LoadRunner 12 模擬 RSA加密 登錄的實現（JS）

LR 12 中 web_js_run API 非常坑，只能調用一個 JS 文件；更坑的是，不能通用 一個JS調用另外一個JS；（可能有，但在網上找了N個國家，都沒有找到！如有，還請朋友告之，謝謝。）

現大部分的前端登錄都有使用到RSA加密，以保障用戶在登錄的時候，賬號密碼不直接以明文方式傳輸，經過加密的賬號密碼即使被截取，也難以破解出真實的賬號密碼；
RSA 相關信息請自行搜索了解或下載， RSA加密算法在網上有N多開源的現成庫可用（前、后端庫）；

經RSA加密的登錄流程大致為：

1、前端在登錄時會向服務端請求 RSA 四個關鍵值： PublicKey ， Exponent ，rKey ， Modulus；
2、前端使用獲取到的 Exponent , Modulus （ 通過 RSA 庫在前端執行）計算出私鑰，然后使用獲得的公鑰以及私鑰 對 用戶的賬號密碼 進行加密，並生成加密后的字符串；
3、最后前端將完成加密的字符串發送給服務端，服務端解密成功后，返回登錄成功的狀態；
以下將以RSA加密登錄為例，演示在Loadrunner 中的如何實現；

Action()
{
    //char cliEncrypt[1000]; //用於保存需要加密的拼接好的字符串
    int rc=0;
    lr_save_string("19000000026","mobileNumberSet");//參數化的正確姿勢 lr_save_string(lr_eval_string("{user_mobile}"),"mobileNumberSet");   6     lr_save_string("123456","pwdSet");
    lr_save_string("","imgVerifyCodeSet");

    web_reg_save_param("SerJsonData", "LB=", "RB=", "Search=Body", LAST);
    
    web_submit_data("encryptKey.action",
        "Action=http://192.168.1.16/surperman/login/encryptKey.action", 
        "Method=GET", 
        "RecContentType=text/html", 
        "Referer=", 
        "Snapshot=t19.inf", 
        "Mode=HTML", 
        ITEMDATA, 
        LAST);
    
    lr_output_message("# 獲取密鑰響應內容體：\n%s", lr_eval_string("{SerJsonData}"));
        
    web_js_run(
        "Code=getPublicKey(LR.getParam('SerJsonData'));",
        "ResultParam=getDataPublicKey",
        SOURCES,
        "File=getkey.js",ENDITEM,
        LAST);
    
    web_js_run(
        "Code=getExponent(LR.getParam('SerJsonData'));",
        "ResultParam=getDataExponent",
        SOURCES,
        "File=getkey.js",ENDITEM,
        LAST);
    
    web_js_run(
        "Code=getrKey(LR.getParam('SerJsonData'));",
        "ResultParam=getDatarKey",
        SOURCES,
        "File=getkey.js",ENDITEM,
        LAST);
    
    web_js_run(
        "Code=getModulus(LR.getParam('SerJsonData'));",
        "ResultParam=getDataModulus",
        SOURCES,
        "File=getkey.js",ENDITEM,
        LAST);
    
    lr_output_message("# getDataPublicKey 的值為：\n%s", lr_eval_string("{getDataPublicKey}"));
    lr_output_message("# getDataExponent 的值為：\n%s", lr_eval_string("{getDataExponent}"));
    lr_output_message("# getDatarKey 的值為：\n%s", lr_eval_string("{getDatarKey}"));
    lr_output_message("# getDataModulus 的值為：\n%s", lr_eval_string("{getDataModulus}"));
    
/*
    lr_output_message("# mobileNumberSet 的值為：\n%s", lr_eval_string("{mobileNumberSet}"));
    lr_output_message("# pwdSet 的值為：\n%s", lr_eval_string("{pwdSet}"));
    lr_output_message("# imgVerifyCodeSet 的值為：\n%s", lr_eval_string("{imgVerifyCodeSet}"));
*/
    //拼接 輸入的手機號、密碼等 需要加密字符串
    //sprintf(cliEncrypt,"mobileNumber=%s&pwd=%s&imgVerifyCode=%s",lr_eval_string("{mobileNumberSet}"),lr_eval_string("{pwdSet}"),lr_eval_string("{imgVerifyCodeSet}"));

    //將拼接好的字符串賦值給參數 parCliEncrypt
    //lr_save_string(cliEncrypt,"parCliEncrypt");
    //lr_output_message(lr_eval_string("{parCliEncrypt}"));

       web_js_run(
        "Code=createEncrypt();",
        "ResultParam=NewkeyEncrypt",
        SOURCES,
        "File=loginEncryptStr.js",
        ENDITEM,
        LAST);
 
    lr_output_message("# NewkeyEncrypt 的值為：\n%s", lr_eval_string("{NewkeyEncrypt}"));
 
    /*輸入賬號密碼后，點擊登錄*/

    web_reg_save_param("newTokenJson", "LB=", "RB=", "Search=Body", LAST);
    
    rc=web_custom_request("userPwdLogin.action", 
        "URL=http://192.168.1.16/surperman/login/userPwdLogin.action", 
        "Method=POST", 
        "Resource=0", 
        "RecContentType=text/html", 
        "Referer=", 
        "Snapshot=t21.inf", 
        "Mode=HTML", 
        "Body=encrypt={NewkeyEncrypt}&rKey={getDatarKey}",
        LAST);

    // 返回的字符串需要做編碼轉換處理，否則中文會顯示為亂碼
    lr_convert_string_encoding(lr_eval_string("{newTokenJson}"),"utf-8",NULL,"newTokenJsonUTF");
    
    lr_output_message("# newTokenJson 的值為：\n%s", lr_eval_string("{newTokenJson}"));
    lr_output_message("# newTokenJsonUTF 的值為：\n%s\nJS執行結果：%d", lr_eval_string("{newTokenJsonUTF}"), rc);

    return 0;
}

LR 中 web_js_run 所調用的 getkey.js 長這樣：

function getPublicKey(stringData)
{ 
    var data = JSON.parse(stringData);
    return data.publicKey;
} 

function getExponent(stringData)
{ 
    var data = JSON.parse(stringData);
    return data.exponent;
} 

function getrKey(stringData)
{ 
    var data = JSON.parse(stringData);
    return data.rKey;
} 

function getModulus(stringData)
{ 
    var data = JSON.parse(stringData);
    return data.modulus;
} 

LR 中 web_js_run 所調用的 loginEncryptStr.js 長這樣（RSA 庫前端開源部分代碼可以直接跳過）：

// RSA 庫前端開源部分 - 開始
var RSAUtils = {};

var biRadixBase = 2;
var biRadixBits = 16;
var bitsPerDigit = biRadixBits;
var biRadix = 1 << 16; // = 2^16 = 65536
var biHalfRadix = biRadix >>> 1;
var biRadixSquared = biRadix * biRadix;
var maxDigitVal = biRadix - 1;
var maxInteger = 9999999999999998;

//maxDigits:
//Change this to accommodate your largest number size. Use setMaxDigits()
//to change it!
//
//In general, if you're working with numbers of size N bits, you'll need 2*N
//bits of storage. Each digit holds 16 bits. So, a 1024-bit key will need
//
//1024 * 2 / 16 = 128 digits of storage.
//
var maxDigits;
var ZERO_ARRAY;
var bigZero,
bigOne;

var BigInt = window.BigInt = function (flag) {
    if (typeof flag == "boolean" && flag == true) {
        this.digits = null;
    } else {
        this.digits = ZERO_ARRAY.slice(0);
    }
    this.isNeg = false;
};

RSAUtils.setMaxDigits = function (value) {
    maxDigits = value;
    ZERO_ARRAY = new Array(maxDigits);
    for (var iza = 0; iza < ZERO_ARRAY.length; iza++)
        ZERO_ARRAY[iza] = 0;
    bigZero = new BigInt();
    bigOne = new BigInt();
    bigOne.digits[0] = 1;
};
RSAUtils.setMaxDigits(20);

//The maximum number of digits in base 10 you can convert to an
//integer without JavaScript throwing up on you.
var dpl10 = 15;

RSAUtils.biFromNumber = function (i) {
    var result = new BigInt();
    result.isNeg = i < 0;
    i = Math.abs(i);
    var j = 0;
    while (i > 0) {
        result.digits[j++] = i & maxDigitVal;
        i = Math.floor(i / biRadix);
    }
    return result;
};

//lr10 = 10 ^ dpl10
var lr10 = RSAUtils.biFromNumber(1000000000000000);

RSAUtils.biFromDecimal = function (s) {
    var isNeg = s.charAt(0) == '-';
    var i = isNeg ? 1 : 0;
    var result;
    // Skip leading zeros.
    while (i < s.length && s.charAt(i) == '0')
        ++i;
    if (i == s.length) {
        result = new BigInt();
    } else {
        var digitCount = s.length - i;
        var fgl = digitCount % dpl10;
        if (fgl == 0)
            fgl = dpl10;
        result = RSAUtils.biFromNumber(Number(s.substr(i, fgl)));
        i += fgl;
        while (i < s.length) {
            result = RSAUtils.biAdd(RSAUtils.biMultiply(result, lr10),
                    RSAUtils.biFromNumber(Number(s.substr(i, dpl10))));
            i += dpl10;
        }
        result.isNeg = isNeg;
    }
    return result;
};

RSAUtils.biCopy = function (bi) {
    var result = new BigInt(true);
    result.digits = bi.digits.slice(0);
    result.isNeg = bi.isNeg;
    return result;
};

RSAUtils.reverseStr = function (s) {
    var result = "";
    for (var i = s.length - 1; i > -1; --i) {
        result += s.charAt(i);
    }
    return result;
};

var hexatrigesimalToChar = [
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
    'u', 'v', 'w', 'x', 'y', 'z'
];

RSAUtils.biToString = function (x, radix) { // 2 <= radix <= 36
    var b = new BigInt();
    b.digits[0] = radix;
    var qr = RSAUtils.biDivideModulo(x, b);
    var result = hexatrigesimalToChar[qr[1].digits[0]];
    while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
        qr = RSAUtils.biDivideModulo(qr[0], b);
        digit = qr[1].digits[0];
        result += hexatrigesimalToChar[qr[1].digits[0]];
    }
    return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
};

RSAUtils.biToDecimal = function (x) {
    var b = new BigInt();
    b.digits[0] = 10;
    var qr = RSAUtils.biDivideModulo(x, b);
    var result = String(qr[1].digits[0]);
    while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
        qr = RSAUtils.biDivideModulo(qr[0], b);
        result += String(qr[1].digits[0]);
    }
    return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
};

var hexToChar = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f'];

RSAUtils.digitToHex = function (n) {
    var mask = 0xf;
    var result = "";
    for (i = 0; i < 4; ++i) {
        result += hexToChar[n & mask];
        n >>>= 4;
    }
    return RSAUtils.reverseStr(result);
};

RSAUtils.biToHex = function (x) {
    var result = "";
    var n = RSAUtils.biHighIndex(x);
    for (var i = RSAUtils.biHighIndex(x); i > -1; --i) {
        result += RSAUtils.digitToHex(x.digits[i]);
    }
    return result;
};

RSAUtils.charToHex = function (c) {
    var ZERO = 48;
    var NINE = ZERO + 9;
    var littleA = 97;
    var littleZ = littleA + 25;
    var bigA = 65;
    var bigZ = 65 + 25;
    var result;

    if (c >= ZERO && c <= NINE) {
        result = c - ZERO;
    } else if (c >= bigA && c <= bigZ) {
        result = 10 + c - bigA;
    } else if (c >= littleA && c <= littleZ) {
        result = 10 + c - littleA;
    } else {
        result = 0;
    }
    return result;
};

RSAUtils.hexToDigit = function (s) {
    var result = 0;
    var sl = Math.min(s.length, 4);
    for (var i = 0; i < sl; ++i) {
        result <<= 4;
        result |= RSAUtils.charToHex(s.charCodeAt(i));
    }
    return result;
};

RSAUtils.biFromHex = function (s) {
    var result = new BigInt();
    var sl = s.length;
    for (var i = sl, j = 0; i > 0; i -= 4, ++j) {
        result.digits[j] = RSAUtils.hexToDigit(s.substr(Math.max(i - 4, 0), Math.min(i, 4)));
    }
    return result;
};

RSAUtils.biFromString = function (s, radix) {
    var isNeg = s.charAt(0) == '-';
    var istop = isNeg ? 1 : 0;
    var result = new BigInt();
    var place = new BigInt();
    place.digits[0] = 1; // radix^0
    for (var i = s.length - 1; i >= istop; i--) {
        var c = s.charCodeAt(i);
        var digit = RSAUtils.charToHex(c);
        var biDigit = RSAUtils.biMultiplyDigit(place, digit);
        result = RSAUtils.biAdd(result, biDigit);
        place = RSAUtils.biMultiplyDigit(place, radix);
    }
    result.isNeg = isNeg;
    return result;
};

RSAUtils.biDump = function (b) {
    return (b.isNeg ? "-" : "") + b.digits.join(" ");
};

RSAUtils.biAdd = function (x, y) {
    var result;

    if (x.isNeg != y.isNeg) {
        y.isNeg = !y.isNeg;
        result = RSAUtils.biSubtract(x, y);
        y.isNeg = !y.isNeg;
    } else {
        result = new BigInt();
        var c = 0;
        var n;
        for (var i = 0; i < x.digits.length; ++i) {
            n = x.digits[i] + y.digits[i] + c;
            result.digits[i] = n % biRadix;
            c = Number(n >= biRadix);
        }
        result.isNeg = x.isNeg;
    }
    return result;
};

RSAUtils.biSubtract = function (x, y) {
    var result;
    if (x.isNeg != y.isNeg) {
        y.isNeg = !y.isNeg;
        result = RSAUtils.biAdd(x, y);
        y.isNeg = !y.isNeg;
    } else {
        result = new BigInt();
        var n,
        c;
        c = 0;
        for (var i = 0; i < x.digits.length; ++i) {
            n = x.digits[i] - y.digits[i] + c;
            result.digits[i] = n % biRadix;
            // Stupid non-conforming modulus operation.
            if (result.digits[i] < 0)
                result.digits[i] += biRadix;
            c = 0 - Number(n < 0);
        }
        // Fix up the negative sign, if any.
        if (c == -1) {
            c = 0;
            for (var i = 0; i < x.digits.length; ++i) {
                n = 0 - result.digits[i] + c;
                result.digits[i] = n % biRadix;
                // Stupid non-conforming modulus operation.
                if (result.digits[i] < 0)
                    result.digits[i] += biRadix;
                c = 0 - Number(n < 0);
            }
            // Result is opposite sign of arguments.
            result.isNeg = !x.isNeg;
        } else {
            // Result is same sign.
            result.isNeg = x.isNeg;
        }
    }
    return result;
};

RSAUtils.biHighIndex = function (x) {
    var result = x.digits.length - 1;
    while (result > 0 && x.digits[result] == 0)
        --result;
    return result;
};

RSAUtils.biNumBits = function (x) {
    var n = RSAUtils.biHighIndex(x);
    var d = x.digits[n];
    var m = (n + 1) * bitsPerDigit;
    var result;
    for (result = m; result > m - bitsPerDigit; --result) {
        if ((d & 0x8000) != 0)
            break;
        d <<= 1;
    }
    return result;
};

RSAUtils.biMultiply = function (x, y) {
    var result = new BigInt();
    var c;
    var n = RSAUtils.biHighIndex(x);
    var t = RSAUtils.biHighIndex(y);
    var u,
    uv,
    k;

    for (var i = 0; i <= t; ++i) {
        c = 0;
        k = i;
        for (j = 0; j <= n; ++j, ++k) {
            uv = result.digits[k] + x.digits[j] * y.digits[i] + c;
            result.digits[k] = uv & maxDigitVal;
            c = uv >>> biRadixBits;
            //c = Math.floor(uv / biRadix);
        }
        result.digits[i + n + 1] = c;
    }
    // Someone give me a logical xor, please.
    result.isNeg = x.isNeg != y.isNeg;
    return result;
};

RSAUtils.biMultiplyDigit = function (x, y) {
    var n,
    c,
    uv;

    result = new BigInt();
    n = RSAUtils.biHighIndex(x);
    c = 0;
    for (var j = 0; j <= n; ++j) {
        uv = result.digits[j] + x.digits[j] * y + c;
        result.digits[j] = uv & maxDigitVal;
        c = uv >>> biRadixBits;
        //c = Math.floor(uv / biRadix);
    }
    result.digits[1 + n] = c;
    return result;
};

RSAUtils.arrayCopy = function (src, srcStart, dest, destStart, n) {
    var m = Math.min(srcStart + n, src.length);
    for (var i = srcStart, j = destStart; i < m; ++i, ++j) {
        dest[j] = src[i];
    }
};

var highBitMasks = [0x0000, 0x8000, 0xC000, 0xE000, 0xF000, 0xF800,
    0xFC00, 0xFE00, 0xFF00, 0xFF80, 0xFFC0, 0xFFE0,
    0xFFF0, 0xFFF8, 0xFFFC, 0xFFFE, 0xFFFF];

RSAUtils.biShiftLeft = function (x, n) {
    var digitCount = Math.floor(n / bitsPerDigit);
    var result = new BigInt();
    RSAUtils.arrayCopy(x.digits, 0, result.digits, digitCount,
        result.digits.length - digitCount);
    var bits = n % bitsPerDigit;
    var rightBits = bitsPerDigit - bits;
    for (var i = result.digits.length - 1, i1 = i - 1; i > 0; --i, --i1) {
        result.digits[i] = ((result.digits[i] << bits) & maxDigitVal) |
        ((result.digits[i1] & highBitMasks[bits]) >>>
            (rightBits));
    }
    result.digits[0] = ((result.digits[i] << bits) & maxDigitVal);
    result.isNeg = x.isNeg;
    return result;
};

var lowBitMasks = [0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F,
    0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF,
    0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF];

RSAUtils.biShiftRight = function (x, n) {
    var digitCount = Math.floor(n / bitsPerDigit);
    var result = new BigInt();
    RSAUtils.arrayCopy(x.digits, digitCount, result.digits, 0,
        x.digits.length - digitCount);
    var bits = n % bitsPerDigit;
    var leftBits = bitsPerDigit - bits;
    for (var i = 0, i1 = i + 1; i < result.digits.length - 1; ++i, ++i1) {
        result.digits[i] = (result.digits[i] >>> bits) |
        ((result.digits[i1] & lowBitMasks[bits]) << leftBits);
    }
    result.digits[result.digits.length - 1] >>>= bits;
    result.isNeg = x.isNeg;
    return result;
};

RSAUtils.biMultiplyByRadixPower = function (x, n) {
    var result = new BigInt();
    RSAUtils.arrayCopy(x.digits, 0, result.digits, n, result.digits.length - n);
    return result;
};

RSAUtils.biDivideByRadixPower = function (x, n) {
    var result = new BigInt();
    RSAUtils.arrayCopy(x.digits, n, result.digits, 0, result.digits.length - n);
    return result;
};

RSAUtils.biModuloByRadixPower = function (x, n) {
    var result = new BigInt();
    RSAUtils.arrayCopy(x.digits, 0, result.digits, 0, n);
    return result;
};

RSAUtils.biCompare = function (x, y) {
    if (x.isNeg != y.isNeg) {
        return 1 - 2 * Number(x.isNeg);
    }
    for (var i = x.digits.length - 1; i >= 0; --i) {
        if (x.digits[i] != y.digits[i]) {
            if (x.isNeg) {
                return 1 - 2 * Number(x.digits[i] > y.digits[i]);
            } else {
                return 1 - 2 * Number(x.digits[i] < y.digits[i]);
            }
        }
    }
    return 0;
};

RSAUtils.biDivideModulo = function (x, y) {
    var nb = RSAUtils.biNumBits(x);
    var tb = RSAUtils.biNumBits(y);
    var origYIsNeg = y.isNeg;
    var q,
    r;
    if (nb < tb) {
        // |x| < |y|
        if (x.isNeg) {
            q = RSAUtils.biCopy(bigOne);
            q.isNeg = !y.isNeg;
            x.isNeg = false;
            y.isNeg = false;
            r = biSubtract(y, x);
            // Restore signs, 'cause they're references.
            x.isNeg = true;
            y.isNeg = origYIsNeg;
        } else {
            q = new BigInt();
            r = RSAUtils.biCopy(x);
        }
        return [q, r];
    }

    q = new BigInt();
    r = x;

    // Normalize Y.
    var t = Math.ceil(tb / bitsPerDigit) - 1;
    var lambda = 0;
    while (y.digits[t] < biHalfRadix) {
        y = RSAUtils.biShiftLeft(y, 1);
        ++lambda;
        ++tb;
        t = Math.ceil(tb / bitsPerDigit) - 1;
    }
    // Shift r over to keep the quotient constant. We'll shift the
    // remainder back at the end.
    r = RSAUtils.biShiftLeft(r, lambda);
    nb += lambda; // Update the bit count for x.
    var n = Math.ceil(nb / bitsPerDigit) - 1;

    var b = RSAUtils.biMultiplyByRadixPower(y, n - t);
    while (RSAUtils.biCompare(r, b) != -1) {
        ++q.digits[n - t];
        r = RSAUtils.biSubtract(r, b);
    }
    for (var i = n; i > t; --i) {
        var ri = (i >= r.digits.length) ? 0 : r.digits[i];
        var ri1 = (i - 1 >= r.digits.length) ? 0 : r.digits[i - 1];
        var ri2 = (i - 2 >= r.digits.length) ? 0 : r.digits[i - 2];
        var yt = (t >= y.digits.length) ? 0 : y.digits[t];
        var yt1 = (t - 1 >= y.digits.length) ? 0 : y.digits[t - 1];
        if (ri == yt) {
            q.digits[i - t - 1] = maxDigitVal;
        } else {
            q.digits[i - t - 1] = Math.floor((ri * biRadix + ri1) / yt);
        }

        var c1 = q.digits[i - t - 1] * ((yt * biRadix) + yt1);
        var c2 = (ri * biRadixSquared) + ((ri1 * biRadix) + ri2);
        while (c1 > c2) {
            --q.digits[i - t - 1];
            c1 = q.digits[i - t - 1] * ((yt * biRadix) | yt1);
            c2 = (ri * biRadix * biRadix) + ((ri1 * biRadix) + ri2);
        }

        b = RSAUtils.biMultiplyByRadixPower(y, i - t - 1);
        r = RSAUtils.biSubtract(r, RSAUtils.biMultiplyDigit(b, q.digits[i - t - 1]));
        if (r.isNeg) {
            r = RSAUtils.biAdd(r, b);
            --q.digits[i - t - 1];
        }
    }
    r = RSAUtils.biShiftRight(r, lambda);
    // Fiddle with the signs and stuff to make sure that 0 <= r < y.
    q.isNeg = x.isNeg != origYIsNeg;
    if (x.isNeg) {
        if (origYIsNeg) {
            q = RSAUtils.biAdd(q, bigOne);
        } else {
            q = RSAUtils.biSubtract(q, bigOne);
        }
        y = RSAUtils.biShiftRight(y, lambda);
        r = RSAUtils.biSubtract(y, r);
    }
    // Check for the unbelievably stupid degenerate case of r == -0.
    if (r.digits[0] == 0 && RSAUtils.biHighIndex(r) == 0)
        r.isNeg = false;

    return [q, r];
};

RSAUtils.biDivide = function (x, y) {
    return RSAUtils.biDivideModulo(x, y)[0];
};

RSAUtils.biModulo = function (x, y) {
    return RSAUtils.biDivideModulo(x, y)[1];
};

RSAUtils.biMultiplyMod = function (x, y, m) {
    return RSAUtils.biModulo(RSAUtils.biMultiply(x, y), m);
};

RSAUtils.biPow = function (x, y) {
    var result = bigOne;
    var a = x;
    while (true) {
        if ((y & 1) != 0)
            result = RSAUtils.biMultiply(result, a);
        y >>= 1;
        if (y == 0)
            break;
        a = RSAUtils.biMultiply(a, a);
    }
    return result;
};

RSAUtils.biPowMod = function (x, y, m) {
    var result = bigOne;
    var a = x;
    var k = y;
    while (true) {
        if ((k.digits[0] & 1) != 0)
            result = RSAUtils.biMultiplyMod(result, a, m);
        k = RSAUtils.biShiftRight(k, 1);
        if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0)
            break;
        a = RSAUtils.biMultiplyMod(a, a, m);
    }
    return result;
};

window.BarrettMu = function (m) {
    this.modulus = RSAUtils.biCopy(m);
    this.k = RSAUtils.biHighIndex(this.modulus) + 1;
    var b2k = new BigInt();
    b2k.digits[2 * this.k] = 1; // b2k = b^(2k)
    this.mu = RSAUtils.biDivide(b2k, this.modulus);
    this.bkplus1 = new BigInt();
    this.bkplus1.digits[this.k + 1] = 1; // bkplus1 = b^(k+1)
    this.modulo = BarrettMu_modulo;
    this.multiplyMod = BarrettMu_multiplyMod;
    this.powMod = BarrettMu_powMod;
};

function BarrettMu_modulo(x) {
    var $dmath = RSAUtils;
    var q1 = $dmath.biDivideByRadixPower(x, this.k - 1);
    var q2 = $dmath.biMultiply(q1, this.mu);
    var q3 = $dmath.biDivideByRadixPower(q2, this.k + 1);
    var r1 = $dmath.biModuloByRadixPower(x, this.k + 1);
    var r2term = $dmath.biMultiply(q3, this.modulus);
    var r2 = $dmath.biModuloByRadixPower(r2term, this.k + 1);
    var r = $dmath.biSubtract(r1, r2);
    if (r.isNeg) {
        r = $dmath.biAdd(r, this.bkplus1);
    }
    var rgtem = $dmath.biCompare(r, this.modulus) >= 0;
    while (rgtem) {
        r = $dmath.biSubtract(r, this.modulus);
        rgtem = $dmath.biCompare(r, this.modulus) >= 0;
    }
    return r;
}

function BarrettMu_multiplyMod(x, y) {
    /*
    x = this.modulo(x);
    y = this.modulo(y);
     */
    var xy = RSAUtils.biMultiply(x, y);
    return this.modulo(xy);
}

function BarrettMu_powMod(x, y) {
    var result = new BigInt();
    result.digits[0] = 1;
    var a = x;
    var k = y;
    while (true) {
        if ((k.digits[0] & 1) != 0)
            result = this.multiplyMod(result, a);
        k = RSAUtils.biShiftRight(k, 1);
        if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0)
            break;
        a = this.multiplyMod(a, a);
    }
    return result;
}

var RSAKeyPair = function (encryptionExponent, decryptionExponent, modulus) {
    alert(1);
    var $dmath = RSAUtils;
    this.e = $dmath.biFromHex(encryptionExponent);
    this.d = $dmath.biFromHex(decryptionExponent);
    this.m = $dmath.biFromHex(modulus);
    // We can do two bytes per digit, so
    // chunkSize = 2 * (number of digits in modulus - 1).
    // Since biHighIndex returns the high index, not the number of digits, 1 has
    // already been subtracted.
    this.chunkSize = 2 * $dmath.biHighIndex(this.m);
    this.radix = 16;
    this.barrett = new window.BarrettMu(this.m);
};

RSAUtils.getKeyPair = function (encryptionExponent, decryptionExponent, modulus) {
    return new RSAKeyPair(encryptionExponent, decryptionExponent, modulus);
};

if (typeof window.twoDigit === 'undefined') {
    window.twoDigit = function (n) {
        return (n < 10 ? "0" : "") + String(n);
    };
}

// Altered by Rob Saunders ([e-mail]). New routine pads the
// string after it has been converted to an array. This fixes an
// incompatibility with Flash MX's ActionScript.
RSAUtils.encryptedString = function (key, s) {
    var a = [];
    var sl = s.length;
    var i = 0;
    while (i < sl) {
        a[i] = s.charCodeAt(i);
        i++;
    }
    while (a.length % key.chunkSize != 0) {
        a[i++] = 0;
    }

    var al = a.length;
    var result = "";
    var j,
    k,
    block;
    for (i = 0; i < al; i += key.chunkSize) {
        block = new BigInt();
        j = 0;
        for (k = i; k < i + key.chunkSize; ++j) {
            block.digits[j] = a[k++];
            block.digits[j] += a[k++] << 8;
        }
        var crypt = key.barrett.powMod(block, key.e);
        var text = key.radix == 16 ? RSAUtils.biToHex(crypt) : RSAUtils.biToString(crypt, key.radix);
        result += text + " ";
    }
    return result.substring(0, result.length - 1); // Remove last space.
};

RSAUtils.decryptedString = function (key, s) {
    var blocks = s.split(" ");
    var result = "";
    var i,
    j,
    block;
    for (i = 0; i < blocks.length; ++i) {
        var bi;
        if (key.radix == 16) {
            bi = RSAUtils.biFromHex(blocks[i]);
        } else {
            bi = RSAUtils.biFromString(blocks[i], key.radix);
        }
        block = key.barrett.powMod(bi, key.d);
        for (j = 0; j <= RSAUtils.biHighIndex(block); ++j) {
            result += String.fromCharCode(block.digits[j] & 255,
                block.digits[j] >> 8);
        }
    }
    // Remove trailing null, if any.
    if (result.charCodeAt(result.length - 1) == 0) {
        result = result.substring(0, result.length - 1);
    }
    return result;
};

RSAUtils.setMaxDigits(130);
// RSA 庫前端開源部分 - 結束

// 以下為LR調用RSA加密實現的關鍵代碼
function createEncrypt() {
    //LR.loadLibrary('rsaiutil.js');
    //mobileNumberSet;//輸入的手機號
    //pwdSet;//輸入的密碼
    //imgVerifyCodeSet;//輸入的圖形驗證碼

    // 通過 LR.getParam('mobileNumberSet') 可以在 JS 腳本中直接獲取 LR 腳本的參數
    var cliPublicKey = new RSAUtils.getKeyPair(LR.getParam('getDataExponent'), "", LR.getParam('getDataModulus'));
    var encrypt = "mobileNumber=" + LR.getParam('mobileNumberSet') + "&pwd=" + LR.getParam('pwdSet') + "&imgVerifyCode=" + LR.getParam('imgVerifyCodeSet');//
    encrypt = encrypt.split("").reverse().join("");//將需要加密的字符串反序排列
    encrypt = RSAUtils.encryptedString(cliPublicKey, encrypt); //獲得加密后的字符串
    return encrypt;
}

運行 Action 的結果：

虛擬用戶腳本已於 : 2018/2/24 Saturday PM 4:05:06 啟動
正在開始操作 vuser_init。
LoadRunner 12.53.0 (Windows 7) 的 Web Turbo 回放；內部版本 1203 (二月 24 2018 19:13:20)      [MsgId: MMSG-26983]
運行模式: HTML      [MsgId: MMSG-26993]
回放用戶代理: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)      [MsgId: MMSG-26988]
運行時設置文件: "C:\Users\VuGen\Scripts\WebHttpHtml6\\default.cfg"      [MsgId: MMSG-27141]
正在結束操作 vuser_init。
正在運行 Vuser...
正在開始迭代 1。
每個服務器的最大並發連接數: 6      [MsgId: MMSG-26989]
正在開始操作 Action。
Action.c(24): web_reg_save_param 已啟動      [MsgId: MMSG-26355]
Action.c(24): 注冊 web_reg_save_param 成功      [MsgId: MMSG-26390]
Action.c(26): web_submit_data("encryptKey.action") 已啟動      [MsgId: MMSG-26355]
Action.c(26): web_submit_data("encryptKey.action") 已成功，613 個正文字節，155 個標頭字節      [MsgId: MMSG-26386]
Action.c(36): # 獲取密鑰響應內容體：
{"publicKey":"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBEZM4rLUDmybC9qFGLUwTFNsAbUFxyb\/SDTPr\nfVVgrkg1PL4yTOFyHgJe5oMcZyR0hqdz8fGpkesiN20dWwUem67tAszHgIHcVuswwyT2nV7pUNMj\nz53v5QWHsZ6\/oW1LXVnGYwvjVATHc1p2VOuATGw28XDEukWyGcKzTtcwzwIDAQAB\n","error_msg":"ok","error_code":0,"exponent":"010001","rKey":"5406701c505548beb3c1043bbcee5229","modulus":"00c1119338acb5039b26c2f6a1462d4c1314db006d4171c9bfd20d33eb7d5560ae48353cbe324ce1721e025ee6831c67247486a773f1f1a991eb22376d1d5b051e9baeed02ccc78081dc56eb30c324f69d5ee950d323cf9defe50587b19ebfa16d4b5d59c6630be35404c7735a7654eb804c6c36f170c4ba45b219c2b34ed730cf"}
Action.c(38): web_js_run 已啟動      [MsgId: MMSG-26355]
Action.c(38): web_js_run 已成功      [MsgId: MMSG-26392]
Action.c(45): web_js_run 已啟動      [MsgId: MMSG-26355]
Action.c(45): web_js_run 已成功      [MsgId: MMSG-26392]
Action.c(52): web_js_run 已啟動      [MsgId: MMSG-26355]
Action.c(52): web_js_run 已成功      [MsgId: MMSG-26392]
Action.c(59): web_js_run 已啟動      [MsgId: MMSG-26355]
Action.c(59): web_js_run 已成功      [MsgId: MMSG-26392]
Action.c(66): # getDataPublicKey 的值為：
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBEZM4rLUDmybC9qFGLUwTFNsAbUFxyb/SDTPr\nfVVgrkg1PL4yTOFyHgJe5oMcZyR0hqdz8fGpkesiN20dWwUem67tAszHgIHcVuswwyT2nV7pUNMj\nz53v5QWHsZ6/oW1LXVnGYwvjVATHc1p2VOuATGw28XDEukWyGcKzTtcwzwIDAQAB\n
Action.c(67): # getDataExponent 的值為：
010001
Action.c(68): # getDatarKey 的值為：
5406701c505548beb3c1043bbcee5229
Action.c(69): # getDataModulus 的值為：
00c1119338acb5039b26c2f6a1462d4c1314db006d4171c9bfd20d33eb7d5560ae48353cbe324ce1721e025ee6831c67247486a773f1f1a991eb22376d1d5b051e9baeed02ccc78081dc56eb30c324f69d5ee950d323cf9defe50587b19ebfa16d4b5d59c6630be35404c7735a7654eb804c6c36f170c4ba45b219c2b34ed730cf
Action.c(109): web_js_run 已啟動      [MsgId: MMSG-26355]
Alert from JS (len=1): 1
Action.c(109): web_js_run 已成功      [MsgId: MMSG-26392]
Action.c(117): # NewkeyEncrypt 的值為：
4ea861aa44b8d90b08677e525ebd2607a992b87108308329fb01afd518bf4104344cb26e149ec43416a8181ad4cfc7e358e9ca2a2eab0a9072e5d86182e91f524376a3414b268244c62a2e149ac905679f66dd455ea386537136660508a3af71b479df9dc7beaf21ef5f2e70edfad8e88c64af35415e68258599c4b09791e43e
Action.c(121): web_reg_save_param 已啟動      [MsgId: MMSG-26355]
Action.c(121): 注冊 web_reg_save_param 成功      [MsgId: MMSG-26390]
Action.c(123): web_custom_request("userPwdLogin.action") 已啟動      [MsgId: MMSG-26355]
Action.c(123): web_custom_request("userPwdLogin.action") 已成功，490 個正文字節，155 個標頭字節      [MsgId: MMSG-26386]
Action.c(137): # newTokenJson 的值為：
{"portraitUrl":"http:\/\/test.666.com\/pt\/com\/img\/default-doctor-portrait.jpg","userGuideStat":null,"error_msg":"鐧誨綍鎴愬姛","nickname":"鍖昏€?6","alias":"dev473002","token":"cbc70505fccd4866aa88f3404a4ab8d1","error_code":0,"tag":"dev鍖葷敓","user_id":473002,"portraitUuid":"","type":"鍖葷敓","statistics":{"dtOnlinePrescOrdersPaid":0,"userId":473002,"role":"dt","dtOnlinePrescOrders":170,"lastLoginTime":"201802","registerTime":"2017-05-16 10:47:51","dtQualified":true}}
Action.c(138): # newTokenJsonUTF 的值為：
{"portraitUrl":"http:\/\/test.666.com\/pt\/com\/img\/default-doctor-portrait.jpg","userGuideStat":null,"error_msg":"登錄成功","nickname":"醫者26","alias":"dev473002","token":"cbc70505fccd4866aa88f3404a4ab8d1","error_code":0,"tag":"dev侵權者","user_id":473002,"portraitUuid":"","type":"侵權者","statistics":{"dtOnlinePrescOrdersPaid":0,"userId":473002,"role":"dt","dtOnlinePrescOrders":170,"lastLoginTime":"201802","registerTime":"2017-05-16 10:47:51","dtQualified":true}}
JS執行結果：0
正在結束操作 Action。
正在結束迭代 1。
正在結束 Vuser...
正在開始操作 vuser_end。
正在結束操作 vuser_end。
Vuser 已終止。

另：開源的 RSA庫 在未修改時，是獨立的一個 JS 文件；未修改前是長這樣：

/*
 * RSA, a suite of routines for performing RSA public-key computations in JavaScript.
 * Copyright 1998-2005 David Shapiro.
 * Dave Shapiro
 * [e-mail]
 * changed by Fuchun, 2010-05-06
 * [e-mail]
 */

(function ($w) {

    if (typeof $w.RSAUtils === 'undefined')
        var RSAUtils = $w.RSAUtils = {};

    var biRadixBase = 2;
    var biRadixBits = 16;
    var bitsPerDigit = biRadixBits;
    var biRadix = 1 << 16; // = 2^16 = 65536
    var biHalfRadix = biRadix >>> 1;
    var biRadixSquared = biRadix * biRadix;
    var maxDigitVal = biRadix - 1;
    var maxInteger = 9999999999999998;

    //maxDigits:
    //Change this to accommodate your largest number size. Use setMaxDigits()
    //to change it!
    //
    //In general, if you're working with numbers of size N bits, you'll need 2*N
    //bits of storage. Each digit holds 16 bits. So, a 1024-bit key will need
    //
    //1024 * 2 / 16 = 128 digits of storage.
    //
    var maxDigits;
    var ZERO_ARRAY;
    var bigZero,
    bigOne;

    var BigInt = $w.BigInt = function (flag) {
        if (typeof flag == "boolean" && flag == true) {
            this.digits = null;
        } else {
            this.digits = ZERO_ARRAY.slice(0);
        }
        this.isNeg = false;
    };

    RSAUtils.setMaxDigits = function (value) {
        maxDigits = value;
        ZERO_ARRAY = new Array(maxDigits);
        for (var iza = 0; iza < ZERO_ARRAY.length; iza++)
            ZERO_ARRAY[iza] = 0;
        bigZero = new BigInt();
        bigOne = new BigInt();
        bigOne.digits[0] = 1;
    };
    RSAUtils.setMaxDigits(20);

    //The maximum number of digits in base 10 you can convert to an
    //integer without JavaScript throwing up on you.
    var dpl10 = 15;

    RSAUtils.biFromNumber = function (i) {
        var result = new BigInt();
        result.isNeg = i < 0;
        i = Math.abs(i);
        var j = 0;
        while (i > 0) {
            result.digits[j++] = i & maxDigitVal;
            i = Math.floor(i / biRadix);
        }
        return result;
    };

    //lr10 = 10 ^ dpl10
    var lr10 = RSAUtils.biFromNumber(1000000000000000);

    RSAUtils.biFromDecimal = function (s) {
        var isNeg = s.charAt(0) == '-';
        var i = isNeg ? 1 : 0;
        var result;
        // Skip leading zeros.
        while (i < s.length && s.charAt(i) == '0')
            ++i;
        if (i == s.length) {
            result = new BigInt();
        } else {
            var digitCount = s.length - i;
            var fgl = digitCount % dpl10;
            if (fgl == 0)
                fgl = dpl10;
            result = RSAUtils.biFromNumber(Number(s.substr(i, fgl)));
            i += fgl;
            while (i < s.length) {
                result = RSAUtils.biAdd(RSAUtils.biMultiply(result, lr10),
                        RSAUtils.biFromNumber(Number(s.substr(i, dpl10))));
                i += dpl10;
            }
            result.isNeg = isNeg;
        }
        return result;
    };

    RSAUtils.biCopy = function (bi) {
        var result = new BigInt(true);
        result.digits = bi.digits.slice(0);
        result.isNeg = bi.isNeg;
        return result;
    };

    RSAUtils.reverseStr = function (s) {
        var result = "";
        for (var i = s.length - 1; i > -1; --i) {
            result += s.charAt(i);
        }
        return result;
    };

    var hexatrigesimalToChar = [
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
        'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
        'u', 'v', 'w', 'x', 'y', 'z'
    ];

    RSAUtils.biToString = function (x, radix) { // 2 <= radix <= 36
        var b = new BigInt();
        b.digits[0] = radix;
        var qr = RSAUtils.biDivideModulo(x, b);
        var result = hexatrigesimalToChar[qr[1].digits[0]];
        while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
            qr = RSAUtils.biDivideModulo(qr[0], b);
            digit = qr[1].digits[0];
            result += hexatrigesimalToChar[qr[1].digits[0]];
        }
        return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
    };

    RSAUtils.biToDecimal = function (x) {
        var b = new BigInt();
        b.digits[0] = 10;
        var qr = RSAUtils.biDivideModulo(x, b);
        var result = String(qr[1].digits[0]);
        while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
            qr = RSAUtils.biDivideModulo(qr[0], b);
            result += String(qr[1].digits[0]);
        }
        return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
    };

    var hexToChar = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
        'a', 'b', 'c', 'd', 'e', 'f'];

    RSAUtils.digitToHex = function (n) {
        var mask = 0xf;
        var result = "";
        for (i = 0; i < 4; ++i) {
            result += hexToChar[n & mask];
            n >>>= 4;
        }
        return RSAUtils.reverseStr(result);
    };

    RSAUtils.biToHex = function (x) {
        var result = "";
        var n = RSAUtils.biHighIndex(x);
        for (var i = RSAUtils.biHighIndex(x); i > -1; --i) {
            result += RSAUtils.digitToHex(x.digits[i]);
        }
        return result;
    };

    RSAUtils.charToHex = function (c) {
        var ZERO = 48;
        var NINE = ZERO + 9;
        var littleA = 97;
        var littleZ = littleA + 25;
        var bigA = 65;
        var bigZ = 65 + 25;
        var result;

        if (c >= ZERO && c <= NINE) {
            result = c - ZERO;
        } else if (c >= bigA && c <= bigZ) {
            result = 10 + c - bigA;
        } else if (c >= littleA && c <= littleZ) {
            result = 10 + c - littleA;
        } else {
            result = 0;
        }
        return result;
    };

    RSAUtils.hexToDigit = function (s) {
        var result = 0;
        var sl = Math.min(s.length, 4);
        for (var i = 0; i < sl; ++i) {
            result <<= 4;
            result |= RSAUtils.charToHex(s.charCodeAt(i));
        }
        return result;
    };

    RSAUtils.biFromHex = function (s) {
        var result = new BigInt();
        var sl = s.length;
        for (var i = sl, j = 0; i > 0; i -= 4, ++j) {
            result.digits[j] = RSAUtils.hexToDigit(s.substr(Math.max(i - 4, 0), Math.min(i, 4)));
        }
        return result;
    };

    RSAUtils.biFromString = function (s, radix) {
        var isNeg = s.charAt(0) == '-';
        var istop = isNeg ? 1 : 0;
        var result = new BigInt();
        var place = new BigInt();
        place.digits[0] = 1; // radix^0
        for (var i = s.length - 1; i >= istop; i--) {
            var c = s.charCodeAt(i);
            var digit = RSAUtils.charToHex(c);
            var biDigit = RSAUtils.biMultiplyDigit(place, digit);
            result = RSAUtils.biAdd(result, biDigit);
            place = RSAUtils.biMultiplyDigit(place, radix);
        }
        result.isNeg = isNeg;
        return result;
    };

    RSAUtils.biDump = function (b) {
        return (b.isNeg ? "-" : "") + b.digits.join(" ");
    };

    RSAUtils.biAdd = function (x, y) {
        var result;

        if (x.isNeg != y.isNeg) {
            y.isNeg = !y.isNeg;
            result = RSAUtils.biSubtract(x, y);
            y.isNeg = !y.isNeg;
        } else {
            result = new BigInt();
            var c = 0;
            var n;
            for (var i = 0; i < x.digits.length; ++i) {
                n = x.digits[i] + y.digits[i] + c;
                result.digits[i] = n % biRadix;
                c = Number(n >= biRadix);
            }
            result.isNeg = x.isNeg;
        }
        return result;
    };

    RSAUtils.biSubtract = function (x, y) {
        var result;
        if (x.isNeg != y.isNeg) {
            y.isNeg = !y.isNeg;
            result = RSAUtils.biAdd(x, y);
            y.isNeg = !y.isNeg;
        } else {
            result = new BigInt();
            var n,
            c;
            c = 0;
            for (var i = 0; i < x.digits.length; ++i) {
                n = x.digits[i] - y.digits[i] + c;
                result.digits[i] = n % biRadix;
                // Stupid non-conforming modulus operation.
                if (result.digits[i] < 0)
                    result.digits[i] += biRadix;
                c = 0 - Number(n < 0);
            }
            // Fix up the negative sign, if any.
            if (c == -1) {
                c = 0;
                for (var i = 0; i < x.digits.length; ++i) {
                    n = 0 - result.digits[i] + c;
                    result.digits[i] = n % biRadix;
                    // Stupid non-conforming modulus operation.
                    if (result.digits[i] < 0)
                        result.digits[i] += biRadix;
                    c = 0 - Number(n < 0);
                }
                // Result is opposite sign of arguments.
                result.isNeg = !x.isNeg;
            } else {
                // Result is same sign.
                result.isNeg = x.isNeg;
            }
        }
        return result;
    };

    RSAUtils.biHighIndex = function (x) {
        var result = x.digits.length - 1;
        while (result > 0 && x.digits[result] == 0)
            --result;
        return result;
    };

    RSAUtils.biNumBits = function (x) {
        var n = RSAUtils.biHighIndex(x);
        var d = x.digits[n];
        var m = (n + 1) * bitsPerDigit;
        var result;
        for (result = m; result > m - bitsPerDigit; --result) {
            if ((d & 0x8000) != 0)
                break;
            d <<= 1;
        }
        return result;
    };

    RSAUtils.biMultiply = function (x, y) {
        var result = new BigInt();
        var c;
        var n = RSAUtils.biHighIndex(x);
        var t = RSAUtils.biHighIndex(y);
        var u,
        uv,
        k;

        for (var i = 0; i <= t; ++i) {
            c = 0;
            k = i;
            for (j = 0; j <= n; ++j, ++k) {
                uv = result.digits[k] + x.digits[j] * y.digits[i] + c;
                result.digits[k] = uv & maxDigitVal;
                c = uv >>> biRadixBits;
                //c = Math.floor(uv / biRadix);
            }
            result.digits[i + n + 1] = c;
        }
        // Someone give me a logical xor, please.
        result.isNeg = x.isNeg != y.isNeg;
        return result;
    };

    RSAUtils.biMultiplyDigit = function (x, y) {
        var n,
        c,
        uv;

        result = new BigInt();
        n = RSAUtils.biHighIndex(x);
        c = 0;
        for (var j = 0; j <= n; ++j) {
            uv = result.digits[j] + x.digits[j] * y + c;
            result.digits[j] = uv & maxDigitVal;
            c = uv >>> biRadixBits;
            //c = Math.floor(uv / biRadix);
        }
        result.digits[1 + n] = c;
        return result;
    };

    RSAUtils.arrayCopy = function (src, srcStart, dest, destStart, n) {
        var m = Math.min(srcStart + n, src.length);
        for (var i = srcStart, j = destStart; i < m; ++i, ++j) {
            dest[j] = src[i];
        }
    };

    var highBitMasks = [0x0000, 0x8000, 0xC000, 0xE000, 0xF000, 0xF800,
        0xFC00, 0xFE00, 0xFF00, 0xFF80, 0xFFC0, 0xFFE0,
        0xFFF0, 0xFFF8, 0xFFFC, 0xFFFE, 0xFFFF];

    RSAUtils.biShiftLeft = function (x, n) {
        var digitCount = Math.floor(n / bitsPerDigit);
        var result = new BigInt();
        RSAUtils.arrayCopy(x.digits, 0, result.digits, digitCount,
            result.digits.length - digitCount);
        var bits = n % bitsPerDigit;
        var rightBits = bitsPerDigit - bits;
        for (var i = result.digits.length - 1, i1 = i - 1; i > 0; --i, --i1) {
            result.digits[i] = ((result.digits[i] << bits) & maxDigitVal) |
            ((result.digits[i1] & highBitMasks[bits]) >>>
                (rightBits));
        }
        result.digits[0] = ((result.digits[i] << bits) & maxDigitVal);
        result.isNeg = x.isNeg;
        return result;
    };

    var lowBitMasks = [0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F,
        0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF,
        0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF];

    RSAUtils.biShiftRight = function (x, n) {
        var digitCount = Math.floor(n / bitsPerDigit);
        var result = new BigInt();
        RSAUtils.arrayCopy(x.digits, digitCount, result.digits, 0,
            x.digits.length - digitCount);
        var bits = n % bitsPerDigit;
        var leftBits = bitsPerDigit - bits;
        for (var i = 0, i1 = i + 1; i < result.digits.length - 1; ++i, ++i1) {
            result.digits[i] = (result.digits[i] >>> bits) |
            ((result.digits[i1] & lowBitMasks[bits]) << leftBits);
        }
        result.digits[result.digits.length - 1] >>>= bits;
        result.isNeg = x.isNeg;
        return result;
    };

    RSAUtils.biMultiplyByRadixPower = function (x, n) {
        var result = new BigInt();
        RSAUtils.arrayCopy(x.digits, 0, result.digits, n, result.digits.length - n);
        return result;
    };

    RSAUtils.biDivideByRadixPower = function (x, n) {
        var result = new BigInt();
        RSAUtils.arrayCopy(x.digits, n, result.digits, 0, result.digits.length - n);
        return result;
    };

    RSAUtils.biModuloByRadixPower = function (x, n) {
        var result = new BigInt();
        RSAUtils.arrayCopy(x.digits, 0, result.digits, 0, n);
        return result;
    };

    RSAUtils.biCompare = function (x, y) {
        if (x.isNeg != y.isNeg) {
            return 1 - 2 * Number(x.isNeg);
        }
        for (var i = x.digits.length - 1; i >= 0; --i) {
            if (x.digits[i] != y.digits[i]) {
                if (x.isNeg) {
                    return 1 - 2 * Number(x.digits[i] > y.digits[i]);
                } else {
                    return 1 - 2 * Number(x.digits[i] < y.digits[i]);
                }
            }
        }
        return 0;
    };

    RSAUtils.biDivideModulo = function (x, y) {
        var nb = RSAUtils.biNumBits(x);
        var tb = RSAUtils.biNumBits(y);
        var origYIsNeg = y.isNeg;
        var q,
        r;
        if (nb < tb) {
            // |x| < |y|
            if (x.isNeg) {
                q = RSAUtils.biCopy(bigOne);
                q.isNeg = !y.isNeg;
                x.isNeg = false;
                y.isNeg = false;
                r = biSubtract(y, x);
                // Restore signs, 'cause they're references.
                x.isNeg = true;
                y.isNeg = origYIsNeg;
            } else {
                q = new BigInt();
                r = RSAUtils.biCopy(x);
            }
            return [q, r];
        }

        q = new BigInt();
        r = x;

        // Normalize Y.
        var t = Math.ceil(tb / bitsPerDigit) - 1;
        var lambda = 0;
        while (y.digits[t] < biHalfRadix) {
            y = RSAUtils.biShiftLeft(y, 1);
            ++lambda;
            ++tb;
            t = Math.ceil(tb / bitsPerDigit) - 1;
        }
        // Shift r over to keep the quotient constant. We'll shift the
        // remainder back at the end.
        r = RSAUtils.biShiftLeft(r, lambda);
        nb += lambda; // Update the bit count for x.
        var n = Math.ceil(nb / bitsPerDigit) - 1;

        var b = RSAUtils.biMultiplyByRadixPower(y, n - t);
        while (RSAUtils.biCompare(r, b) != -1) {
            ++q.digits[n - t];
            r = RSAUtils.biSubtract(r, b);
        }
        for (var i = n; i > t; --i) {
            var ri = (i >= r.digits.length) ? 0 : r.digits[i];
            var ri1 = (i - 1 >= r.digits.length) ? 0 : r.digits[i - 1];
            var ri2 = (i - 2 >= r.digits.length) ? 0 : r.digits[i - 2];
            var yt = (t >= y.digits.length) ? 0 : y.digits[t];
            var yt1 = (t - 1 >= y.digits.length) ? 0 : y.digits[t - 1];
            if (ri == yt) {
                q.digits[i - t - 1] = maxDigitVal;
            } else {
                q.digits[i - t - 1] = Math.floor((ri * biRadix + ri1) / yt);
            }

            var c1 = q.digits[i - t - 1] * ((yt * biRadix) + yt1);
            var c2 = (ri * biRadixSquared) + ((ri1 * biRadix) + ri2);
            while (c1 > c2) {
                --q.digits[i - t - 1];
                c1 = q.digits[i - t - 1] * ((yt * biRadix) | yt1);
                c2 = (ri * biRadix * biRadix) + ((ri1 * biRadix) + ri2);
            }

            b = RSAUtils.biMultiplyByRadixPower(y, i - t - 1);
            r = RSAUtils.biSubtract(r, RSAUtils.biMultiplyDigit(b, q.digits[i - t - 1]));
            if (r.isNeg) {
                r = RSAUtils.biAdd(r, b);
                --q.digits[i - t - 1];
            }
        }
        r = RSAUtils.biShiftRight(r, lambda);
        // Fiddle with the signs and stuff to make sure that 0 <= r < y.
        q.isNeg = x.isNeg != origYIsNeg;
        if (x.isNeg) {
            if (origYIsNeg) {
                q = RSAUtils.biAdd(q, bigOne);
            } else {
                q = RSAUtils.biSubtract(q, bigOne);
            }
            y = RSAUtils.biShiftRight(y, lambda);
            r = RSAUtils.biSubtract(y, r);
        }
        // Check for the unbelievably stupid degenerate case of r == -0.
        if (r.digits[0] == 0 && RSAUtils.biHighIndex(r) == 0)
            r.isNeg = false;

        return [q, r];
    };

    RSAUtils.biDivide = function (x, y) {
        return RSAUtils.biDivideModulo(x, y)[0];
    };

    RSAUtils.biModulo = function (x, y) {
        return RSAUtils.biDivideModulo(x, y)[1];
    };

    RSAUtils.biMultiplyMod = function (x, y, m) {
        return RSAUtils.biModulo(RSAUtils.biMultiply(x, y), m);
    };

    RSAUtils.biPow = function (x, y) {
        var result = bigOne;
        var a = x;
        while (true) {
            if ((y & 1) != 0)
                result = RSAUtils.biMultiply(result, a);
            y >>= 1;
            if (y == 0)
                break;
            a = RSAUtils.biMultiply(a, a);
        }
        return result;
    };

    RSAUtils.biPowMod = function (x, y, m) {
        var result = bigOne;
        var a = x;
        var k = y;
        while (true) {
            if ((k.digits[0] & 1) != 0)
                result = RSAUtils.biMultiplyMod(result, a, m);
            k = RSAUtils.biShiftRight(k, 1);
            if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0)
                break;
            a = RSAUtils.biMultiplyMod(a, a, m);
        }
        return result;
    };

    $w.BarrettMu = function (m) {
        this.modulus = RSAUtils.biCopy(m);
        this.k = RSAUtils.biHighIndex(this.modulus) + 1;
        var b2k = new BigInt();
        b2k.digits[2 * this.k] = 1; // b2k = b^(2k)
        this.mu = RSAUtils.biDivide(b2k, this.modulus);
        this.bkplus1 = new BigInt();
        this.bkplus1.digits[this.k + 1] = 1; // bkplus1 = b^(k+1)
        this.modulo = BarrettMu_modulo;
        this.multiplyMod = BarrettMu_multiplyMod;
        this.powMod = BarrettMu_powMod;
    };

    function BarrettMu_modulo(x) {
        var $dmath = RSAUtils;
        var q1 = $dmath.biDivideByRadixPower(x, this.k - 1);
        var q2 = $dmath.biMultiply(q1, this.mu);
        var q3 = $dmath.biDivideByRadixPower(q2, this.k + 1);
        var r1 = $dmath.biModuloByRadixPower(x, this.k + 1);
        var r2term = $dmath.biMultiply(q3, this.modulus);
        var r2 = $dmath.biModuloByRadixPower(r2term, this.k + 1);
        var r = $dmath.biSubtract(r1, r2);
        if (r.isNeg) {
            r = $dmath.biAdd(r, this.bkplus1);
        }
        var rgtem = $dmath.biCompare(r, this.modulus) >= 0;
        while (rgtem) {
            r = $dmath.biSubtract(r, this.modulus);
            rgtem = $dmath.biCompare(r, this.modulus) >= 0;
        }
        return r;
    }

    function BarrettMu_multiplyMod(x, y) {
        /*
        x = this.modulo(x);
        y = this.modulo(y);
         */
        var xy = RSAUtils.biMultiply(x, y);
        return this.modulo(xy);
    }

    function BarrettMu_powMod(x, y) {
        var result = new BigInt();
        result.digits[0] = 1;
        var a = x;
        var k = y;
        while (true) {
            if ((k.digits[0] & 1) != 0)
                result = this.multiplyMod(result, a);
            k = RSAUtils.biShiftRight(k, 1);
            if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0)
                break;
            a = this.multiplyMod(a, a);
        }
        return result;
    }

    var RSAKeyPair = function (encryptionExponent, decryptionExponent, modulus) {
        var $dmath = RSAUtils;
        this.e = $dmath.biFromHex(encryptionExponent);
        this.d = $dmath.biFromHex(decryptionExponent);
        this.m = $dmath.biFromHex(modulus);
        // We can do two bytes per digit, so
        // chunkSize = 2 * (number of digits in modulus - 1).
        // Since biHighIndex returns the high index, not the number of digits, 1 has
        // already been subtracted.
        this.chunkSize = 2 * $dmath.biHighIndex(this.m);
        this.radix = 16;
        this.barrett = new $w.BarrettMu(this.m);
    };

    RSAUtils.getKeyPair = function (encryptionExponent, decryptionExponent, modulus) {
        return new RSAKeyPair(encryptionExponent, decryptionExponent, modulus);
    };

    if (typeof $w.twoDigit === 'undefined') {
        $w.twoDigit = function (n) {
            return (n < 10 ? "0" : "") + String(n);
        };
    }

    // Altered by Rob Saunders ([e-mail]). New routine pads the
    // string after it has been converted to an array. This fixes an
    // incompatibility with Flash MX's ActionScript.
    RSAUtils.encryptedString = function (key, s) {
        var a = [];
        var sl = s.length;
        var i = 0;
        while (i < sl) {
            a[i] = s.charCodeAt(i);
            i++;
        }
        while (a.length % key.chunkSize != 0) {
            a[i++] = 0;
        }

        var al = a.length;
        var result = "";
        var j,
        k,
        block;
        for (i = 0; i < al; i += key.chunkSize) {
            block = new BigInt();
            j = 0;
            for (k = i; k < i + key.chunkSize; ++j) {
                block.digits[j] = a[k++];
                block.digits[j] += a[k++] << 8;
            }
            var crypt = key.barrett.powMod(block, key.e);
            var text = key.radix == 16 ? RSAUtils.biToHex(crypt) : RSAUtils.biToString(crypt, key.radix);
            result += text + " ";
        }
        return result.substring(0, result.length - 1); // Remove last space.
    };

    RSAUtils.decryptedString = function (key, s) {
        var blocks = s.split(" ");
        var result = "";
        var i,
        j,
        block;
        for (i = 0; i < blocks.length; ++i) {
            var bi;
            if (key.radix == 16) {
                bi = RSAUtils.biFromHex(blocks[i]);
            } else {
                bi = RSAUtils.biFromString(blocks[i], key.radix);
            }
            block = key.barrett.powMod(bi, key.d);
            for (j = 0; j <= RSAUtils.biHighIndex(block); ++j) {
                result += String.fromCharCode(block.digits[j] & 255,
                    block.digits[j] >> 8);
            }
        }
        // Remove trailing null, if any.
        if (result.charCodeAt(result.length - 1) == 0) {
            result = result.substring(0, result.length - 1);
        }
        return result;
    };

    RSAUtils.setMaxDigits(130);

})(window);