65 lines
1.1 KiB
C
65 lines
1.1 KiB
C
#ifndef SC_H
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#define SC_H
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#include <stddef.h>
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#include <stdint.h>
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#include "bitness.h"
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#include "compat.h"
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#include "limb.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef USE_64BIT
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#define SC_LIMB_NUM 5
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#define SC_LIMB_BITS 52
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#define SC_LIMB_MASK ((1L << SC_LIMB_BITS)-1)
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#else
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#define SC_LIMB_NUM 10
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#define SC_LIMB_BITS 26
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#define SC_LIMB_MASK ((1 << SC_LIMB_BITS)-1)
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#endif
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#define SC_BITS (SC_LIMB_NUM * SC_LIMB_BITS)
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/* sc_t holds 260bit in reduced form */
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typedef limb_t sc_t[SC_LIMB_NUM];
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/* lsc_t is double in size and holds up to 520bits in reduced form */
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typedef limb_t lsc_t [2*SC_LIMB_NUM];
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extern const sc_t con_off;
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void sc_reduce(sc_t dst, const sc_t src);
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void sc_import(sc_t dst, const uint8_t *src, size_t len);
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void sc_export(uint8_t dst[32], const sc_t x);
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void sc_mul(sc_t res, const sc_t a, const sc_t b);
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int sc_jsf(int u0[SC_BITS+1], int u1[SC_BITS+1], const sc_t a, const sc_t b);
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static INLINE void
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sc_add(sc_t res, const sc_t a, const sc_t b)
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{
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int i;
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for (i = 0; i < SC_LIMB_NUM; i++)
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res[i] = a[i] + b[i];
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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