the data buffer to perform RC4
   * encryption/decryption.
   */
  
  int rc4(const u8 *key, size_t keylen, u8 *data, size_t data_len);
  
  #endif /* end of RC4_H */
  