Update openssl to version openssl-1.0.1m

Conflicts:
	openssl/Makefile
	openssl/Makefile.bak
	openssl/crypto/cryptlib.c

1 files changed, 772 insertions, 800 deletions

diff --git a/openssl/crypto/ec/ec_mult.c b/openssl/crypto/ec/ec_mult.c
index e81200b25..23b8c3089 100644
--- a/openssl/crypto/ec/ec_mult.c
+++ b/openssl/crypto/ec/ec_mult.c
@@ -10,7 +10,7 @@
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer. 
+ *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
@@ -67,7 +67,6 @@
 
 #include "ec_lcl.h"
 
-
 /*
  * This file implements the wNAF-based interleaving multi-exponentation method
  * (<URL:http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller.html#multiexp>);
@@ -75,114 +74,107 @@
  * (<URL:http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller.html#fastexp>).
  */
 
-
-
-
 /* structure for precomputed multiples of the generator */
 typedef 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;
+    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;
 } EC_PRE_COMP;
- 
+
 /* functions to manage EC_PRE_COMP within the EC_GROUP extra_data framework */
 static void *ec_pre_comp_dup(void *);
 static void ec_pre_comp_free(void *);
 static void ec_pre_comp_clear_free(void *);
 
 static EC_PRE_COMP *ec_pre_comp_new(const EC_GROUP *group)
-	{
-	EC_PRE_COMP *ret = NULL;
-
-	if (!group)
-		return NULL;
-
-	ret = (EC_PRE_COMP *)OPENSSL_malloc(sizeof(EC_PRE_COMP));
-	if (!ret)
-		{
-		ECerr(EC_F_EC_PRE_COMP_NEW, ERR_R_MALLOC_FAILURE);
-		return ret;
-		}
-	ret->group = group;
-	ret->blocksize = 8; /* default */
-	ret->numblocks = 0;
-	ret->w = 4; /* default */
-	ret->points = NULL;
-	ret->num = 0;
-	ret->references = 1;
-	return ret;
-	}
+{
+    EC_PRE_COMP *ret = NULL;
+
+    if (!group)
+        return NULL;
+
+    ret = (EC_PRE_COMP *)OPENSSL_malloc(sizeof(EC_PRE_COMP));
+    if (!ret) {
+        ECerr(EC_F_EC_PRE_COMP_NEW, ERR_R_MALLOC_FAILURE);
+        return ret;
+    }
+    ret->group = group;
+    ret->blocksize = 8;         /* default */
+    ret->numblocks = 0;
+    ret->w = 4;                 /* default */
+    ret->points = NULL;
+    ret->num = 0;
+    ret->references = 1;
+    return ret;
+}
 
 static void *ec_pre_comp_dup(void *src_)
-	{
-	EC_PRE_COMP *src = src_;
+{
+    EC_PRE_COMP *src = src_;
 
-	/* no need to actually copy, these objects never change! */
+    /* no need to actually copy, these objects never change! */
 
-	CRYPTO_add(&src->references, 1, CRYPTO_LOCK_EC_PRE_COMP);
+    CRYPTO_add(&src->references, 1, CRYPTO_LOCK_EC_PRE_COMP);
 
-	return src_;
-	}
+    return src_;
+}
 
 static void ec_pre_comp_free(void *pre_)
-	{
-	int i;
-	EC_PRE_COMP *pre = pre_;
+{
+    int i;
+    EC_PRE_COMP *pre = pre_;
 
-	if (!pre)
-		return;
+    if (!pre)
+        return;
 
-	i = CRYPTO_add(&pre->references, -1, CRYPTO_LOCK_EC_PRE_COMP);
-	if (i > 0)
-		return;
+    i = CRYPTO_add(&pre->references, -1, CRYPTO_LOCK_EC_PRE_COMP);
+    if (i > 0)
+        return;
 
-	if (pre->points)
-		{
-		EC_POINT **p;
+    if (pre->points) {
+        EC_POINT **p;
 
-		for (p = pre->points; *p != NULL; p++)
-			EC_POINT_free(*p);
-		OPENSSL_free(pre->points);
-		}
-	OPENSSL_free(pre);
-	}
+        for (p = pre->points; *p != NULL; p++)
+            EC_POINT_free(*p);
+        OPENSSL_free(pre->points);
+    }
+    OPENSSL_free(pre);
+}
 
 static void ec_pre_comp_clear_free(void *pre_)
-	{
-	int i;
-	EC_PRE_COMP *pre = pre_;
-
-	if (!pre)
-		return;
-
-	i = CRYPTO_add(&pre->references, -1, CRYPTO_LOCK_EC_PRE_COMP);
-	if (i > 0)
-		return;
-
-	if (pre->points)
-		{
-		EC_POINT **p;
-
-		for (p = pre->points; *p != NULL; p++)
-			{
-			EC_POINT_clear_free(*p);
-			OPENSSL_cleanse(p, sizeof *p);
-			}
-		OPENSSL_free(pre->points);
-		}
-	OPENSSL_cleanse(pre, sizeof *pre);
-	OPENSSL_free(pre);
-	}
-
-
-
-
-/* Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
+{
+    int i;
+    EC_PRE_COMP *pre = pre_;
+
+    if (!pre)
+        return;
+
+    i = CRYPTO_add(&pre->references, -1, CRYPTO_LOCK_EC_PRE_COMP);
+    if (i > 0)
+        return;
+
+    if (pre->points) {
+        EC_POINT **p;
+
+        for (p = pre->points; *p != NULL; p++) {
+            EC_POINT_clear_free(*p);
+            OPENSSL_cleanse(p, sizeof *p);
+        }
+        OPENSSL_free(pre->points);
+    }
+    OPENSSL_cleanse(pre, sizeof *pre);
+    OPENSSL_free(pre);
+}
+
+/*-
+ * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
  * This is an array  r[]  of values that are either zero or odd with an
  * absolute value less than  2^w  satisfying
  *     scalar = \sum_j r[j]*2^j
@@ -191,563 +183,546 @@ static void ec_pre_comp_clear_free(void *pre_)
  * w-1 zeros away from that next non-zero digit.
  */
 static signed char *compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len)
-	{
-	int window_val;
-	int ok = 0;
-	signed char *r = NULL;
-	int sign = 1;
-	int bit, next_bit, mask;
-	size_t len = 0, j;
-	
-	if (BN_is_zero(scalar))
-		{
-		r = OPENSSL_malloc(1);
-		if (!r)
-			{
-			ECerr(EC_F_COMPUTE_WNAF, ERR_R_MALLOC_FAILURE);
-			goto err;
-			}
-		r[0] = 0;
-		*ret_len = 1;
-		return r;
-		}
-		
-	if (w <= 0 || w > 7) /* 'signed char' can represent integers with absolute values less than 2^7 */
-		{
-		ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-		goto err;
-		}
-	bit = 1 << w; /* at most 128 */
-	next_bit = bit << 1; /* at most 256 */
-	mask = next_bit - 1; /* at most 255 */
-
-	if (BN_is_negative(scalar))
-		{
-		sign = -1;
-		}
-
-	if (scalar->d == NULL || scalar->top == 0)
-		{
-		ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-		goto err;
-		}
-
-	len = BN_num_bits(scalar);
-	r = OPENSSL_malloc(len + 1); /* modified wNAF may be one digit longer than binary representation
-	                              * (*ret_len will be set to the actual length, i.e. at most
-	                              * BN_num_bits(scalar) + 1) */
-	if (r == NULL)
-		{
-		ECerr(EC_F_COMPUTE_WNAF, ERR_R_MALLOC_FAILURE);
-		goto err;
-		}
-	window_val = scalar->d[0] & mask;
-	j = 0;
-	while ((window_val != 0) || (j + w + 1 < len)) /* if j+w+1 >= len, window_val will not increase */
-		{
-		int digit = 0;
-
-		/* 0 <= window_val <= 2^(w+1) */
-
-		if (window_val & 1)
-			{
-			/* 0 < window_val < 2^(w+1) */
-
-			if (window_val & bit)
-				{
-				digit = window_val - next_bit; /* -2^w < digit < 0 */
-
-#if 1 /* modified wNAF */
-				if (j + w + 1 >= len)
-					{
-					/* special case for generating modified wNAFs:
-					 * no new bits will be added into window_val,
-					 * so using a positive digit here will decrease
-					 * the total length of the representation */
-					
-					digit = window_val & (mask >> 1); /* 0 < digit < 2^w */
-					}
+{
+    int window_val;
+    int ok = 0;
+    signed char *r = NULL;
+    int sign = 1;
+    int bit, next_bit, mask;
+    size_t len = 0, j;
+
+    if (BN_is_zero(scalar)) {
+        r = OPENSSL_malloc(1);
+        if (!r) {
+            ECerr(EC_F_COMPUTE_WNAF, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+        r[0] = 0;
+        *ret_len = 1;
+        return r;
+    }
+
+    if (w <= 0 || w > 7) {      /* 'signed char' can represent integers with
+                                 * absolute values less than 2^7 */
+        ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+        goto err;
+    }
+    bit = 1 << w;               /* at most 128 */
+    next_bit = bit << 1;        /* at most 256 */
+    mask = next_bit - 1;        /* at most 255 */
+
+    if (BN_is_negative(scalar)) {
+        sign = -1;
+    }
+
+    if (scalar->d == NULL || scalar->top == 0) {
+        ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+        goto err;
+    }
+
+    len = BN_num_bits(scalar);
+    r = OPENSSL_malloc(len + 1); /* modified wNAF may be one digit longer
+                                  * than binary representation (*ret_len will
+                                  * be set to the actual length, i.e. at most
+                                  * BN_num_bits(scalar) + 1) */
+    if (r == NULL) {
+        ECerr(EC_F_COMPUTE_WNAF, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    window_val = scalar->d[0] & mask;
+    j = 0;
+    while ((window_val != 0) || (j + w + 1 < len)) { /* if j+w+1 >= len,
+                                                      * window_val will not
+                                                      * increase */
+        int digit = 0;
+
+        /* 0 <= window_val <= 2^(w+1) */
+
+        if (window_val & 1) {
+            /* 0 < window_val < 2^(w+1) */
+
+            if (window_val & bit) {
+                digit = window_val - next_bit; /* -2^w < digit < 0 */
+
+#if 1                           /* modified wNAF */
+                if (j + w + 1 >= len) {
+                    /*
+                     * special case for generating modified wNAFs: no new
+                     * bits will be added into window_val, so using a
+                     * positive digit here will decrease the total length of
+                     * the representation
+                     */
+
+                    digit = window_val & (mask >> 1); /* 0 < digit < 2^w */
+                }
 #endif
-				}
-			else
-				{
-				digit = window_val; /* 0 < digit < 2^w */
-				}
-			
-			if (digit <= -bit || digit >= bit || !(digit & 1))
-				{
-				ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-				goto err;
-				}
-
-			window_val -= digit;
-
-			/* now window_val is 0 or 2^(w+1) in standard wNAF generation;
-			 * for modified window NAFs, it may also be 2^w
-			 */
-			if (window_val != 0 && window_val != next_bit && window_val != bit)
-				{
-				ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-				goto err;
-				}
-			}
-
-		r[j++] = sign * digit;
-
-		window_val >>= 1;
-		window_val += bit * BN_is_bit_set(scalar, j + w);
-
-		if (window_val > next_bit)
-			{
-			ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-			goto err;
-			}
-		}
-
-	if (j > len + 1)
-		{
-		ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
-		goto err;
-		}
-	len = j;
-	ok = 1;
+            } else {
+                digit = window_val; /* 0 < digit < 2^w */
+            }
+
+            if (digit <= -bit || digit >= bit || !(digit & 1)) {
+                ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+
+            window_val -= digit;
+
+            /*
+             * now window_val is 0 or 2^(w+1) in standard wNAF generation;
+             * for modified window NAFs, it may also be 2^w
+             */
+            if (window_val != 0 && window_val != next_bit
+                && window_val != bit) {
+                ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+        }
+
+        r[j++] = sign * digit;
+
+        window_val >>= 1;
+        window_val += bit * BN_is_bit_set(scalar, j + w);
+
+        if (window_val > next_bit) {
+            ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+            goto err;
+        }
+    }
+
+    if (j > len + 1) {
+        ECerr(EC_F_COMPUTE_WNAF, ERR_R_INTERNAL_ERROR);
+        goto err;
+    }
+    len = j;
+    ok = 1;
 
  err:
-	if (!ok)
-		{
-		OPENSSL_free(r);
-		r = NULL;
-		}
-	if (ok)
-		*ret_len = len;
-	return r;
-	}
-
-
-/* TODO: table should be optimised for the wNAF-based implementation,
- *       sometimes smaller windows will give better performance
- *       (thus the boundaries should be increased)
+    if (!ok) {
+        OPENSSL_free(r);
+        r = NULL;
+    }
+    if (ok)
+        *ret_len = len;
+    return r;
+}
+
+/*
+ * 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
+                ((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 = EC_EX_DATA_get_data(group->extra_data, ec_pre_comp_dup, ec_pre_comp_free, ec_pre_comp_clear_free);
-
-		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]);
-	wNAF     = OPENSSL_malloc((totalnum + 1) * sizeof wNAF[0]); /* includes space for pivot */
-	val_sub  = OPENSSL_malloc(totalnum * sizeof val_sub[0]);
-
-	/* Ensure wNAF is initialised in case we end up going to err */
-	if (wNAF) wNAF[0] = NULL;	/* preliminary pivot */
-
-	if (!wsize || !wNAF_len || !wNAF || !val_sub)
-		{
-		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] = 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 = 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;
-				if (tmp_len > max_len)
-					max_len = 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);
-						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);
-							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)))
-		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 1 /* optional; EC_window_bits_for_scalar_size assumes we do this step */
-	if (!EC_POINTs_make_affine(group, num_val, val, ctx))
-		goto err;
+                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 =
+            EC_EX_DATA_get_data(group->extra_data, ec_pre_comp_dup,
+                                ec_pre_comp_free, ec_pre_comp_clear_free);
+
+        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]);
+    wNAF = OPENSSL_malloc((totalnum + 1) * sizeof wNAF[0]); /* includes space
+                                                             * for pivot */
+    val_sub = OPENSSL_malloc(totalnum * sizeof val_sub[0]);
+
+    /* Ensure wNAF is initialised in case we end up going to err */
+    if (wNAF)
+        wNAF[0] = NULL;         /* preliminary pivot */
+
+    if (!wsize || !wNAF_len || !wNAF || !val_sub) {
+        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] =
+            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 = 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;
+                if (tmp_len > max_len)
+                    max_len = 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);
+                        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);
+                            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)))
+        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 1                           /* optional; EC_window_bits_for_scalar_size
+                                 * assumes we do this step */
+    if (!EC_POINTs_make_affine(group, num_val, val, ctx))
+        goto err;
 #endif
 
-	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;
+    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:
-	if (new_ctx != NULL)
-		BN_CTX_free(new_ctx);
-	if (tmp != NULL)
-		EC_POINT_free(tmp);
-	if (wsize != NULL)
-		OPENSSL_free(wsize);
-	if (wNAF_len != NULL)
-		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);
-		}
-	if (val_sub != NULL)
-		{
-		OPENSSL_free(val_sub);
-		}
-	return ret;
-	}
-
-
-/* ec_wNAF_precompute_mult()
+    if (new_ctx != NULL)
+        BN_CTX_free(new_ctx);
+    if (tmp != NULL)
+        EC_POINT_free(tmp);
+    if (wsize != NULL)
+        OPENSSL_free(wsize);
+    if (wNAF_len != NULL)
+        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);
+    }
+    if (val_sub != NULL) {
+        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;
@@ -764,178 +739,175 @@ int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
  * 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;
-	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_EX_DATA_free_data(&group->extra_data, ec_pre_comp_dup, ec_pre_comp_free, ec_pre_comp_clear_free);
-
-	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 = BN_CTX_get(ctx);
-	if (order == NULL) goto err;
-	
-	if (!EC_GROUP_get_order(group, order, ctx)) 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 (EC_POINT*)*(num + 1));
-	if (!points)
-		{
-		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)) || !(base = EC_POINT_new(group)))
-		{
-		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;
-
-	if (!EC_EX_DATA_set_data(&group->extra_data, pre_comp,
-		ec_pre_comp_dup, ec_pre_comp_free, ec_pre_comp_clear_free))
-		goto err;
-	pre_comp = NULL;
-
-	ret = 1;
+{
+    const EC_POINT *generator;
+    EC_POINT *tmp_point = NULL, *base = NULL, **var;
+    BN_CTX *new_ctx = NULL;
+    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_EX_DATA_free_data(&group->extra_data, ec_pre_comp_dup,
+                         ec_pre_comp_free, ec_pre_comp_clear_free);
+
+    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 = BN_CTX_get(ctx);
+    if (order == NULL)
+        goto err;
+
+    if (!EC_GROUP_get_order(group, order, ctx))
+        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(EC_POINT *) * (num + 1));
+    if (!points) {
+        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)) || !(base = EC_POINT_new(group))) {
+        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;
+
+    if (!EC_EX_DATA_set_data(&group->extra_data, pre_comp,
+                             ec_pre_comp_dup, ec_pre_comp_free,
+                             ec_pre_comp_clear_free))
+        goto err;
+    pre_comp = NULL;
+
+    ret = 1;
  err:
-	if (ctx != NULL)
-		BN_CTX_end(ctx);
-	if (new_ctx != NULL)
-		BN_CTX_free(new_ctx);
-	if (pre_comp)
-		ec_pre_comp_free(pre_comp);
-	if (points)
-		{
-		EC_POINT **p;
-
-		for (p = points; *p != NULL; p++)
-			EC_POINT_free(*p);
-		OPENSSL_free(points);
-		}
-	if (tmp_point)
-		EC_POINT_free(tmp_point);
-	if (base)
-		EC_POINT_free(base);
-	return ret;
-	}
-
+    if (ctx != NULL)
+        BN_CTX_end(ctx);
+    if (new_ctx != NULL)
+        BN_CTX_free(new_ctx);
+    if (pre_comp)
+        ec_pre_comp_free(pre_comp);
+    if (points) {
+        EC_POINT **p;
+
+        for (p = points; *p != NULL; p++)
+            EC_POINT_free(*p);
+        OPENSSL_free(points);
+    }
+    if (tmp_point)
+        EC_POINT_free(tmp_point);
+    if (base)
+        EC_POINT_free(base);
+    return ret;
+}
 
 int ec_wNAF_have_precompute_mult(const EC_GROUP *group)
-	{
-	if (EC_EX_DATA_get_data(group->extra_data, ec_pre_comp_dup, ec_pre_comp_free, ec_pre_comp_clear_free) != NULL)
-		return 1;
-	else
-		return 0;
-	}
+{
+    if (EC_EX_DATA_get_data
+        (group->extra_data, ec_pre_comp_dup, ec_pre_comp_free,
+         ec_pre_comp_clear_free) != NULL)
+        return 1;
+    else
+        return 0;
+}