219 lines
9.6 KiB
C
219 lines
9.6 KiB
C
/* crypto/ec/ecp_nistputil.c */
|
|
/*
|
|
* Written by Bodo Moeller for the OpenSSL project.
|
|
*/
|
|
/* Copyright 2011 Google Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
*
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <openssl/opensslconf.h>
|
|
#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
|
|
|
|
/*
|
|
* Common utility functions for ecp_nistp224.c, ecp_nistp256.c, ecp_nistp521.c.
|
|
*/
|
|
|
|
# include <stddef.h>
|
|
# include "ec_lcl.h"
|
|
|
|
/*
|
|
* Convert an array of points into affine coordinates. (If the point at
|
|
* infinity is found (Z = 0), it remains unchanged.) This function is
|
|
* essentially an equivalent to EC_POINTs_make_affine(), but works with the
|
|
* internal representation of points as used by ecp_nistp###.c rather than
|
|
* with (BIGNUM-based) EC_POINT data structures. point_array is the
|
|
* input/output buffer ('num' points in projective form, i.e. three
|
|
* coordinates each), based on an internal representation of field elements
|
|
* of size 'felem_size'. tmp_felems needs to point to a temporary array of
|
|
* 'num'+1 field elements for storage of intermediate values.
|
|
*/
|
|
void ec_GFp_nistp_points_make_affine_internal(size_t num, void *point_array,
|
|
size_t felem_size,
|
|
void *tmp_felems,
|
|
void (*felem_one) (void *out),
|
|
int (*felem_is_zero) (const void
|
|
*in),
|
|
void (*felem_assign) (void *out,
|
|
const void
|
|
*in),
|
|
void (*felem_square) (void *out,
|
|
const void
|
|
*in),
|
|
void (*felem_mul) (void *out,
|
|
const void
|
|
*in1,
|
|
const void
|
|
*in2),
|
|
void (*felem_inv) (void *out,
|
|
const void
|
|
*in),
|
|
void (*felem_contract) (void
|
|
*out,
|
|
const
|
|
void
|
|
*in))
|
|
{
|
|
int i = 0;
|
|
|
|
# define tmp_felem(I) (&((char *)tmp_felems)[(I) * felem_size])
|
|
# define X(I) (&((char *)point_array)[3*(I) * felem_size])
|
|
# define Y(I) (&((char *)point_array)[(3*(I) + 1) * felem_size])
|
|
# define Z(I) (&((char *)point_array)[(3*(I) + 2) * felem_size])
|
|
|
|
if (!felem_is_zero(Z(0)))
|
|
felem_assign(tmp_felem(0), Z(0));
|
|
else
|
|
felem_one(tmp_felem(0));
|
|
for (i = 1; i < (int)num; i++) {
|
|
if (!felem_is_zero(Z(i)))
|
|
felem_mul(tmp_felem(i), tmp_felem(i - 1), Z(i));
|
|
else
|
|
felem_assign(tmp_felem(i), tmp_felem(i - 1));
|
|
}
|
|
/*
|
|
* Now each tmp_felem(i) is the product of Z(0) .. Z(i), skipping any
|
|
* zero-valued factors: if Z(i) = 0, we essentially pretend that Z(i) = 1
|
|
*/
|
|
|
|
felem_inv(tmp_felem(num - 1), tmp_felem(num - 1));
|
|
for (i = num - 1; i >= 0; i--) {
|
|
if (i > 0)
|
|
/*
|
|
* tmp_felem(i-1) is the product of Z(0) .. Z(i-1), tmp_felem(i)
|
|
* is the inverse of the product of Z(0) .. Z(i)
|
|
*/
|
|
/* 1/Z(i) */
|
|
felem_mul(tmp_felem(num), tmp_felem(i - 1), tmp_felem(i));
|
|
else
|
|
felem_assign(tmp_felem(num), tmp_felem(0)); /* 1/Z(0) */
|
|
|
|
if (!felem_is_zero(Z(i))) {
|
|
if (i > 0)
|
|
/*
|
|
* For next iteration, replace tmp_felem(i-1) by its inverse
|
|
*/
|
|
felem_mul(tmp_felem(i - 1), tmp_felem(i), Z(i));
|
|
|
|
/*
|
|
* Convert point (X, Y, Z) into affine form (X/(Z^2), Y/(Z^3), 1)
|
|
*/
|
|
felem_square(Z(i), tmp_felem(num)); /* 1/(Z^2) */
|
|
felem_mul(X(i), X(i), Z(i)); /* X/(Z^2) */
|
|
felem_mul(Z(i), Z(i), tmp_felem(num)); /* 1/(Z^3) */
|
|
felem_mul(Y(i), Y(i), Z(i)); /* Y/(Z^3) */
|
|
felem_contract(X(i), X(i));
|
|
felem_contract(Y(i), Y(i));
|
|
felem_one(Z(i));
|
|
} else {
|
|
if (i > 0)
|
|
/*
|
|
* For next iteration, replace tmp_felem(i-1) by its inverse
|
|
*/
|
|
felem_assign(tmp_felem(i - 1), tmp_felem(i));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*-
|
|
* This function looks at 5+1 scalar bits (5 current, 1 adjacent less
|
|
* significant bit), and recodes them into a signed digit for use in fast point
|
|
* multiplication: the use of signed rather than unsigned digits means that
|
|
* fewer points need to be precomputed, given that point inversion is easy
|
|
* (a precomputed point dP makes -dP available as well).
|
|
*
|
|
* BACKGROUND:
|
|
*
|
|
* Signed digits for multiplication were introduced by Booth ("A signed binary
|
|
* multiplication technique", Quart. Journ. Mech. and Applied Math., vol. IV,
|
|
* pt. 2 (1951), pp. 236-240), in that case for multiplication of integers.
|
|
* Booth's original encoding did not generally improve the density of nonzero
|
|
* digits over the binary representation, and was merely meant to simplify the
|
|
* handling of signed factors given in two's complement; but it has since been
|
|
* shown to be the basis of various signed-digit representations that do have
|
|
* further advantages, including the wNAF, using the following general approach:
|
|
*
|
|
* (1) Given a binary representation
|
|
*
|
|
* b_k ... b_2 b_1 b_0,
|
|
*
|
|
* of a nonnegative integer (b_k in {0, 1}), rewrite it in digits 0, 1, -1
|
|
* by using bit-wise subtraction as follows:
|
|
*
|
|
* b_k b_(k-1) ... b_2 b_1 b_0
|
|
* - b_k ... b_3 b_2 b_1 b_0
|
|
* -------------------------------------
|
|
* s_k b_(k-1) ... s_3 s_2 s_1 s_0
|
|
*
|
|
* A left-shift followed by subtraction of the original value yields a new
|
|
* representation of the same value, using signed bits s_i = b_(i+1) - b_i.
|
|
* This representation from Booth's paper has since appeared in the
|
|
* literature under a variety of different names including "reversed binary
|
|
* form", "alternating greedy expansion", "mutual opposite form", and
|
|
* "sign-alternating {+-1}-representation".
|
|
*
|
|
* An interesting property is that among the nonzero bits, values 1 and -1
|
|
* strictly alternate.
|
|
*
|
|
* (2) Various window schemes can be applied to the Booth representation of
|
|
* integers: for example, right-to-left sliding windows yield the wNAF
|
|
* (a signed-digit encoding independently discovered by various researchers
|
|
* in the 1990s), and left-to-right sliding windows yield a left-to-right
|
|
* equivalent of the wNAF (independently discovered by various researchers
|
|
* around 2004).
|
|
*
|
|
* To prevent leaking information through side channels in point multiplication,
|
|
* we need to recode the given integer into a regular pattern: sliding windows
|
|
* as in wNAFs won't do, we need their fixed-window equivalent -- which is a few
|
|
* decades older: we'll be using the so-called "modified Booth encoding" due to
|
|
* MacSorley ("High-speed arithmetic in binary computers", Proc. IRE, vol. 49
|
|
* (1961), pp. 67-91), in a radix-2^5 setting. That is, we always combine five
|
|
* signed bits into a signed digit:
|
|
*
|
|
* s_(4j + 4) s_(4j + 3) s_(4j + 2) s_(4j + 1) s_(4j)
|
|
*
|
|
* The sign-alternating property implies that the resulting digit values are
|
|
* integers from -16 to 16.
|
|
*
|
|
* Of course, we don't actually need to compute the signed digits s_i as an
|
|
* intermediate step (that's just a nice way to see how this scheme relates
|
|
* to the wNAF): a direct computation obtains the recoded digit from the
|
|
* six bits b_(4j + 4) ... b_(4j - 1).
|
|
*
|
|
* This function takes those five bits as an integer (0 .. 63), writing the
|
|
* recoded digit to *sign (0 for positive, 1 for negative) and *digit (absolute
|
|
* value, in the range 0 .. 8). Note that this integer essentially provides the
|
|
* input bits "shifted to the left" by one position: for example, the input to
|
|
* compute the least significant recoded digit, given that there's no bit b_-1,
|
|
* has to be b_4 b_3 b_2 b_1 b_0 0.
|
|
*
|
|
*/
|
|
void ec_GFp_nistp_recode_scalar_bits(unsigned char *sign,
|
|
unsigned char *digit, unsigned char in)
|
|
{
|
|
unsigned char s, d;
|
|
|
|
s = ~((in >> 5) - 1); /* sets all bits to MSB(in), 'in' seen as
|
|
* 6-bit value */
|
|
d = (1 << 6) - in - 1;
|
|
d = (d & s) | (in & ~s);
|
|
d = (d >> 1) + (d & 1);
|
|
|
|
*sign = s & 1;
|
|
*digit = d;
|
|
}
|
|
#else
|
|
static void *dummy = &dummy;
|
|
#endif
|