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miscellaneous crypto updates

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This commit is contained in:
koe 2022-12-01 17:53:17 -06:00
parent 9367b432f6
commit b1bce857c9
5 changed files with 18 additions and 6 deletions
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5
src/crypto/crypto-ops.c
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@ -38,7 +38,6 @@ DISABLE_VS_WARNINGS(4146 4244)
/* Predeclarations */
static void fe_mul(fe, const fe, const fe);
static void fe_sq(fe, const fe);
static void ge_madd(ge_p1p1 *, const ge_p3 *, const ge_precomp *);
static void ge_msub(ge_p1p1 *, const ge_p3 *, const ge_precomp *);
@ -72,7 +71,7 @@ uint64_t load_4(const unsigned char *in)
h = 0
*/
static void fe_0(fe h) {
void fe_0(fe h) {
h[0] = 0;
h[1] = 0;
h[2] = 0;
@ -375,7 +374,7 @@ Can get away with 11 carries, but then data flow is much deeper.
With tighter constraints on inputs can squeeze carries into int32.
*/
static void fe_mul(fe h, const fe f, const fe g) {
void fe_mul(fe h, const fe f, const fe g) {
int32_t f0 = f[0];
int32_t f1 = f[1];
int32_t f2 = f[2];

4
src/crypto/crypto-ops.h
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@ -30,6 +30,8 @@
#pragma once
#include <stdint.h>
/* From fe.h */
typedef int32_t fe[10];
@ -161,5 +163,7 @@ void ge_sub(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
void fe_add(fe h, const fe f, const fe g);
void fe_tobytes(unsigned char *, const fe);
void fe_invert(fe out, const fe z);
void fe_mul(fe out, const fe, const fe);
void fe_0(fe h);
int ge_p3_is_point_at_infinity_vartime(const ge_p3 *p);

8
src/crypto/crypto.h
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@ -335,8 +335,16 @@ namespace crypto {
inline bool operator<(const public_key &p1, const public_key &p2) { return memcmp(&p1, &p2, sizeof(public_key)) < 0; }
inline bool operator>(const public_key &p1, const public_key &p2) { return p2 < p1; }
inline bool operator<(const key_image &p1, const key_image &p2) { return memcmp(&p1, &p2, sizeof(key_image)) < 0; }
inline bool operator>(const key_image &p1, const key_image &p2) { return p2 < p1; }
}
// type conversions for easier calls to sc_add(), sc_sub(), hash functions
inline unsigned char* to_bytes(crypto::ec_scalar &scalar) { return &reinterpret_cast<unsigned char&>(scalar); }
inline const unsigned char* to_bytes(const crypto::ec_scalar &scalar) { return &reinterpret_cast<const unsigned char&>(scalar); }
inline unsigned char* to_bytes(crypto::ec_point &point) { return &reinterpret_cast<unsigned char&>(point); }
inline const unsigned char* to_bytes(const crypto::ec_point &point) { return &reinterpret_cast<const unsigned char&>(point); }
CRYPTO_MAKE_HASHABLE(public_key)
CRYPTO_MAKE_HASHABLE_CONSTANT_TIME(secret_key)
CRYPTO_MAKE_HASHABLE_CONSTANT_TIME(public_key_memsafe)

6
src/ringct/rctOps.cpp
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@ -671,7 +671,7 @@ namespace rct {
//Elliptic Curve Diffie Helman: encodes and decodes the amount b and mask a
// where C= aG + bH
static key ecdhHash(const key &k)
key genAmountEncodingFactor(const key &k)
{
char data[38];
rct::key hash;
@ -700,7 +700,7 @@ namespace rct {
if (v2)
{
unmasked.mask = zero();
xor8(unmasked.amount, ecdhHash(sharedSec));
xor8(unmasked.amount, genAmountEncodingFactor(sharedSec));
}
else
{
@ -715,7 +715,7 @@ namespace rct {
if (v2)
{
masked.mask = genCommitmentMask(sharedSec);
xor8(masked.amount, ecdhHash(sharedSec));
xor8(masked.amount, genAmountEncodingFactor(sharedSec));
}
else
{

1
src/ringct/rctOps.h
View File

@ -184,6 +184,7 @@ namespace rct {
//Elliptic Curve Diffie Helman: encodes and decodes the amount b and mask a
// where C= aG + bH
key genAmountEncodingFactor(const key &k);
key genCommitmentMask(const key &sk);
void ecdhEncode(ecdhTuple & unmasked, const key & sharedSec, bool v2);
void ecdhDecode(ecdhTuple & masked, const key & sharedSec, bool v2);