/*
- * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
*
* Licensed under the OpenSSL license (the "License"). You may not use
OPENSSL_free(pre);
}
+#define EC_POINT_BN_set_flags(P, flags) do { \
+ BN_set_flags((P)->X, (flags)); \
+ BN_set_flags((P)->Y, (flags)); \
+ BN_set_flags((P)->Z, (flags)); \
+} while(0)
+
+/*-
+ * This functions computes (in constant time) a point multiplication over the
+ * EC group.
+ *
+ * At a high level, it is Montgomery ladder with conditional swaps.
+ *
+ * It performs either a fixed point multiplication
+ * (scalar * generator)
+ * when point is NULL, or a variable point multiplication
+ * (scalar * point)
+ * when point is not NULL.
+ *
+ * scalar should be in the range [0,n) otherwise all constant time bets are off.
+ *
+ * NB: This says nothing about EC_POINT_add and EC_POINT_dbl,
+ * which of course are not constant time themselves.
+ *
+ * The product is stored in r.
+ *
+ * Returns 1 on success, 0 otherwise.
+ */
+static int ec_mul_consttime(const EC_GROUP *group, EC_POINT *r,
+ const BIGNUM *scalar, const EC_POINT *point,
+ BN_CTX *ctx)
+{
+ int i, order_bits, group_top, kbit, pbit, Z_is_one;
+ EC_POINT *s = NULL;
+ BIGNUM *k = NULL;
+ BIGNUM *lambda = NULL;
+ BN_CTX *new_ctx = NULL;
+ int ret = 0;
+
+ if (ctx == NULL && (ctx = new_ctx = BN_CTX_secure_new()) == NULL)
+ return 0;
+
+ BN_CTX_start(ctx);
+
+ order_bits = BN_num_bits(group->order);
+
+ s = EC_POINT_new(group);
+ if (s == NULL)
+ goto err;
+
+ if (point == NULL) {
+ if (!EC_POINT_copy(s, group->generator))
+ goto err;
+ } else {
+ if (!EC_POINT_copy(s, point))
+ goto err;
+ }
+
+ EC_POINT_BN_set_flags(s, BN_FLG_CONSTTIME);
+
+ lambda = BN_CTX_get(ctx);
+ k = BN_CTX_get(ctx);
+ if (k == NULL)
+ goto err;
+
+ /*
+ * Group orders are often on a word boundary.
+ * So when we pad the scalar, some timing diff might
+ * pop if it needs to be expanded due to carries.
+ * So expand ahead of time.
+ */
+ group_top = bn_get_top(group->order);
+ if ((bn_wexpand(k, group_top + 1) == NULL)
+ || (bn_wexpand(lambda, group_top + 1) == NULL))
+ goto err;
+
+ if (!BN_copy(k, scalar))
+ goto err;
+
+ BN_set_flags(k, BN_FLG_CONSTTIME);
+
+ if ((BN_num_bits(k) > order_bits) || (BN_is_negative(k))) {
+ /*-
+ * this is an unusual input, and we don't guarantee
+ * constant-timeness
+ */
+ if (!BN_nnmod(k, k, group->order, ctx))
+ goto err;
+ }
+
+ if (!BN_add(lambda, k, group->order))
+ goto err;
+ BN_set_flags(lambda, BN_FLG_CONSTTIME);
+ if (!BN_add(k, lambda, group->order))
+ goto err;
+ /*
+ * lambda := scalar + order
+ * k := scalar + 2*order
+ */
+ kbit = BN_is_bit_set(lambda, order_bits);
+ BN_consttime_swap(kbit, k, lambda, group_top + 1);
+
+ group_top = bn_get_top(group->field);
+ if ((bn_wexpand(s->X, group_top) == NULL)
+ || (bn_wexpand(s->Y, group_top) == NULL)
+ || (bn_wexpand(s->Z, group_top) == NULL)
+ || (bn_wexpand(r->X, group_top) == NULL)
+ || (bn_wexpand(r->Y, group_top) == NULL)
+ || (bn_wexpand(r->Z, group_top) == NULL))
+ goto err;
+
+ /* top bit is a 1, in a fixed pos */
+ if (!EC_POINT_copy(r, s))
+ goto err;
+
+ EC_POINT_BN_set_flags(r, BN_FLG_CONSTTIME);
+
+ if (!EC_POINT_dbl(group, s, s, ctx))
+ goto err;
+
+ pbit = 0;
+
+#define EC_POINT_CSWAP(c, a, b, w, t) do { \
+ BN_consttime_swap(c, (a)->X, (b)->X, w); \
+ BN_consttime_swap(c, (a)->Y, (b)->Y, w); \
+ BN_consttime_swap(c, (a)->Z, (b)->Z, w); \
+ t = ((a)->Z_is_one ^ (b)->Z_is_one) & (c); \
+ (a)->Z_is_one ^= (t); \
+ (b)->Z_is_one ^= (t); \
+} while(0)
+
+ /*-
+ * The ladder step, with branches, is
+ *
+ * k[i] == 0: S = add(R, S), R = dbl(R)
+ * k[i] == 1: R = add(S, R), S = dbl(S)
+ *
+ * Swapping R, S conditionally on k[i] leaves you with state
+ *
+ * k[i] == 0: T, U = R, S
+ * k[i] == 1: T, U = S, R
+ *
+ * Then perform the ECC ops.
+ *
+ * U = add(T, U)
+ * T = dbl(T)
+ *
+ * Which leaves you with state
+ *
+ * k[i] == 0: U = add(R, S), T = dbl(R)
+ * k[i] == 1: U = add(S, R), T = dbl(S)
+ *
+ * Swapping T, U conditionally on k[i] leaves you with state
+ *
+ * k[i] == 0: R, S = T, U
+ * k[i] == 1: R, S = U, T
+ *
+ * Which leaves you with state
+ *
+ * k[i] == 0: S = add(R, S), R = dbl(R)
+ * k[i] == 1: R = add(S, R), S = dbl(S)
+ *
+ * So we get the same logic, but instead of a branch it's a
+ * conditional swap, followed by ECC ops, then another conditional swap.
+ *
+ * Optimization: The end of iteration i and start of i-1 looks like
+ *
+ * ...
+ * CSWAP(k[i], R, S)
+ * ECC
+ * CSWAP(k[i], R, S)
+ * (next iteration)
+ * CSWAP(k[i-1], R, S)
+ * ECC
+ * CSWAP(k[i-1], R, S)
+ * ...
+ *
+ * So instead of two contiguous swaps, you can merge the condition
+ * bits and do a single swap.
+ *
+ * k[i] k[i-1] Outcome
+ * 0 0 No Swap
+ * 0 1 Swap
+ * 1 0 Swap
+ * 1 1 No Swap
+ *
+ * This is XOR. pbit tracks the previous bit of k.
+ */
+
+ for (i = order_bits - 1; i >= 0; i--) {
+ kbit = BN_is_bit_set(k, i) ^ pbit;
+ EC_POINT_CSWAP(kbit, r, s, group_top, Z_is_one);
+ if (!EC_POINT_add(group, s, r, s, ctx))
+ goto err;
+ if (!EC_POINT_dbl(group, r, r, ctx))
+ goto err;
+ /*
+ * pbit logic merges this cswap with that of the
+ * next iteration
+ */
+ pbit ^= kbit;
+ }
+ /* one final cswap to move the right value into r */
+ EC_POINT_CSWAP(pbit, r, s, group_top, Z_is_one);
+#undef EC_POINT_CSWAP
+
+ ret = 1;
+
+ err:
+ EC_POINT_free(s);
+ BN_CTX_end(ctx);
+ BN_CTX_free(new_ctx);
+
+ return ret;
+}
+
+#undef EC_POINT_BN_set_flags
+
/*
* TODO: table should be optimised for the wNAF-based implementation,
* sometimes smaller windows will give better performance (thus the
return EC_POINT_set_to_infinity(group, r);
}
+ /*-
+ * Handle the common cases where the scalar is secret, enforcing a constant
+ * time scalar multiplication algorithm.
+ */
+ if ((scalar != NULL) && (num == 0)) {
+ /*-
+ * In this case we want to compute scalar * GeneratorPoint: this
+ * codepath is reached most prominently by (ephemeral) key generation
+ * of EC cryptosystems (i.e. ECDSA keygen and sign setup, ECDH
+ * keygen/first half), where the scalar is always secret. This is why
+ * we ignore if BN_FLG_CONSTTIME is actually set and we always call the
+ * constant time version.
+ */
+ return ec_mul_consttime(group, r, scalar, NULL, ctx);
+ }
+ if ((scalar == NULL) && (num == 1)) {
+ /*-
+ * In this case we want to compute scalar * GenericPoint: this codepath
+ * is reached most prominently by the second half of ECDH, where the
+ * secret scalar is multiplied by the peer's public point. To protect
+ * the secret scalar, we ignore if BN_FLG_CONSTTIME is actually set and
+ * we always call the constant time version.
+ */
+ return ec_mul_consttime(group, r, scalars[0], points[0], ctx);
+ }
+
for (i = 0; i < num; i++) {
if (group->meth != points[i]->meth) {
ECerr(EC_F_EC_WNAF_MUL, EC_R_INCOMPATIBLE_OBJECTS);
totalnum = num + numblocks;
- wsize = OPENSSL_malloc(totalnum * sizeof wsize[0]);
- wNAF_len = OPENSSL_malloc(totalnum * sizeof wNAF_len[0]);
- wNAF = OPENSSL_malloc((totalnum + 1) * sizeof wNAF[0]); /* includes space
- * for pivot */
- val_sub = OPENSSL_malloc(totalnum * sizeof val_sub[0]);
+ wsize = OPENSSL_malloc(totalnum * sizeof(wsize[0]));
+ wNAF_len = OPENSSL_malloc(totalnum * sizeof(wNAF_len[0]));
+ /* include space for pivot */
+ wNAF = OPENSSL_malloc((totalnum + 1) * sizeof(wNAF[0]));
+ val_sub = OPENSSL_malloc(totalnum * sizeof(val_sub[0]));
/* Ensure wNAF is initialised in case we end up going to err */
if (wNAF != NULL)
* 'val_sub[i]' is a pointer to the subarray for the i-th point, or to a
* subarray of 'pre_comp->points' if we already have precomputation.
*/
- val = OPENSSL_malloc((num_val + 1) * sizeof val[0]);
+ val = OPENSSL_malloc((num_val + 1) * sizeof(val[0]));
if (val == NULL) {
ECerr(EC_F_EC_WNAF_MUL, ERR_R_MALLOC_FAILURE);
goto err;
projects / openssl.git / blobdiff