jsのdes加解密

/*** DES加密解密* @Copyright Copyright (c) 2006* @author Guapo* @see DESCore*/
/** encrypt the string to string made up of hex* return the encrypted string*/ function strEnc(data, firstKey, secondKey, thirdKey) {
    var leng = data.length;
    var encData = "";
    var firstKeyBt,
    secondKeyBt,
    thirdKeyBt,
    firstLength,
    secondLength,
    thirdLength;
    if (firstKey != null && firstKey != "") {
        firstKeyBt = getKeyBytes(firstKey);
        firstLength = firstKeyBt.length;
    }
    if (secondKey != null && secondKey != "") {
        secondKeyBt = getKeyBytes(secondKey);
        secondLength = secondKeyBt.length;
    }
    if (thirdKey != null && thirdKey != "") {
        thirdKeyBt = getKeyBytes(thirdKey);
        thirdLength = thirdKeyBt.length;
    }
    if (leng > 0) {
        if (leng < 4) {
            var bt = strToBt(data);
            var encByte;
            if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
                var tempBt;
                var x,
                y,
                z;
                tempBt = bt;
                for (x = 0; x < firstLength; x++) {
                    tempBt = enc(tempBt, firstKeyBt[x]);
                }
                for (y = 0; y < secondLength; y++) {
                    tempBt = enc(tempBt, secondKeyBt[y]);
                }
                for (z = 0; z < thirdLength; z++) {
                    tempBt = enc(tempBt, thirdKeyBt[z]);
                }
                encByte = tempBt;
            } else {
                if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
                    var tempBt;
                    var x,
                    y;
                    tempBt = bt;
                    for (x = 0; x < firstLength; x++) {
                        tempBt = enc(tempBt, firstKeyBt[x]);
                    }
                    for (y = 0; y < secondLength; y++) {
                        tempBt = enc(tempBt, secondKeyBt[y]);
                    }
                    encByte = tempBt;
                } else {
                    if (firstKey != null && firstKey != "") {
                        var tempBt;
                        var x = 0;
                        tempBt = bt;
                        for (x = 0; x < firstLength; x++) {
                            tempBt = enc(tempBt, firstKeyBt[x]);
                        }
                        encByte = tempBt;
                    }
                }
            }
            encData = bt64ToHex(encByte);
        } else {
            var iterator = parseInt(leng / 4);
            var remainder = leng % 4;
            var i = 0;
            for (i = 0; i < iterator; i++) {
                var tempData = data.substring(i * 4 + 0, i * 4 + 4);
                var tempByte = strToBt(tempData);
                var encByte;
                if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
                    var tempBt;
                    var x,
                    y,
                    z;
                    tempBt = tempByte;
                    for (x = 0; x < firstLength; x++) {
                        tempBt = enc(tempBt, firstKeyBt[x]);
                    }
                    for (y = 0; y < secondLength; y++) {
                        tempBt = enc(tempBt, secondKeyBt[y]);
                    }
                    for (z = 0; z < thirdLength; z++) {
                        tempBt = enc(tempBt, thirdKeyBt[z]);
                    }
                    encByte = tempBt;
                } else {
                    if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
                        var tempBt;
                        var x,
                        y;
                        tempBt = tempByte;
                        for (x = 0; x < firstLength; x++) {
                            tempBt = enc(tempBt, firstKeyBt[x]);
                        }
                        for (y = 0; y < secondLength; y++) {
                            tempBt = enc(tempBt, secondKeyBt[y]);
                        }
                        encByte = tempBt;
                    } else {
                        if (firstKey != null && firstKey != "") {
                            var tempBt;
                            var x;
                            tempBt = tempByte;
                            for (x = 0; x < firstLength; x++) {
                                tempBt = enc(tempBt, firstKeyBt[x]);
                            }
                            encByte = tempBt;
                        }
                    }
                }
                encData += bt64ToHex(encByte);
            }
            if (remainder > 0) {
                var remainderData = data.substring(iterator * 4 + 0, leng);
                var tempByte = strToBt(remainderData);
                var encByte;
                if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
                    var tempBt;
                    var x,
                    y,
                    z;
                    tempBt = tempByte;
                    for (x = 0; x < firstLength; x++) {
                        tempBt = enc(tempBt, firstKeyBt[x]);
                    }
                    for (y = 0; y < secondLength; y++) {
                        tempBt = enc(tempBt, secondKeyBt[y]);
                    }
                    for (z = 0; z < thirdLength; z++) {
                        tempBt = enc(tempBt, thirdKeyBt[z]);
                    }
                    encByte = tempBt;
                } else {
                    if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
                        var tempBt;
                        var x,
                        y;
                        tempBt = tempByte;
                        for (x = 0; x < firstLength; x++) {
                            tempBt = enc(tempBt, firstKeyBt[x]);
                        }
                        for (y = 0; y < secondLength; y++) {
                            tempBt = enc(tempBt, secondKeyBt[y]);
                        }
                        encByte = tempBt;
                    } else {
                        if (firstKey != null && firstKey != "") {
                            var tempBt;
                            var x;
                            tempBt = tempByte;
                            for (x = 0; x < firstLength; x++) {
                                tempBt = enc(tempBt, firstKeyBt[x]);
                            }
                            encByte = tempBt;
                        }
                    }
                }
                encData += bt64ToHex(encByte);
            }
        }
    }
    return encData;
} /** decrypt the encrypted string to the original string ** return  the original string  */ function strDec(data, firstKey, secondKey, thirdKey) {
    var leng = data.length;
    var decStr = "";
    var firstKeyBt,
    secondKeyBt,
    thirdKeyBt,
    firstLength,
    secondLength,
    thirdLength;
    if (firstKey != null && firstKey != "") {
        firstKeyBt = getKeyBytes(firstKey);
        firstLength = firstKeyBt.length;
    }
    if (secondKey != null && secondKey != "") {
        secondKeyBt = getKeyBytes(secondKey);
        secondLength = secondKeyBt.length;
    }
    if (thirdKey != null && thirdKey != "") {
        thirdKeyBt = getKeyBytes(thirdKey);
        thirdLength = thirdKeyBt.length;
    }
    var iterator = parseInt(leng / 16);
    var i = 0;
    for (i = 0; i < iterator; i++) {
        var tempData = data.substring(i * 16 + 0, i * 16 + 16);
        var strByte = hexToBt64(tempData);
        var intByte = new Array(64);
        var j = 0;
        for (j = 0; j < 64; j++) {
            intByte[j] = parseInt(strByte.substring(j, j + 1));
        }
        var decByte;
        if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
            var tempBt;
            var x,
            y,
            z;
            tempBt = intByte;
            for (x = thirdLength - 1; x >= 0; x--) {
                tempBt = dec(tempBt, thirdKeyBt[x]);
            }
            for (y = secondLength - 1; y >= 0; y--) {
                tempBt = dec(tempBt, secondKeyBt[y]);
            }
            for (z = firstLength - 1; z >= 0; z--) {
                tempBt = dec(tempBt, firstKeyBt[z]);
            }
            decByte = tempBt;
        } else {
            if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
                var tempBt;
                var x,
                y,
                z;
                tempBt = intByte;
                for (x = secondLength - 1; x >= 0; x--) {
                    tempBt = dec(tempBt, secondKeyBt[x]);
                }
                for (y = firstLength - 1; y >= 0; y--) {
                    tempBt = dec(tempBt, firstKeyBt[y]);
                }
                decByte = tempBt;
            } else {
                if (firstKey != null && firstKey != "") {
                    var tempBt;
                    var x,
                    y,
                    z;
                    tempBt = intByte;
                    for (x = firstLength - 1; x >= 0; x--) {
                        tempBt = dec(tempBt, firstKeyBt[x]);
                    }
                    decByte = tempBt;
                }
            }
        }
        decStr += byteToString(decByte);
    }
    return decStr;
} /** chang the string into the bit array* * return bit array(it's length % 64 = 0)*/ function getKeyBytes(key) {
    var keyBytes = new Array();
    var leng = key.length;
    var iterator = parseInt(leng / 4);
    var remainder = leng % 4;
    var i = 0;
    for (i = 0; i < iterator; i++) {
        keyBytes[i] = strToBt(key.substring(i * 4 + 0, i * 4 + 4));
    }
    if (remainder > 0) {
        keyBytes[i] = strToBt(key.substring(i * 4 + 0, leng));
    }
    return keyBytes;
} /** chang the string(it's length <= 4) into the bit array* * return bit array(it's length = 64)*/ function strToBt(str) {
    var leng = str.length;
    var bt = new Array(64);
    if (leng < 4) {
        var i = 0,
        j = 0,
        p = 0,
        q = 0;
        for (i = 0; i < leng; i++) {
            var k = str.charCodeAt(i);
            for (j = 0; j < 16; j++) {
                var pow = 1,
                m = 0;
                for (m = 15; m > j; m--) {
                    pow *= 2;
                }
                bt[16 * i + j] = parseInt(k / pow) % 2;
            }
        }
        for (p = leng; p < 4; p++) {
            var k = 0;
            for (q = 0; q < 16; q++) {
                var pow = 1,
                m = 0;
                for (m = 15; m > q; m--) {
                    pow *= 2;
                }
                bt[16 * p + q] = parseInt(k / pow) % 2;
            }
        }
    } else {
        for (i = 0; i < 4; i++) {
            var k = str.charCodeAt(i);
            for (j = 0; j < 16; j++) {
                var pow = 1;
                for (m = 15; m > j; m--) {
                    pow *= 2;
                }
                bt[16 * i + j] = parseInt(k / pow) % 2;
            }
        }
    }
    return bt;
} /** chang the bit(it's length = 4) into the hex* * return hex*/ function bt4ToHex(binary) {
    var hex;
    switch (binary) {
    case "0000":
        hex = "0";
        break;
    case "0001":
        hex = "1";
        break;
    case "0010":
        hex = "2";
        break;
    case "0011":
        hex = "3";
        break;
    case "0100":
        hex = "4";
        break;
    case "0101":
        hex = "5";
        break;
    case "0110":
        hex = "6";
        break;
    case "0111":
        hex = "7";
        break;
    case "1000":
        hex = "8";
        break;
    case "1001":
        hex = "9";
        break;
    case "1010":
        hex = "A";
        break;
    case "1011":
        hex = "B";
        break;
    case "1100":
        hex = "C";
        break;
    case "1101":
        hex = "D";
        break;
    case "1110":
        hex = "E";
        break;
    case "1111":
        hex = "F";
        break;
    }
    return hex;
} /** chang the hex into the bit(it's length = 4)* * return the bit(it's length = 4)*/ function hexToBt4(hex) {
    var binary;
    switch (hex) {
    case "0":
        binary = "0000";
        break;
    case "1":
        binary = "0001";
        break;
    case "2":
        binary = "0010";
        break;
    case "3":
        binary = "0011";
        break;
    case "4":
        binary = "0100";
        break;
    case "5":
        binary = "0101";
        break;
    case "6":
        binary = "0110";
        break;
    case "7":
        binary = "0111";
        break;
    case "8":
        binary = "1000";
        break;
    case "9":
        binary = "1001";
        break;
    case "A":
        binary = "1010";
        break;
    case "B":
        binary = "1011";
        break;
    case "C":
        binary = "1100";
        break;
    case "D":
        binary = "1101";
        break;
    case "E":
        binary = "1110";
        break;
    case "F":
        binary = "1111";
        break;
    }
    return binary;
} /** chang the bit(it's length = 64) into the string* * return string*/ function byteToString(byteData) {
    var str = "";
    for (i = 0; i < 4; i++) {
        var count = 0;
        for (j = 0; j < 16; j++) {
            var pow = 1;
            for (m = 15; m > j; m--) {
                pow *= 2;
            }
            count += byteData[16 * i + j] * pow;
        }
        if (count != 0) {
            str += String.fromCharCode(count);
        }
    }
    return str;
}
function bt64ToHex(byteData) {
    var hex = "";
    for (i = 0; i < 16; i++) {
        var bt = "";
        for (j = 0; j < 4; j++) {
            bt += byteData[i * 4 + j];
        }
        hex += bt4ToHex(bt);
    }
    return hex;
}
function hexToBt64(hex) {
    var binary = "";
    for (i = 0; i < 16; i++) {
        binary += hexToBt4(hex.substring(i, i + 1));
    }
    return binary;
} /** the 64 bit des core arithmetic*/ function enc(dataByte, keyByte) {
    var keys = generateKeys(keyByte);
    var ipByte = initPermute(dataByte);
    var ipLeft = new Array(32);
    var ipRight = new Array(32);
    var tempLeft = new Array(32);
    var i = 0,
    j = 0,
    k = 0,
    m = 0,
    n = 0;
    for (k = 0; k < 32; k++) {
        ipLeft[k] = ipByte[k];
        ipRight[k] = ipByte[32 + k];
    }
    for (i = 0; i < 16; i++) {
        for (j = 0; j < 32; j++) {
            tempLeft[j] = ipLeft[j];
            ipLeft[j] = ipRight[j];
        }
        var key = new Array(48);
        for (m = 0; m < 48; m++) {
            key[m] = keys[i][m];
        }
        var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft);
        for (n = 0; n < 32; n++) {
            ipRight[n] = tempRight[n];
        }
    }
    var finalData = new Array(64);
    for (i = 0; i < 32; i++) {
        finalData[i] = ipRight[i];
        finalData[32 + i] = ipLeft[i];
    }
    return finallyPermute(finalData);
}
function dec(dataByte, keyByte) {
    var keys = generateKeys(keyByte);
    var ipByte = initPermute(dataByte);
    var ipLeft = new Array(32);
    var ipRight = new Array(32);
    var tempLeft = new Array(32);
    var i = 0,
    j = 0,
    k = 0,
    m = 0,
    n = 0;
    for (k = 0; k < 32; k++) {
        ipLeft[k] = ipByte[k];
        ipRight[k] = ipByte[32 + k];
    }
    for (i = 15; i >= 0; i--) {
        for (j = 0; j < 32; j++) {
            tempLeft[j] = ipLeft[j];
            ipLeft[j] = ipRight[j];
        }
        var key = new Array(48);
        for (m = 0; m < 48; m++) {
            key[m] = keys[i][m];
        }
        var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft);
        for (n = 0; n < 32; n++) {
            ipRight[n] = tempRight[n];
        }
    }
    var finalData = new Array(64);
    for (i = 0; i < 32; i++) {
        finalData[i] = ipRight[i];
        finalData[32 + i] = ipLeft[i];
    }
    return finallyPermute(finalData);
}
function initPermute(originalData) {
    var ipByte = new Array(64);
    for (i = 0, m = 1, n = 0; i < 4; i++, m += 2, n += 2) {
        for (j = 7, k = 0; j >= 0; j--, k++) {
            ipByte[i * 8 + k] = originalData[j * 8 + m];
            ipByte[i * 8 + k + 32] = originalData[j * 8 + n];
        }
    }
    return ipByte;
}
function expandPermute(rightData) {
    var epByte = new Array(48);
    for (i = 0; i < 8; i++) {
        if (i == 0) {
            epByte[i * 6 + 0] = rightData[31];
        } else {
            epByte[i * 6 + 0] = rightData[i * 4 - 1];
        }
        epByte[i * 6 + 1] = rightData[i * 4 + 0];
        epByte[i * 6 + 2] = rightData[i * 4 + 1];
        epByte[i * 6 + 3] = rightData[i * 4 + 2];
        epByte[i * 6 + 4] = rightData[i * 4 + 3];
        if (i == 7) {
            epByte[i * 6 + 5] = rightData[0];
        } else {
            epByte[i * 6 + 5] = rightData[i * 4 + 4];
        }
    }
    return epByte;
}
function xor(byteOne, byteTwo) {
    var xorByte = new Array(byteOne.length);
    for (i = 0; i < byteOne.length; i++) {
        xorByte[i] = byteOne[i] ^ byteTwo[i];
    }
    return xorByte;
}
function sBoxPermute(expandByte) {
    var sBoxByte = new Array(32);
    var binary = "";
    var s1 = [[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7], [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8], [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0], [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]]; /* Table - s2 */ var s2 = [[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10], [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5], [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15], [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]]; /* Table - s3 */ var s3 = [[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8], [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1], [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7], [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]]; /* Table - s4 */ var s4 = [[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15], [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9], [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4], [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]]; /* Table - s5 */ var s5 = [[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9], [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6], [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14], [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]]; /* Table - s6 */ var s6 = [[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11], [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8], [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6], [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]]; /* Table - s7 */ var s7 = [[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1], [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6], [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2], [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]]; /* Table - s8 */ var s8 = [[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7], [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2], [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8], [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]];
    for (m = 0; m < 8; m++) {
        var i = 0,
        j = 0;
        i = expandByte[m * 6 + 0] * 2 + expandByte[m * 6 + 5];
        j = expandByte[m * 6 + 1] * 2 * 2 * 2 + expandByte[m * 6 + 2] * 2 * 2 + expandByte[m * 6 + 3] * 2 + expandByte[m * 6 + 4];
        switch (m) {
        case 0:
            binary = getBoxBinary(s1[i][j]);
            break;
        case 1:
            binary = getBoxBinary(s2[i][j]);
            break;
        case 2:
            binary = getBoxBinary(s3[i][j]);
            break;
        case 3:
            binary = getBoxBinary(s4[i][j]);
            break;
        case 4:
            binary = getBoxBinary(s5[i][j]);
            break;
        case 5:
            binary = getBoxBinary(s6[i][j]);
            break;
        case 6:
            binary = getBoxBinary(s7[i][j]);
            break;
        case 7:
            binary = getBoxBinary(s8[i][j]);
            break;
        }
        sBoxByte[m * 4 + 0] = parseInt(binary.substring(0, 1));
        sBoxByte[m * 4 + 1] = parseInt(binary.substring(1, 2));
        sBoxByte[m * 4 + 2] = parseInt(binary.substring(2, 3));
        sBoxByte[m * 4 + 3] = parseInt(binary.substring(3, 4));
    }
    return sBoxByte;
}
function pPermute(sBoxByte) {
    var pBoxPermute = new Array(32);
    pBoxPermute[0] = sBoxByte[15];
    pBoxPermute[1] = sBoxByte[6];
    pBoxPermute[2] = sBoxByte[19];
    pBoxPermute[3] = sBoxByte[20];
    pBoxPermute[4] = sBoxByte[28];
    pBoxPermute[5] = sBoxByte[11];
    pBoxPermute[6] = sBoxByte[27];
    pBoxPermute[7] = sBoxByte[16];
    pBoxPermute[8] = sBoxByte[0];
    pBoxPermute[9] = sBoxByte[14];
    pBoxPermute[10] = sBoxByte[22];
    pBoxPermute[11] = sBoxByte[25];
    pBoxPermute[12] = sBoxByte[4];
    pBoxPermute[13] = sBoxByte[17];
    pBoxPermute[14] = sBoxByte[30];
    pBoxPermute[15] = sBoxByte[9];
    pBoxPermute[16] = sBoxByte[1];
    pBoxPermute[17] = sBoxByte[7];
    pBoxPermute[18] = sBoxByte[23];
    pBoxPermute[19] = sBoxByte[13];
    pBoxPermute[20] = sBoxByte[31];
    pBoxPermute[21] = sBoxByte[26];
    pBoxPermute[22] = sBoxByte[2];
    pBoxPermute[23] = sBoxByte[8];
    pBoxPermute[24] = sBoxByte[18];
    pBoxPermute[25] = sBoxByte[12];
    pBoxPermute[26] = sBoxByte[29];
    pBoxPermute[27] = sBoxByte[5];
    pBoxPermute[28] = sBoxByte[21];
    pBoxPermute[29] = sBoxByte[10];
    pBoxPermute[30] = sBoxByte[3];
    pBoxPermute[31] = sBoxByte[24];
    return pBoxPermute;
}
function finallyPermute(endByte) {
    var fpByte = new Array(64);
    fpByte[0] = endByte[39];
    fpByte[1] = endByte[7];
    fpByte[2] = endByte[47];
    fpByte[3] = endByte[15];
    fpByte[4] = endByte[55];
    fpByte[5] = endByte[23];
    fpByte[6] = endByte[63];
    fpByte[7] = endByte[31];
    fpByte[8] = endByte[38];
    fpByte[9] = endByte[6];
    fpByte[10] = endByte[46];
    fpByte[11] = endByte[14];
    fpByte[12] = endByte[54];
    fpByte[13] = endByte[22];
    fpByte[14] = endByte[62];
    fpByte[15] = endByte[30];
    fpByte[16] = endByte[37];
    fpByte[17] = endByte[5];
    fpByte[18] = endByte[45];
    fpByte[19] = endByte[13];
    fpByte[20] = endByte[53];
    fpByte[21] = endByte[21];
    fpByte[22] = endByte[61];
    fpByte[23] = endByte[29];
    fpByte[24] = endByte[36];
    fpByte[25] = endByte[4];
    fpByte[26] = endByte[44];
    fpByte[27] = endByte[12];
    fpByte[28] = endByte[52];
    fpByte[29] = endByte[20];
    fpByte[30] = endByte[60];
    fpByte[31] = endByte[28];
    fpByte[32] = endByte[35];
    fpByte[33] = endByte[3];
    fpByte[34] = endByte[43];
    fpByte[35] = endByte[11];
    fpByte[36] = endByte[51];
    fpByte[37] = endByte[19];
    fpByte[38] = endByte[59];
    fpByte[39] = endByte[27];
    fpByte[40] = endByte[34];
    fpByte[41] = endByte[2];
    fpByte[42] = endByte[42];
    fpByte[43] = endByte[10];
    fpByte[44] = endByte[50];
    fpByte[45] = endByte[18];
    fpByte[46] = endByte[58];
    fpByte[47] = endByte[26];
    fpByte[48] = endByte[33];
    fpByte[49] = endByte[1];
    fpByte[50] = endByte[41];
    fpByte[51] = endByte[9];
    fpByte[52] = endByte[49];
    fpByte[53] = endByte[17];
    fpByte[54] = endByte[57];
    fpByte[55] = endByte[25];
    fpByte[56] = endByte[32];
    fpByte[57] = endByte[0];
    fpByte[58] = endByte[40];
    fpByte[59] = endByte[8];
    fpByte[60] = endByte[48];
    fpByte[61] = endByte[16];
    fpByte[62] = endByte[56];
    fpByte[63] = endByte[24];
    return fpByte;
}
function getBoxBinary(i) {
    var binary = "";
    switch (i) {
    case 0:
        binary = "0000";
        break;
    case 1:
        binary = "0001";
        break;
    case 2:
        binary = "0010";
        break;
    case 3:
        binary = "0011";
        break;
    case 4:
        binary = "0100";
        break;
    case 5:
        binary = "0101";
        break;
    case 6:
        binary = "0110";
        break;
    case 7:
        binary = "0111";
        break;
    case 8:
        binary = "1000";
        break;
    case 9:
        binary = "1001";
        break;
    case 10:
        binary = "1010";
        break;
    case 11:
        binary = "1011";
        break;
    case 12:
        binary = "1100";
        break;
    case 13:
        binary = "1101";
        break;
    case 14:
        binary = "1110";
        break;
    case 15:
        binary = "1111";
        break;
    }
    return binary;
} /** generate 16 keys for xor**/ function generateKeys(keyByte) {
    var key = new Array(56);
    var keys = new Array();
    keys[0] = new Array();
    keys[1] = new Array();
    keys[2] = new Array();
    keys[3] = new Array();
    keys[4] = new Array();
    keys[5] = new Array();
    keys[6] = new Array();
    keys[7] = new Array();
    keys[8] = new Array();
    keys[9] = new Array();
    keys[10] = new Array();
    keys[11] = new Array();
    keys[12] = new Array();
    keys[13] = new Array();
    keys[14] = new Array();
    keys[15] = new Array();
    var loop = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1];
    for (i = 0; i < 7; i++) {
        for (j = 0, k = 7; j < 8; j++, k--) {
            key[i * 8 + j] = keyByte[8 * k + i];
        }
    }
    var i = 0;
    for (i = 0; i < 16; i++) {
        var tempLeft = 0;
        var tempRight = 0;
        for (j = 0; j < loop[i]; j++) {
            tempLeft = key[0];
            tempRight = key[28];
            for (k = 0; k < 27; k++) {
                key[k] = key[k + 1];
                key[28 + k] = key[29 + k];
            }
            key[27] = tempLeft;
            key[55] = tempRight;
        }
        var tempKey = new Array(48);
        tempKey[0] = key[13];
        tempKey[1] = key[16];
        tempKey[2] = key[10];
        tempKey[3] = key[23];
        tempKey[4] = key[0];
        tempKey[5] = key[4];
        tempKey[6] = key[2];
        tempKey[7] = key[27];
        tempKey[8] = key[14];
        tempKey[9] = key[5];
        tempKey[10] = key[20];
        tempKey[11] = key[9];
        tempKey[12] = key[22];
        tempKey[13] = key[18];
        tempKey[14] = key[11];
        tempKey[15] = key[3];
        tempKey[16] = key[25];
        tempKey[17] = key[7];
        tempKey[18] = key[15];
        tempKey[19] = key[6];
        tempKey[20] = key[26];
        tempKey[21] = key[19];
        tempKey[22] = key[12];
        tempKey[23] = key[1];
        tempKey[24] = key[40];
        tempKey[25] = key[51];
        tempKey[26] = key[30];
        tempKey[27] = key[36];
        tempKey[28] = key[46];
        tempKey[29] = key[54];
        tempKey[30] = key[29];
        tempKey[31] = key[39];
        tempKey[32] = key[50];
        tempKey[33] = key[44];
        tempKey[34] = key[32];
        tempKey[35] = key[47];
        tempKey[36] = key[43];
        tempKey[37] = key[48];
        tempKey[38] = key[38];
        tempKey[39] = key[55];
        tempKey[40] = key[33];
        tempKey[41] = key[52];
        tempKey[42] = key[45];
        tempKey[43] = key[41];
        tempKey[44] = key[49];
        tempKey[45] = key[35];
        tempKey[46] = key[28];
        tempKey[47] = key[31];
        switch (i) {
        case 0:
            for (m = 0; m < 48; m++) {
                keys[0][m] = tempKey[m];
            }
            break;
        case 1:
            for (m = 0; m < 48; m++) {
                keys[1][m] = tempKey[m];
            }
            break;
        case 2:
            for (m = 0; m < 48; m++) {
                keys[2][m] = tempKey[m];
            }
            break;
        case 3:
            for (m = 0; m < 48; m++) {
                keys[3][m] = tempKey[m];
            }
            break;
        case 4:
            for (m = 0; m < 48; m++) {
                keys[4][m] = tempKey[m];
            }
            break;
        case 5:
            for (m = 0; m < 48; m++) {
                keys[5][m] = tempKey[m];
            }
            break;
        case 6:
            for (m = 0; m < 48; m++) {
                keys[6][m] = tempKey[m];
            }
            break;
        case 7:
            for (m = 0; m < 48; m++) {
                keys[7][m] = tempKey[m];
            }
            break;
        case 8:
            for (m = 0; m < 48; m++) {
                keys[8][m] = tempKey[m];
            }
            break;
        case 9:
            for (m = 0; m < 48; m++) {
                keys[9][m] = tempKey[m];
            }
            break;
        case 10:
            for (m = 0; m < 48; m++) {
                keys[10][m] = tempKey[m];
            }
            break;
        case 11:
            for (m = 0; m < 48; m++) {
                keys[11][m] = tempKey[m];
            }
            break;
        case 12:
            for (m = 0; m < 48; m++) {
                keys[12][m] = tempKey[m];
            }
            break;
        case 13:
            for (m = 0; m < 48; m++) {
                keys[13][m] = tempKey[m];
            }
            break;
        case 14:
            for (m = 0; m < 48; m++) {
                keys[14][m] = tempKey[m];
            }
            break;
        case 15:
            for (m = 0; m < 48; m++) {
                keys[15][m] = tempKey[m];
            }
            break;
        }
    }
    return keys;
} //end-------------------------------------------------------------------------------------------------------------/*从后台请求加密密码字符串*/function findDes(){	var jsonStr;	$.ajax({		//以那一种方法向服务器请求数据		type:"POST",		//向那个资源发送请求		url:"${ctx}/Login!findDesKey.do",		//处理什么类型的数据		dataType:"html",		async:false,		//根据返回数据进行什么处理		success:function(returnedData){			//判断是否禁止撤单			if(returnedData!=null || returnedData !=""){				jsonStr = eval('(' + returnedData + ')'); 			}else{				alert('des返回失败!请检查控件是否被禁用。'+jsonStr);			}   							}	});	return jsonStr;}

重要是解密函数，很多js中只携带了strEnc()，对于解密来说有些麻烦，解密函数 ：

function strDec(data, firstKey, secondKey, thirdKey) {
    var leng = data.length;
    var decStr = "";
    var firstKeyBt,
    secondKeyBt,
    thirdKeyBt,
    firstLength,
    secondLength,
    thirdLength;
    if (firstKey != null && firstKey != "") {
        firstKeyBt = getKeyBytes(firstKey);
        firstLength = firstKeyBt.length;
    }
    if (secondKey != null && secondKey != "") {
        secondKeyBt = getKeyBytes(secondKey);
        secondLength = secondKeyBt.length;
    }
    if (thirdKey != null && thirdKey != "") {
        thirdKeyBt = getKeyBytes(thirdKey);
        thirdLength = thirdKeyBt.length;
    }
    var iterator = parseInt(leng / 16);
    var i = 0;
    for (i = 0; i < iterator; i++) {
        var tempData = data.substring(i * 16 + 0, i * 16 + 16);
        var strByte = hexToBt64(tempData);
        var intByte = new Array(64);
        var j = 0;
        for (j = 0; j < 64; j++) {
            intByte[j] = parseInt(strByte.substring(j, j + 1));
        }
        var decByte;
        if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
            var tempBt;
            var x,
            y,
            z;
            tempBt = intByte;
            for (x = thirdLength - 1; x >= 0; x--) {
                tempBt = dec(tempBt, thirdKeyBt[x]);
            }
            for (y = secondLength - 1; y >= 0; y--) {
                tempBt = dec(tempBt, secondKeyBt[y]);
            }
            for (z = firstLength - 1; z >= 0; z--) {
                tempBt = dec(tempBt, firstKeyBt[z]);
            }
            decByte = tempBt;
        } else {
            if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
                var tempBt;
                var x,
                y,
                z;
                tempBt = intByte;
                for (x = secondLength - 1; x >= 0; x--) {
                    tempBt = dec(tempBt, secondKeyBt[x]);
                }
                for (y = firstLength - 1; y >= 0; y--) {
                    tempBt = dec(tempBt, firstKeyBt[y]);
                }
                decByte = tempBt;
            } else {
                if (firstKey != null && firstKey != "") {
                    var tempBt;
                    var x,
                    y,
                    z;
                    tempBt = intByte;
                    for (x = firstLength - 1; x >= 0; x--) {
                        tempBt = dec(tempBt, firstKeyBt[x]);
                    }
                    decByte = tempBt;
                }
            }
        }
		decStr += byteToString(decByte);
		//console.log(decStr);
    }
    return decStr;
}