initial/final commitHEADmaster

1 files changed, 684 insertions, 0 deletions

diff --git a/openssl-1.1.0h/crypto/ec/ec_mult.c b/openssl-1.1.0h/crypto/ec/ec_mult.c
new file mode 100644
index 0000000..b39777f
--- /dev/null
+++ b/openssl-1.1.0h/crypto/ec/ec_mult.c
@@ -0,0 +1,684 @@
+/*
+ * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * Portions of this software developed by SUN MICROSYSTEMS, INC.,
+ * and contributed to the OpenSSL project.
+ */
+
+#include <string.h>
+#include <openssl/err.h>
+
+#include "internal/cryptlib.h"
+#include "internal/bn_int.h"
+#include "ec_lcl.h"
+
+/*
+ * This file implements the wNAF-based interleaving multi-exponentiation method
+ * Formerly at:
+ *   http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller.html#multiexp
+ * You might now find it here:
+ *   http://link.springer.com/chapter/10.1007%2F3-540-45537-X_13
+ *   http://www.bmoeller.de/pdf/TI-01-08.multiexp.pdf
+ * For multiplication with precomputation, we use wNAF splitting, formerly at:
+ *   http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller.html#fastexp
+ */
+
+/* structure for precomputed multiples of the generator */
+struct ec_pre_comp_st {
+    const EC_GROUP *group;      /* parent EC_GROUP object */
+    size_t blocksize;           /* block size for wNAF splitting */
+    size_t numblocks;           /* max. number of blocks for which we have
+                                 * precomputation */
+    size_t w;                   /* window size */
+    EC_POINT **points;          /* array with pre-calculated multiples of
+                                 * generator: 'num' pointers to EC_POINT
+                                 * objects followed by a NULL */
+    size_t num;                 /* numblocks * 2^(w-1) */
+    int references;
+    CRYPTO_RWLOCK *lock;
+};
+
+static EC_PRE_COMP *ec_pre_comp_new(const EC_GROUP *group)
+{
+    EC_PRE_COMP *ret = NULL;
+
+    if (!group)
+        return NULL;
+
+    ret = OPENSSL_zalloc(sizeof(*ret));
+    if (ret == NULL) {
+        ECerr(EC_F_EC_PRE_COMP_NEW, ERR_R_MALLOC_FAILURE);
+        return ret;
+    }
+
+    ret->group = group;
+    ret->blocksize = 8;         /* default */
+    ret->w = 4;                 /* default */
+    ret->references = 1;
+
+    ret->lock = CRYPTO_THREAD_lock_new();
+    if (ret->lock == NULL) {
+        ECerr(EC_F_EC_PRE_COMP_NEW, ERR_R_MALLOC_FAILURE);
+        OPENSSL_free(ret);
+        return NULL;
+    }
+    return ret;
+}
+
+EC_PRE_COMP *EC_ec_pre_comp_dup(EC_PRE_COMP *pre)
+{
+    int i;
+    if (pre != NULL)
+        CRYPTO_atomic_add(&pre->references, 1, &i, pre->lock);
+    return pre;
+}
+
+void EC_ec_pre_comp_free(EC_PRE_COMP *pre)
+{
+    int i;
+
+    if (pre == NULL)
+        return;
+
+    CRYPTO_atomic_add(&pre->references, -1, &i, pre->lock);
+    REF_PRINT_COUNT("EC_ec", pre);
+    if (i > 0)
+        return;
+    REF_ASSERT_ISNT(i < 0);
+
+    if (pre->points != NULL) {
+        EC_POINT **pts;
+
+        for (pts = pre->points; *pts != NULL; pts++)
+            EC_POINT_free(*pts);
+        OPENSSL_free(pre->points);
+    }
+    CRYPTO_THREAD_lock_free(pre->lock);
+    OPENSSL_free(pre);
+}
+
+/*
+ * TODO: table should be optimised for the wNAF-based implementation,
+ * sometimes smaller windows will give better performance (thus the
+ * boundaries should be increased)
+ */
+#define EC_window_bits_for_scalar_size(b) \
+                ((size_t) \
+                 ((b) >= 2000 ? 6 : \
+                  (b) >=  800 ? 5 : \
+                  (b) >=  300 ? 4 : \
+                  (b) >=   70 ? 3 : \
+                  (b) >=   20 ? 2 : \
+                  1))
+
+/*-
+ * Compute
+ *      \sum scalars[i]*points[i],
+ * also including
+ *      scalar*generator
+ * in the addition if scalar != NULL
+ */
+int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
+                size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
+                BN_CTX *ctx)
+{
+    BN_CTX *new_ctx = NULL;
+    const EC_POINT *generator = NULL;
+    EC_POINT *tmp = NULL;
+    size_t totalnum;
+    size_t blocksize = 0, numblocks = 0; /* for wNAF splitting */
+    size_t pre_points_per_block = 0;
+    size_t i, j;
+    int k;
+    int r_is_inverted = 0;
+    int r_is_at_infinity = 1;
+    size_t *wsize = NULL;       /* individual window sizes */
+    signed char **wNAF = NULL;  /* individual wNAFs */
+    size_t *wNAF_len = NULL;
+    size_t max_len = 0;
+    size_t num_val;
+    EC_POINT **val = NULL;      /* precomputation */
+    EC_POINT **v;
+    EC_POINT ***val_sub = NULL; /* pointers to sub-arrays of 'val' or
+                                 * 'pre_comp->points' */
+    const EC_PRE_COMP *pre_comp = NULL;
+    int num_scalar = 0;         /* flag: will be set to 1 if 'scalar' must be
+                                 * treated like other scalars, i.e.
+                                 * precomputation is not available */
+    int ret = 0;
+
+    if (group->meth != r->meth) {
+        ECerr(EC_F_EC_WNAF_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+
+    if ((scalar == NULL) && (num == 0)) {
+        return EC_POINT_set_to_infinity(group, r);
+    }
+
+    for (i = 0; i < num; i++) {
+        if (group->meth != points[i]->meth) {
+            ECerr(EC_F_EC_WNAF_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+            return 0;
+        }
+    }
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            goto err;
+    }
+
+    if (scalar != NULL) {
+        generator = EC_GROUP_get0_generator(group);
+        if (generator == NULL) {
+            ECerr(EC_F_EC_WNAF_MUL, EC_R_UNDEFINED_GENERATOR);
+            goto err;
+        }
+
+        /* look if we can use precomputed multiples of generator */
+
+        pre_comp = group->pre_comp.ec;
+        if (pre_comp && pre_comp->numblocks
+            && (EC_POINT_cmp(group, generator, pre_comp->points[0], ctx) ==
+                0)) {
+            blocksize = pre_comp->blocksize;
+
+            /*
+             * determine maximum number of blocks that wNAF splitting may
+             * yield (NB: maximum wNAF length is bit length plus one)
+             */
+            numblocks = (BN_num_bits(scalar) / blocksize) + 1;
+
+            /*
+             * we cannot use more blocks than we have precomputation for
+             */
+            if (numblocks > pre_comp->numblocks)
+                numblocks = pre_comp->numblocks;
+
+            pre_points_per_block = (size_t)1 << (pre_comp->w - 1);
+
+            /* check that pre_comp looks sane */
+            if (pre_comp->num != (pre_comp->numblocks * pre_points_per_block)) {
+                ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+        } else {
+            /* can't use precomputation */
+            pre_comp = NULL;
+            numblocks = 1;
+            num_scalar = 1;     /* treat 'scalar' like 'num'-th element of
+                                 * 'scalars' */
+        }
+    }
+
+    totalnum = num + numblocks;
+
+    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)
+        wNAF[0] = NULL;         /* preliminary pivot */
+
+    if (wsize == NULL || wNAF_len == NULL || wNAF == NULL || val_sub == NULL) {
+        ECerr(EC_F_EC_WNAF_MUL, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+
+    /*
+     * num_val will be the total number of temporarily precomputed points
+     */
+    num_val = 0;
+
+    for (i = 0; i < num + num_scalar; i++) {
+        size_t bits;
+
+        bits = i < num ? BN_num_bits(scalars[i]) : BN_num_bits(scalar);
+        wsize[i] = EC_window_bits_for_scalar_size(bits);
+        num_val += (size_t)1 << (wsize[i] - 1);
+        wNAF[i + 1] = NULL;     /* make sure we always have a pivot */
+        wNAF[i] =
+            bn_compute_wNAF((i < num ? scalars[i] : scalar), wsize[i],
+                            &wNAF_len[i]);
+        if (wNAF[i] == NULL)
+            goto err;
+        if (wNAF_len[i] > max_len)
+            max_len = wNAF_len[i];
+    }
+
+    if (numblocks) {
+        /* we go here iff scalar != NULL */
+
+        if (pre_comp == NULL) {
+            if (num_scalar != 1) {
+                ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+            /* we have already generated a wNAF for 'scalar' */
+        } else {
+            signed char *tmp_wNAF = NULL;
+            size_t tmp_len = 0;
+
+            if (num_scalar != 0) {
+                ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+
+            /*
+             * use the window size for which we have precomputation
+             */
+            wsize[num] = pre_comp->w;
+            tmp_wNAF = bn_compute_wNAF(scalar, wsize[num], &tmp_len);
+            if (!tmp_wNAF)
+                goto err;
+
+            if (tmp_len <= max_len) {
+                /*
+                 * One of the other wNAFs is at least as long as the wNAF
+                 * belonging to the generator, so wNAF splitting will not buy
+                 * us anything.
+                 */
+
+                numblocks = 1;
+                totalnum = num + 1; /* don't use wNAF splitting */
+                wNAF[num] = tmp_wNAF;
+                wNAF[num + 1] = NULL;
+                wNAF_len[num] = tmp_len;
+                /*
+                 * pre_comp->points starts with the points that we need here:
+                 */
+                val_sub[num] = pre_comp->points;
+            } else {
+                /*
+                 * don't include tmp_wNAF directly into wNAF array - use wNAF
+                 * splitting and include the blocks
+                 */
+
+                signed char *pp;
+                EC_POINT **tmp_points;
+
+                if (tmp_len < numblocks * blocksize) {
+                    /*
+                     * possibly we can do with fewer blocks than estimated
+                     */
+                    numblocks = (tmp_len + blocksize - 1) / blocksize;
+                    if (numblocks > pre_comp->numblocks) {
+                        ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                        OPENSSL_free(tmp_wNAF);
+                        goto err;
+                    }
+                    totalnum = num + numblocks;
+                }
+
+                /* split wNAF in 'numblocks' parts */
+                pp = tmp_wNAF;
+                tmp_points = pre_comp->points;
+
+                for (i = num; i < totalnum; i++) {
+                    if (i < totalnum - 1) {
+                        wNAF_len[i] = blocksize;
+                        if (tmp_len < blocksize) {
+                            ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                            OPENSSL_free(tmp_wNAF);
+                            goto err;
+                        }
+                        tmp_len -= blocksize;
+                    } else
+                        /*
+                         * last block gets whatever is left (this could be
+                         * more or less than 'blocksize'!)
+                         */
+                        wNAF_len[i] = tmp_len;
+
+                    wNAF[i + 1] = NULL;
+                    wNAF[i] = OPENSSL_malloc(wNAF_len[i]);
+                    if (wNAF[i] == NULL) {
+                        ECerr(EC_F_EC_WNAF_MUL, ERR_R_MALLOC_FAILURE);
+                        OPENSSL_free(tmp_wNAF);
+                        goto err;
+                    }
+                    memcpy(wNAF[i], pp, wNAF_len[i]);
+                    if (wNAF_len[i] > max_len)
+                        max_len = wNAF_len[i];
+
+                    if (*tmp_points == NULL) {
+                        ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+                        OPENSSL_free(tmp_wNAF);
+                        goto err;
+                    }
+                    val_sub[i] = tmp_points;
+                    tmp_points += pre_points_per_block;
+                    pp += blocksize;
+                }
+                OPENSSL_free(tmp_wNAF);
+            }
+        }
+    }
+
+    /*
+     * All points we precompute now go into a single array 'val'.
+     * '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]));
+    if (val == NULL) {
+        ECerr(EC_F_EC_WNAF_MUL, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    val[num_val] = NULL;        /* pivot element */
+
+    /* allocate points for precomputation */
+    v = val;
+    for (i = 0; i < num + num_scalar; i++) {
+        val_sub[i] = v;
+        for (j = 0; j < ((size_t)1 << (wsize[i] - 1)); j++) {
+            *v = EC_POINT_new(group);
+            if (*v == NULL)
+                goto err;
+            v++;
+        }
+    }
+    if (!(v == val + num_val)) {
+        ECerr(EC_F_EC_WNAF_MUL, ERR_R_INTERNAL_ERROR);
+        goto err;
+    }
+
+    if ((tmp = EC_POINT_new(group)) == NULL)
+        goto err;
+
+    /*-
+     * prepare precomputed values:
+     *    val_sub[i][0] :=     points[i]
+     *    val_sub[i][1] := 3 * points[i]
+     *    val_sub[i][2] := 5 * points[i]
+     *    ...
+     */
+    for (i = 0; i < num + num_scalar; i++) {
+        if (i < num) {
+            if (!EC_POINT_copy(val_sub[i][0], points[i]))
+                goto err;
+        } else {
+            if (!EC_POINT_copy(val_sub[i][0], generator))
+                goto err;
+        }
+
+        if (wsize[i] > 1) {
+            if (!EC_POINT_dbl(group, tmp, val_sub[i][0], ctx))
+                goto err;
+            for (j = 1; j < ((size_t)1 << (wsize[i] - 1)); j++) {
+                if (!EC_POINT_add
+                    (group, val_sub[i][j], val_sub[i][j - 1], tmp, ctx))
+                    goto err;
+            }
+        }
+    }
+
+    if (!EC_POINTs_make_affine(group, num_val, val, ctx))
+        goto err;
+
+    r_is_at_infinity = 1;
+
+    for (k = max_len - 1; k >= 0; k--) {
+        if (!r_is_at_infinity) {
+            if (!EC_POINT_dbl(group, r, r, ctx))
+                goto err;
+        }
+
+        for (i = 0; i < totalnum; i++) {
+            if (wNAF_len[i] > (size_t)k) {
+                int digit = wNAF[i][k];
+                int is_neg;
+
+                if (digit) {
+                    is_neg = digit < 0;
+
+                    if (is_neg)
+                        digit = -digit;
+
+                    if (is_neg != r_is_inverted) {
+                        if (!r_is_at_infinity) {
+                            if (!EC_POINT_invert(group, r, ctx))
+                                goto err;
+                        }
+                        r_is_inverted = !r_is_inverted;
+                    }
+
+                    /* digit > 0 */
+
+                    if (r_is_at_infinity) {
+                        if (!EC_POINT_copy(r, val_sub[i][digit >> 1]))
+                            goto err;
+                        r_is_at_infinity = 0;
+                    } else {
+                        if (!EC_POINT_add
+                            (group, r, r, val_sub[i][digit >> 1], ctx))
+                            goto err;
+                    }
+                }
+            }
+        }
+    }
+
+    if (r_is_at_infinity) {
+        if (!EC_POINT_set_to_infinity(group, r))
+            goto err;
+    } else {
+        if (r_is_inverted)
+            if (!EC_POINT_invert(group, r, ctx))
+                goto err;
+    }
+
+    ret = 1;
+
+ err:
+    BN_CTX_free(new_ctx);
+    EC_POINT_free(tmp);
+    OPENSSL_free(wsize);
+    OPENSSL_free(wNAF_len);
+    if (wNAF != NULL) {
+        signed char **w;
+
+        for (w = wNAF; *w != NULL; w++)
+            OPENSSL_free(*w);
+
+        OPENSSL_free(wNAF);
+    }
+    if (val != NULL) {
+        for (v = val; *v != NULL; v++)
+            EC_POINT_clear_free(*v);
+
+        OPENSSL_free(val);
+    }
+    OPENSSL_free(val_sub);
+    return ret;
+}
+
+/*-
+ * ec_wNAF_precompute_mult()
+ * creates an EC_PRE_COMP object with preprecomputed multiples of the generator
+ * for use with wNAF splitting as implemented in ec_wNAF_mul().
+ *
+ * 'pre_comp->points' is an array of multiples of the generator
+ * of the following form:
+ * points[0] =     generator;
+ * points[1] = 3 * generator;
+ * ...
+ * points[2^(w-1)-1] =     (2^(w-1)-1) * generator;
+ * points[2^(w-1)]   =     2^blocksize * generator;
+ * points[2^(w-1)+1] = 3 * 2^blocksize * generator;
+ * ...
+ * points[2^(w-1)*(numblocks-1)-1] = (2^(w-1)) *  2^(blocksize*(numblocks-2)) * generator
+ * points[2^(w-1)*(numblocks-1)]   =              2^(blocksize*(numblocks-1)) * generator
+ * ...
+ * points[2^(w-1)*numblocks-1]     = (2^(w-1)) *  2^(blocksize*(numblocks-1)) * generator
+ * points[2^(w-1)*numblocks]       = NULL
+ */
+int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
+{
+    const EC_POINT *generator;
+    EC_POINT *tmp_point = NULL, *base = NULL, **var;
+    BN_CTX *new_ctx = NULL;
+    const BIGNUM *order;
+    size_t i, bits, w, pre_points_per_block, blocksize, numblocks, num;
+    EC_POINT **points = NULL;
+    EC_PRE_COMP *pre_comp;
+    int ret = 0;
+
+    /* if there is an old EC_PRE_COMP object, throw it away */
+    EC_pre_comp_free(group);
+    if ((pre_comp = ec_pre_comp_new(group)) == NULL)
+        return 0;
+
+    generator = EC_GROUP_get0_generator(group);
+    if (generator == NULL) {
+        ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, EC_R_UNDEFINED_GENERATOR);
+        goto err;
+    }
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            goto err;
+    }
+
+    BN_CTX_start(ctx);
+
+    order = EC_GROUP_get0_order(group);
+    if (order == NULL)
+        goto err;
+    if (BN_is_zero(order)) {
+        ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, EC_R_UNKNOWN_ORDER);
+        goto err;
+    }
+
+    bits = BN_num_bits(order);
+    /*
+     * The following parameters mean we precompute (approximately) one point
+     * per bit. TBD: The combination 8, 4 is perfect for 160 bits; for other
+     * bit lengths, other parameter combinations might provide better
+     * efficiency.
+     */
+    blocksize = 8;
+    w = 4;
+    if (EC_window_bits_for_scalar_size(bits) > w) {
+        /* let's not make the window too small ... */
+        w = EC_window_bits_for_scalar_size(bits);
+    }
+
+    numblocks = (bits + blocksize - 1) / blocksize; /* max. number of blocks
+                                                     * to use for wNAF
+                                                     * splitting */
+
+    pre_points_per_block = (size_t)1 << (w - 1);
+    num = pre_points_per_block * numblocks; /* number of points to compute
+                                             * and store */
+
+    points = OPENSSL_malloc(sizeof(*points) * (num + 1));
+    if (points == NULL) {
+        ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+
+    var = points;
+    var[num] = NULL;            /* pivot */
+    for (i = 0; i < num; i++) {
+        if ((var[i] = EC_POINT_new(group)) == NULL) {
+            ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+    }
+
+    if ((tmp_point = EC_POINT_new(group)) == NULL
+        || (base = EC_POINT_new(group)) == NULL) {
+        ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+
+    if (!EC_POINT_copy(base, generator))
+        goto err;
+
+    /* do the precomputation */
+    for (i = 0; i < numblocks; i++) {
+        size_t j;
+
+        if (!EC_POINT_dbl(group, tmp_point, base, ctx))
+            goto err;
+
+        if (!EC_POINT_copy(*var++, base))
+            goto err;
+
+        for (j = 1; j < pre_points_per_block; j++, var++) {
+            /*
+             * calculate odd multiples of the current base point
+             */
+            if (!EC_POINT_add(group, *var, tmp_point, *(var - 1), ctx))
+                goto err;
+        }
+
+        if (i < numblocks - 1) {
+            /*
+             * get the next base (multiply current one by 2^blocksize)
+             */
+            size_t k;
+
+            if (blocksize <= 2) {
+                ECerr(EC_F_EC_WNAF_PRECOMPUTE_MULT, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+
+            if (!EC_POINT_dbl(group, base, tmp_point, ctx))
+                goto err;
+            for (k = 2; k < blocksize; k++) {
+                if (!EC_POINT_dbl(group, base, base, ctx))
+                    goto err;
+            }
+        }
+    }
+
+    if (!EC_POINTs_make_affine(group, num, points, ctx))
+        goto err;
+
+    pre_comp->group = group;
+    pre_comp->blocksize = blocksize;
+    pre_comp->numblocks = numblocks;
+    pre_comp->w = w;
+    pre_comp->points = points;
+    points = NULL;
+    pre_comp->num = num;
+    SETPRECOMP(group, ec, pre_comp);
+    pre_comp = NULL;
+    ret = 1;
+
+ err:
+    if (ctx != NULL)
+        BN_CTX_end(ctx);
+    BN_CTX_free(new_ctx);
+    EC_ec_pre_comp_free(pre_comp);
+    if (points) {
+        EC_POINT **p;
+
+        for (p = points; *p != NULL; p++)
+            EC_POINT_free(*p);
+        OPENSSL_free(points);
+    }
+    EC_POINT_free(tmp_point);
+    EC_POINT_free(base);
+    return ret;
+}
+
+int ec_wNAF_have_precompute_mult(const EC_GROUP *group)
+{
+    return HAVEPRECOMP(group, ec);
+}