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

/* | |

* DES encryption/decryption | |

* Copyright (c) 2007 Reimar Doeffinger | |

* | |

* 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_DES_H | |

#define AVUTIL_DES_H | |

#include <stdint.h> | |

struct AVDES { | |

uint64_t round_keys[3][16]; | |

int triple_des; | |

}; | |

/** | |

* \brief Initializes an AVDES context. | |

* | |

* \param key_bits must be 64 or 192 | |

* \param decrypt 0 for encryption, 1 for decryption | |

*/ | |

int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); | |

/** | |

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

* | |

* \param count number of 8 byte blocks | |

* \param dst destination array, can be equal to src, must be 8-byte aligned | |

* \param src source array, can be equal to dst, must be 8-byte aligned, may be NULL | |

* \param iv initialization vector for CBC mode, if NULL then ECB will be used, | |

* must be 8-byte aligned | |

* \param decrypt 0 for encryption, 1 for decryption | |

*/ | |

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

#endif /* AVUTIL_DES_H */ |