/*

 * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "internal/nelem.h"

#include "testutil.h"

#ifndef OPENSSL_NO_EC

# include <openssl/ec.h>

# ifndef OPENSSL_NO_ENGINE

#  include <openssl/engine.h>

# endif

# include <openssl/err.h>

# include <openssl/obj_mac.h>

# include <openssl/objects.h>

# include <openssl/rand.h>

# include <openssl/bn.h>

# include <openssl/opensslconf.h>

static size_t crv_len = 0;

static EC_builtin_curve *curves = NULL;

/* test multiplication with group order, long and negative scalars */

static int group_order_tests(EC_GROUP *group)

{

    BIGNUM *n1 = NULL, *n2 = NULL, *order = NULL;

    EC_POINT *P = NULL, *Q = NULL, *R = NULL, *S = NULL;

    const EC_POINT *G = NULL;

    BN_CTX *ctx = NULL;

    int i = 0, r = 0;

    if (!TEST_ptr(n1 = BN_new())

        || !TEST_ptr(n2 = BN_new())

        || !TEST_ptr(order = BN_new())

        || !TEST_ptr(ctx = BN_CTX_new())

        || !TEST_ptr(G = EC_GROUP_get0_generator(group))

        || !TEST_ptr(P = EC_POINT_new(group))

        || !TEST_ptr(Q = EC_POINT_new(group))

        || !TEST_ptr(R = EC_POINT_new(group))

        || !TEST_ptr(S = EC_POINT_new(group)))

        goto err;

    if (!TEST_true(EC_GROUP_get_order(group, order, ctx))

        || !TEST_true(EC_POINT_mul(group, Q, order, NULL, NULL, ctx))

        || !TEST_true(EC_POINT_is_at_infinity(group, Q))

        || !TEST_true(EC_GROUP_precompute_mult(group, ctx))

        || !TEST_true(EC_POINT_mul(group, Q, order, NULL, NULL, ctx))

        || !TEST_true(EC_POINT_is_at_infinity(group, Q))

        || !TEST_true(EC_POINT_copy(P, G))

        || !TEST_true(BN_one(n1))

        || !TEST_true(EC_POINT_mul(group, Q, n1, NULL, NULL, ctx))

        || !TEST_int_eq(0, EC_POINT_cmp(group, Q, P, ctx))

        || !TEST_true(BN_sub(n1, order, n1))

        || !TEST_true(EC_POINT_mul(group, Q, n1, NULL, NULL, ctx))

        || !TEST_true(EC_POINT_invert(group, Q, ctx))

        || !TEST_int_eq(0, EC_POINT_cmp(group, Q, P, ctx)))

        goto err;

    for (i = 1; i <= 2; i++) {

        const BIGNUM *scalars[6];

        const EC_POINT *points[6];

        if (!TEST_true(BN_set_word(n1, i))

            /*

             * If i == 1, P will be the predefined generator for which

             * EC_GROUP_precompute_mult has set up precomputation.

             */

            || !TEST_true(EC_POINT_mul(group, P, n1, NULL, NULL, ctx))

            || (i == 1 && !TEST_int_eq(0, EC_POINT_cmp(group, P, G, ctx)))

            || !TEST_true(BN_one(n1))

            /* n1 = 1 - order */

            || !TEST_true(BN_sub(n1, n1, order))

            || !TEST_true(EC_POINT_mul(group, Q, NULL, P, n1, ctx))

            || !TEST_int_eq(0, EC_POINT_cmp(group, Q, P, ctx))

            /* n2 = 1 + order */

            || !TEST_true(BN_add(n2, order, BN_value_one()))

            || !TEST_true(EC_POINT_mul(group, Q, NULL, P, n2, ctx))

            || !TEST_int_eq(0, EC_POINT_cmp(group, Q, P, ctx))

            /* n2 = (1 - order) * (1 + order) = 1 - order^2 */

            || !TEST_true(BN_mul(n2, n1, n2, ctx))

            || !TEST_true(EC_POINT_mul(group, Q, NULL, P, n2, ctx))

            || !TEST_int_eq(0, EC_POINT_cmp(group, Q, P, ctx)))

            goto err;

        /* n2 = order^2 - 1 */

        BN_set_negative(n2, 0);

        if (!TEST_true(EC_POINT_mul(group, Q, NULL, P, n2, ctx))

            /* Add P to verify the result. */

            || !TEST_true(EC_POINT_add(group, Q, Q, P, ctx))

            || !TEST_true(EC_POINT_is_at_infinity(group, Q))

            /* Exercise EC_POINTs_mul, including corner cases. */

            || !TEST_false(EC_POINT_is_at_infinity(group, P)))

            goto err;

        scalars[0] = scalars[1] = BN_value_one();

        points[0]  = points[1]  = P;

        if (!TEST_true(EC_POINTs_mul(group, R, NULL, 2, points, scalars, ctx))

            || !TEST_true(EC_POINT_dbl(group, S, points[0], ctx))

            || !TEST_int_eq(0, EC_POINT_cmp(group, R, S, ctx)))

            goto err;

        scalars[0] = n1;

        points[0] = Q;          /* => infinity */

        scalars[1] = n2;

        points[1] = P;          /* => -P */

        scalars[2] = n1;

        points[2] = Q;          /* => infinity */

        scalars[3] = n2;

        points[3] = Q;          /* => infinity */

        scalars[4] = n1;

        points[4] = P;          /* => P */

        scalars[5] = n2;

        points[5] = Q;          /* => infinity */

        if (!TEST_true(EC_POINTs_mul(group, P, NULL, 6, points, scalars, ctx))

            || !TEST_true(EC_POINT_is_at_infinity(group, P)))

            goto err;

    }

    r = 1;

err:

    if (r == 0 && i != 0)

        TEST_info(i == 1 ? "allowing precomputation" :

                           "without precomputation");

    EC_POINT_free(P);

    EC_POINT_free(Q);

    EC_POINT_free(R);

    EC_POINT_free(S);

    BN_free(n1);

    BN_free(n2);

    BN_free(order);

    BN_CTX_free(ctx);

    return r;

}

static int prime_field_tests(void)

{

    BN_CTX *ctx = NULL;

    BIGNUM *p = NULL, *a = NULL, *b = NULL, *scalar3 = NULL;

    EC_GROUP *group = NULL, *tmp = NULL;

    EC_GROUP *P_160 = NULL, *P_192 = NULL, *P_224 = NULL,

             *P_256 = NULL, *P_384 = NULL, *P_521 = NULL;

    EC_POINT *P = NULL, *Q = NULL, *R = NULL;

    BIGNUM *x = NULL, *y = NULL, *z = NULL, *yplusone = NULL;

    const EC_POINT *points[4];

    const BIGNUM *scalars[4];

    unsigned char buf[100];

    size_t len, r = 0;

    int k;

    if (!TEST_ptr(ctx = BN_CTX_new())

        || !TEST_ptr(p = BN_new())

        || !TEST_ptr(a = BN_new())

        || !TEST_ptr(b = BN_new())

        /*

         * applications should use EC_GROUP_new_curve_GFp so

         * that the library gets to choose the EC_METHOD

         */

        || !TEST_ptr(group = EC_GROUP_new(EC_GFp_mont_method()))

        || !TEST_ptr(tmp = EC_GROUP_new(EC_GROUP_method_of(group)))

        || !TEST_true(EC_GROUP_copy(tmp, group)))

        goto err;

    EC_GROUP_free(group);

    group = tmp;

    tmp = NULL;

    buf[0] = 0;

    if (!TEST_ptr(P = EC_POINT_new(group))

        || !TEST_ptr(Q = EC_POINT_new(group))

        || !TEST_ptr(R = EC_POINT_new(group))

        || !TEST_ptr(x = BN_new())

        || !TEST_ptr(y = BN_new())

        || !TEST_ptr(z = BN_new())

        || !TEST_ptr(yplusone = BN_new()))

        goto err;

    /* Curve P-224 (FIPS PUB 186-2, App. 6) */

    if (!TEST_true(BN_hex2bn(&p,         "FFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFF000000000000000000000001"))

        || !TEST_int_eq(1, BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))

        || !TEST_true(BN_hex2bn(&a,         "FFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE"))

        || !TEST_true(BN_hex2bn(&b,         "B4050A850C04B3ABF5413256"

                                    "5044B0B7D7BFD8BA270B39432355FFB4"))

        || !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx))

        || !TEST_true(BN_hex2bn(&x,         "B70E0CBD6BB4BF7F321390B9"

                                    "4A03C1D356C21122343280D6115C1D21"))

        || !TEST_true(EC_POINT_set_compressed_coordinates(group, P, x, 0, ctx))

        || !TEST_int_gt(EC_POINT_is_on_curve(group, P, ctx), 0)

        || !TEST_true(BN_hex2bn(&z,         "FFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFF16A2E0B8F03E13DD29455C5C2A3D"))

        || !TEST_true(EC_GROUP_set_generator(group, P, z, BN_value_one()))

        || !TEST_true(EC_POINT_get_affine_coordinates(group, P, x, y, ctx)))

        goto err;

    TEST_info("NIST curve P-224 -- Generator");

    test_output_bignum("x", x);

    test_output_bignum("y", y);

    /* G_y value taken from the standard: */

    if (!TEST_true(BN_hex2bn(&z,         "BD376388B5F723FB4C22DFE6"

                                 "CD4375A05A07476444D5819985007E34"))

        || !TEST_BN_eq(y, z)

        || !TEST_true(BN_add(yplusone, y, BN_value_one()))

    /*

     * When (x, y) is on the curve, (x, y + 1) is, as it happens, not,

     * and therefore setting the coordinates should fail.

     */

        || !TEST_false(EC_POINT_set_affine_coordinates(group, P, x, yplusone,

                                                       ctx))

        || !TEST_int_eq(EC_GROUP_get_degree(group), 224)

        || !group_order_tests(group)

        || !TEST_ptr(P_224 = EC_GROUP_new(EC_GROUP_method_of(group)))

        || !TEST_true(EC_GROUP_copy(P_224, group))

    /* Curve P-256 (FIPS PUB 186-2, App. 6) */

        || !TEST_true(BN_hex2bn(&p, "FFFFFFFF000000010000000000000000"

                                    "00000000FFFFFFFFFFFFFFFFFFFFFFFF"))

        || !TEST_int_eq(1, BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))

        || !TEST_true(BN_hex2bn(&a, "FFFFFFFF000000010000000000000000"

                                    "00000000FFFFFFFFFFFFFFFFFFFFFFFC"))

        || !TEST_true(BN_hex2bn(&b, "5AC635D8AA3A93E7B3EBBD55769886BC"

                                    "651D06B0CC53B0F63BCE3C3E27D2604B"))

        || !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx))

        || !TEST_true(BN_hex2bn(&x, "6B17D1F2E12C4247F8BCE6E563A440F2"

                                    "77037D812DEB33A0F4A13945D898C296"))

        || !TEST_true(EC_POINT_set_compressed_coordinates(group, P, x, 1, ctx))

        || !TEST_int_gt(EC_POINT_is_on_curve(group, P, ctx), 0)

        || !TEST_true(BN_hex2bn(&z, "FFFFFFFF00000000FFFFFFFFFFFFFFFF"

                                    "BCE6FAADA7179E84F3B9CAC2FC632551"))

        || !TEST_true(EC_GROUP_set_generator(group, P, z, BN_value_one()))

        || !TEST_true(EC_POINT_get_affine_coordinates(group, P, x, y, ctx)))

        goto err;

    TEST_info("NIST curve P-256 -- Generator");

    test_output_bignum("x", x);

    test_output_bignum("y", y);

    /* G_y value taken from the standard: */

    if (!TEST_true(BN_hex2bn(&z, "4FE342E2FE1A7F9B8EE7EB4A7C0F9E16"

                                 "2BCE33576B315ECECBB6406837BF51F5"))

        || !TEST_BN_eq(y, z)

        || !TEST_true(BN_add(yplusone, y, BN_value_one()))

    /*

     * When (x, y) is on the curve, (x, y + 1) is, as it happens, not,

     * and therefore setting the coordinates should fail.

     */

        || !TEST_false(EC_POINT_set_affine_coordinates(group, P, x, yplusone,

                                                       ctx))

        || !TEST_int_eq(EC_GROUP_get_degree(group), 256)

        || !group_order_tests(group)

        || !TEST_ptr(P_256 = EC_GROUP_new(EC_GROUP_method_of(group)))

        || !TEST_true(EC_GROUP_copy(P_256, group))

    /* Curve P-384 (FIPS PUB 186-2, App. 6) */

        || !TEST_true(BN_hex2bn(&p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE"

                                    "FFFFFFFF0000000000000000FFFFFFFF"))

        || !TEST_int_eq(1, BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))

        || !TEST_true(BN_hex2bn(&a, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE"

                                    "FFFFFFFF0000000000000000FFFFFFFC"))

        || !TEST_true(BN_hex2bn(&b, "B3312FA7E23EE7E4988E056BE3F82D19"

                                    "181D9C6EFE8141120314088F5013875A"

                                    "C656398D8A2ED19D2A85C8EDD3EC2AEF"))

        || !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx))

        || !TEST_true(BN_hex2bn(&x, "AA87CA22BE8B05378EB1C71EF320AD74"

                                    "6E1D3B628BA79B9859F741E082542A38"

                                    "5502F25DBF55296C3A545E3872760AB7"))

        || !TEST_true(EC_POINT_set_compressed_coordinates(group, P, x, 1, ctx))

        || !TEST_int_gt(EC_POINT_is_on_curve(group, P, ctx), 0)

        || !TEST_true(BN_hex2bn(&z, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFC7634D81F4372DDF"

                                    "581A0DB248B0A77AECEC196ACCC52973"))

        || !TEST_true(EC_GROUP_set_generator(group, P, z, BN_value_one()))

        || !TEST_true(EC_POINT_get_affine_coordinates(group, P, x, y, ctx)))

        goto err;

    TEST_info("NIST curve P-384 -- Generator");

    test_output_bignum("x", x);

    test_output_bignum("y", y);

    /* G_y value taken from the standard: */

    if (!TEST_true(BN_hex2bn(&z, "3617DE4A96262C6F5D9E98BF9292DC29"

                                 "F8F41DBD289A147CE9DA3113B5F0B8C0"

                                 "0A60B1CE1D7E819D7A431D7C90EA0E5F"))

        || !TEST_BN_eq(y, z)

        || !TEST_true(BN_add(yplusone, y, BN_value_one()))

    /*

     * When (x, y) is on the curve, (x, y + 1) is, as it happens, not,

     * and therefore setting the coordinates should fail.

     */

        || !TEST_false(EC_POINT_set_affine_coordinates(group, P, x, yplusone,

                                                       ctx))

        || !TEST_int_eq(EC_GROUP_get_degree(group), 384)

        || !group_order_tests(group)

        || !TEST_ptr(P_384 = EC_GROUP_new(EC_GROUP_method_of(group)))

        || !TEST_true(EC_GROUP_copy(P_384, group))

    /* Curve P-521 (FIPS PUB 186-2, App. 6) */

        || !TEST_true(BN_hex2bn(&p,                              "1FF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"))

        || !TEST_int_eq(1, BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))

        || !TEST_true(BN_hex2bn(&a,                              "1FF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC"))

        || !TEST_true(BN_hex2bn(&b,                              "051"

                                    "953EB9618E1C9A1F929A21A0B68540EE"

                                    "A2DA725B99B315F3B8B489918EF109E1"

                                    "56193951EC7E937B1652C0BD3BB1BF07"

                                    "3573DF883D2C34F1EF451FD46B503F00"))

        || !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx))

        || !TEST_true(BN_hex2bn(&x,                               "C6"

                                    "858E06B70404E9CD9E3ECB662395B442"

                                    "9C648139053FB521F828AF606B4D3DBA"

                                    "A14B5E77EFE75928FE1DC127A2FFA8DE"

                                    "3348B3C1856A429BF97E7E31C2E5BD66"))

        || !TEST_true(EC_POINT_set_compressed_coordinates(group, P, x, 0, ctx))

        || !TEST_int_gt(EC_POINT_is_on_curve(group, P, ctx), 0)

        || !TEST_true(BN_hex2bn(&z,                              "1FF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"

                                    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA"

                                    "51868783BF2F966B7FCC0148F709A5D0"

                                    "3BB5C9B8899C47AEBB6FB71E91386409"))

        || !TEST_true(EC_GROUP_set_generator(group, P, z, BN_value_one()))

        || !TEST_true(EC_POINT_get_affine_coordinates(group, P, x, y, ctx)))

        goto err;

    TEST_info("NIST curve P-521 -- Generator");

    test_output_bignum("x", x);

    test_output_bignum("y", y);

    /* G_y value taken from the standard: */

    if (!TEST_true(BN_hex2bn(&z,                              "118"

                                 "39296A789A3BC0045C8A5FB42C7D1BD9"

                                 "98F54449579B446817AFBD17273E662C"

                                 "97EE72995EF42640C550B9013FAD0761"

                                 "353C7086A272C24088BE94769FD16650"))

        || !TEST_BN_eq(y, z)

        || !TEST_true(BN_add(yplusone, y, BN_value_one()))

    /*

     * When (x, y) is on the curve, (x, y + 1) is, as it happens, not,

     * and therefore setting the coordinates should fail.

     */

        || !TEST_false(EC_POINT_set_affine_coordinates(group, P, x, yplusone,

                                                       ctx))

        || !TEST_int_eq(EC_GROUP_get_degree(group), 521)

        || !group_order_tests(group)

        || !TEST_ptr(P_521 = EC_GROUP_new(EC_GROUP_method_of(group)))

        || !TEST_true(EC_GROUP_copy(P_521, group))

    /* more tests using the last curve */

    /* Restore the point that got mangled in the (x, y + 1) test. */

        || !TEST_true(EC_POINT_set_affine_coordinates(group, P, x, y, ctx))

        || !TEST_true(EC_POINT_copy(Q, P))

        || !TEST_false(EC_POINT_is_at_infinity(group, Q))

        || !TEST_true(EC_POINT_dbl(group, P, P, ctx))

        || !TEST_int_gt(EC_POINT_is_on_curve(group, P, ctx), 0)

        || !TEST_true(EC_POINT_invert(group, Q, ctx))       /* P = -2Q */

        || !TEST_true(EC_POINT_add(group, R, P, Q, ctx))

        || !TEST_true(EC_POINT_add(group, R, R, Q, ctx))

        || !TEST_true(EC_POINT_is_at_infinity(group, R))    /* R = P + 2Q */

        || !TEST_false(EC_POINT_is_at_infinity(group, Q)))

        goto err;

    points[0] = Q;

    points[1] = Q;

    points[2] = Q;

    points[3] = Q;

    if (!TEST_true(EC_GROUP_get_order(group, z, ctx))

        || !TEST_true(BN_add(y, z, BN_value_one()))

        || !TEST_BN_even(y)

        || !TEST_true(BN_rshift1(y, y)))

        goto err;

    scalars[0] = y;         /* (group order + 1)/2, so y*Q + y*Q = Q */

    scalars[1] = y;

    TEST_note("combined multiplication ...");

    /* z is still the group order */

    if (!TEST_true(EC_POINTs_mul(group, P, NULL, 2, points, scalars, ctx))

        || !TEST_true(EC_POINTs_mul(group, R, z, 2, points, scalars, ctx))

        || !TEST_int_eq(0, EC_POINT_cmp(group, P, R, ctx))

        || !TEST_int_eq(0, EC_POINT_cmp(group, R, Q, ctx))

        || !TEST_true(BN_rand(y, BN_num_bits(y), 0, 0))

        || !TEST_true(BN_add(z, z, y)))

        goto err;

    BN_set_negative(z, 1);

    scalars[0] = y;

    scalars[1] = z;         /* z = -(order + y) */

    if (!TEST_true(EC_POINTs_mul(group, P, NULL, 2, points, scalars, ctx))

        || !TEST_true(EC_POINT_is_at_infinity(group, P))

        || !TEST_true(BN_rand(x, BN_num_bits(y) - 1, 0, 0))

        || !TEST_true(BN_add(z, x, y)))

        goto err;

    BN_set_negative(z, 1);

    scalars[0] = x;

    scalars[1] = y;

    scalars[2] = z;         /* z = -(x+y) */

    if (!TEST_ptr(scalar3 = BN_new()))

        goto err;

    BN_zero(scalar3);

    scalars[3] = scalar3;

    if (!TEST_true(EC_POINTs_mul(group, P, NULL, 4, points, scalars, ctx))

        || !TEST_true(EC_POINT_is_at_infinity(group, P)))

        goto err;

    TEST_note(" ok\n");

    r = 1;

err:

    BN_CTX_free(ctx);

    BN_free(p);

    BN_free(a);

    BN_free(b);

    EC_GROUP_free(group);

    EC_GROUP_free(tmp);

    EC_POINT_free(P);

    EC_POINT_free(Q);

    EC_POINT_free(R);

    BN_free(x);

    BN_free(y);

    BN_free(z);

    BN_free(yplusone);

    BN_free(scalar3);

    EC_GROUP_free(P_224);

    EC_GROUP_free(P_256);

    EC_GROUP_free(P_384);

    EC_GROUP_free(P_521);

    return r;

}

static int internal_curve_test(int n)

{

    EC_GROUP *group = NULL;

    int nid = curves[n].nid;

    if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))) {

        TEST_info("EC_GROUP_new_curve_name() failed with curve %s\n",

                  OBJ_nid2sn(nid));

        return 0;

    }

    if (!TEST_true(EC_GROUP_check(group, NULL))) {

        TEST_info("EC_GROUP_check() failed with curve %s\n", OBJ_nid2sn(nid));

        EC_GROUP_free(group);

        return 0;

    }

    EC_GROUP_free(group);

    return 1;

}

static int internal_curve_test_method(int n)

{

    int r, nid = curves[n].nid;

    EC_GROUP *group;

    if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))) {

        TEST_info("Curve %s failed\n", OBJ_nid2sn(nid));

        return 0;

    }

    r = group_order_tests(group);

    EC_GROUP_free(group);

    return r;

}

# ifndef OPENSSL_NO_EC_NISTP_64_GCC_128

/*

 * nistp_test_params contains magic numbers for testing our optimized

 * implementations of several NIST curves with characteristic > 3.

 */

struct nistp_test_params {

    const EC_METHOD *(*meth) (void);

    int degree;

    /*

     * Qx, Qy and D are taken from

     * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/ECDSA_Prime.pdf

     * Otherwise, values are standard curve parameters from FIPS 180-3

     */

    const char *p, *a, *b, *Qx, *Qy, *Gx, *Gy, *order, *d;

};

static const struct nistp_test_params nistp_tests_params[] = {

    {

     /* P-224 */

     EC_GFp_nistp224_method,

     224,

     /* p */

     "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001",

     /* a */

     "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE",

     /* b */

     "B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4",

     /* Qx */

     "E84FB0B8E7000CB657D7973CF6B42ED78B301674276DF744AF130B3E",

     /* Qy */

     "4376675C6FC5612C21A0FF2D2A89D2987DF7A2BC52183B5982298555",

     /* Gx */

     "B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21",

     /* Gy */

     "BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34",

     /* order */

     "FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D",

     /* d */

     "3F0C488E987C80BE0FEE521F8D90BE6034EC69AE11CA72AA777481E8",

     },

    {

     /* P-256 */

     EC_GFp_nistp256_method,

     256,

     /* p */

     "ffffffff00000001000000000000000000000000ffffffffffffffffffffffff",

     /* a */

     "ffffffff00000001000000000000000000000000fffffffffffffffffffffffc",

     /* b */

     "5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b",

     /* Qx */

     "b7e08afdfe94bad3f1dc8c734798ba1c62b3a0ad1e9ea2a38201cd0889bc7a19",

     /* Qy */

     "3603f747959dbf7a4bb226e41928729063adc7ae43529e61b563bbc606cc5e09",

     /* Gx */

     "6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",

     /* Gy */

     "4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5",

     /* order */

     "ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",

     /* d */

     "c477f9f65c22cce20657faa5b2d1d8122336f851a508a1ed04e479c34985bf96",

     },

    {

     /* P-521 */

     EC_GFp_nistp521_method,

     521,

     /* p */

                                                                  "1ff"

     "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"

     "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",

     /* a */

                                                                  "1ff"

     "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"

     "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffc",

     /* b */

                                                                  "051"

     "953eb9618e1c9a1f929a21a0b68540eea2da725b99b315f3b8b489918ef109e1"

     "56193951ec7e937b1652c0bd3bb1bf073573df883d2c34f1ef451fd46b503f00",

     /* Qx */

                                                                 "0098"

     "e91eef9a68452822309c52fab453f5f117c1da8ed796b255e9ab8f6410cca16e"

     "59df403a6bdc6ca467a37056b1e54b3005d8ac030decfeb68df18b171885d5c4",

     /* Qy */

                                                                 "0164"

     "350c321aecfc1cca1ba4364c9b15656150b4b78d6a48d7d28e7f31985ef17be8"

     "554376b72900712c4b83ad668327231526e313f5f092999a4632fd50d946bc2e",

     /* Gx */

                                                                   "c6"

     "858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d3dba"

     "a14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66",

     /* Gy */

                                                                  "118"

     "39296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e662c"

     "97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16650",

     /* order */

                                                                  "1ff"

     "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa"

     "51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409",

     /* d */

                                                                 "0100"

     "085f47b8e1b8b11b7eb33028c0b2888e304bfc98501955b45bba1478dc184eee"

     "df09b86a5f7c21994406072787205e69a63709fe35aa93ba333514b24f961722",

     },

};

static int nistp_single_test(int idx)

{

    const struct nistp_test_params *test = nistp_tests_params + idx;

    BN_CTX *ctx = NULL;

    BIGNUM *p = NULL, *a = NULL, *b = NULL, *x = NULL, *y = NULL;

    BIGNUM *n = NULL, *m = NULL, *order = NULL, *yplusone = NULL;

    EC_GROUP *NISTP = NULL;

    EC_POINT *G = NULL, *P = NULL, *Q = NULL, *Q_CHECK = NULL;

    int r = 0;

    TEST_note("NIST curve P-%d (optimised implementation):",

              test->degree);

    if (!TEST_ptr(ctx = BN_CTX_new())

        || !TEST_ptr(p = BN_new())

        || !TEST_ptr(a = BN_new())

        || !TEST_ptr(b = BN_new())

        || !TEST_ptr(x = BN_new())

        || !TEST_ptr(y = BN_new())

        || !TEST_ptr(m = BN_new())

        || !TEST_ptr(n = BN_new())

        || !TEST_ptr(order = BN_new())

        || !TEST_ptr(yplusone = BN_new())

        || !TEST_ptr(NISTP = EC_GROUP_new(test->meth()))

        || !TEST_true(BN_hex2bn(&p, test->p))

        || !TEST_int_eq(1, BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))

        || !TEST_true(BN_hex2bn(&a, test->a))

        || !TEST_true(BN_hex2bn(&b, test->b))

        || !TEST_true(EC_GROUP_set_curve(NISTP, p, a, b, ctx))

        || !TEST_ptr(G = EC_POINT_new(NISTP))

        || !TEST_ptr(P = EC_POINT_new(NISTP))

        || !TEST_ptr(Q = EC_POINT_new(NISTP))

        || !TEST_ptr(Q_CHECK = EC_POINT_new(NISTP))

        || !TEST_true(BN_hex2bn(&x, test->Qx))

        || !TEST_true(BN_hex2bn(&y, test->Qy))

        || !TEST_true(BN_add(yplusone, y, BN_value_one()))

    /*

     * When (x, y) is on the curve, (x, y + 1) is, as it happens, not,

     * and therefore setting the coordinates should fail.

     */

        || !TEST_false(EC_POINT_set_affine_coordinates(NISTP, Q_CHECK, x,

                                                       yplusone, ctx))

        || !TEST_true(EC_POINT_set_affine_coordinates(NISTP, Q_CHECK, x, y,

                                                      ctx))

        || !TEST_true(BN_hex2bn(&x, test->Gx))

        || !TEST_true(BN_hex2bn(&y, test->Gy))

        || !TEST_true(EC_POINT_set_affine_coordinates(NISTP, G, x, y, ctx))

        || !TEST_true(BN_hex2bn(&order, test->order))

        || !TEST_true(EC_GROUP_set_generator(NISTP, G, order, BN_value_one()))

        || !TEST_int_eq(EC_GROUP_get_degree(NISTP), test->degree))

        goto err;

    TEST_note("NIST test vectors ... ");

    if (!TEST_true(BN_hex2bn(&n, test->d)))

        goto err;

    /* fixed point multiplication */

    EC_POINT_mul(NISTP, Q, n, NULL, NULL, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx)))

        goto err;

    /* random point multiplication */

    EC_POINT_mul(NISTP, Q, NULL, G, n, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx))

        /* set generator to P = 2*G, where G is the standard generator */

        || !TEST_true(EC_POINT_dbl(NISTP, P, G, ctx))

        || !TEST_true(EC_GROUP_set_generator(NISTP, P, order, BN_value_one()))

        /* set the scalar to m=n/2, where n is the NIST test scalar */

        || !TEST_true(BN_rshift(m, n, 1)))

        goto err;

    /* test the non-standard generator */

    /* fixed point multiplication */

    EC_POINT_mul(NISTP, Q, m, NULL, NULL, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx)))

        goto err;

    /* random point multiplication */

    EC_POINT_mul(NISTP, Q, NULL, P, m, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx))

    /*

     * We have not performed precomputation so have_precompute mult should be

     * false

     */

        || !TEST_false(EC_GROUP_have_precompute_mult(NISTP))

    /* now repeat all tests with precomputation */

        || !TEST_true(EC_GROUP_precompute_mult(NISTP, ctx))

        || !TEST_true(EC_GROUP_have_precompute_mult(NISTP)))

        goto err;

    /* fixed point multiplication */

    EC_POINT_mul(NISTP, Q, m, NULL, NULL, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx)))

        goto err;

    /* random point multiplication */

    EC_POINT_mul(NISTP, Q, NULL, P, m, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx))

    /* reset generator */

        || !TEST_true(EC_GROUP_set_generator(NISTP, G, order, BN_value_one())))

        goto err;

    /* fixed point multiplication */

    EC_POINT_mul(NISTP, Q, n, NULL, NULL, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx)))

        goto err;

    /* random point multiplication */

    EC_POINT_mul(NISTP, Q, NULL, G, n, ctx);

    if (!TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, Q_CHECK, ctx)))

        goto err;

    /* regression test for felem_neg bug */

    if (!TEST_true(BN_set_word(m, 32))

        || !TEST_true(BN_set_word(n, 31))

        || !TEST_true(EC_POINT_copy(P, G))

        || !TEST_true(EC_POINT_invert(NISTP, P, ctx))

        || !TEST_true(EC_POINT_mul(NISTP, Q, m, P, n, ctx))

        || !TEST_int_eq(0, EC_POINT_cmp(NISTP, Q, G, ctx)))

      goto err;

    r = group_order_tests(NISTP);

err:

    EC_GROUP_free(NISTP);

    EC_POINT_free(G);

    EC_POINT_free(P);