ecparam.c

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		for (n = 0; n < crv_len; n++)
			{
			const char *comment;
			const char *sname;
			comment = curves[n].comment;
			sname   = OBJ_nid2sn(curves[n].nid);
			if (comment == NULL)
				comment = "CURVE DESCRIPTION NOT AVAILABLE";
			if (sname == NULL)
				sname = "";

			BIO_printf(out, "  %-10s: ", sname);
			BIO_printf(out, "%s\n", comment);
			} 

		OPENSSL_free(curves);
		ret = 0;
		goto end;
		}

	if (curve_name != NULL)
		{
		int nid;

		/* workaround for the SECG curve names secp192r1
		 * and secp256r1 (which are the same as the curves
		 * prime192v1 and prime256v1 defined in X9.62)
		 */
		if (!strcmp(curve_name, "secp192r1"))
			{
			BIO_printf(bio_err, "using curve name prime192v1 "
				"instead of secp192r1\n");
			nid = NID_X9_62_prime192v1;
			}
		else if (!strcmp(curve_name, "secp256r1"))
			{
			BIO_printf(bio_err, "using curve name prime256v1 "
				"instead of secp256r1\n");
			nid = NID_X9_62_prime256v1;
			}
		else
			nid = OBJ_sn2nid(curve_name);
	
		if (nid == 0)
			{
			BIO_printf(bio_err, "unknown curve name (%s)\n", 
				curve_name);
			goto end;
			}

		group = EC_GROUP_new_by_curve_name(nid);
		if (group == NULL)
			{
			BIO_printf(bio_err, "unable to create curve (%s)\n", 
				curve_name);
			goto end;
			}
		EC_GROUP_set_asn1_flag(group, asn1_flag);
		EC_GROUP_set_point_conversion_form(group, form);
		}
	else if (informat == FORMAT_ASN1)
		{
		group = d2i_ECPKParameters_bio(in, NULL);
		}
	else if (informat == FORMAT_PEM)
		{
		group = PEM_read_bio_ECPKParameters(in,NULL,NULL,NULL);
		}
	else
		{
		BIO_printf(bio_err, "bad input format specified\n");
		goto end;
		}

	if (group == NULL)
		{
		BIO_printf(bio_err, 
			"unable to load elliptic curve parameters\n");
		ERR_print_errors(bio_err);
		goto end;
		}

	if (new_form)
		EC_GROUP_set_point_conversion_form(group, form);

	if (new_asn1_flag)
		EC_GROUP_set_asn1_flag(group, asn1_flag);

	if (no_seed)
		{
		EC_GROUP_set_seed(group, NULL, 0);
		}

	if (text)
		{
		if (!ECPKParameters_print(out, group, 0))
			goto end;
		}

	if (check)
		{
		if (group == NULL)
			BIO_printf(bio_err, "no elliptic curve parameters\n");
		BIO_printf(bio_err, "checking elliptic curve parameters: ");
		if (!EC_GROUP_check(group, NULL))
			{
			BIO_printf(bio_err, "failed\n");
			ERR_print_errors(bio_err);
			}
		else
			BIO_printf(bio_err, "ok\n");
			
		}

	if (C)
		{
		size_t	buf_len = 0, tmp_len = 0;
		const EC_POINT *point;
		int	is_prime, len = 0;
		const EC_METHOD *meth = EC_GROUP_method_of(group);

		if ((ec_p = BN_new()) == NULL || (ec_a = BN_new()) == NULL ||
		    (ec_b = BN_new()) == NULL || (ec_gen = BN_new()) == NULL ||
		    (ec_order = BN_new()) == NULL || 
		    (ec_cofactor = BN_new()) == NULL )
			{
			perror("OPENSSL_malloc");
			goto end;
			}

		is_prime = (EC_METHOD_get_field_type(meth) == 
			NID_X9_62_prime_field);

		if (is_prime)
			{
			if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a,
				ec_b, NULL))
				goto end;
			}
		else
			{
			/* TODO */
			goto end;
			}

		if ((point = EC_GROUP_get0_generator(group)) == NULL)
			goto end;
		if (!EC_POINT_point2bn(group, point, 
			EC_GROUP_get_point_conversion_form(group), ec_gen, 
			NULL))
			goto end;
		if (!EC_GROUP_get_order(group, ec_order, NULL))
			goto end;
		if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
			goto end;

		if (!ec_p || !ec_a || !ec_b || !ec_gen || 
			!ec_order || !ec_cofactor)
			goto end;

		len = BN_num_bits(ec_order);

		if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
			buf_len = tmp_len;
		if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
			buf_len = tmp_len;
		if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
			buf_len = tmp_len;
		if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
			buf_len = tmp_len;
		if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
			buf_len = tmp_len;
		if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
			buf_len = tmp_len;

		buffer = (unsigned char *)OPENSSL_malloc(buf_len);

		if (buffer == NULL)
			{
			perror("OPENSSL_malloc");
			goto end;
			}

		ecparam_print_var(out, ec_p, "ec_p", len, buffer);
		ecparam_print_var(out, ec_a, "ec_a", len, buffer);
		ecparam_print_var(out, ec_b, "ec_b", len, buffer);
		ecparam_print_var(out, ec_gen, "ec_gen", len, buffer);
		ecparam_print_var(out, ec_order, "ec_order", len, buffer);
		ecparam_print_var(out, ec_cofactor, "ec_cofactor", len, 
			buffer);

		BIO_printf(out, "\n\n");

		BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n\t{\n", len);
		BIO_printf(out, "\tint ok=0;\n");
		BIO_printf(out, "\tEC_GROUP *group = NULL;\n");
		BIO_printf(out, "\tEC_POINT *point = NULL;\n");
		BIO_printf(out, "\tBIGNUM   *tmp_1 = NULL, *tmp_2 = NULL, "
				"*tmp_3 = NULL;\n\n");
		BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_p_%d, "
				"sizeof(ec_p_%d), NULL)) == NULL)\n\t\t"
				"goto err;\n", len, len);
		BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_a_%d, "
				"sizeof(ec_a_%d), NULL)) == NULL)\n\t\t"
				"goto err;\n", len, len);
		BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_b_%d, "
				"sizeof(ec_b_%d), NULL)) == NULL)\n\t\t"
				"goto err;\n", len, len);
		if (is_prime)
			{
			BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_"
				"GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)"
				"\n\t\tgoto err;\n\n");
			}
		else
			{
			/* TODO */
			goto end;
			}
		BIO_printf(out, "\t/* build generator */\n");
		BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_gen_%d, "
				"sizeof(ec_gen_%d), tmp_1)) == NULL)"
				"\n\t\tgoto err;\n", len, len);
		BIO_printf(out, "\tpoint = EC_POINT_bn2point(group, tmp_1, "
				"NULL, NULL);\n");
		BIO_printf(out, "\tif (point == NULL)\n\t\tgoto err;\n");
		BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_order_%d, "
				"sizeof(ec_order_%d), tmp_2)) == NULL)"
				"\n\t\tgoto err;\n", len, len);
		BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_cofactor_%d, "
				"sizeof(ec_cofactor_%d), tmp_3)) == NULL)"
				"\n\t\tgoto err;\n", len, len);
		BIO_printf(out, "\tif (!EC_GROUP_set_generator(group, point,"
				" tmp_2, tmp_3))\n\t\tgoto err;\n");
		BIO_printf(out, "\n\tok=1;\n");
		BIO_printf(out, "err:\n");
		BIO_printf(out, "\tif (tmp_1)\n\t\tBN_free(tmp_1);\n");
		BIO_printf(out, "\tif (tmp_2)\n\t\tBN_free(tmp_2);\n");
		BIO_printf(out, "\tif (tmp_3)\n\t\tBN_free(tmp_3);\n");
		BIO_printf(out, "\tif (point)\n\t\tEC_POINT_free(point);\n");
		BIO_printf(out, "\tif (!ok)\n");
		BIO_printf(out, "\t\t{\n");
		BIO_printf(out, "\t\tEC_GROUP_free(group);\n");
		BIO_printf(out, "\t\tgroup = NULL;\n");
		BIO_printf(out, "\t\t}\n");
		BIO_printf(out, "\treturn(group);\n\t}\n");
	}

	if (!noout)
		{
		if (outformat == FORMAT_ASN1)
			i = i2d_ECPKParameters_bio(out, group);
		else if (outformat == FORMAT_PEM)
			i = PEM_write_bio_ECPKParameters(out, group);
		else	
			{
			BIO_printf(bio_err,"bad output format specified for"
				" outfile\n");
			goto end;
			}
		if (!i)
			{
			BIO_printf(bio_err, "unable to write elliptic "
				"curve parameters\n");
			ERR_print_errors(bio_err);
			goto end;
			}
		}
	
	if (need_rand)
		{
		app_RAND_load_file(NULL, bio_err, (inrand != NULL));
		if (inrand != NULL)
			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
				app_RAND_load_files(inrand));
		}

	if (genkey)
		{
		EC_KEY *eckey = EC_KEY_new();

		if (eckey == NULL)
			goto end;

		assert(need_rand);

		if (EC_KEY_set_group(eckey, group) == 0)
			goto end;
		
		if (!EC_KEY_generate_key(eckey))
			{
			EC_KEY_free(eckey);
			goto end;
			}
		if (outformat == FORMAT_ASN1)
			i = i2d_ECPrivateKey_bio(out, eckey);
		else if (outformat == FORMAT_PEM)
			i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
				NULL, 0, NULL, NULL);
		else	
			{
			BIO_printf(bio_err, "bad output format specified "
				"for outfile\n");
			EC_KEY_free(eckey);
			goto end;
			}
		EC_KEY_free(eckey);
		}

	if (need_rand)
		app_RAND_write_file(NULL, bio_err);

	ret=0;
end:
	if (ec_p)
		BN_free(ec_p);
	if (ec_a)
		BN_free(ec_a);
	if (ec_b)
		BN_free(ec_b);
	if (ec_gen)
		BN_free(ec_gen);
	if (ec_order)
		BN_free(ec_order);
	if (ec_cofactor)
		BN_free(ec_cofactor);
	if (buffer)
		OPENSSL_free(buffer);
	if (in != NULL)
		BIO_free(in);
	if (out != NULL)
		BIO_free_all(out);
	if (group != NULL)
		EC_GROUP_free(group);
	apps_shutdown();
	OPENSSL_EXIT(ret);
}

static int ecparam_print_var(BIO *out, BIGNUM *in, const char *var,
	int len, unsigned char *buffer)
	{
	BIO_printf(out, "static unsigned char %s_%d[] = {", var, len);
	if (BN_is_zero(in))
		BIO_printf(out, "\n\t0x00");
	else 
		{
		int i, l;

		l = BN_bn2bin(in, buffer);
		for (i=0; i<l-1; i++)
			{
			if ((i%12) == 0) 
				BIO_printf(out, "\n\t");
			BIO_printf(out, "0x%02X,", buffer[i]);
			}
		if ((i%12) == 0) 
			BIO_printf(out, "\n\t");
		BIO_printf(out, "0x%02X", buffer[i]);
		}
	BIO_printf(out, "\n\t};\n\n");
	return 1;
	}
#endif