The Tor Browser: netwerk/srtp/src/crypto/include/gf2

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * gf2_8.h

     3  *

     4  * GF(256) implementation

     5  *

     6  * David A. McGrew

     7  * Cisco Systems, Inc.

     8  */

    10 /*

    11  *

    12  * Copyright (c) 2001-2006, Cisco Systems, Inc.

    13  * All rights reserved.

    14  *

    15  * Redistribution and use in source and binary forms, with or without

    16  * modification, are permitted provided that the following conditions

    17  * are met:

    18  *

    19  *   Redistributions of source code must retain the above copyright

    20  *   notice, this list of conditions and the following disclaimer.

    21  *

    22  *   Redistributions in binary form must reproduce the above

    23  *   copyright notice, this list of conditions and the following

    24  *   disclaimer in the documentation and/or other materials provided

    25  *   with the distribution.

    26  *

    27  *   Neither the name of the Cisco Systems, Inc. nor the names of its

    28  *   contributors may be used to endorse or promote products derived

    29  *   from this software without specific prior written permission.

    30  *

    31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

    34  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

    35  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

    36  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    37  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

    38  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

    40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

    42  * OF THE POSSIBILITY OF SUCH DAMAGE.

    43  *

    44  */

    47 #ifndef GF2_8_H

    48 #define GF2_8_H

    50 #include "datatypes.h"  /* for uint8_t definition */

    52 typedef uint8_t gf2_8;

    54 #define gf2_8_field_polynomial 0x1B

    56 /*

    57  * gf2_8_shift(x) returns

    58  */

    60 /*

    61  * gf2_8_shift(z) returns the result of the GF(2^8) 'multiply by x'

    62  * operation, using the field representation from AES; that is, the

    63  * next gf2_8 value in the cyclic representation of that field.  The

    64  * value z should be an uint8_t.

    65  */

    67 #define gf2_8_shift(z) (((z) & 128) ? \

    68        (((z) << 1) ^ gf2_8_field_polynomial) : ((z) << 1))

    70 gf2_8

    71 gf2_8_compute_inverse(gf2_8 x);

    73 void

    74 test_gf2_8(void);

    76 gf2_8

    77 gf2_8_multiply(gf2_8 x, gf2_8 y);

    79 #endif /* GF2_8_H */

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