int BN_hex2bn(BIGNUM **bn, const char *a)
{
    BIGNUM *ret = NULL;
    BN_ULONG l = 0;
    int neg = 0, h, m, i, j, k, c;
    int num;
    if ((a == NULL) || (*a == '\0'))
        return (0);
    if (*a == '-') {
        neg = 1;
        a++;
    }
    for (i = 0; isxdigit((unsigned char)a[i]); i++) ;
    num = i + neg;
    if (bn == NULL)
        return (num);
    if (*bn == NULL) {
        if ((ret = BN_new()) == NULL)
            return (0);
    } else {
        ret = *bn;
        BN_zero(ret);
    }
    if (bn_expand(ret, i * 4) == NULL)
        goto err;
    j = i;
    m = 0;
    h = 0;
    while (j > 0) {
        m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;
        l = 0;
        for (;;) {
            c = a[j - m];
            if ((c >= '0') && (c <= '9'))
                k = c - '0';
            else if ((c >= 'a') && (c <= 'f'))
                k = c - 'a' + 10;
            else if ((c >= 'A') && (c <= 'F'))
                k = c - 'A' + 10;
            else
                k = 0;
            l = (l << 4) | k;
            if (--m <= 0) {
                ret->d[h++] = l;
                break;
            }
        }
        j -= (BN_BYTES * 2);
    }
    ret->top = h;
    bn_correct_top(ret);
    ret->neg = neg;
    *bn = ret;
    bn_check_top(ret);
    return (num);
 err:
    if (*bn == NULL)
        BN_free(ret);
    return (0);
}
['static void prime_field_tests(void)\n{\n    BN_CTX *ctx = NULL;\n    BIGNUM *p, *a, *b;\n    EC_GROUP *group;\n    EC_GROUP *P_160 = NULL, *P_192 = NULL, *P_224 = NULL, *P_256 =\n        NULL, *P_384 = NULL, *P_521 = NULL;\n    EC_POINT *P, *Q, *R;\n    BIGNUM *x, *y, *z;\n    unsigned char buf[100];\n    size_t i, len;\n    int k;\n# if 1\n    ctx = BN_CTX_new();\n    if (!ctx)\n        ABORT;\n# endif\n    p = BN_new();\n    a = BN_new();\n    b = BN_new();\n    if (!p || !a || !b)\n        ABORT;\n    if (!BN_hex2bn(&p, "17"))\n        ABORT;\n    if (!BN_hex2bn(&a, "1"))\n        ABORT;\n    if (!BN_hex2bn(&b, "1"))\n        ABORT;\n    group = EC_GROUP_new(EC_GFp_mont_method());\n    if (!group)\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    {\n        EC_GROUP *tmp;\n        tmp = EC_GROUP_new(EC_GROUP_method_of(group));\n        if (!tmp)\n            ABORT;\n        if (!EC_GROUP_copy(tmp, group))\n            ABORT;\n        EC_GROUP_free(group);\n        group = tmp;\n    }\n    if (!EC_GROUP_get_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    fprintf(stdout,\n            "Curve defined by Weierstrass equation\\n     y^2 = x^3 + a*x + b  (mod 0x");\n    BN_print_fp(stdout, p);\n    fprintf(stdout, ")\\n     a = 0x");\n    BN_print_fp(stdout, a);\n    fprintf(stdout, "\\n     b = 0x");\n    BN_print_fp(stdout, b);\n    fprintf(stdout, "\\n");\n    P = EC_POINT_new(group);\n    Q = EC_POINT_new(group);\n    R = EC_POINT_new(group);\n    if (!P || !Q || !R)\n        ABORT;\n    if (!EC_POINT_set_to_infinity(group, P))\n        ABORT;\n    if (!EC_POINT_is_at_infinity(group, P))\n        ABORT;\n    buf[0] = 0;\n    if (!EC_POINT_oct2point(group, Q, buf, 1, ctx))\n        ABORT;\n    if (!EC_POINT_add(group, P, P, Q, ctx))\n        ABORT;\n    if (!EC_POINT_is_at_infinity(group, P))\n        ABORT;\n    x = BN_new();\n    y = BN_new();\n    z = BN_new();\n    if (!x || !y || !z)\n        ABORT;\n    if (!BN_hex2bn(&x, "D"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, Q, x, 1, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, Q, ctx)) {\n        if (!EC_POINT_get_affine_coordinates_GFp(group, Q, x, y, ctx))\n            ABORT;\n        fprintf(stderr, "Point is not on curve: x = 0x");\n        BN_print_fp(stderr, x);\n        fprintf(stderr, ", y = 0x");\n        BN_print_fp(stderr, y);\n        fprintf(stderr, "\\n");\n        ABORT;\n    }\n    fprintf(stdout, "A cyclic subgroup:\\n");\n    k = 100;\n    do {\n        if (k-- == 0)\n            ABORT;\n        if (EC_POINT_is_at_infinity(group, P))\n            fprintf(stdout, "     point at infinity\\n");\n        else {\n            if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n                ABORT;\n            fprintf(stdout, "     x = 0x");\n            BN_print_fp(stdout, x);\n            fprintf(stdout, ", y = 0x");\n            BN_print_fp(stdout, y);\n            fprintf(stdout, "\\n");\n        }\n        if (!EC_POINT_copy(R, P))\n            ABORT;\n        if (!EC_POINT_add(group, P, P, Q, ctx))\n            ABORT;\n# if 0\n        {\n            EC_POINT *points[3];\n            points[0] = R;\n            points[1] = Q;\n            points[2] = P;\n            if (!EC_POINTs_make_affine(group, 2, points, ctx))\n                ABORT;\n        }\n# endif\n    }\n    while (!EC_POINT_is_at_infinity(group, P));\n    if (!EC_POINT_add(group, P, Q, R, ctx))\n        ABORT;\n    if (!EC_POINT_is_at_infinity(group, P))\n        ABORT;\n    len =\n        EC_POINT_point2oct(group, Q, POINT_CONVERSION_COMPRESSED, buf,\n                           sizeof buf, ctx);\n    if (len == 0)\n        ABORT;\n    if (!EC_POINT_oct2point(group, P, buf, len, ctx))\n        ABORT;\n    if (0 != EC_POINT_cmp(group, P, Q, ctx))\n        ABORT;\n    fprintf(stdout, "Generator as octet string, compressed form:\\n     ");\n    for (i = 0; i < len; i++)\n        fprintf(stdout, "%02X", buf[i]);\n    len =\n        EC_POINT_point2oct(group, Q, POINT_CONVERSION_UNCOMPRESSED, buf,\n                           sizeof buf, ctx);\n    if (len == 0)\n        ABORT;\n    if (!EC_POINT_oct2point(group, P, buf, len, ctx))\n        ABORT;\n    if (0 != EC_POINT_cmp(group, P, Q, ctx))\n        ABORT;\n    fprintf(stdout, "\\nGenerator as octet string, uncompressed form:\\n     ");\n    for (i = 0; i < len; i++)\n        fprintf(stdout, "%02X", buf[i]);\n    len =\n        EC_POINT_point2oct(group, Q, POINT_CONVERSION_HYBRID, buf, sizeof buf,\n                           ctx);\n    if (len == 0)\n        ABORT;\n    if (!EC_POINT_oct2point(group, P, buf, len, ctx))\n        ABORT;\n    if (0 != EC_POINT_cmp(group, P, Q, ctx))\n        ABORT;\n    fprintf(stdout, "\\nGenerator as octet string, hybrid form:\\n     ");\n    for (i = 0; i < len; i++)\n        fprintf(stdout, "%02X", buf[i]);\n    if (!EC_POINT_get_Jprojective_coordinates_GFp(group, R, x, y, z, ctx))\n        ABORT;\n    fprintf(stdout,\n            "\\nA representation of the inverse of that generator in\\nJacobian projective coordinates:\\n     X = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, ", Y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, ", Z = 0x");\n    BN_print_fp(stdout, z);\n    fprintf(stdout, "\\n");\n    if (!EC_POINT_invert(group, P, ctx))\n        ABORT;\n    if (0 != EC_POINT_cmp(group, P, R, ctx))\n        ABORT;\n    if (!BN_hex2bn(&p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFF"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn(&a, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFC"))\n        ABORT;\n    if (!BN_hex2bn(&b, "1C97BEFC54BD7A8B65ACF89F81D4D4ADC565FA45"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn(&x, "4A96B5688EF573284664698968C38BB913CBFC82"))\n        ABORT;\n    if (!BN_hex2bn(&y, "23a628553168947d59dcc912042351377ac5fb32"))\n        ABORT;\n    if (!EC_POINT_set_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn(&z, "0100000000000000000001F4C8F927AED3CA752257"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nSEC2 curve secp160r1 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn(&z, "23a628553168947d59dcc912042351377ac5fb32"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 160)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_160 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_160, group))\n        ABORT;\n    if (!BN_hex2bn(&p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn(&a, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC"))\n        ABORT;\n    if (!BN_hex2bn(&b, "64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn(&x, "188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, P, x, 1, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn(&z, "FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nNIST curve P-192 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn(&z, "07192B95FFC8DA78631011ED6B24CDD573F977A11E794811"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 192)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_192 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_192, group))\n        ABORT;\n    if (!BN_hex2bn\n        (&p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn\n        (&a, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE"))\n        ABORT;\n    if (!BN_hex2bn\n        (&b, "B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn\n        (&x, "B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, P, x, 0, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn\n        (&z, "FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nNIST curve P-224 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn\n        (&z, "BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 224)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_224 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_224, group))\n        ABORT;\n    if (!BN_hex2bn\n        (&p,\n         "FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn\n        (&a,\n         "FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC"))\n        ABORT;\n    if (!BN_hex2bn\n        (&b,\n         "5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn\n        (&x,\n         "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, P, x, 1, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn(&z, "FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E"\n                   "84F3B9CAC2FC632551"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nNIST curve P-256 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn\n        (&z,\n         "4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 256)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_256 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_256, group))\n        ABORT;\n    if (!BN_hex2bn(&p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn(&a, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFC"))\n        ABORT;\n    if (!BN_hex2bn(&b, "B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE8141"\n                   "120314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn(&x, "AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B"\n                   "9859F741E082542A385502F25DBF55296C3A545E3872760AB7"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, P, x, 1, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn(&z, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFC7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nNIST curve P-384 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn(&z, "3617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A14"\n                   "7CE9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 384)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_384 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_384, group))\n        ABORT;\n    if (!BN_hex2bn(&p, "1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFFFFFFFFFFFF"))\n        ABORT;\n    if (1 != BN_is_prime_ex(p, BN_prime_checks, ctx, NULL))\n        ABORT;\n    if (!BN_hex2bn(&a, "1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFFFFFFFFFFFC"))\n        ABORT;\n    if (!BN_hex2bn(&b, "051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B"\n                   "315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573"\n                   "DF883D2C34F1EF451FD46B503F00"))\n        ABORT;\n    if (!EC_GROUP_set_curve_GFp(group, p, a, b, ctx))\n        ABORT;\n    if (!BN_hex2bn(&x, "C6858E06B70404E9CD9E3ECB662395B4429C648139053F"\n                   "B521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B"\n                   "3C1856A429BF97E7E31C2E5BD66"))\n        ABORT;\n    if (!EC_POINT_set_compressed_coordinates_GFp(group, P, x, 0, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!BN_hex2bn(&z, "1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"\n                   "FFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5"\n                   "C9B8899C47AEBB6FB71E91386409"))\n        ABORT;\n    if (!EC_GROUP_set_generator(group, P, z, BN_value_one()))\n        ABORT;\n    if (!EC_POINT_get_affine_coordinates_GFp(group, P, x, y, ctx))\n        ABORT;\n    fprintf(stdout, "\\nNIST curve P-521 -- Generator:\\n     x = 0x");\n    BN_print_fp(stdout, x);\n    fprintf(stdout, "\\n     y = 0x");\n    BN_print_fp(stdout, y);\n    fprintf(stdout, "\\n");\n    if (!BN_hex2bn(&z, "11839296A789A3BC0045C8A5FB42C7D1BD998F54449579"\n                   "B446817AFBD17273E662C97EE72995EF42640C550B9013FAD0761353C"\n                   "7086A272C24088BE94769FD16650"))\n        ABORT;\n    if (0 != BN_cmp(y, z))\n        ABORT;\n    fprintf(stdout, "verify degree ...");\n    if (EC_GROUP_get_degree(group) != 521)\n        ABORT;\n    fprintf(stdout, " ok\\n");\n    group_order_tests(group);\n    if (!(P_521 = EC_GROUP_new(EC_GROUP_method_of(group))))\n        ABORT;\n    if (!EC_GROUP_copy(P_521, group))\n        ABORT;\n    if (!EC_POINT_copy(Q, P))\n        ABORT;\n    if (EC_POINT_is_at_infinity(group, Q))\n        ABORT;\n    if (!EC_POINT_dbl(group, P, P, ctx))\n        ABORT;\n    if (!EC_POINT_is_on_curve(group, P, ctx))\n        ABORT;\n    if (!EC_POINT_invert(group, Q, ctx))\n        ABORT;\n    if (!EC_POINT_add(group, R, P, Q, ctx))\n        ABORT;\n    if (!EC_POINT_add(group, R, R, Q, ctx))\n        ABORT;\n    if (!EC_POINT_is_at_infinity(group, R))\n        ABORT;\n    {\n        const EC_POINT *points[4];\n        const BIGNUM *scalars[4];\n        BIGNUM *scalar3;\n        if (EC_POINT_is_at_infinity(group, Q))\n            ABORT;\n        points[0] = Q;\n        points[1] = Q;\n        points[2] = Q;\n        points[3] = Q;\n        if (!EC_GROUP_get_order(group, z, ctx))\n            ABORT;\n        if (!BN_add(y, z, BN_value_one()))\n            ABORT;\n        if (BN_is_odd(y))\n            ABORT;\n        if (!BN_rshift1(y, y))\n            ABORT;\n        scalars[0] = y;\n        scalars[1] = y;\n        fprintf(stdout, "combined multiplication ...");\n        fflush(stdout);\n        if (!EC_POINTs_mul(group, P, NULL, 2, points, scalars, ctx))\n            ABORT;\n        if (!EC_POINTs_mul(group, R, z, 2, points, scalars, ctx))\n            ABORT;\n        if (0 != EC_POINT_cmp(group, P, R, ctx))\n            ABORT;\n        if (0 != EC_POINT_cmp(group, R, Q, ctx))\n            ABORT;\n        fprintf(stdout, ".");\n        fflush(stdout);\n        if (!BN_pseudo_rand(y, BN_num_bits(y), 0, 0))\n            ABORT;\n        if (!BN_add(z, z, y))\n            ABORT;\n        BN_set_negative(z, 1);\n        scalars[0] = y;\n        scalars[1] = z;\n        if (!EC_POINTs_mul(group, P, NULL, 2, points, scalars, ctx))\n            ABORT;\n        if (!EC_POINT_is_at_infinity(group, P))\n            ABORT;\n        fprintf(stdout, ".");\n        fflush(stdout);\n        if (!BN_pseudo_rand(x, BN_num_bits(y) - 1, 0, 0))\n            ABORT;\n        if (!BN_add(z, x, y))\n            ABORT;\n        BN_set_negative(z, 1);\n        scalars[0] = x;\n        scalars[1] = y;\n        scalars[2] = z;\n        scalar3 = BN_new();\n        if (!scalar3)\n            ABORT;\n        BN_zero(scalar3);\n        scalars[3] = scalar3;\n        if (!EC_POINTs_mul(group, P, NULL, 4, points, scalars, ctx))\n            ABORT;\n        if (!EC_POINT_is_at_infinity(group, P))\n            ABORT;\n        fprintf(stdout, " ok\\n\\n");\n        BN_free(scalar3);\n    }\n# if 0\n    timings(P_160, TIMING_BASE_PT, ctx);\n    timings(P_160, TIMING_RAND_PT, ctx);\n    timings(P_160, TIMING_SIMUL, ctx);\n    timings(P_192, TIMING_BASE_PT, ctx);\n    timings(P_192, TIMING_RAND_PT, ctx);\n    timings(P_192, TIMING_SIMUL, ctx);\n    timings(P_224, TIMING_BASE_PT, ctx);\n    timings(P_224, TIMING_RAND_PT, ctx);\n    timings(P_224, TIMING_SIMUL, ctx);\n    timings(P_256, TIMING_BASE_PT, ctx);\n    timings(P_256, TIMING_RAND_PT, ctx);\n    timings(P_256, TIMING_SIMUL, ctx);\n    timings(P_384, TIMING_BASE_PT, ctx);\n    timings(P_384, TIMING_RAND_PT, ctx);\n    timings(P_384, TIMING_SIMUL, ctx);\n    timings(P_521, TIMING_BASE_PT, ctx);\n    timings(P_521, TIMING_RAND_PT, ctx);\n    timings(P_521, TIMING_SIMUL, ctx);\n# endif\n    if (ctx)\n        BN_CTX_free(ctx);\n    BN_free(p);\n    BN_free(a);\n    BN_free(b);\n    EC_GROUP_free(group);\n    EC_POINT_free(P);\n    EC_POINT_free(Q);\n    EC_POINT_free(R);\n    BN_free(x);\n    BN_free(y);\n    BN_free(z);\n    if (P_160)\n        EC_GROUP_free(P_160);\n    if (P_192)\n        EC_GROUP_free(P_192);\n    if (P_224)\n        EC_GROUP_free(P_224);\n    if (P_256)\n        EC_GROUP_free(P_256);\n    if (P_384)\n        EC_GROUP_free(P_384);\n    if (P_521)\n        EC_GROUP_free(P_521);\n}', "int BN_hex2bn(BIGNUM **bn, const char *a)\n{\n    BIGNUM *ret = NULL;\n    BN_ULONG l = 0;\n    int neg = 0, h, m, i, j, k, c;\n    int num;\n    if ((a == NULL) || (*a == '\\0'))\n        return (0);\n    if (*a == '-') {\n        neg = 1;\n        a++;\n    }\n    for (i = 0; isxdigit((unsigned char)a[i]); i++) ;\n    num = i + neg;\n    if (bn == NULL)\n        return (num);\n    if (*bn == NULL) {\n        if ((ret = BN_new()) == NULL)\n            return (0);\n    } else {\n        ret = *bn;\n        BN_zero(ret);\n    }\n    if (bn_expand(ret, i * 4) == NULL)\n        goto err;\n    j = i;\n    m = 0;\n    h = 0;\n    while (j > 0) {\n        m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;\n        l = 0;\n        for (;;) {\n            c = a[j - m];\n            if ((c >= '0') && (c <= '9'))\n                k = c - '0';\n            else if ((c >= 'a') && (c <= 'f'))\n                k = c - 'a' + 10;\n            else if ((c >= 'A') && (c <= 'F'))\n                k = c - 'A' + 10;\n            else\n                k = 0;\n            l = (l << 4) | k;\n            if (--m <= 0) {\n                ret->d[h++] = l;\n                break;\n            }\n        }\n        j -= (BN_BYTES * 2);\n    }\n    ret->top = h;\n    bn_correct_top(ret);\n    ret->neg = neg;\n    *bn = ret;\n    bn_check_top(ret);\n    return (num);\n err:\n    if (*bn == NULL)\n        BN_free(ret);\n    return (0);\n}"]