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Member "tc-play-3.3/generic_xts.h" (2 Mar 2020, 1796 Bytes) of package /linux/misc/tc-play-3.3.tar.gz:


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    1 /*
    2  * Copyright (C) 2008, Damien Miller
    3  * Copyright (C) 2011, Alex Hornung
    4  *
    5  * Permission to use, copy, and modify this software with or without fee
    6  * is hereby granted, provided that this entire notice is included in
    7  * all copies of any software which is or includes a copy or
    8  * modification of this software.
    9  * You may use this code under the GNU public license if you so wish. Please
   10  * contribute changes back to the authors under this freer than GPL license
   11  * so that we may further the use of strong encryption without limitations to
   12  * all.
   13  *
   14  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   15  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   16  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   17  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   18  * PURPOSE.
   19  */
   20 
   21 #include <inttypes.h>
   22 #define XTS_MAX_BLOCKSIZE   16
   23 #define XTS_IVSIZE      8
   24 #define XTS_ALPHA       0x87    /* GF(2^128) generator polynomial */
   25 
   26 typedef int (*encrypt_decrypt_fn)(void *, size_t, const uint8_t *, uint8_t *);
   27 typedef int (*set_key_fn)(void **, void *, void *, const uint8_t *, int);
   28 typedef int (*zero_key_fn)(void **);
   29 
   30 
   31 struct xts_ctx {
   32     encrypt_decrypt_fn  encrypt_fn;
   33     encrypt_decrypt_fn  decrypt_fn;
   34     set_key_fn      set_key_fn;
   35     zero_key_fn     zero_key_fn;
   36 
   37     void        *ctx1;
   38     void        *ctx2;
   39     uint8_t     tweak[XTS_MAX_BLOCKSIZE];
   40     uint32_t    blk_sz;
   41 };
   42 
   43 int xts_init(struct xts_ctx *ctxp, void *arg1, void *arg2, set_key_fn set_key_fn,
   44     zero_key_fn zero_key_fn, encrypt_decrypt_fn encrypt_fn,
   45     encrypt_decrypt_fn decrypt_fn, uint32_t blk_sz, uint8_t *key, int len);
   46 int xts_encrypt(struct xts_ctx *ctx, uint8_t *data, size_t len, uint8_t *iv);
   47 int xts_decrypt(struct xts_ctx *ctx, uint8_t *data, size_t len, uint8_t *iv);
   48 int xts_uninit(struct xts_ctx *ctxp);
   49