LIBFMSR
0.1
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00001 00007 /* =================================================================== 00008 Copyright (c) 2013, Henry C. H. Chen 00009 All rights reserved. 00010 00011 Redistribution and use in source and binary forms, with or without 00012 modification, are permitted provided that the following conditions are 00013 met: 00014 00015 - Redistributions of source code must retain the above copyright 00016 notice, this list of conditions and the following disclaimer. 00017 00018 - Redistributions in binary form must reproduce the above copyright 00019 notice, this list of conditions and the following disclaimer in 00020 the documentation and/or other materials provided with the 00021 distribution. 00022 00023 - Neither the name of the Chinese University of Hong Kong nor the 00024 names of its contributors may be used to endorse or promote 00025 products derived from this software without specific prior written 00026 permission. 00027 00028 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00029 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00030 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00031 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00032 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00033 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00034 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00035 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00036 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00037 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00038 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00039 =================================================================== */ 00040 00041 00042 #ifndef LIBFMSR_GF_H 00043 #define LIBFMSR_GF_H 00044 00045 #include <stdlib.h> 00046 00047 #ifndef LIBFMSR_GF 00048 #define LIBFMSR_GF 00049 typedef unsigned char gf; 00050 #endif 00051 00052 /* ------------------------------------------------------------------ */ 00053 /* | initialize all lookup tables (call first before doing anything!) | */ 00054 /* ------------------------------------------------------------------ */ 00055 void gf_init(void); 00056 00057 00058 /* -------------------------------- */ 00059 /* | single table lookup operations | */ 00060 /* -------------------------------- */ 00061 gf gf_mul(gf a, gf b); // a*b 00062 gf gf_div(gf a, gf b); // a/b, undefined for a=0 or b=0 00063 gf gf_inv(gf a); // a^{-1}, undefined for a=0 00064 gf gf_log(gf a); // log(a), undefined for a=0 00065 gf gf_x(gf a); // x^a 00066 00067 00068 /* --------------------------------------------------------- */ 00069 /* | multi-byte operations (faster than per-byte operations) | */ 00070 /* --------------------------------------------------------- */ 00073 void gf_mul_bytes(gf *a, size_t len, gf b, gf *c); 00074 00077 void gf_mulxor_bytes(gf *a, size_t len, gf b, gf *c); 00078 00079 00080 #endif /* LIBFMSR_GF_H */ 00081