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49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/*
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* Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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/* GF(2^128) defined by f(x) = x^128 + x^7 + x^2 + x + 1
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* A + B mod f(x) = a xor b
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* A * 2 mod f(x)
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*/
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#ifndef GMSSL_GF128_H
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#define GMSSL_GF128_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef uint64_t gf128_t[2];
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void gf128_set_zero(gf128_t r);
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void gf128_set_one(gf128_t r);
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void gf128_add(gf128_t r, const gf128_t a, const gf128_t b);
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void gf128_mul(gf128_t r, const gf128_t a, const gf128_t b);
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void gf128_mul_by_2(gf128_t r, const gf128_t a);
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void gf128_from_bytes(gf128_t r, const uint8_t p[16]);
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void gf128_to_bytes(const gf128_t a, uint8_t p[16]);
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int gf128_from_hex(gf128_t r, const char *s);
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int gf128_equ_hex(const gf128_t a, const char *s);
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int gf128_print(FILE *fp, int fmt, int ind, const char *label, const gf128_t a);
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#ifdef __cplusplus
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}
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#endif
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#endif
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