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10x26 field implementation

This commit is contained in:
Pieter Wuille 2013-04-02 00:10:14 +02:00
parent da09a2d426
commit 3231676bf9
7 changed files with 510 additions and 5 deletions
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12
Makefile
View File

@ -16,6 +16,11 @@ OBJS :=
default: all
ifeq ($(CONF), gmp32)
FLAGS_COMMON := $(FLAGS_COMMON) -DUSE_NUM_GMP -DUSE_FIELD_10X26
LIBS := -lgmp
SECP256K1_FILES := $(SECP256K1_FILES) src/num_gmp.h src/num_gmp.c src/field_10x26.c src/field_10x26.h
else
ifeq ($(CONF), openssl)
FLAGS_COMMON := $(FLAGS_COMMON) -DUSE_NUM_OPENSSL -DUSE_FIELD_INV_BUILTIN
LIBS := -lcrypto
@ -39,16 +44,19 @@ SECP256K1_FILES := $(SECP256K1_FILES) src/field_5x52_int128.c
endif
endif
endif
endif
all: src/*.c src/*.asm src/*.h include/*.h
+make CONF=openssl all-openssl
+make CONF=gmp all-gmp
+make CONF=gmp32 all-gmp32
+make CONF=gmpasm all-gmpasm
clean:
+make CONF=openssl clean-openssl
+make CONF=gmp clean-gmp
+make CONF=gmp32 clean-gmp32
+make CONF=gmpasm clean-gmpasm
bench-any: bench-$(CONF)
@ -62,10 +70,10 @@ clean-$(CONF):
obj/secp256k1-$(CONF).o: $(SECP256K1_FILES) src/secp256k1.c include/secp256k1.h
$(CC) $(FLAGS_COMMON) $(FLAGS_PROD) src/secp256k1.c -c -o obj/secp256k1-$(CONF).o
bench-$(CONF): $(OBJS) src/bench.c
bench-$(CONF): $(OBJS) $(SECP256K1_FILES) src/bench.c
$(CC) $(FLAGS_COMMON) $(FLAGS_PROD) src/bench.c $(LIBS) $(OBJS) -o bench-$(CONF)
tests-$(CONF): $(OBJS) src/tests.c
tests-$(CONF): $(OBJS) $(SECP256K1_FILES) src/tests.c
$(CC) $(FLAGS_COMMON) $(FLAGS_TEST) src/tests.c $(LIBS) $(OBJS) -o tests-$(CONF)
libsecp256k1-$(CONF).a: $(OBJS) obj/secp256k1-$(CONF).o

5
src/field.c
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@ -1,5 +1,8 @@
// just one implementation for now
#ifdef USE_FIELD_10X26
#include "field_10x26.c"
#else
#include "field_5x52.c"
#endif
void static secp256k1_fe_get_hex(char *r, int *rlen, const secp256k1_fe_t *a) {
if (*rlen < 65) {

5
src/field.h
View File

@ -12,8 +12,11 @@
* normality.
*/
// just one implementation for now
#ifdef USE_FIELD_10X26
#include "field_10x26.h"
#else
#include "field_5x52.h"
#endif
typedef struct {
secp256k1_num_t p;

475
src/field_10x26.c Normal file
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@ -0,0 +1,475 @@
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include "num.h"
#include "field.h"
void static secp256k1_fe_normalize(secp256k1_fe_t *r) {
// fog("normalize in: ", r);
uint32_t c;
c = r->n[0];
uint32_t t0 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[1];
uint32_t t1 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[2];
uint32_t t2 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[3];
uint32_t t3 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[4];
uint32_t t4 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[5];
uint32_t t5 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[6];
uint32_t t6 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[7];
uint32_t t7 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[8];
uint32_t t8 = c & 0x3FFFFFFUL;
c = (c >> 26) + r->n[9];
uint32_t t9 = c & 0x03FFFFFUL;
c >>= 22;
/* r->n[0] = t0; r->n[1] = t1; r->n[2] = t2; r->n[3] = t3; r->n[4] = t4;
r->n[5] = t5; r->n[6] = t6; r->n[7] = t7; r->n[8] = t8; r->n[9] = t9;
fog(" tm1: ", r);
fprintf(stderr, "out c= %08lx\n", (unsigned long)c);*/
// The following code will not modify the t's if c is initially 0.
uint32_t d = c * 0x3D1UL + t0;
t0 = d & 0x3FFFFFFULL;
d = (d >> 26) + t1 + c*0x40;
t1 = d & 0x3FFFFFFULL;
d = (d >> 26) + t2;
t2 = d & 0x3FFFFFFULL;
d = (d >> 26) + t3;
t3 = d & 0x3FFFFFFULL;
d = (d >> 26) + t4;
t4 = d & 0x3FFFFFFULL;
d = (d >> 26) + t5;
t5 = d & 0x3FFFFFFULL;
d = (d >> 26) + t6;
t6 = d & 0x3FFFFFFULL;
d = (d >> 26) + t7;
t7 = d & 0x3FFFFFFULL;
d = (d >> 26) + t8;
t8 = d & 0x3FFFFFFULL;
d = (d >> 26) + t9;
t9 = d & 0x03FFFFFULL;
assert((d >> 22) == 0);
/* r->n[0] = t0; r->n[1] = t1; r->n[2] = t2; r->n[3] = t3; r->n[4] = t4;
r->n[5] = t5; r->n[6] = t6; r->n[7] = t7; r->n[8] = t8; r->n[9] = t9;
fog(" tm2: ", r); */
// Subtract p if result >= p
uint64_t low = ((uint64_t)t1 << 26) | t0;
uint64_t mask = -(int64_t)((t9 < 0x03FFFFFUL) | (t8 < 0x3FFFFFFUL) | (t7 < 0x3FFFFFFUL) | (t6 < 0x3FFFFFFUL) | (t5 < 0x3FFFFFFUL) | (t4 < 0x3FFFFFFUL) | (t3 < 0x3FFFFFFUL) | (t2 < 0x3FFFFFFUL) | (low < 0xFFFFEFFFFFC2FULL));
t9 &= mask;
t8 &= mask;
t7 &= mask;
t6 &= mask;
t5 &= mask;
t4 &= mask;
t3 &= mask;
t2 &= mask;
low -= (~mask & 0xFFFFEFFFFFC2FULL);
// push internal variables back
r->n[0] = low & 0x3FFFFFFUL; r->n[1] = (low >> 26) & 0x3FFFFFFUL; r->n[2] = t2; r->n[3] = t3; r->n[4] = t4;
r->n[5] = t5; r->n[6] = t6; r->n[7] = t7; r->n[8] = t8; r->n[9] = t9;
/* fog(" out: ", r);*/
#ifdef VERIFY
r->magnitude = 1;
r->normalized = 1;
#endif
}
void static inline secp256k1_fe_set_int(secp256k1_fe_t *r, int a) {
r->n[0] = a;
r->n[1] = r->n[2] = r->n[3] = r->n[4] = r->n[5] = r->n[6] = r->n[7] = r->n[8] = r->n[9] = 0;
#ifdef VERIFY
r->magnitude = 1;
r->normalized = 1;
#endif
}
// TODO: not constant time!
int static inline secp256k1_fe_is_zero(const secp256k1_fe_t *a) {
#ifdef VERIFY
assert(a->normalized);
#endif
return (a->n[0] == 0 && a->n[1] == 0 && a->n[2] == 0 && a->n[3] == 0 && a->n[4] == 0 && a->n[5] == 0 && a->n[6] == 0 && a->n[7] == 0 && a->n[8] == 0 && a->n[9] == 0);
}
int static inline secp256k1_fe_is_odd(const secp256k1_fe_t *a) {
#ifdef VERIFY
assert(a->normalized);
#endif
return a->n[0] & 1;
}
// TODO: not constant time!
int static inline secp256k1_fe_equal(const secp256k1_fe_t *a, const secp256k1_fe_t *b) {
#ifdef VERIFY
assert(a->normalized);
assert(b->normalized);
#endif
return (a->n[0] == b->n[0] && a->n[1] == b->n[1] && a->n[2] == b->n[2] && a->n[3] == b->n[3] && a->n[4] == b->n[4] &&
a->n[5] == b->n[5] && a->n[6] == b->n[6] && a->n[7] == b->n[7] && a->n[8] == b->n[8] && a->n[9] == b->n[9]);
}
void static secp256k1_fe_set_b32(secp256k1_fe_t *r, const unsigned char *a) {
r->n[0] = r->n[1] = r->n[2] = r->n[3] = r->n[4] = 0;
r->n[5] = r->n[6] = r->n[7] = r->n[8] = r->n[9] = 0;
for (int i=0; i<32; i++) {
for (int j=0; j<4; j++) {
int limb = (8*i+2*j)/26;
int shift = (8*i+2*j)%26;
r->n[limb] |= (uint32_t)((a[31-i] >> (2*j)) & 0x3) << shift;
}
}
#ifdef VERIFY
r->magnitude = 1;
r->normalized = 1;
#endif
}
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */
void static secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe_t *a) {
#ifdef VERIFY
assert(a->normalized);
#endif
for (int i=0; i<32; i++) {
int c = 0;
for (int j=0; j<4; j++) {
int limb = (8*i+2*j)/26;
int shift = (8*i+2*j)%26;
c |= ((a->n[limb] >> shift) & 0x3) << (2 * j);
}
r[31-i] = c;
}
}
void static inline secp256k1_fe_negate(secp256k1_fe_t *r, const secp256k1_fe_t *a, int m) {
#ifdef VERIFY
assert(a->magnitude <= m);
r->magnitude = m + 1;
r->normalized = 0;
#endif
r->n[0] = 0x3FFFC2FUL * (m + 1) - a->n[0];
r->n[1] = 0x3FFFFBFUL * (m + 1) - a->n[1];
r->n[2] = 0x3FFFFFFUL * (m + 1) - a->n[2];
r->n[3] = 0x3FFFFFFUL * (m + 1) - a->n[3];
r->n[4] = 0x3FFFFFFUL * (m + 1) - a->n[4];
r->n[5] = 0x3FFFFFFUL * (m + 1) - a->n[5];
r->n[6] = 0x3FFFFFFUL * (m + 1) - a->n[6];
r->n[7] = 0x3FFFFFFUL * (m + 1) - a->n[7];
r->n[8] = 0x3FFFFFFUL * (m + 1) - a->n[8];
r->n[9] = 0x03FFFFFUL * (m + 1) - a->n[9];
}
void static inline secp256k1_fe_mul_int(secp256k1_fe_t *r, int a) {
#ifdef VERIFY
r->magnitude *= a;
r->normalized = 0;
#endif
r->n[0] *= a;
r->n[1] *= a;
r->n[2] *= a;
r->n[3] *= a;
r->n[4] *= a;
r->n[5] *= a;
r->n[6] *= a;
r->n[7] *= a;
r->n[8] *= a;
r->n[9] *= a;
}
void static inline secp256k1_fe_add(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
#ifdef VERIFY
r->magnitude += a->magnitude;
r->normalized = 0;
#endif
r->n[0] += a->n[0];
r->n[1] += a->n[1];
r->n[2] += a->n[2];
r->n[3] += a->n[3];
r->n[4] += a->n[4];
r->n[5] += a->n[5];
r->n[6] += a->n[6];
r->n[7] += a->n[7];
r->n[8] += a->n[8];
r->n[9] += a->n[9];
}
void static inline secp256k1_fe_mul_inner(const uint32_t *a, const uint32_t *b, uint32_t *r) {
uint64_t c = (uint64_t)a[0] * b[0];
uint32_t t0 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[1] +
(uint64_t)a[1] * b[0];
uint32_t t1 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[2] +
(uint64_t)a[1] * b[1] +
(uint64_t)a[2] * b[0];
uint32_t t2 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[3] +
(uint64_t)a[1] * b[2] +
(uint64_t)a[2] * b[1] +
(uint64_t)a[3] * b[0];
uint32_t t3 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[4] +
(uint64_t)a[1] * b[3] +
(uint64_t)a[2] * b[2] +
(uint64_t)a[3] * b[1] +
(uint64_t)a[4] * b[0];
uint32_t t4 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[5] +
(uint64_t)a[1] * b[4] +
(uint64_t)a[2] * b[3] +
(uint64_t)a[3] * b[2] +
(uint64_t)a[4] * b[1] +
(uint64_t)a[5] * b[0];
uint32_t t5 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[6] +
(uint64_t)a[1] * b[5] +
(uint64_t)a[2] * b[4] +
(uint64_t)a[3] * b[3] +
(uint64_t)a[4] * b[2] +
(uint64_t)a[5] * b[1] +
(uint64_t)a[6] * b[0];
uint32_t t6 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[7] +
(uint64_t)a[1] * b[6] +
(uint64_t)a[2] * b[5] +
(uint64_t)a[3] * b[4] +
(uint64_t)a[4] * b[3] +
(uint64_t)a[5] * b[2] +
(uint64_t)a[6] * b[1] +
(uint64_t)a[7] * b[0];
uint32_t t7 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[8] +
(uint64_t)a[1] * b[7] +
(uint64_t)a[2] * b[6] +
(uint64_t)a[3] * b[5] +
(uint64_t)a[4] * b[4] +
(uint64_t)a[5] * b[3] +
(uint64_t)a[6] * b[2] +
(uint64_t)a[7] * b[1] +
(uint64_t)a[8] * b[0];
uint32_t t8 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[0] * b[9] +
(uint64_t)a[1] * b[8] +
(uint64_t)a[2] * b[7] +
(uint64_t)a[3] * b[6] +
(uint64_t)a[4] * b[5] +
(uint64_t)a[5] * b[4] +
(uint64_t)a[6] * b[3] +
(uint64_t)a[7] * b[2] +
(uint64_t)a[8] * b[1] +
(uint64_t)a[9] * b[0];
uint32_t t9 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[1] * b[9] +
(uint64_t)a[2] * b[8] +
(uint64_t)a[3] * b[7] +
(uint64_t)a[4] * b[6] +
(uint64_t)a[5] * b[5] +
(uint64_t)a[6] * b[4] +
(uint64_t)a[7] * b[3] +
(uint64_t)a[8] * b[2] +
(uint64_t)a[9] * b[1];
uint32_t t10 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[2] * b[9] +
(uint64_t)a[3] * b[8] +
(uint64_t)a[4] * b[7] +
(uint64_t)a[5] * b[6] +
(uint64_t)a[6] * b[5] +
(uint64_t)a[7] * b[4] +
(uint64_t)a[8] * b[3] +
(uint64_t)a[9] * b[2];
uint32_t t11 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[3] * b[9] +
(uint64_t)a[4] * b[8] +
(uint64_t)a[5] * b[7] +
(uint64_t)a[6] * b[6] +
(uint64_t)a[7] * b[5] +
(uint64_t)a[8] * b[4] +
(uint64_t)a[9] * b[3];
uint32_t t12 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[4] * b[9] +
(uint64_t)a[5] * b[8] +
(uint64_t)a[6] * b[7] +
(uint64_t)a[7] * b[6] +
(uint64_t)a[8] * b[5] +
(uint64_t)a[9] * b[4];
uint32_t t13 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[5] * b[9] +
(uint64_t)a[6] * b[8] +
(uint64_t)a[7] * b[7] +
(uint64_t)a[8] * b[6] +
(uint64_t)a[9] * b[5];
uint32_t t14 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[6] * b[9] +
(uint64_t)a[7] * b[8] +
(uint64_t)a[8] * b[7] +
(uint64_t)a[9] * b[6];
uint32_t t15 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[7] * b[9] +
(uint64_t)a[8] * b[8] +
(uint64_t)a[9] * b[7];
uint32_t t16 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[8] * b[9] +
(uint64_t)a[9] * b[8];
uint32_t t17 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[9] * b[9];
uint32_t t18 = c & 0x3FFFFFFUL; c = c >> 26;
uint32_t t19 = c;
c = t0 + (uint64_t)t10 * 0x3D10UL;
t0 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t1 + (uint64_t)t10*0x400UL + (uint64_t)t11 * 0x3D10UL;
t1 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t2 + (uint64_t)t11*0x400UL + (uint64_t)t12 * 0x3D10UL;
t2 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t3 + (uint64_t)t12*0x400UL + (uint64_t)t13 * 0x3D10UL;
r[3] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t4 + (uint64_t)t13*0x400UL + (uint64_t)t14 * 0x3D10UL;
r[4] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t5 + (uint64_t)t14*0x400UL + (uint64_t)t15 * 0x3D10UL;
r[5] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t6 + (uint64_t)t15*0x400UL + (uint64_t)t16 * 0x3D10UL;
r[6] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t7 + (uint64_t)t16*0x400UL + (uint64_t)t17 * 0x3D10UL;
r[7] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t8 + (uint64_t)t17*0x400UL + (uint64_t)t18 * 0x3D10UL;
r[8] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t9 + (uint64_t)t18*0x400UL + (uint64_t)t19 * 0x1000003D10ULL;
r[9] = c & 0x03FFFFFUL; c = c >> 22;
uint64_t d = t0 + c * 0x3D1UL;
r[0] = d & 0x3FFFFFFUL; d = d >> 26;
d = d + t1 + c*0x40;
r[1] = d & 0x3FFFFFFUL; d = d >> 26;
r[2] = t2 + d;
}
void static inline secp256k1_fe_sqr_inner(const uint32_t *a, uint32_t *r) {
uint64_t c = (uint64_t)a[0] * a[0];
uint32_t t0 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[1];
uint32_t t1 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[2] +
(uint64_t)a[1] * a[1];
uint32_t t2 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[3] +
(uint64_t)(a[1]*2) * a[2];
uint32_t t3 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[4] +
(uint64_t)(a[1]*2) * a[3] +
(uint64_t)a[2] * a[2];
uint32_t t4 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[5] +
(uint64_t)(a[1]*2) * a[4] +
(uint64_t)(a[2]*2) * a[3];
uint32_t t5 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[6] +
(uint64_t)(a[1]*2) * a[5] +
(uint64_t)(a[2]*2) * a[4] +
(uint64_t)a[3] * a[3];
uint32_t t6 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[7] +
(uint64_t)(a[1]*2) * a[6] +
(uint64_t)(a[2]*2) * a[5] +
(uint64_t)(a[3]*2) * a[4];
uint32_t t7 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[8] +
(uint64_t)(a[1]*2) * a[7] +
(uint64_t)(a[2]*2) * a[6] +
(uint64_t)(a[3]*2) * a[5] +
(uint64_t)a[4] * a[4];
uint32_t t8 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[0]*2) * a[9] +
(uint64_t)(a[1]*2) * a[8] +
(uint64_t)(a[2]*2) * a[7] +
(uint64_t)(a[3]*2) * a[6] +
(uint64_t)(a[4]*2) * a[5];
uint32_t t9 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[1]*2) * a[9] +
(uint64_t)(a[2]*2) * a[8] +
(uint64_t)(a[3]*2) * a[7] +
(uint64_t)(a[4]*2) * a[6] +
(uint64_t)a[5] * a[5];
uint32_t t10 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[2]*2) * a[9] +
(uint64_t)(a[3]*2) * a[8] +
(uint64_t)(a[4]*2) * a[7] +
(uint64_t)(a[5]*2) * a[6];
uint32_t t11 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[3]*2) * a[9] +
(uint64_t)(a[4]*2) * a[8] +
(uint64_t)(a[5]*2) * a[7] +
(uint64_t)a[6] * a[6];
uint32_t t12 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[4]*2) * a[9] +
(uint64_t)(a[5]*2) * a[8] +
(uint64_t)(a[6]*2) * a[7];
uint32_t t13 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[5]*2) * a[9] +
(uint64_t)(a[6]*2) * a[8] +
(uint64_t)a[7] * a[7];
uint32_t t14 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[6]*2) * a[9] +
(uint64_t)(a[7]*2) * a[8];
uint32_t t15 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[7]*2) * a[9] +
(uint64_t)a[8] * a[8];
uint32_t t16 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)(a[8]*2) * a[9];
uint32_t t17 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + (uint64_t)a[9] * a[9];
uint32_t t18 = c & 0x3FFFFFFUL; c = c >> 26;
uint32_t t19 = c;
c = t0 + (uint64_t)t10 * 0x3D10UL;
t0 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t1 + (uint64_t)t10*0x400UL + (uint64_t)t11 * 0x3D10UL;
t1 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t2 + (uint64_t)t11*0x400UL + (uint64_t)t12 * 0x3D10UL;
t2 = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t3 + (uint64_t)t12*0x400UL + (uint64_t)t13 * 0x3D10UL;
r[3] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t4 + (uint64_t)t13*0x400UL + (uint64_t)t14 * 0x3D10UL;
r[4] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t5 + (uint64_t)t14*0x400UL + (uint64_t)t15 * 0x3D10UL;
r[5] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t6 + (uint64_t)t15*0x400UL + (uint64_t)t16 * 0x3D10UL;
r[6] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t7 + (uint64_t)t16*0x400UL + (uint64_t)t17 * 0x3D10UL;
r[7] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t8 + (uint64_t)t17*0x400UL + (uint64_t)t18 * 0x3D10UL;
r[8] = c & 0x3FFFFFFUL; c = c >> 26;
c = c + t9 + (uint64_t)t18*0x400UL + (uint64_t)t19 * 0x1000003D10ULL;
r[9] = c & 0x03FFFFFUL; c = c >> 22;
uint64_t d = t0 + c * 0x3D1UL;
r[0] = d & 0x3FFFFFFUL; d = d >> 26;
d = d + t1 + c*0x40;
r[1] = d & 0x3FFFFFFUL; d = d >> 26;
r[2] = t2 + d;
}
void static secp256k1_fe_mul(secp256k1_fe_t *r, const secp256k1_fe_t *a, const secp256k1_fe_t *b) {
#ifdef VERIFY
assert(a->magnitude <= 8);
assert(b->magnitude <= 8);
r->magnitude = 1;
r->normalized = 0;
#endif
secp256k1_fe_mul_inner(a->n, b->n, r->n);
}
void static secp256k1_fe_sqr(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
#ifdef VERIFY
assert(a->magnitude <= 8);
r->magnitude = 1;
r->normalized = 0;
#endif
secp256k1_fe_sqr_inner(a->n, r->n);
}

15
src/field_10x26.h Normal file
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@ -0,0 +1,15 @@
#ifndef _SECP256K1_FIELD_10x26_
#define _SECP256K1_FIELD_10x26_
#include <stdint.h>
typedef struct {
// X = sum(i=0..9, elem[i]*2^26) mod n
uint32_t n[10];
#ifdef VERIFY
int magnitude;
int normalized;
#endif
} secp256k1_fe_t;
#endif

1
src/field_5x52.c
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@ -42,6 +42,7 @@ void static secp256k1_fe_normalize(secp256k1_fe_t *r) {
t3 = c & 0xFFFFFFFFFFFFFULL;
c = (c >> 52) + t4;
t4 = c & 0x0FFFFFFFFFFFFULL;
assert((c >> 48) == 0);
// Subtract p if result >= p
uint64_t mask = -(int64_t)((t4 < 0xFFFFFFFFFFFFULL) | (t3 < 0xFFFFFFFFFFFFFULL) | (t2 < 0xFFFFFFFFFFFFFULL) | (t1 < 0xFFFFFFFFFFFFFULL) | (t0 < 0xFFFFEFFFFFC2FULL));

2
src/field_5x52_int128.c
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@ -1,7 +1,7 @@
#include "field.h"
void static inline secp256k1_fe_mul_inner(const uint64_t *a, const uint64_t *b, uint64_t *r) {
unsigned __int128 c = (__int128)a[0] * b[0];
__int128 c = (__int128)a[0] * b[0];
uint64_t t0 = c & 0xFFFFFFFFFFFFFULL; c = c >> 52; // c max 0FFFFFFFFFFFFFE0
c = c + (__int128)a[0] * b[1] +
(__int128)a[1] * b[0];