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50791508b1
Make private inlines in C files 'static inline', not just 'inline', or the compiler can discard the definition if it chooses not to inline it. Make functions declared in header files not be declared inline (if they're defined in a .c file). It looks like no functions in this category are used in LibSRTP's critical path, only for unit tests or generating AES tables. To see the problem prior to this commit, compile with "gcc -O0 -std=gnu99". Signed-off-by: Travis Cross <tc@traviscross.com> This cherry-picks commit e2774dbd551ffe5f872eaec2b2d40b712a54e1ba from libsrtp upstream. FS-6196 --resolve
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* gf2_8.c
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*
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* GF(256) finite field implementation, with the representation used
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* in the AES cipher.
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright (c) 2001-2005, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "datatypes.h"
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#include "gf2_8.h"
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/* gf2_8_shift() moved to gf2_8.h as an inline function */
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gf2_8
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gf2_8_multiply(gf2_8 x, gf2_8 y) {
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gf2_8 z = 0;
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if (y & 1) z ^= x; x = gf2_8_shift(x);
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if (y & 2) z ^= x; x = gf2_8_shift(x);
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if (y & 4) z ^= x; x = gf2_8_shift(x);
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if (y & 8) z ^= x; x = gf2_8_shift(x);
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if (y & 16) z ^= x; x = gf2_8_shift(x);
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if (y & 32) z ^= x; x = gf2_8_shift(x);
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if (y & 64) z ^= x; x = gf2_8_shift(x);
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if (y & 128) z ^= x;
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return z;
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}
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/* this should use the euclidean algorithm */
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gf2_8
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gf2_8_compute_inverse(gf2_8 x) {
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unsigned int i;
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if (x == 0) return 0; /* zero is a special case */
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for (i=0; i < 256; i++)
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if (gf2_8_multiply((gf2_8) i, x) == 1)
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return (gf2_8) i;
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return 0;
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}
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