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41 results

blowfish.h

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  • Forked from Nettle / nettle
    1796 commits behind, 2 commits ahead of the upstream repository.
    blowfish.h 2.21 KiB
    /* blowfish.h
     *
     * Blowfish block cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2014 Niels Möller
     * Copyright (C) 1998, 2001 FSF, Ray Dassen, Niels Möller
     *
     * The nettle library 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.
     * 
     * The nettle library 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 the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
     
    #ifndef NETTLE_BLOWFISH_H_INCLUDED
    #define NETTLE_BLOWFISH_H_INCLUDED
    
    #include "nettle-types.h"
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    /* Name mangling */
    #define blowfish_set_key nettle_blowfish_set_key
    #define blowfish128_set_key nettle_blowfish128_set_key
    #define blowfish_encrypt nettle_blowfish_encrypt
    #define blowfish_decrypt nettle_blowfish_decrypt
    
    #define BLOWFISH_BLOCK_SIZE 8
    
    /* Variable key size between 64 and 448 bits. */
    #define BLOWFISH_MIN_KEY_SIZE 8
    #define BLOWFISH_MAX_KEY_SIZE 56
    
    /* Default to 128 bits */
    #define BLOWFISH_KEY_SIZE 16
    
    #define BLOWFISH128_KEY_SIZE 16
    
    #define _BLOWFISH_ROUNDS 16
    
    struct blowfish_ctx
    {
      uint32_t s[4][256];
      uint32_t p[_BLOWFISH_ROUNDS+2];
    };
    
    /* Returns 0 for weak keys, otherwise 1. */
    int
    blowfish_set_key(struct blowfish_ctx *ctx,
                     size_t length, const uint8_t *key);
    int
    blowfish128_set_key(struct blowfish_ctx *ctx, const uint8_t *key);
    
    void
    blowfish_encrypt(const struct blowfish_ctx *ctx,
                     size_t length, uint8_t *dst,
                     const uint8_t *src);
    void
    blowfish_decrypt(const struct blowfish_ctx *ctx,
                     size_t length, uint8_t *dst,
                     const uint8_t *src);
    
    #ifdef __cplusplus
    }
    #endif
    
    #endif /* NETTLE_BLOWFISH_H_INCLUDED */