gfiber / vendor / opensource / ffmpeg / ff272e5c57f29e110b3d32cd1dbd8f1ec2fa542d / . / libavutil / rc4.h

/* | |

* RC4 encryption/decryption/pseudo-random number generator | |

* | |

* This file is part of FFmpeg. | |

* | |

* FFmpeg is free software; you can redistribute it and/or | |

* modify it under the terms of the GNU Lesser General Public | |

* License as published by the Free Software Foundation; either | |

* version 2.1 of the License, or (at your option) any later version. | |

* | |

* FFmpeg is distributed in the hope that it will be useful, | |

* but WITHOUT ANY WARRANTY; without even the implied warranty of | |

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |

* Lesser General Public License for more details. | |

* | |

* You should have received a copy of the GNU Lesser General Public | |

* License along with FFmpeg; if not, write to the Free Software | |

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |

*/ | |

#ifndef AVUTIL_RC4_H | |

#define AVUTIL_RC4_H | |

#include <stdint.h> | |

struct AVRC4 { | |

uint8_t state[256]; | |

int x, y; | |

}; | |

/** | |

* \brief Initializes an AVRC4 context. | |

* | |

* \param key_bits must be a multiple of 8 | |

* \param decrypt 0 for encryption, 1 for decryption, currently has no effect | |

*/ | |

int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt); | |

/** | |

* \brief Encrypts / decrypts using the RC4 algorithm. | |

* | |

* \param count number of bytes | |

* \param dst destination array, can be equal to src | |

* \param src source array, can be equal to dst, may be NULL | |

* \param iv not (yet) used for RC4, should be NULL | |

* \param decrypt 0 for encryption, 1 for decryption, not (yet) used | |

*/ | |

void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); | |

#endif /* AVUTIL_RC4_H */ |