X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fec%2Fec_lib.c;h=02de91da918a92d5e7fe1cd33ee67b6ee8218ef9;hp=0597087cb78f545d87dc6c30a058169980515d7e;hb=b548a1f11c06ccdfa4f52a539912d22d77ee309e;hpb=b6db386ffd66f9227989df64ebedd95bc61597de

diff --git a/crypto/ec/ec_lib.c b/crypto/ec/ec_lib.c
index 0597087cb7..02de91da91 100644
--- a/crypto/ec/ec_lib.c
+++ b/crypto/ec/ec_lib.c
@@ -1,13 +1,16 @@
 /* crypto/ec/ec_lib.c */
+/*
+ * Originally written by Bodo Moeller for the OpenSSL project.
+ */
 /* ====================================================================
- * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * 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
@@ -52,6 +55,11 @@
  * Hudson (tjh@cryptsoft.com).
  *
  */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * Binary polynomial ECC support in OpenSSL originally developed by
+ * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
+ */
 
 #include <string.h>
 
@@ -60,658 +68,1038 @@
 
 #include "ec_lcl.h"
 
-static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
-
+const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
 
 /* functions for EC_GROUP objects */
 
 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
-	{
-	EC_GROUP *ret;
-
-	if (meth == NULL)
-		{
-		ECerr(EC_F_EC_GROUP_NEW, ERR_R_PASSED_NULL_PARAMETER);
-		return NULL;
-		}
-	if (meth->group_init == 0)
-		{
-		ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return NULL;
-		}
-
-	ret = OPENSSL_malloc(sizeof *ret);
-	if (ret == NULL)
-		{
-		ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
-		return NULL;
-		}
-
-	ret->meth = meth;
-
-	ret->extra_data = NULL;
-	ret->extra_data_dup_func = 0;
-	ret->extra_data_free_func = 0;
-	ret->extra_data_clear_free_func = 0;
-
-	ret->generator = NULL;
-	BN_init(&ret->order);
-	BN_init(&ret->cofactor);
-
-	ret->nid = 0;	
-
-	if (!meth->group_init(ret))
-		{
-		OPENSSL_free(ret);
-		return NULL;
-		}
-	
-	return ret;
-	}
-
+{
+    EC_GROUP *ret;
+
+    if (meth == NULL) {
+        ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
+        return NULL;
+    }
+    if (meth->group_init == 0) {
+        ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return NULL;
+    }
+
+    ret = OPENSSL_malloc(sizeof *ret);
+    if (ret == NULL) {
+        ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+
+    ret->meth = meth;
+
+    ret->extra_data = NULL;
+    ret->mont_data = NULL;
+
+    ret->generator = NULL;
+    ret->order = BN_new();
+    ret->cofactor = NULL;
+    if (!ret->order)
+        goto err;
+    ret->cofactor = BN_new();
+    if (!ret->cofactor)
+        goto err;
+
+    ret->curve_name = 0;
+    ret->asn1_flag = OPENSSL_EC_NAMED_CURVE;
+    ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
+
+    ret->seed = NULL;
+    ret->seed_len = 0;
+
+    if (!meth->group_init(ret))
+        goto err;
+
+    return ret;
+ err:
+    BN_free(ret->order);
+    BN_free(ret->cofactor);
+    OPENSSL_free(ret);
+    return NULL;
+}
 
 void EC_GROUP_free(EC_GROUP *group)
-	{
-	if (group->meth->group_finish != 0)
-		group->meth->group_finish(group);
-
-	EC_GROUP_free_extra_data(group);
-
-	if (group->generator != NULL)
-		EC_POINT_free(group->generator);
-	BN_free(&group->order);
-	BN_free(&group->cofactor);
+{
+    if (!group)
+        return;
 
-	OPENSSL_free(group);
-	}
- 
+    if (group->meth->group_finish != 0)
+        group->meth->group_finish(group);
 
-void EC_GROUP_clear_free(EC_GROUP *group)
-	{
-	if (group->meth->group_clear_finish != 0)
-		group->meth->group_clear_finish(group);
-	else if (group->meth != NULL && group->meth->group_finish != 0)
-		group->meth->group_finish(group);
-
-	EC_GROUP_clear_free_extra_data(group);
+    EC_EX_DATA_free_all_data(&group->extra_data);
 
-	if (group->generator != NULL)
-		EC_POINT_clear_free(group->generator);
-	BN_clear_free(&group->order);
-	BN_clear_free(&group->cofactor);
+    BN_MONT_CTX_free(group->mont_data);
 
-	memset(group, 0, sizeof *group);
-	OPENSSL_free(group);
-	}
+    EC_POINT_free(group->generator);
+    BN_free(group->order);
+    BN_free(group->cofactor);
 
+    if (group->seed)
+        OPENSSL_free(group->seed);
 
-int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
-	{
-	if (dest->meth->group_copy == 0)
-		{
-		ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (dest->meth != src->meth)
-		{
-		ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	if (dest == src)
-		return 1;
-	
-	EC_GROUP_clear_free_extra_data(dest);
-	if (src->extra_data_dup_func)
-		{
-		if (src->extra_data != NULL)
-			{
-			dest->extra_data = src->extra_data_dup_func(src->extra_data);
-			if (dest->extra_data == NULL)
-				return 0;
-			}
-
-		dest->extra_data_dup_func = src->extra_data_dup_func;
-		dest->extra_data_free_func = src->extra_data_free_func;
-		dest->extra_data_clear_free_func = src->extra_data_clear_free_func;
-		}
-
-	if (src->generator != NULL)
-		{
-		if (dest->generator == NULL)
-			{
-			dest->generator = EC_POINT_new(dest);
-			if (dest->generator == NULL) return 0;
-			}
-		if (!EC_POINT_copy(dest->generator, src->generator)) return 0;
-		}
-	else
-		{
-		/* src->generator == NULL */
-		if (dest->generator != NULL)
-			{
-			EC_POINT_clear_free(dest->generator);
-			dest->generator = NULL;
-			}
-		}
-
-	if (!BN_copy(&dest->order, &src->order)) return 0;
-	if (!BN_copy(&dest->cofactor, &src->cofactor)) return 0;
-
-	dest->nid = src->nid;
-
-	return dest->meth->group_copy(dest, src);
-	}
-
-
-const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
-	{
-	return group->meth;
-	}
-
+    OPENSSL_free(group);
+}
 
-int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
-	{
-	if (generator == NULL)
-		{
-		ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
-		return 0   ;
-		}
-
-	if (group->generator == NULL)
-		{
-		group->generator = EC_POINT_new(group);
-		if (group->generator == NULL) return 0;
-		}
-	if (!EC_POINT_copy(group->generator, generator)) return 0;
+void EC_GROUP_clear_free(EC_GROUP *group)
+{
+    if (!group)
+        return;
 
-	if (order != NULL)
-		{ if (!BN_copy(&group->order, order)) return 0; }	
-	else
-		{ if (!BN_zero(&group->order)) return 0; }	
+    if (group->meth->group_clear_finish != 0)
+        group->meth->group_clear_finish(group);
+    else if (group->meth->group_finish != 0)
+        group->meth->group_finish(group);
 
-	if (cofactor != NULL)
-		{ if (!BN_copy(&group->cofactor, cofactor)) return 0; }	
-	else
-		{ if (!BN_zero(&group->cofactor)) return 0; }	
+    EC_EX_DATA_clear_free_all_data(&group->extra_data);
 
-	return 1;
-	}
+    BN_MONT_CTX_free(group->mont_data);
 
+    EC_POINT_clear_free(group->generator);
+    BN_clear_free(group->order);
+    BN_clear_free(group->cofactor);
+    OPENSSL_clear_free(group->seed, group->seed_len);
+    OPENSSL_clear_free(group, sizeof *group);
+}
 
-EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
-	{
-	return group->generator;
-	}
+int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
+{
+    EC_EXTRA_DATA *d;
+
+    if (dest->meth->group_copy == 0) {
+        ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (dest->meth != src->meth) {
+        ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    if (dest == src)
+        return 1;
+
+    EC_EX_DATA_free_all_data(&dest->extra_data);
+
+    for (d = src->extra_data; d != NULL; d = d->next) {
+        void *t = d->dup_func(d->data);
+
+        if (t == NULL)
+            return 0;
+        if (!EC_EX_DATA_set_data
+            (&dest->extra_data, t, d->dup_func, d->free_func,
+             d->clear_free_func))
+            return 0;
+    }
+
+    if (src->mont_data != NULL) {
+        if (dest->mont_data == NULL) {
+            dest->mont_data = BN_MONT_CTX_new();
+            if (dest->mont_data == NULL)
+                return 0;
+        }
+        if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
+            return 0;
+    } else {
+        /* src->generator == NULL */
+        BN_MONT_CTX_free(dest->mont_data);
+        dest->mont_data = NULL;
+    }
+
+    if (src->generator != NULL) {
+        if (dest->generator == NULL) {
+            dest->generator = EC_POINT_new(dest);
+            if (dest->generator == NULL)
+                return 0;
+        }
+        if (!EC_POINT_copy(dest->generator, src->generator))
+            return 0;
+    } else {
+        /* src->generator == NULL */
+        EC_POINT_clear_free(dest->generator);
+        dest->generator = NULL;
+    }
+
+    if (!BN_copy(dest->order, src->order))
+        return 0;
+    if (!BN_copy(dest->cofactor, src->cofactor))
+        return 0;
+
+    dest->curve_name = src->curve_name;
+    dest->asn1_flag = src->asn1_flag;
+    dest->asn1_form = src->asn1_form;
+
+    if (src->seed) {
+        OPENSSL_free(dest->seed);
+        dest->seed = OPENSSL_malloc(src->seed_len);
+        if (dest->seed == NULL)
+            return 0;
+        if (!memcpy(dest->seed, src->seed, src->seed_len))
+            return 0;
+        dest->seed_len = src->seed_len;
+    } else {
+        OPENSSL_free(dest->seed);
+        dest->seed = NULL;
+        dest->seed_len = 0;
+    }
+
+    return dest->meth->group_copy(dest, src);
+}
+
+EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
+{
+    EC_GROUP *t = NULL;
+    int ok = 0;
+
+    if (a == NULL)
+        return NULL;
+
+    if ((t = EC_GROUP_new(a->meth)) == NULL)
+        return (NULL);
+    if (!EC_GROUP_copy(t, a))
+        goto err;
+
+    ok = 1;
+
+ err:
+    if (!ok) {
+        EC_GROUP_free(t);
+        return NULL;
+    }
+        return t;
+}
 
+const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
+{
+    return group->meth;
+}
+
+int EC_METHOD_get_field_type(const EC_METHOD *meth)
+{
+    return meth->field_type;
+}
+
+int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
+                           const BIGNUM *order, const BIGNUM *cofactor)
+{
+    if (generator == NULL) {
+        ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
+        return 0;
+    }
+
+    if (group->generator == NULL) {
+        group->generator = EC_POINT_new(group);
+        if (group->generator == NULL)
+            return 0;
+    }
+    if (!EC_POINT_copy(group->generator, generator))
+        return 0;
+
+    if (order != NULL) {
+        if (!BN_copy(group->order, order))
+            return 0;
+    } else
+        BN_zero(group->order);
+
+    if (cofactor != NULL) {
+        if (!BN_copy(group->cofactor, cofactor))
+            return 0;
+    } else
+        BN_zero(group->cofactor);
+
+    /*
+     * We ignore the return value because some groups have an order with
+     * factors of two, which makes the Montgomery setup fail.
+     * |group->mont_data| will be NULL in this case.
+     */
+    ec_precompute_mont_data(group);
+
+    return 1;
+}
+
+const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
+{
+    return group->generator;
+}
+
+BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
+{
+    return group->mont_data;
+}
 
 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
-	{
-	if (!BN_copy(order, &group->order))
-		return 0;
-
-	return !BN_is_zero(order);
-	}
-
-
-int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
-	{
-	if (!BN_copy(cofactor, &group->cofactor))
-		return 0;
-
-	return !BN_is_zero(&group->cofactor);
-	}
-
-
-void EC_GROUP_set_nid(EC_GROUP *group, int nid)
-	{
-	group->nid = nid;
-	}
-
-
-int EC_GROUP_get_nid(const EC_GROUP *group)
-	{
-	return group->nid;
-	}
-
-
-int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
-	{
-	if (group->meth->group_set_curve_GFp == 0)
-		{
-		ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	return group->meth->group_set_curve_GFp(group, p, a, b, ctx);
-	}
+{
+    if (!BN_copy(order, group->order))
+        return 0;
+
+    return !BN_is_zero(order);
+}
+
+int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
+                          BN_CTX *ctx)
+{
+    if (!BN_copy(cofactor, group->cofactor))
+        return 0;
+
+    return !BN_is_zero(group->cofactor);
+}
+
+void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
+{
+    group->curve_name = nid;
+}
+
+int EC_GROUP_get_curve_name(const EC_GROUP *group)
+{
+    return group->curve_name;
+}
+
+void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
+{
+    group->asn1_flag = flag;
+}
+
+int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
+{
+    return group->asn1_flag;
+}
+
+void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
+                                        point_conversion_form_t form)
+{
+    group->asn1_form = form;
+}
+
+point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
+                                                           *group)
+{
+    return group->asn1_form;
+}
+
+size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
+{
+    OPENSSL_free(group->seed);
+    group->seed = NULL;
+    group->seed_len = 0;
+
+    if (!len || !p)
+        return 1;
+
+    if ((group->seed = OPENSSL_malloc(len)) == NULL)
+        return 0;
+    memcpy(group->seed, p, len);
+    group->seed_len = len;
+
+    return len;
+}
+
+unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
+{
+    return group->seed;
+}
+
+size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
+{
+    return group->seed_len;
+}
+
+int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
+                           const BIGNUM *b, BN_CTX *ctx)
+{
+    if (group->meth->group_set_curve == 0) {
+        ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_set_curve(group, p, a, b, ctx);
+}
+
+int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
+                           BIGNUM *b, BN_CTX *ctx)
+{
+    if (group->meth->group_get_curve == 0) {
+        ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_get_curve(group, p, a, b, ctx);
+}
+
+#ifndef OPENSSL_NO_EC2M
+int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
+                            const BIGNUM *b, BN_CTX *ctx)
+{
+    if (group->meth->group_set_curve == 0) {
+        ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_set_curve(group, p, a, b, ctx);
+}
+
+int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
+                            BIGNUM *b, BN_CTX *ctx)
+{
+    if (group->meth->group_get_curve == 0) {
+        ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_get_curve(group, p, a, b, ctx);
+}
+#endif
+
+int EC_GROUP_get_degree(const EC_GROUP *group)
+{
+    if (group->meth->group_get_degree == 0) {
+        ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_get_degree(group);
+}
 
+int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
+{
+    if (group->meth->group_check_discriminant == 0) {
+        ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    return group->meth->group_check_discriminant(group, ctx);
+}
+
+int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
+{
+    int r = 0;
+    BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
+    BN_CTX *ctx_new = NULL;
+
+    /* compare the field types */
+    if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
+        EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
+        return 1;
+    /* compare the curve name (if present in both) */
+    if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
+        EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
+        return 1;
+
+    if (!ctx)
+        ctx_new = ctx = BN_CTX_new();
+    if (!ctx)
+        return -1;
+
+    BN_CTX_start(ctx);
+    a1 = BN_CTX_get(ctx);
+    a2 = BN_CTX_get(ctx);
+    a3 = BN_CTX_get(ctx);
+    b1 = BN_CTX_get(ctx);
+    b2 = BN_CTX_get(ctx);
+    b3 = BN_CTX_get(ctx);
+    if (!b3) {
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx_new);
+        return -1;
+    }
+
+    /*
+     * XXX This approach assumes that the external representation of curves
+     * over the same field type is the same.
+     */
+    if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
+        !b->meth->group_get_curve(b, b1, b2, b3, ctx))
+        r = 1;
+
+    if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
+        r = 1;
+
+    /* XXX EC_POINT_cmp() assumes that the methods are equal */
+    if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
+                          EC_GROUP_get0_generator(b), ctx))
+        r = 1;
+
+    if (!r) {
+        /* compare the order and cofactor */
+        if (!EC_GROUP_get_order(a, a1, ctx) ||
+            !EC_GROUP_get_order(b, b1, ctx) ||
+            !EC_GROUP_get_cofactor(a, a2, ctx) ||
+            !EC_GROUP_get_cofactor(b, b2, ctx)) {
+            BN_CTX_end(ctx);
+            BN_CTX_free(ctx_new);
+            return -1;
+        }
+        if (BN_cmp(a1, b1) || BN_cmp(a2, b2))
+            r = 1;
+    }
+
+    BN_CTX_end(ctx);
+    BN_CTX_free(ctx_new);
+
+    return r;
+}
 
-int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
-	{
-	if (group->meth->group_get_curve_GFp == 0)
-		{
-		ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	return group->meth->group_get_curve_GFp(group, p, a, b, ctx);
-	}
+/* this has 'package' visibility */
+int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data,
+                        void *(*dup_func) (void *),
+                        void (*free_func) (void *),
+                        void (*clear_free_func) (void *))
+{
+    EC_EXTRA_DATA *d;
+
+    if (ex_data == NULL)
+        return 0;
+
+    for (d = *ex_data; d != NULL; d = d->next) {
+        if (d->dup_func == dup_func && d->free_func == free_func
+            && d->clear_free_func == clear_free_func) {
+            ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL);
+            return 0;
+        }
+    }
+
+    if (data == NULL)
+        /* no explicit entry needed */
+        return 1;
+
+    d = OPENSSL_malloc(sizeof *d);
+    if (d == NULL)
+        return 0;
+
+    d->data = data;
+    d->dup_func = dup_func;
+    d->free_func = free_func;
+    d->clear_free_func = clear_free_func;
+
+    d->next = *ex_data;
+    *ex_data = d;
+
+    return 1;
+}
 
+/* this has 'package' visibility */
+void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data,
+                          void *(*dup_func) (void *),
+                          void (*free_func) (void *),
+                          void (*clear_free_func) (void *))
+{
+    const EC_EXTRA_DATA *d;
+
+    for (d = ex_data; d != NULL; d = d->next) {
+        if (d->dup_func == dup_func && d->free_func == free_func
+            && d->clear_free_func == clear_free_func)
+            return d->data;
+    }
+
+    return NULL;
+}
 
-int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
-	{
-	if (group->meth->group_check_discriminant == 0)
-		{
-		ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	return group->meth->group_check_discriminant(group, ctx);
-	}
+/* this has 'package' visibility */
+void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data,
+                          void *(*dup_func) (void *),
+                          void (*free_func) (void *),
+                          void (*clear_free_func) (void *))
+{
+    EC_EXTRA_DATA **p;
+
+    if (ex_data == NULL)
+        return;
+
+    for (p = ex_data; *p != NULL; p = &((*p)->next)) {
+        if ((*p)->dup_func == dup_func && (*p)->free_func == free_func
+            && (*p)->clear_free_func == clear_free_func) {
+            EC_EXTRA_DATA *next = (*p)->next;
+
+            (*p)->free_func((*p)->data);
+            OPENSSL_free(*p);
+
+            *p = next;
+            return;
+        }
+    }
+}
 
+/* this has 'package' visibility */
+void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data,
+                                void *(*dup_func) (void *),
+                                void (*free_func) (void *),
+                                void (*clear_free_func) (void *))
+{
+    EC_EXTRA_DATA **p;
+
+    if (ex_data == NULL)
+        return;
+
+    for (p = ex_data; *p != NULL; p = &((*p)->next)) {
+        if ((*p)->dup_func == dup_func && (*p)->free_func == free_func
+            && (*p)->clear_free_func == clear_free_func) {
+            EC_EXTRA_DATA *next = (*p)->next;
+
+            (*p)->clear_free_func((*p)->data);
+            OPENSSL_free(*p);
+
+            *p = next;
+            return;
+        }
+    }
+}
 
 /* this has 'package' visibility */
-int EC_GROUP_set_extra_data(EC_GROUP *group, void *extra_data, void *(*extra_data_dup_func)(void *),
-	void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
-	{
-	if ((group->extra_data != NULL)
-		|| (group->extra_data_dup_func != 0)
-		|| (group->extra_data_free_func != 0)
-		|| (group->extra_data_clear_free_func != 0))
-		{
-		ECerr(EC_F_EC_GROUP_SET_EXTRA_DATA, EC_R_SLOT_FULL);
-		return 0;
-		}
-
-	group->extra_data = extra_data;
-	group->extra_data_dup_func = extra_data_dup_func;
-	group->extra_data_free_func = extra_data_free_func;
-	group->extra_data_clear_free_func = extra_data_clear_free_func;
-	return 1;
-	}
+void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data)
+{
+    EC_EXTRA_DATA *d;
 
+    if (ex_data == NULL)
+        return;
 
-/* this has 'package' visibility */
-void *EC_GROUP_get_extra_data(const EC_GROUP *group, void *(*extra_data_dup_func)(void *),
-	void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
-	{
-	if ((group->extra_data_dup_func != extra_data_dup_func)
-		|| (group->extra_data_free_func != extra_data_free_func)
-		|| (group->extra_data_clear_free_func != extra_data_clear_free_func))
-		{
-		ECerr(EC_F_EC_GROUP_GET_EXTRA_DATA, EC_R_NO_SUCH_EXTRA_DATA);
-		return NULL;
-		}
+    d = *ex_data;
+    while (d) {
+        EC_EXTRA_DATA *next = d->next;
 
-	return group->extra_data;
-	}
+        d->free_func(d->data);
+        OPENSSL_free(d);
 
+        d = next;
+    }
+    *ex_data = NULL;
+}
 
 /* this has 'package' visibility */
-void EC_GROUP_free_extra_data(EC_GROUP *group)
-	{
-	if (group->extra_data_free_func)
-		group->extra_data_free_func(group->extra_data);
-	group->extra_data = NULL;
-	group->extra_data_dup_func = 0;
-	group->extra_data_free_func = 0;
-	group->extra_data_clear_free_func = 0;
-	}
+void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data)
+{
+    EC_EXTRA_DATA *d;
 
+    if (ex_data == NULL)
+        return;
 
-/* this has 'package' visibility */
-void EC_GROUP_clear_free_extra_data(EC_GROUP *group)
-	{
-	if (group->extra_data_clear_free_func)
-		group->extra_data_clear_free_func(group->extra_data);
-	else if (group->extra_data_free_func)
-		group->extra_data_free_func(group->extra_data);
-	group->extra_data = NULL;
-	group->extra_data_dup_func = 0;
-	group->extra_data_free_func = 0;
-	group->extra_data_clear_free_func = 0;
-	}
+    d = *ex_data;
+    while (d) {
+        EC_EXTRA_DATA *next = d->next;
 
+        d->clear_free_func(d->data);
+        OPENSSL_free(d);
+
+        d = next;
+    }
+    *ex_data = NULL;
+}
 
 /* functions for EC_POINT objects */
 
 EC_POINT *EC_POINT_new(const EC_GROUP *group)
-	{
-	EC_POINT *ret;
-
-	if (group == NULL)
-		{
-		ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
-		return NULL;
-		}
-	if (group->meth->point_init == 0)
-		{
-		ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return NULL;
-		}
-
-	ret = OPENSSL_malloc(sizeof *ret);
-	if (ret == NULL)
-		{
-		ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
-		return NULL;
-		}
-
-	ret->meth = group->meth;
-	
-	if (!ret->meth->point_init(ret))
-		{
-		OPENSSL_free(ret);
-		return NULL;
-		}
-	
-	return ret;
-	}
-
+{
+    EC_POINT *ret;
+
+    if (group == NULL) {
+        ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
+        return NULL;
+    }
+    if (group->meth->point_init == 0) {
+        ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return NULL;
+    }
+
+    ret = OPENSSL_malloc(sizeof *ret);
+    if (ret == NULL) {
+        ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+
+    ret->meth = group->meth;
+
+    if (!ret->meth->point_init(ret)) {
+        OPENSSL_free(ret);
+        return NULL;
+    }
+
+    return ret;
+}
 
 void EC_POINT_free(EC_POINT *point)
-	{
-	if (point->meth->point_finish != 0)
-		point->meth->point_finish(point);
-	OPENSSL_free(point);
-	}
- 
+{
+    if (!point)
+        return;
+
+    if (point->meth->point_finish != 0)
+        point->meth->point_finish(point);
+    OPENSSL_free(point);
+}
 
 void EC_POINT_clear_free(EC_POINT *point)
-	{
-	if (point->meth->point_clear_finish != 0)
-		point->meth->point_clear_finish(point);
-	else if (point->meth != NULL && point->meth->point_finish != 0)
-		point->meth->point_finish(point);
-	memset(point, 0, sizeof *point);
-	OPENSSL_free(point);
-	}
+{
+    if (!point)
+        return;
 
+    if (point->meth->point_clear_finish != 0)
+        point->meth->point_clear_finish(point);
+    else if (point->meth->point_finish != 0)
+        point->meth->point_finish(point);
+    OPENSSL_clear_free(point, sizeof *point);
+}
 
 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
-	{
-	if (dest->meth->point_copy == 0)
-		{
-		ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (dest->meth != src->meth)
-		{
-		ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	if (dest == src)
-		return 1;
-	return dest->meth->point_copy(dest, src);
-	}
-
+{
+    if (dest->meth->point_copy == 0) {
+        ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (dest->meth != src->meth) {
+        ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    if (dest == src)
+        return 1;
+    return dest->meth->point_copy(dest, src);
+}
+
+EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
+{
+    EC_POINT *t;
+    int r;
+
+    if (a == NULL)
+        return NULL;
+
+    t = EC_POINT_new(group);
+    if (t == NULL)
+        return (NULL);
+    r = EC_POINT_copy(t, a);
+    if (!r) {
+        EC_POINT_free(t);
+        return NULL;
+    }
+    return t;
+}
 
 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
-	{
-	return point->meth;
-	}
-
+{
+    return point->meth;
+}
 
 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
-	{
-	if (group->meth->point_set_to_infinity == 0)
-		{
-		ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_set_to_infinity(group, point);
-	}
-
-
-int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
-	const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
-	{
-	if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
-		{
-		ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
-	}
-
-
-int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
-	BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
-	{
-	if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
-		{
-		ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
-	}
-
-
-int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
-	const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
-	{
-	if (group->meth->point_set_affine_coordinates_GFp == 0)
-		{
-		ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_set_affine_coordinates_GFp(group, point, x, y, ctx);
-	}
-
-
-int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
-	BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
-	{
-	if (group->meth->point_get_affine_coordinates_GFp == 0)
-		{
-		ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_get_affine_coordinates_GFp(group, point, x, y, ctx);
-	}
-
-
-int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
-	const BIGNUM *x, int y_bit, BN_CTX *ctx)
-	{
-	if (group->meth->point_set_compressed_coordinates_GFp == 0)
-		{
-		ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_set_compressed_coordinates_GFp(group, point, x, y_bit, ctx);
-	}
-
-
-size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
-        unsigned char *buf, size_t len, BN_CTX *ctx)
-	{
-	if (group->meth->point2oct == 0)
-		{
-		ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point2oct(group, point, form, buf, len, ctx);
-	}
-
-
-int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
-        const unsigned char *buf, size_t len, BN_CTX *ctx)
-	{
-	if (group->meth->oct2point == 0)
-		{
-		ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->oct2point(group, point, buf, len, ctx);
-	}
-
-
-int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
-	{
-	if (group->meth->add == 0)
-		{
-		ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
-		{
-		ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->add(group, r, a, b, ctx);
-	}
-
-
-int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
-	{
-	if (group->meth->dbl == 0)
-		{
-		ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if ((group->meth != r->meth) || (r->meth != a->meth))
-		{
-		ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->dbl(group, r, a, ctx);
-	}
-
+{
+    if (group->meth->point_set_to_infinity == 0) {
+        ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_set_to_infinity(group, point);
+}
+
+int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
+                                             EC_POINT *point, const BIGNUM *x,
+                                             const BIGNUM *y, const BIGNUM *z,
+                                             BN_CTX *ctx)
+{
+    if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
+        ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
+                                                              y, z, ctx);
+}
+
+int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
+                                             const EC_POINT *point, BIGNUM *x,
+                                             BIGNUM *y, BIGNUM *z,
+                                             BN_CTX *ctx)
+{
+    if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
+        ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
+                                                              y, z, ctx);
+}
+
+int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
+                                        EC_POINT *point, const BIGNUM *x,
+                                        const BIGNUM *y, BN_CTX *ctx)
+{
+    if (group->meth->point_set_affine_coordinates == 0) {
+        ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
+}
+
+#ifndef OPENSSL_NO_EC2M
+int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
+                                         EC_POINT *point, const BIGNUM *x,
+                                         const BIGNUM *y, BN_CTX *ctx)
+{
+    if (group->meth->point_set_affine_coordinates == 0) {
+        ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
+}
+#endif
+
+int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
+                                        const EC_POINT *point, BIGNUM *x,
+                                        BIGNUM *y, BN_CTX *ctx)
+{
+    if (group->meth->point_get_affine_coordinates == 0) {
+        ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
+}
+
+#ifndef OPENSSL_NO_EC2M
+int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
+                                         const EC_POINT *point, BIGNUM *x,
+                                         BIGNUM *y, BN_CTX *ctx)
+{
+    if (group->meth->point_get_affine_coordinates == 0) {
+        ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
+              EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
+}
+#endif
+
+int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+                 const EC_POINT *b, BN_CTX *ctx)
+{
+    if (group->meth->add == 0) {
+        ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if ((group->meth != r->meth) || (r->meth != a->meth)
+        || (a->meth != b->meth)) {
+        ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->add(group, r, a, b, ctx);
+}
+
+int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+                 BN_CTX *ctx)
+{
+    if (group->meth->dbl == 0) {
+        ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if ((group->meth != r->meth) || (r->meth != a->meth)) {
+        ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->dbl(group, r, a, ctx);
+}
 
 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
-	{
-	if (group->meth->dbl == 0)
-		{
-		ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != a->meth)
-		{
-		ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->invert(group, a, ctx);
-	}
-
+{
+    if (group->meth->invert == 0) {
+        ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != a->meth) {
+        ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->invert(group, a, ctx);
+}
 
 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
-	{
-	if (group->meth->is_at_infinity == 0)
-		{
-		ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->is_at_infinity(group, point);
-	}
-
-
-int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
-	{
-	if (group->meth->is_on_curve == 0)
-		{
-		ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->is_on_curve(group, point, ctx);
-	}
-
-
-int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
-	{
-	if (group->meth->point_cmp == 0)
-		{
-		ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if ((group->meth != a->meth) || (a->meth != b->meth))
-		{
-		ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->point_cmp(group, a, b, ctx);
-	}
-
+{
+    if (group->meth->is_at_infinity == 0) {
+        ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->is_at_infinity(group, point);
+}
+
+int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
+                         BN_CTX *ctx)
+{
+    if (group->meth->is_on_curve == 0) {
+        ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->is_on_curve(group, point, ctx);
+}
+
+int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
+                 BN_CTX *ctx)
+{
+    if (group->meth->point_cmp == 0) {
+        ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return -1;
+    }
+    if ((group->meth != a->meth) || (a->meth != b->meth)) {
+        ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
+        return -1;
+    }
+    return group->meth->point_cmp(group, a, b, ctx);
+}
 
 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
-	{
-	if (group->meth->make_affine == 0)
-		{
-		ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (group->meth != point->meth)
-		{
-		ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
-		return 0;
-		}
-	return group->meth->make_affine(group, point, ctx);
-	}
-
-
-int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
-	{
-	size_t i;
-
-	if (group->meth->points_make_affine == 0)
-		{
-		ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	for (i = 0; i < num; i++)
-		{
-		if (group->meth != points[i]->meth)
-			{
-			ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
-			return 0;
-			}
-		}
-	return group->meth->points_make_affine(group, num, points, ctx);
-	}
+{
+    if (group->meth->make_affine == 0) {
+        ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (group->meth != point->meth) {
+        ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
+        return 0;
+    }
+    return group->meth->make_affine(group, point, ctx);
+}
+
+int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
+                          EC_POINT *points[], BN_CTX *ctx)
+{
+    size_t i;
+
+    if (group->meth->points_make_affine == 0) {
+        ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    for (i = 0; i < num; i++) {
+        if (group->meth != points[i]->meth) {
+            ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
+            return 0;
+        }
+    }
+    return group->meth->points_make_affine(group, num, points, ctx);
+}
+
+/*
+ * Functions for point multiplication. If group->meth->mul is 0, we use the
+ * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
+ * methods.
+ */
+
+int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
+                  size_t num, const EC_POINT *points[],
+                  const BIGNUM *scalars[], BN_CTX *ctx)
+{
+    if (group->meth->mul == 0)
+        /* use default */
+        return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
+
+    return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
+}
+
+int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
+                 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
+{
+    /* just a convenient interface to EC_POINTs_mul() */
+
+    const EC_POINT *points[1];
+    const BIGNUM *scalars[1];
+
+    points[0] = point;
+    scalars[0] = p_scalar;
+
+    return EC_POINTs_mul(group, r, g_scalar,
+                         (point != NULL
+                          && p_scalar != NULL), points, scalars, ctx);
+}
+
+int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
+{
+    if (group->meth->mul == 0)
+        /* use default */
+        return ec_wNAF_precompute_mult(group, ctx);
+
+    if (group->meth->precompute_mult != 0)
+        return group->meth->precompute_mult(group, ctx);
+    else
+        return 1;               /* nothing to do, so report success */
+}
+
+int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
+{
+    if (group->meth->mul == 0)
+        /* use default */
+        return ec_wNAF_have_precompute_mult(group);
+
+    if (group->meth->have_precompute_mult != 0)
+        return group->meth->have_precompute_mult(group);
+    else
+        return 0;               /* cannot tell whether precomputation has
+                                 * been performed */
+}
+
+/*
+ * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
+ * returns one on success. On error it returns zero.
+ */
+int ec_precompute_mont_data(EC_GROUP *group)
+{
+    BN_CTX *ctx = BN_CTX_new();
+    int ret = 0;
+
+    BN_MONT_CTX_free(group->mont_data);
+    group->mont_data = NULL;
+
+    if (ctx == NULL)
+        goto err;
+
+    group->mont_data = BN_MONT_CTX_new();
+    if (!group->mont_data)
+        goto err;
+
+    if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
+        BN_MONT_CTX_free(group->mont_data);
+        group->mont_data = NULL;
+        goto err;
+    }
+
+    ret = 1;
+
+ err:
+
+    BN_CTX_free(ctx);
+    return ret;
+}