在 ReactNative 中使用 JavaScript BigInteger 类型

Question

我有一个旧的 JavaScript 库，它在 web 客户端和 ReactJS 框架中运行良好。在这个库中有一个用于生成 BigInteger 类型的 JavaScript 文件，为此使用 JavaApplet BigInteger 类型。但是我想在我的 ReactNative 项目中使用这个库。我不能在 ReactNative 中使用 JavaApplets（我不确定！），我用现有的 JavaScript BigInteger 实现替换了它，但它们没有我需要的功能，如BigInteger.bitLength().

我的问题是：有没有办法在 ReactNative 中使用 Java BigInteger 类？！

下面是我的 JavaScript 文件：

/** BigInt.js */

var BigInteger = require("big-integer");

var USE_SJCL = true;

// let's make this much cleaner
if (USE_SJCL) {
    var BigInt = BigInteger;
    BigInt.TWO = new BigInt("2",10);

    BigInt.setup = function(callback, fail_callback) {
    callback();
    }

    BigInt.prototype.toJSONObject = function() {
    return this.toString();
    };

} else {
    BigInt = Class.extend({
        init: function(value, radix) {
        if (value == null) {
            throw "null value!";
        }

        if (USE_SJCL) {
            this._java_bigint = new BigInteger(value, radix);
        } else if (BigInt.use_applet) {
            this._java_bigint = BigInt.APPLET.newBigInteger(value, radix);
        } else {
            try {
            this._java_bigint = new java.math.BigInteger(value, radix);
            } catch (e) {
            // alert("oy " + e.toString() + " value=" + value + " , radix=" + radix);
            throw TypeError
            }
        }
        },

        toString: function() {
        return this._java_bigint.toString() + "";
        },

        toJSONObject: function() {
        return this.toString();
        },

        add: function(other) {
        return BigInt._from_java_object(this._java_bigint.add(other._java_bigint));
        },

        bitLength: function() {
        return this._java_bigint.bitLength();
        },

        mod: function(modulus) {
        return BigInt._from_java_object(this._java_bigint.mod(modulus._java_bigint));
        },

        equals: function(other) {
        return this._java_bigint.equals(other._java_bigint);
        },

        modPow: function(exp, modulus) {
        return BigInt._from_java_object(this._java_bigint.modPow(exp._java_bigint, modulus._java_bigint));
        },

        negate: function() {
        return BigInt._from_java_object(this._java_bigint.negate());
        },

        multiply: function(other) {
        return BigInt._from_java_object(this._java_bigint.multiply(other._java_bigint));
        },

        modInverse: function(modulus) {
        return BigInt._from_java_object(this._java_bigint.modInverse(modulus._java_bigint));
        }

    });

    BigInt.ready_p = false;

    BigInt._from_java_object = function(jo) {
    var obj = new BigInt("0",10);
    obj._java_bigint = jo;
    return obj;
    };

    function check_applet() {
    var is_ns4 = (navigator.appName == "Netscape" && navigator.appVersion < "5");

    var str_workaround = (navigator.appName == "Opera");

    BigInt.is_ie = (navigator.appName == "Microsoft Internet Explorer");

    var use_applet = BigInt.is_ie || (!is_ns4 && navigator.platform.substr(0, 5) == "Linux") || str_workaround || typeof(java) == 'undefined';

    // add the applet
    if (use_applet) {
        var applet_base = JSCRYPTO_HOME;

        var applet_html = '<applet codebase="' + applet_base + '" mayscript name="bigint" code="bigint.class" width=1 height=1 id="bigint_applet"></applet>';
        // var applet_html = '<object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" name="bigint" width="1" height="1" codebase="http://java.sun.com/products/plugin/autodl/jinstall-1_5_0-windows-i586.cab#Version=1,5,0,0"> <param name="code" value="bigint.class"> <param name="codebase" value="' + applet_base + '"> <param name="archive" value="myapplet.jar"> <param name="type" value="application/x-java-applet;version=1.5.0"> <param name="scriptable" value="true"> <param name="mayscript" value="false"> <comment> <embed code="bigint.class" name="bigint" java_codebase="' + applet_base + '" width="1" height="1" scriptable="true" mayscript="false" type="application/x-java-applet;version=1.5.0" pluginspage="http://java.sun.com/j2se/1.5.0/download.html"> <noembed>No Java Support.</noembed> </embed> </comment> </object>';
        $("#applet_div").html(applet_html);
    }

    return use_applet;
    };

    BigInt._setup = function() {
    if (BigInt.use_applet) {
        BigInt.APPLET = document.applets["bigint"];
    }

    try {
        BigInt.ZERO = new BigInt("0",10);
        BigInt.ONE = new BigInt("1",10);
        BigInt.TWO = new BigInt("2",10);
        BigInt.FORTY_TWO = new BigInt("42",10);

        BigInt.ready_p = true;
    } catch (e) {
        if (this.num_invocations == null)
        this.num_invocations = 0;

        this.num_invocations += 1;

        if (this.num_invocations > 5) {
        if (!USE_SJCL) {
            USE_SJCL = true;
            this.num_invocations = 1;
            BigInt.use_applet = false;
        } else {

            if (BigInt.setup_interval)
            window.clearInterval(BigInt.setup_interval);

            if (BigInt.setup_fail) {
            BigInt.setup_fail();
            } else {
            alert('bigint failed!');
            }
        }
        }
        return;
    }

    if (BigInt.setup_interval)
        window.clearInterval(BigInt.setup_interval);

    if (BigInt.setup_callback)
        BigInt.setup_callback();
    };

    BigInt.setup = function(callback, fail_callback) {
    if (callback)
        BigInt.setup_callback = callback;

    if (fail_callback)
        BigInt.setup_fail = fail_callback;

    BigInt.setup_interval = window.setInterval("BigInt._setup()", 1000);
    }
}

BigInt.fromJSONObject = function(s) {
    return new BigInt(s, 10);
};

BigInt.fromInt = function(i) {
    return BigInt.fromJSONObject("" + i);
};

BigInt.use_applet = false;

和 Java Applet 代码：

public class bigint extends java.applet.Applet {
    public java.security.SecureRandom newSecureRandom() {
        return new java.security.SecureRandom();
    }

    public java.math.BigInteger newBigInteger(String value, int radix) {
        return new java.math.BigInteger(value, radix);
    }

    public java.math.BigInteger randomBigInteger(int bitlen, java.util.Random rng) {
        return new java.math.BigInteger(bitlen, rng);
    }

    public java.math.BigInteger randomPrimeBigInteger(int bitlen, int certainty, java.util.Random rng) {
        return new java.math.BigInteger(bitlen, certainty, rng);
    }
}