Upgraded to openssl-1.0.2

1 files changed, 659 insertions, 582 deletions

diff --git a/openssl/crypto/ec/ec2_smpl.c b/openssl/crypto/ec/ec2_smpl.c
index 62223cbb0..077c7fc8d 100644
--- a/openssl/crypto/ec/ec2_smpl.c
+++ b/openssl/crypto/ec/ec2_smpl.c
@@ -21,7 +21,7 @@
  * 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
@@ -73,648 +73,725 @@
 
 #ifndef OPENSSL_NO_EC2M
 
-#ifdef OPENSSL_FIPS
-#include <openssl/fips.h>
-#endif
-
+# ifdef OPENSSL_FIPS
+#  include <openssl/fips.h>
+# endif
 
 const EC_METHOD *EC_GF2m_simple_method(void)
-	{
-	static const EC_METHOD ret = {
-		EC_FLAGS_DEFAULT_OCT,
-		NID_X9_62_characteristic_two_field,
-		ec_GF2m_simple_group_init,
-		ec_GF2m_simple_group_finish,
-		ec_GF2m_simple_group_clear_finish,
-		ec_GF2m_simple_group_copy,
-		ec_GF2m_simple_group_set_curve,
-		ec_GF2m_simple_group_get_curve,
-		ec_GF2m_simple_group_get_degree,
-		ec_GF2m_simple_group_check_discriminant,
-		ec_GF2m_simple_point_init,
-		ec_GF2m_simple_point_finish,
-		ec_GF2m_simple_point_clear_finish,
-		ec_GF2m_simple_point_copy,
-		ec_GF2m_simple_point_set_to_infinity,
-		0 /* set_Jprojective_coordinates_GFp */,
-		0 /* get_Jprojective_coordinates_GFp */,
-		ec_GF2m_simple_point_set_affine_coordinates,
-		ec_GF2m_simple_point_get_affine_coordinates,
-		0,0,0,
-		ec_GF2m_simple_add,
-		ec_GF2m_simple_dbl,
-		ec_GF2m_simple_invert,
-		ec_GF2m_simple_is_at_infinity,
-		ec_GF2m_simple_is_on_curve,
-		ec_GF2m_simple_cmp,
-		ec_GF2m_simple_make_affine,
-		ec_GF2m_simple_points_make_affine,
-
-		/* the following three method functions are defined in ec2_mult.c */
-		ec_GF2m_simple_mul,
-		ec_GF2m_precompute_mult,
-		ec_GF2m_have_precompute_mult,
-
-		ec_GF2m_simple_field_mul,
-		ec_GF2m_simple_field_sqr,
-		ec_GF2m_simple_field_div,
-		0 /* field_encode */,
-		0 /* field_decode */,
-		0 /* field_set_to_one */ };
-
-#ifdef OPENSSL_FIPS
-	if (FIPS_mode())
-		return fips_ec_gf2m_simple_method();
-#endif
-
-	return &ret;
-	}
-
-
-/* Initialize a GF(2^m)-based EC_GROUP structure.
- * Note that all other members are handled by EC_GROUP_new.
+{
+    static const EC_METHOD ret = {
+        EC_FLAGS_DEFAULT_OCT,
+        NID_X9_62_characteristic_two_field,
+        ec_GF2m_simple_group_init,
+        ec_GF2m_simple_group_finish,
+        ec_GF2m_simple_group_clear_finish,
+        ec_GF2m_simple_group_copy,
+        ec_GF2m_simple_group_set_curve,
+        ec_GF2m_simple_group_get_curve,
+        ec_GF2m_simple_group_get_degree,
+        ec_GF2m_simple_group_check_discriminant,
+        ec_GF2m_simple_point_init,
+        ec_GF2m_simple_point_finish,
+        ec_GF2m_simple_point_clear_finish,
+        ec_GF2m_simple_point_copy,
+        ec_GF2m_simple_point_set_to_infinity,
+        0 /* set_Jprojective_coordinates_GFp */ ,
+        0 /* get_Jprojective_coordinates_GFp */ ,
+        ec_GF2m_simple_point_set_affine_coordinates,
+        ec_GF2m_simple_point_get_affine_coordinates,
+        0, 0, 0,
+        ec_GF2m_simple_add,
+        ec_GF2m_simple_dbl,
+        ec_GF2m_simple_invert,
+        ec_GF2m_simple_is_at_infinity,
+        ec_GF2m_simple_is_on_curve,
+        ec_GF2m_simple_cmp,
+        ec_GF2m_simple_make_affine,
+        ec_GF2m_simple_points_make_affine,
+
+        /*
+         * the following three method functions are defined in ec2_mult.c
+         */
+        ec_GF2m_simple_mul,
+        ec_GF2m_precompute_mult,
+        ec_GF2m_have_precompute_mult,
+
+        ec_GF2m_simple_field_mul,
+        ec_GF2m_simple_field_sqr,
+        ec_GF2m_simple_field_div,
+        0 /* field_encode */ ,
+        0 /* field_decode */ ,
+        0                       /* field_set_to_one */
+    };
+
+# ifdef OPENSSL_FIPS
+    if (FIPS_mode())
+        return fips_ec_gf2m_simple_method();
+# endif
+
+    return &ret;
+}
+
+/*
+ * Initialize a GF(2^m)-based EC_GROUP structure. Note that all other members
+ * are handled by EC_GROUP_new.
  */
 int ec_GF2m_simple_group_init(EC_GROUP *group)
-	{
-	BN_init(&group->field);
-	BN_init(&group->a);
-	BN_init(&group->b);
-	return 1;
-	}
-
-
-/* Free a GF(2^m)-based EC_GROUP structure.
- * Note that all other members are handled by EC_GROUP_free.
+{
+    BN_init(&group->field);
+    BN_init(&group->a);
+    BN_init(&group->b);
+    return 1;
+}
+
+/*
+ * Free a GF(2^m)-based EC_GROUP structure. Note that all other members are
+ * handled by EC_GROUP_free.
  */
 void ec_GF2m_simple_group_finish(EC_GROUP *group)
-	{
-	BN_free(&group->field);
-	BN_free(&group->a);
-	BN_free(&group->b);
-	}
-
-
-/* Clear and free a GF(2^m)-based EC_GROUP structure.
- * Note that all other members are handled by EC_GROUP_clear_free.
+{
+    BN_free(&group->field);
+    BN_free(&group->a);
+    BN_free(&group->b);
+}
+
+/*
+ * Clear and free a GF(2^m)-based EC_GROUP structure. Note that all other
+ * members are handled by EC_GROUP_clear_free.
  */
 void ec_GF2m_simple_group_clear_finish(EC_GROUP *group)
-	{
-	BN_clear_free(&group->field);
-	BN_clear_free(&group->a);
-	BN_clear_free(&group->b);
-	group->poly[0] = 0;
-	group->poly[1] = 0;
-	group->poly[2] = 0;
-	group->poly[3] = 0;
-	group->poly[4] = 0;
-	group->poly[5] = -1;
-	}
-
-
-/* Copy a GF(2^m)-based EC_GROUP structure.
- * Note that all other members are handled by EC_GROUP_copy.
+{
+    BN_clear_free(&group->field);
+    BN_clear_free(&group->a);
+    BN_clear_free(&group->b);
+    group->poly[0] = 0;
+    group->poly[1] = 0;
+    group->poly[2] = 0;
+    group->poly[3] = 0;
+    group->poly[4] = 0;
+    group->poly[5] = -1;
+}
+
+/*
+ * Copy a GF(2^m)-based EC_GROUP structure. Note that all other members are
+ * handled by EC_GROUP_copy.
  */
 int ec_GF2m_simple_group_copy(EC_GROUP *dest, const EC_GROUP *src)
-	{
-	int i;
-	if (!BN_copy(&dest->field, &src->field)) return 0;
-	if (!BN_copy(&dest->a, &src->a)) return 0;
-	if (!BN_copy(&dest->b, &src->b)) return 0;
-	dest->poly[0] = src->poly[0];
-	dest->poly[1] = src->poly[1];
-	dest->poly[2] = src->poly[2];
-	dest->poly[3] = src->poly[3];
-	dest->poly[4] = src->poly[4];
-	dest->poly[5] = src->poly[5];
-	if (bn_wexpand(&dest->a, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) return 0;
-	if (bn_wexpand(&dest->b, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) return 0;
-	for (i = dest->a.top; i < dest->a.dmax; i++) dest->a.d[i] = 0;
-	for (i = dest->b.top; i < dest->b.dmax; i++) dest->b.d[i] = 0;
-	return 1;
-	}
-
+{
+    int i;
+    if (!BN_copy(&dest->field, &src->field))
+        return 0;
+    if (!BN_copy(&dest->a, &src->a))
+        return 0;
+    if (!BN_copy(&dest->b, &src->b))
+        return 0;
+    dest->poly[0] = src->poly[0];
+    dest->poly[1] = src->poly[1];
+    dest->poly[2] = src->poly[2];
+    dest->poly[3] = src->poly[3];
+    dest->poly[4] = src->poly[4];
+    dest->poly[5] = src->poly[5];
+    if (bn_wexpand(&dest->a, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2)
+        == NULL)
+        return 0;
+    if (bn_wexpand(&dest->b, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2)
+        == NULL)
+        return 0;
+    for (i = dest->a.top; i < dest->a.dmax; i++)
+        dest->a.d[i] = 0;
+    for (i = dest->b.top; i < dest->b.dmax; i++)
+        dest->b.d[i] = 0;
+    return 1;
+}
 
 /* Set the curve parameters of an EC_GROUP structure. */
 int ec_GF2m_simple_group_set_curve(EC_GROUP *group,
-	const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
-	{
-	int ret = 0, i;
-
-	/* group->field */
-	if (!BN_copy(&group->field, p)) goto err;
-	i = BN_GF2m_poly2arr(&group->field, group->poly, 6) - 1;
-	if ((i != 5) && (i != 3))
-		{
-		ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_SET_CURVE, EC_R_UNSUPPORTED_FIELD);
-		goto err;
-		}
-
-	/* group->a */
-	if (!BN_GF2m_mod_arr(&group->a, a, group->poly)) goto err;
-	if(bn_wexpand(&group->a, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) goto err;
-	for (i = group->a.top; i < group->a.dmax; i++) group->a.d[i] = 0;
-	
-	/* group->b */
-	if (!BN_GF2m_mod_arr(&group->b, b, group->poly)) goto err;
-	if(bn_wexpand(&group->b, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) goto err;
-	for (i = group->b.top; i < group->b.dmax; i++) group->b.d[i] = 0;
-		
-	ret = 1;
-  err:
-	return ret;
-	}
-
-
-/* Get the curve parameters of an EC_GROUP structure.
- * If p, a, or b are NULL then there values will not be set but the method will return with success.
+                                   const BIGNUM *p, const BIGNUM *a,
+                                   const BIGNUM *b, BN_CTX *ctx)
+{
+    int ret = 0, i;
+
+    /* group->field */
+    if (!BN_copy(&group->field, p))
+        goto err;
+    i = BN_GF2m_poly2arr(&group->field, group->poly, 6) - 1;
+    if ((i != 5) && (i != 3)) {
+        ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_SET_CURVE, EC_R_UNSUPPORTED_FIELD);
+        goto err;
+    }
+
+    /* group->a */
+    if (!BN_GF2m_mod_arr(&group->a, a, group->poly))
+        goto err;
+    if (bn_wexpand(&group->a, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2)
+        == NULL)
+        goto err;
+    for (i = group->a.top; i < group->a.dmax; i++)
+        group->a.d[i] = 0;
+
+    /* group->b */
+    if (!BN_GF2m_mod_arr(&group->b, b, group->poly))
+        goto err;
+    if (bn_wexpand(&group->b, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2)
+        == NULL)
+        goto err;
+    for (i = group->b.top; i < group->b.dmax; i++)
+        group->b.d[i] = 0;
+
+    ret = 1;
+ err:
+    return ret;
+}
+
+/*
+ * Get the curve parameters of an EC_GROUP structure. If p, a, or b are NULL
+ * then there values will not be set but the method will return with success.
  */
-int ec_GF2m_simple_group_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
-	{
-	int ret = 0;
-	
-	if (p != NULL)
-		{
-		if (!BN_copy(p, &group->field)) return 0;
-		}
-
-	if (a != NULL)
-		{
-		if (!BN_copy(a, &group->a)) goto err;
-		}
-
-	if (b != NULL)
-		{
-		if (!BN_copy(b, &group->b)) goto err;
-		}
-	
-	ret = 1;
-	
-  err:
-	return ret;
-	}
-
-
-/* Gets the degree of the field.  For a curve over GF(2^m) this is the value m. */
-int ec_GF2m_simple_group_get_degree(const EC_GROUP *group)
-	{
-	return BN_num_bits(&group->field)-1;
-	}
+int ec_GF2m_simple_group_get_curve(const EC_GROUP *group, BIGNUM *p,
+                                   BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
+{
+    int ret = 0;
+
+    if (p != NULL) {
+        if (!BN_copy(p, &group->field))
+            return 0;
+    }
+
+    if (a != NULL) {
+        if (!BN_copy(a, &group->a))
+            goto err;
+    }
+
+    if (b != NULL) {
+        if (!BN_copy(b, &group->b))
+            goto err;
+    }
+
+    ret = 1;
+
+ err:
+    return ret;
+}
 
+/*
+ * Gets the degree of the field.  For a curve over GF(2^m) this is the value
+ * m.
+ */
+int ec_GF2m_simple_group_get_degree(const EC_GROUP *group)
+{
+    return BN_num_bits(&group->field) - 1;
+}
 
-/* Checks the discriminant of the curve.
- * y^2 + x*y = x^3 + a*x^2 + b is an elliptic curve <=> b != 0 (mod p) 
+/*
+ * Checks the discriminant of the curve. y^2 + x*y = x^3 + a*x^2 + b is an
+ * elliptic curve <=> b != 0 (mod p)
  */
-int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
-	{
-	int ret = 0;
-	BIGNUM *b;
-	BN_CTX *new_ctx = NULL;
-
-	if (ctx == NULL)
-		{
-		ctx = new_ctx = BN_CTX_new();
-		if (ctx == NULL)
-			{
-			ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_CHECK_DISCRIMINANT, ERR_R_MALLOC_FAILURE);
-			goto err;
-			}
-		}
-	BN_CTX_start(ctx);
-	b = BN_CTX_get(ctx);
-	if (b == NULL) goto err;
-
-	if (!BN_GF2m_mod_arr(b, &group->b, group->poly)) goto err;
-	
-	/* check the discriminant:
-	 * y^2 + x*y = x^3 + a*x^2 + b is an elliptic curve <=> b != 0 (mod p) 
-	 */
-	if (BN_is_zero(b)) goto err;
-
-	ret = 1;
-
-err:
-	if (ctx != NULL)
-		BN_CTX_end(ctx);
-	if (new_ctx != NULL)
-		BN_CTX_free(new_ctx);
-	return ret;
-	}
+int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *group,
+                                            BN_CTX *ctx)
+{
+    int ret = 0;
+    BIGNUM *b;
+    BN_CTX *new_ctx = NULL;
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL) {
+            ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_CHECK_DISCRIMINANT,
+                  ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+    }
+    BN_CTX_start(ctx);
+    b = BN_CTX_get(ctx);
+    if (b == NULL)
+        goto err;
+
+    if (!BN_GF2m_mod_arr(b, &group->b, group->poly))
+        goto err;
+
+    /*
+     * check the discriminant: y^2 + x*y = x^3 + a*x^2 + b is an elliptic
+     * curve <=> b != 0 (mod p)
+     */
+    if (BN_is_zero(b))
+        goto err;
+
+    ret = 1;
 
+ err:
+    if (ctx != NULL)
+        BN_CTX_end(ctx);
+    if (new_ctx != NULL)
+        BN_CTX_free(new_ctx);
+    return ret;
+}
 
 /* Initializes an EC_POINT. */
 int ec_GF2m_simple_point_init(EC_POINT *point)
-	{
-	BN_init(&point->X);
-	BN_init(&point->Y);
-	BN_init(&point->Z);
-	return 1;
-	}
-
+{
+    BN_init(&point->X);
+    BN_init(&point->Y);
+    BN_init(&point->Z);
+    return 1;
+}
 
 /* Frees an EC_POINT. */
 void ec_GF2m_simple_point_finish(EC_POINT *point)
-	{
-	BN_free(&point->X);
-	BN_free(&point->Y);
-	BN_free(&point->Z);
-	}
-
+{
+    BN_free(&point->X);
+    BN_free(&point->Y);
+    BN_free(&point->Z);
+}
 
 /* Clears and frees an EC_POINT. */
 void ec_GF2m_simple_point_clear_finish(EC_POINT *point)
-	{
-	BN_clear_free(&point->X);
-	BN_clear_free(&point->Y);
-	BN_clear_free(&point->Z);
-	point->Z_is_one = 0;
-	}
-
-
-/* Copy the contents of one EC_POINT into another.  Assumes dest is initialized. */
-int ec_GF2m_simple_point_copy(EC_POINT *dest, const EC_POINT *src)
-	{
-	if (!BN_copy(&dest->X, &src->X)) return 0;
-	if (!BN_copy(&dest->Y, &src->Y)) return 0;
-	if (!BN_copy(&dest->Z, &src->Z)) return 0;
-	dest->Z_is_one = src->Z_is_one;
-
-	return 1;
-	}
-
-
-/* Set an EC_POINT to the point at infinity.  
- * A point at infinity is represented by having Z=0.
+{
+    BN_clear_free(&point->X);
+    BN_clear_free(&point->Y);
+    BN_clear_free(&point->Z);
+    point->Z_is_one = 0;
+}
+
+/*
+ * Copy the contents of one EC_POINT into another.  Assumes dest is
+ * initialized.
  */
-int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
-	{
-	point->Z_is_one = 0;
-	BN_zero(&point->Z);
-	return 1;
-	}
-
-
-/* Set the coordinates of an EC_POINT using affine coordinates. 
- * Note that the simple implementation only uses affine coordinates.
+int ec_GF2m_simple_point_copy(EC_POINT *dest, const EC_POINT *src)
+{
+    if (!BN_copy(&dest->X, &src->X))
+        return 0;
+    if (!BN_copy(&dest->Y, &src->Y))
+        return 0;
+    if (!BN_copy(&dest->Z, &src->Z))
+        return 0;
+    dest->Z_is_one = src->Z_is_one;
+
+    return 1;
+}
+
+/*
+ * Set an EC_POINT to the point at infinity. A point at infinity is
+ * represented by having Z=0.
  */
-int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *group, EC_POINT *point,
-	const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
-	{
-	int ret = 0;	
-	if (x == NULL || y == NULL)
-		{
-		ECerr(EC_F_EC_GF2M_SIMPLE_POINT_SET_AFFINE_COORDINATES, ERR_R_PASSED_NULL_PARAMETER);
-		return 0;
-		}
-
-	if (!BN_copy(&point->X, x)) goto err;
-	BN_set_negative(&point->X, 0);
-	if (!BN_copy(&point->Y, y)) goto err;
-	BN_set_negative(&point->Y, 0);
-	if (!BN_copy(&point->Z, BN_value_one())) goto err;
-	BN_set_negative(&point->Z, 0);
-	point->Z_is_one = 1;
-	ret = 1;
-
-  err:
-	return ret;
-	}
-
-
-/* Gets the affine coordinates of an EC_POINT. 
- * Note that the simple implementation only uses affine coordinates.
+int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *group,
+                                         EC_POINT *point)
+{
+    point->Z_is_one = 0;
+    BN_zero(&point->Z);
+    return 1;
+}
+
+/*
+ * Set the coordinates of an EC_POINT using affine coordinates. Note that
+ * the simple implementation only uses affine coordinates.
  */
-int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *point,
-	BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
-	{
-	int ret = 0;
-
-	if (EC_POINT_is_at_infinity(group, point))
-		{
-		ECerr(EC_F_EC_GF2M_SIMPLE_POINT_GET_AFFINE_COORDINATES, EC_R_POINT_AT_INFINITY);
-		return 0;
-		}
-
-	if (BN_cmp(&point->Z, BN_value_one())) 
-		{
-		ECerr(EC_F_EC_GF2M_SIMPLE_POINT_GET_AFFINE_COORDINATES, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
-		return 0;
-		}
-	if (x != NULL)
-		{
-		if (!BN_copy(x, &point->X)) goto err;
-		BN_set_negative(x, 0);
-		}
-	if (y != NULL)
-		{
-		if (!BN_copy(y, &point->Y)) goto err;
-		BN_set_negative(y, 0);
-		}
-	ret = 1;
-		
+int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *group,
+                                                EC_POINT *point,
+                                                const BIGNUM *x,
+                                                const BIGNUM *y, BN_CTX *ctx)
+{
+    int ret = 0;
+    if (x == NULL || y == NULL) {
+        ECerr(EC_F_EC_GF2M_SIMPLE_POINT_SET_AFFINE_COORDINATES,
+              ERR_R_PASSED_NULL_PARAMETER);
+        return 0;
+    }
+
+    if (!BN_copy(&point->X, x))
+        goto err;
+    BN_set_negative(&point->X, 0);
+    if (!BN_copy(&point->Y, y))
+        goto err;
+    BN_set_negative(&point->Y, 0);
+    if (!BN_copy(&point->Z, BN_value_one()))
+        goto err;
+    BN_set_negative(&point->Z, 0);
+    point->Z_is_one = 1;
+    ret = 1;
+
  err:
-	return ret;
-	}
+    return ret;
+}
 
-/* Computes a + b and stores the result in r.  r could be a or b, a could be b.
- * Uses algorithm A.10.2 of IEEE P1363.
+/*
+ * Gets the affine coordinates of an EC_POINT. Note that the simple
+ * implementation only uses affine coordinates.
  */
-int ec_GF2m_simple_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
-	{
-	BN_CTX *new_ctx = NULL;
-	BIGNUM *x0, *y0, *x1, *y1, *x2, *y2, *s, *t;
-	int ret = 0;
-	
-	if (EC_POINT_is_at_infinity(group, a))
-		{
-		if (!EC_POINT_copy(r, b)) return 0;
-		return 1;
-		}
-
-	if (EC_POINT_is_at_infinity(group, b))
-		{
-		if (!EC_POINT_copy(r, a)) return 0;
-		return 1;
-		}
-
-	if (ctx == NULL)
-		{
-		ctx = new_ctx = BN_CTX_new();
-		if (ctx == NULL)
-			return 0;
-		}
-
-	BN_CTX_start(ctx);
-	x0 = BN_CTX_get(ctx);
-	y0 = BN_CTX_get(ctx);
-	x1 = BN_CTX_get(ctx);
-	y1 = BN_CTX_get(ctx);
-	x2 = BN_CTX_get(ctx);
-	y2 = BN_CTX_get(ctx);
-	s = BN_CTX_get(ctx);
-	t = BN_CTX_get(ctx);
-	if (t == NULL) goto err;
-
-	if (a->Z_is_one) 
-		{
-		if (!BN_copy(x0, &a->X)) goto err;
-		if (!BN_copy(y0, &a->Y)) goto err;
-		}
-	else
-		{
-		if (!EC_POINT_get_affine_coordinates_GF2m(group, a, x0, y0, ctx)) goto err;
-		}
-	if (b->Z_is_one) 
-		{
-		if (!BN_copy(x1, &b->X)) goto err;
-		if (!BN_copy(y1, &b->Y)) goto err;
-		}
-	else
-		{
-		if (!EC_POINT_get_affine_coordinates_GF2m(group, b, x1, y1, ctx)) goto err;
-		}
-
-
-	if (BN_GF2m_cmp(x0, x1))
-		{
-		if (!BN_GF2m_add(t, x0, x1)) goto err;
-		if (!BN_GF2m_add(s, y0, y1)) goto err;
-		if (!group->meth->field_div(group, s, s, t, ctx)) goto err;
-		if (!group->meth->field_sqr(group, x2, s, ctx)) goto err;
-		if (!BN_GF2m_add(x2, x2, &group->a)) goto err;
-		if (!BN_GF2m_add(x2, x2, s)) goto err;
-		if (!BN_GF2m_add(x2, x2, t)) goto err;
-		}
-	else
-		{
-		if (BN_GF2m_cmp(y0, y1) || BN_is_zero(x1))
-			{
-			if (!EC_POINT_set_to_infinity(group, r)) goto err;
-			ret = 1;
-			goto err;
-			}
-		if (!group->meth->field_div(group, s, y1, x1, ctx)) goto err;
-		if (!BN_GF2m_add(s, s, x1)) goto err;
-		
-		if (!group->meth->field_sqr(group, x2, s, ctx)) goto err;
-		if (!BN_GF2m_add(x2, x2, s)) goto err;
-		if (!BN_GF2m_add(x2, x2, &group->a)) goto err;
-		}
-
-	if (!BN_GF2m_add(y2, x1, x2)) goto err;
-	if (!group->meth->field_mul(group, y2, y2, s, ctx)) goto err;
-	if (!BN_GF2m_add(y2, y2, x2)) goto err;
-	if (!BN_GF2m_add(y2, y2, y1)) goto err;
-
-	if (!EC_POINT_set_affine_coordinates_GF2m(group, r, x2, y2, ctx)) goto err;
-
-	ret = 1;
+int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *group,
+                                                const EC_POINT *point,
+                                                BIGNUM *x, BIGNUM *y,
+                                                BN_CTX *ctx)
+{
+    int ret = 0;
+
+    if (EC_POINT_is_at_infinity(group, point)) {
+        ECerr(EC_F_EC_GF2M_SIMPLE_POINT_GET_AFFINE_COORDINATES,
+              EC_R_POINT_AT_INFINITY);
+        return 0;
+    }
+
+    if (BN_cmp(&point->Z, BN_value_one())) {
+        ECerr(EC_F_EC_GF2M_SIMPLE_POINT_GET_AFFINE_COORDINATES,
+              ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return 0;
+    }
+    if (x != NULL) {
+        if (!BN_copy(x, &point->X))
+            goto err;
+        BN_set_negative(x, 0);
+    }
+    if (y != NULL) {
+        if (!BN_copy(y, &point->Y))
+            goto err;
+        BN_set_negative(y, 0);
+    }
+    ret = 1;
 
  err:
-	BN_CTX_end(ctx);
-	if (new_ctx != NULL)
-		BN_CTX_free(new_ctx);
-	return ret;
-	}
-
+    return ret;
+}
 
-/* Computes 2 * a and stores the result in r.  r could be a.
- * Uses algorithm A.10.2 of IEEE P1363.
+/*
+ * Computes a + b and stores the result in r.  r could be a or b, a could be
+ * b. Uses algorithm A.10.2 of IEEE P1363.
  */
-int ec_GF2m_simple_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
-	{
-	return ec_GF2m_simple_add(group, r, a, a, ctx);
-	}
+int ec_GF2m_simple_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+                       const EC_POINT *b, BN_CTX *ctx)
+{
+    BN_CTX *new_ctx = NULL;
+    BIGNUM *x0, *y0, *x1, *y1, *x2, *y2, *s, *t;
+    int ret = 0;
+
+    if (EC_POINT_is_at_infinity(group, a)) {
+        if (!EC_POINT_copy(r, b))
+            return 0;
+        return 1;
+    }
+
+    if (EC_POINT_is_at_infinity(group, b)) {
+        if (!EC_POINT_copy(r, a))
+            return 0;
+        return 1;
+    }
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            return 0;
+    }
+
+    BN_CTX_start(ctx);
+    x0 = BN_CTX_get(ctx);
+    y0 = BN_CTX_get(ctx);
+    x1 = BN_CTX_get(ctx);
+    y1 = BN_CTX_get(ctx);
+    x2 = BN_CTX_get(ctx);
+    y2 = BN_CTX_get(ctx);
+    s = BN_CTX_get(ctx);
+    t = BN_CTX_get(ctx);
+    if (t == NULL)
+        goto err;
+
+    if (a->Z_is_one) {
+        if (!BN_copy(x0, &a->X))
+            goto err;
+        if (!BN_copy(y0, &a->Y))
+            goto err;
+    } else {
+        if (!EC_POINT_get_affine_coordinates_GF2m(group, a, x0, y0, ctx))
+            goto err;
+    }
+    if (b->Z_is_one) {
+        if (!BN_copy(x1, &b->X))
+            goto err;
+        if (!BN_copy(y1, &b->Y))
+            goto err;
+    } else {
+        if (!EC_POINT_get_affine_coordinates_GF2m(group, b, x1, y1, ctx))
+            goto err;
+    }
+
+    if (BN_GF2m_cmp(x0, x1)) {
+        if (!BN_GF2m_add(t, x0, x1))
+            goto err;
+        if (!BN_GF2m_add(s, y0, y1))
+            goto err;
+        if (!group->meth->field_div(group, s, s, t, ctx))
+            goto err;
+        if (!group->meth->field_sqr(group, x2, s, ctx))
+            goto err;
+        if (!BN_GF2m_add(x2, x2, &group->a))
+            goto err;
+        if (!BN_GF2m_add(x2, x2, s))
+            goto err;
+        if (!BN_GF2m_add(x2, x2, t))
+            goto err;
+    } else {
+        if (BN_GF2m_cmp(y0, y1) || BN_is_zero(x1)) {
+            if (!EC_POINT_set_to_infinity(group, r))
+                goto err;
+            ret = 1;
+            goto err;
+        }
+        if (!group->meth->field_div(group, s, y1, x1, ctx))
+            goto err;
+        if (!BN_GF2m_add(s, s, x1))
+            goto err;
+
+        if (!group->meth->field_sqr(group, x2, s, ctx))
+            goto err;
+        if (!BN_GF2m_add(x2, x2, s))
+            goto err;
+        if (!BN_GF2m_add(x2, x2, &group->a))
+            goto err;
+    }
+
+    if (!BN_GF2m_add(y2, x1, x2))
+        goto err;
+    if (!group->meth->field_mul(group, y2, y2, s, ctx))
+        goto err;
+    if (!BN_GF2m_add(y2, y2, x2))
+        goto err;
+    if (!BN_GF2m_add(y2, y2, y1))
+        goto err;
+
+    if (!EC_POINT_set_affine_coordinates_GF2m(group, r, x2, y2, ctx))
+        goto err;
+
+    ret = 1;
 
+ err:
+    BN_CTX_end(ctx);
+    if (new_ctx != NULL)
+        BN_CTX_free(new_ctx);
+    return ret;
+}
+
+/*
+ * Computes 2 * a and stores the result in r.  r could be a. Uses algorithm
+ * A.10.2 of IEEE P1363.
+ */
+int ec_GF2m_simple_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+                       BN_CTX *ctx)
+{
+    return ec_GF2m_simple_add(group, r, a, a, ctx);
+}
 
 int ec_GF2m_simple_invert(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
-	{
-	if (EC_POINT_is_at_infinity(group, point) || BN_is_zero(&point->Y))
-		/* point is its own inverse */
-		return 1;
-	
-	if (!EC_POINT_make_affine(group, point, ctx)) return 0;
-	return BN_GF2m_add(&point->Y, &point->X, &point->Y);
-	}
+{
+    if (EC_POINT_is_at_infinity(group, point) || BN_is_zero(&point->Y))
+        /* point is its own inverse */
+        return 1;
 
+    if (!EC_POINT_make_affine(group, point, ctx))
+        return 0;
+    return BN_GF2m_add(&point->Y, &point->X, &point->Y);
+}
 
 /* Indicates whether the given point is the point at infinity. */
-int ec_GF2m_simple_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
-	{
-	return BN_is_zero(&point->Z);
-	}
-
-
-/* Determines whether the given EC_POINT is an actual point on the curve defined
+int ec_GF2m_simple_is_at_infinity(const EC_GROUP *group,
+                                  const EC_POINT *point)
+{
+    return BN_is_zero(&point->Z);
+}
+
+/*-
+ * Determines whether the given EC_POINT is an actual point on the curve defined
  * in the EC_GROUP.  A point is valid if it satisfies the Weierstrass equation:
  *      y^2 + x*y = x^3 + a*x^2 + b.
  */
-int ec_GF2m_simple_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
-	{
-	int ret = -1;
-	BN_CTX *new_ctx = NULL;
-	BIGNUM *lh, *y2;
-	int (*field_mul)(const EC_GROUP *, BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *);
-	int (*field_sqr)(const EC_GROUP *, BIGNUM *, const BIGNUM *, BN_CTX *);
-
-	if (EC_POINT_is_at_infinity(group, point))
-		return 1;
-
-	field_mul = group->meth->field_mul;
-	field_sqr = group->meth->field_sqr;	
-
-	/* only support affine coordinates */
-	if (!point->Z_is_one) return -1;
-
-	if (ctx == NULL)
-		{
-		ctx = new_ctx = BN_CTX_new();
-		if (ctx == NULL)
-			return -1;
-		}
-
-	BN_CTX_start(ctx);
-	y2 = BN_CTX_get(ctx);
-	lh = BN_CTX_get(ctx);
-	if (lh == NULL) goto err;
-
-	/* We have a curve defined by a Weierstrass equation
-	 *      y^2 + x*y = x^3 + a*x^2 + b.
-	 *  <=> x^3 + a*x^2 + x*y + b + y^2 = 0
-	 *  <=> ((x + a) * x + y ) * x + b + y^2 = 0
-	 */
-	if (!BN_GF2m_add(lh, &point->X, &group->a)) goto err;
-	if (!field_mul(group, lh, lh, &point->X, ctx)) goto err;
-	if (!BN_GF2m_add(lh, lh, &point->Y)) goto err;
-	if (!field_mul(group, lh, lh, &point->X, ctx)) goto err;
-	if (!BN_GF2m_add(lh, lh, &group->b)) goto err;
-	if (!field_sqr(group, y2, &point->Y, ctx)) goto err;
-	if (!BN_GF2m_add(lh, lh, y2)) goto err;
-	ret = BN_is_zero(lh);
+int ec_GF2m_simple_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
+                               BN_CTX *ctx)
+{
+    int ret = -1;
+    BN_CTX *new_ctx = NULL;
+    BIGNUM *lh, *y2;
+    int (*field_mul) (const EC_GROUP *, BIGNUM *, const BIGNUM *,
+                      const BIGNUM *, BN_CTX *);
+    int (*field_sqr) (const EC_GROUP *, BIGNUM *, const BIGNUM *, BN_CTX *);
+
+    if (EC_POINT_is_at_infinity(group, point))
+        return 1;
+
+    field_mul = group->meth->field_mul;
+    field_sqr = group->meth->field_sqr;
+
+    /* only support affine coordinates */
+    if (!point->Z_is_one)
+        return -1;
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            return -1;
+    }
+
+    BN_CTX_start(ctx);
+    y2 = BN_CTX_get(ctx);
+    lh = BN_CTX_get(ctx);
+    if (lh == NULL)
+        goto err;
+
+    /*-
+     * We have a curve defined by a Weierstrass equation
+     *      y^2 + x*y = x^3 + a*x^2 + b.
+     *  <=> x^3 + a*x^2 + x*y + b + y^2 = 0
+     *  <=> ((x + a) * x + y ) * x + b + y^2 = 0
+     */
+    if (!BN_GF2m_add(lh, &point->X, &group->a))
+        goto err;
+    if (!field_mul(group, lh, lh, &point->X, ctx))
+        goto err;
+    if (!BN_GF2m_add(lh, lh, &point->Y))
+        goto err;
+    if (!field_mul(group, lh, lh, &point->X, ctx))
+        goto err;
+    if (!BN_GF2m_add(lh, lh, &group->b))
+        goto err;
+    if (!field_sqr(group, y2, &point->Y, ctx))
+        goto err;
+    if (!BN_GF2m_add(lh, lh, y2))
+        goto err;
+    ret = BN_is_zero(lh);
  err:
-	if (ctx) BN_CTX_end(ctx);
-	if (new_ctx) BN_CTX_free(new_ctx);
-	return ret;
-	}
-
-
-/* Indicates whether two points are equal.
+    if (ctx)
+        BN_CTX_end(ctx);
+    if (new_ctx)
+        BN_CTX_free(new_ctx);
+    return ret;
+}
+
+/*-
+ * Indicates whether two points are equal.
  * Return values:
  *  -1   error
  *   0   equal (in affine coordinates)
  *   1   not equal
  */
-int ec_GF2m_simple_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
-	{
-	BIGNUM *aX, *aY, *bX, *bY;
-	BN_CTX *new_ctx = NULL;
-	int ret = -1;
-
-	if (EC_POINT_is_at_infinity(group, a))
-		{
-		return EC_POINT_is_at_infinity(group, b) ? 0 : 1;
-		}
-
-	if (EC_POINT_is_at_infinity(group, b))
-		return 1;
-	
-	if (a->Z_is_one && b->Z_is_one)
-		{
-		return ((BN_cmp(&a->X, &b->X) == 0) && BN_cmp(&a->Y, &b->Y) == 0) ? 0 : 1;
-		}
-
-	if (ctx == NULL)
-		{
-		ctx = new_ctx = BN_CTX_new();
-		if (ctx == NULL)
-			return -1;
-		}
-
-	BN_CTX_start(ctx);
-	aX = BN_CTX_get(ctx);
-	aY = BN_CTX_get(ctx);
-	bX = BN_CTX_get(ctx);
-	bY = BN_CTX_get(ctx);
-	if (bY == NULL) goto err;
-
-	if (!EC_POINT_get_affine_coordinates_GF2m(group, a, aX, aY, ctx)) goto err;
-	if (!EC_POINT_get_affine_coordinates_GF2m(group, b, bX, bY, ctx)) goto err;
-	ret = ((BN_cmp(aX, bX) == 0) && BN_cmp(aY, bY) == 0) ? 0 : 1;
-
-  err:	
-	if (ctx) BN_CTX_end(ctx);
-	if (new_ctx) BN_CTX_free(new_ctx);
-	return ret;
-	}
+int ec_GF2m_simple_cmp(const EC_GROUP *group, const EC_POINT *a,
+                       const EC_POINT *b, BN_CTX *ctx)
+{
+    BIGNUM *aX, *aY, *bX, *bY;
+    BN_CTX *new_ctx = NULL;
+    int ret = -1;
+
+    if (EC_POINT_is_at_infinity(group, a)) {
+        return EC_POINT_is_at_infinity(group, b) ? 0 : 1;
+    }
+
+    if (EC_POINT_is_at_infinity(group, b))
+        return 1;
+
+    if (a->Z_is_one && b->Z_is_one) {
+        return ((BN_cmp(&a->X, &b->X) == 0)
+                && BN_cmp(&a->Y, &b->Y) == 0) ? 0 : 1;
+    }
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            return -1;
+    }
+
+    BN_CTX_start(ctx);
+    aX = BN_CTX_get(ctx);
+    aY = BN_CTX_get(ctx);
+    bX = BN_CTX_get(ctx);
+    bY = BN_CTX_get(ctx);
+    if (bY == NULL)
+        goto err;
+
+    if (!EC_POINT_get_affine_coordinates_GF2m(group, a, aX, aY, ctx))
+        goto err;
+    if (!EC_POINT_get_affine_coordinates_GF2m(group, b, bX, bY, ctx))
+        goto err;
+    ret = ((BN_cmp(aX, bX) == 0) && BN_cmp(aY, bY) == 0) ? 0 : 1;
 
+ err:
+    if (ctx)
+        BN_CTX_end(ctx);
+    if (new_ctx)
+        BN_CTX_free(new_ctx);
+    return ret;
+}
 
 /* Forces the given EC_POINT to internally use affine coordinates. */
-int ec_GF2m_simple_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
-	{
-	BN_CTX *new_ctx = NULL;
-	BIGNUM *x, *y;
-	int ret = 0;
-
-	if (point->Z_is_one || EC_POINT_is_at_infinity(group, point))
-		return 1;
-	
-	if (ctx == NULL)
-		{
-		ctx = new_ctx = BN_CTX_new();
-		if (ctx == NULL)
-			return 0;
-		}
-
-	BN_CTX_start(ctx);
-	x = BN_CTX_get(ctx);
-	y = BN_CTX_get(ctx);
-	if (y == NULL) goto err;
-	
-	if (!EC_POINT_get_affine_coordinates_GF2m(group, point, x, y, ctx)) goto err;
-	if (!BN_copy(&point->X, x)) goto err;
-	if (!BN_copy(&point->Y, y)) goto err;
-	if (!BN_one(&point->Z)) goto err;
-	
-	ret = 1;		
-
-  err:
-	if (ctx) BN_CTX_end(ctx);
-	if (new_ctx) BN_CTX_free(new_ctx);
-	return ret;
-	}
-
-
-/* Forces each of the EC_POINTs in the given array to use affine coordinates. */
-int ec_GF2m_simple_points_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
-	{
-	size_t i;
-
-	for (i = 0; i < num; i++)
-		{
-		if (!group->meth->make_affine(group, points[i], ctx)) return 0;
-		}
-
-	return 1;
-	}
+int ec_GF2m_simple_make_affine(const EC_GROUP *group, EC_POINT *point,
+                               BN_CTX *ctx)
+{
+    BN_CTX *new_ctx = NULL;
+    BIGNUM *x, *y;
+    int ret = 0;
+
+    if (point->Z_is_one || EC_POINT_is_at_infinity(group, point))
+        return 1;
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL)
+            return 0;
+    }
+
+    BN_CTX_start(ctx);
+    x = BN_CTX_get(ctx);
+    y = BN_CTX_get(ctx);
+    if (y == NULL)
+        goto err;
+
+    if (!EC_POINT_get_affine_coordinates_GF2m(group, point, x, y, ctx))
+        goto err;
+    if (!BN_copy(&point->X, x))
+        goto err;
+    if (!BN_copy(&point->Y, y))
+        goto err;
+    if (!BN_one(&point->Z))
+        goto err;
+
+    ret = 1;
 
+ err:
+    if (ctx)
+        BN_CTX_end(ctx);
+    if (new_ctx)
+        BN_CTX_free(new_ctx);
+    return ret;
+}
+
+/*
+ * Forces each of the EC_POINTs in the given array to use affine coordinates.
+ */
+int ec_GF2m_simple_points_make_affine(const EC_GROUP *group, size_t num,
+                                      EC_POINT *points[], BN_CTX *ctx)
+{
+    size_t i;
 
-/* Wrapper to simple binary polynomial field multiplication implementation. */
-int ec_GF2m_simple_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
-	{
-	return BN_GF2m_mod_mul_arr(r, a, b, group->poly, ctx);
-	}
+    for (i = 0; i < num; i++) {
+        if (!group->meth->make_affine(group, points[i], ctx))
+            return 0;
+    }
 
+    return 1;
+}
 
-/* Wrapper to simple binary polynomial field squaring implementation. */
-int ec_GF2m_simple_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
-	{
-	return BN_GF2m_mod_sqr_arr(r, a, group->poly, ctx);
-	}
+/* Wrapper to simple binary polynomial field multiplication implementation. */
+int ec_GF2m_simple_field_mul(const EC_GROUP *group, BIGNUM *r,
+                             const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+{
+    return BN_GF2m_mod_mul_arr(r, a, b, group->poly, ctx);
+}
 
+/* Wrapper to simple binary polynomial field squaring implementation. */
+int ec_GF2m_simple_field_sqr(const EC_GROUP *group, BIGNUM *r,
+                             const BIGNUM *a, BN_CTX *ctx)
+{
+    return BN_GF2m_mod_sqr_arr(r, a, group->poly, ctx);
+}
 
 /* Wrapper to simple binary polynomial field division implementation. */
-int ec_GF2m_simple_field_div(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
-	{
-	return BN_GF2m_mod_div(r, a, b, &group->field, ctx);
-	}
+int ec_GF2m_simple_field_div(const EC_GROUP *group, BIGNUM *r,
+                             const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+{
+    return BN_GF2m_mod_div(r, a, b, &group->field, ctx);
+}
 
 #endif