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126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
#ifndef ed25519_ref10_H
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#define ed25519_ref10_H
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#include <stddef.h>
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#include <stdint.h>
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/*
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fe means field element.
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Here the field is \Z/(2^255-19).
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*/
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#ifdef HAVE_TI_MODE
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typedef uint64_t fe25519[5];
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#else
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typedef int32_t fe25519[10];
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#endif
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void fe25519_invert(fe25519 out, const fe25519 z);
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void fe25519_frombytes(fe25519 h, const unsigned char *s);
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void fe25519_tobytes(unsigned char *s, const fe25519 h);
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#ifdef HAVE_TI_MODE
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# include "ed25519_ref10_fe_51.h"
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#else
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# include "ed25519_ref10_fe_25_5.h"
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#endif
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/*
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ge means group element.
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Here the group is the set of pairs (x,y) of field elements
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satisfying -x^2 + y^2 = 1 + d x^2y^2
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where d = -121665/121666.
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Representations:
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ge25519_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
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ge25519_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
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ge25519_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
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ge25519_precomp (Duif): (y+x,y-x,2dxy)
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*/
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typedef struct {
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fe25519 X;
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fe25519 Y;
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fe25519 Z;
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} ge25519_p2;
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typedef struct {
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fe25519 X;
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fe25519 Y;
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fe25519 Z;
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fe25519 T;
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} ge25519_p3;
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typedef struct {
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fe25519 X;
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fe25519 Y;
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fe25519 Z;
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fe25519 T;
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} ge25519_p1p1;
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typedef struct {
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fe25519 yplusx;
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fe25519 yminusx;
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fe25519 xy2d;
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} ge25519_precomp;
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typedef struct {
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fe25519 YplusX;
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fe25519 YminusX;
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fe25519 Z;
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fe25519 T2d;
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} ge25519_cached;
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void ge25519_tobytes(unsigned char *s, const ge25519_p2 *h);
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void ge25519_p3_tobytes(unsigned char *s, const ge25519_p3 *h);
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int ge25519_frombytes(ge25519_p3 *h, const unsigned char *s);
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int ge25519_frombytes_negate_vartime(ge25519_p3 *h, const unsigned char *s);
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void ge25519_p3_to_cached(ge25519_cached *r, const ge25519_p3 *p);
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void ge25519_p1p1_to_p2(ge25519_p2 *r, const ge25519_p1p1 *p);
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void ge25519_p1p1_to_p3(ge25519_p3 *r, const ge25519_p1p1 *p);
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void ge25519_add(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_cached *q);
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void ge25519_sub(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_cached *q);
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void ge25519_scalarmult_base(ge25519_p3 *h, const unsigned char *a);
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void ge25519_double_scalarmult_vartime(ge25519_p2 *r, const unsigned char *a,
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const ge25519_p3 *A,
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const unsigned char *b);
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void ge25519_scalarmult(ge25519_p3 *h, const unsigned char *a,
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const ge25519_p3 *p);
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int ge25519_is_canonical(const unsigned char *s);
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int ge25519_is_on_curve(const ge25519_p3 *p);
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int ge25519_is_on_main_subgroup(const ge25519_p3 *p);
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int ge25519_has_small_order(const unsigned char s[32]);
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void ge25519_from_uniform(unsigned char s[32], const unsigned char r[32]);
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/*
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The set of scalars is \Z/l
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where l = 2^252 + 27742317777372353535851937790883648493.
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*/
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void sc25519_reduce(unsigned char *s);
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void sc25519_muladd(unsigned char *s, const unsigned char *a,
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const unsigned char *b, const unsigned char *c);
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int sc25519_is_canonical(const unsigned char *s);
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#endif
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