function strMd5CtxParams() {
    this.md5count;
    this.state;
    this.buffer;
};

function md5_init() {
    var md5CtxParams = new strMd5CtxParams();

    md5CtxParams.md5count = new Array(2);
    md5CtxParams.state = new Array(4);
    md5CtxParams.buffer = new Uint8Array(64);

    md5CtxParams.md5count[0] = 0;
    md5CtxParams.md5count[1] = 0;
    md5CtxParams.state[0] = 0x67452301;
    md5CtxParams.state[1] = 0xEFCDAB89;
    md5CtxParams.state[2] = 0x98BADCFE;
    md5CtxParams.state[3] = 0x10325476;

    return md5CtxParams;
}

function md5_update(md5CtxParams, data, datalen) {
    //unsigned int i = 0;
    //unsigned int index = 0;
    //unsigned int partlen = 0;
    var index = 0;
    var i = 0;
    var j = 0;
    var partlen = 0;

    //index = (m_Md5Count[0] >> 3) & 0x3F;
    index = (md5CtxParams.md5count[0] >>> 3) & 0x3F;

    partlen = 64 - index;
    //m_Md5Count[0] += (inputlen << 3);
    md5CtxParams.md5count[0] = bn_u32_add(md5CtxParams.md5count[0], datalen << 3);
    //if(m_Md5Count[0] < (inputlen << 3)) {
    if (bn_u32_compare(md5CtxParams.md5count[0], datalen << 3) < 0) {
        //m_Md5Count[1]++;
        md5CtxParams.md5count[1] = bn_u32_add(md5CtxParams.md5count[1], 1);
    }
    //m_Md5Count[1] += (inputlen >> 29);
    md5CtxParams.md5count[1] = bn_u32_add(md5CtxParams.md5count[1], datalen >>> 29);

    if (datalen >= partlen) {
        //memcpy(&m_Buffer[index],input,partlen);
        for (j = 0; j < partlen; j++) {
            md5CtxParams.buffer[index + j] = data[j];
        }
        //Transform(m_State,m_Buffer);
        Transform(md5CtxParams.state, md5CtxParams.buffer, 0);
        for (i = partlen; i + 64 <= datalen; i += 64) {
            //Transform(m_State, (unsigned char*)&input[i]);
            Transform(md5CtxParams.state, data, i);
        }
        index = 0;
    } else {
        i = 0;
        //console.log("iii");
    }
    //memcpy(&m_Buffer[index],&input[i],inputlen-i);
    for (j = 0; j < datalen - i; j++) {
        md5CtxParams.buffer[index + j] = data[i + j];
    }
}

function md5_final(md5CtxParams) {
    var PADDING = [0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    var index = 0, padlen = 0;
    var result = new Uint8Array(16);
    var bits = new Uint8Array(8);
    var i = 0;

    //index = (m_Md5Count[0] >> 3) & 0x3F;
    index = (md5CtxParams.md5count[0] >> 3) & 0x3F;
    padlen = (index < 56) ? (56 - index) : (120 - index);
    Encode(bits, md5CtxParams.md5count, 0, 8);
    md5_update(md5CtxParams, PADDING, padlen);
    md5_update(md5CtxParams, bits, 8);

    //console.log("md5_final = %d %d %d %d", md5CtxParams.state[0], md5CtxParams.state[1], md5CtxParams.state[2], md5CtxParams.state[3]);
    Encode(result, md5CtxParams.state, 0, 16);

    return result;
}

function md5_str_to_array(strIn) {
    var bytesArray = new Uint8Array(strIn.length);
    var i = 0;

    for (i = 0; i < strIn.length; i++) {
        bytesArray[i] = strIn.charCodeAt(i);
    }

    return bytesArray;
}


function md5_hex_to_array(hexStrIn) {
    var i = 0;
    var cnt = 0;
    var ele = 0;
    var bytesArray = null;

    cnt = 0;
    for (i = 0; i < hexStrIn.length; i++) {
        ele = hexStrIn.charCodeAt(i);
        if (ele >= 48 && ele < 48 + 10) {
            cnt++;
        }
        if (ele >= 65 && ele < 65 + 6) {
            cnt++;
        }
        if (ele >= 97 && ele < 97 + 6) {
            cnt++;
        }
    }
    bytesArray = new Uint8Array(parseInt((cnt + 1) / 2));
    cnt = 0;
    for (i = 0; i < hexStrIn.length; i++) {
        ele = hexStrIn.charCodeAt(i);
        if (ele >= 48 && ele < 48 + 10) {
            ele -= 48;
            cnt++;
        } else if (ele >= 65 && ele < 65 + 6) {
            ele = ele - 65 + 10;
            cnt++;
        } else if (ele >= 97 && ele < 97 + 6) {
            ele = ele - 97 + 10;
            cnt++;
        } else {
            continue;
        }
        if ((cnt % 2) == 1) {
            bytesArray[parseInt((cnt - 1) / 2)] = (ele << 4) & 0xF0;
        } else {
            bytesArray[parseInt((cnt - 1) / 2)] |= ele;
        }
    }

    return bytesArray;
}

function md5_encode_hex(result, len) {
    var sha256_hex_digits = "0123456789abcdef";
    var output = new String();
    var i = 0;

    for (i = 0; i < len; i++) {
        output += sha256_hex_digits.charAt((result[i] >>> 4) & 0x0f);
        output += sha256_hex_digits.charAt((result[i]) & 0x0f);
    }

    return output;
}

function F(x, y, z) {
    return ((x & y) | (~x & z));
}

function G(x, y, z) {
    return ((x & z) | (y & ~z));
}

function H(x, y, z) {
    return (x ^ y ^ z);
}

function I(x, y, z) {
    return (y ^ (x | ~z));
}

function ROTATE_LEFT(x, n) {
    x = x & 0xffffffff;
    return ((x << n) | (x >>> (32 - n)));
}

function FF(a, b, c, d, x, s, ac) {
    //a += F(b,c,d) + x + ac;
    a = bn_u32_add(a, F(b, c, d));
    a = bn_u32_add(a, x);
    a = bn_u32_add(a, ac);

    a = ROTATE_LEFT(a, s);
    //a += b;
    a = bn_u32_add(a, b);
    return a;
}

function GG(a, b, c, d, x, s, ac) {
    //a += G(b,c,d) + x + ac; 
    a = bn_u32_add(a, G(b, c, d));
    a = bn_u32_add(a, x);
    a = bn_u32_add(a, ac);
    a = ROTATE_LEFT(a, s);
    //a += b; 
    a = bn_u32_add(a, b);

    return a;
}

function HH(a, b, c, d, x, s, ac) {
    //a += H(b,c,d) + x + ac; 
    a = bn_u32_add(a, H(b, c, d));
    a = bn_u32_add(a, x);
    a = bn_u32_add(a, ac);

    a = ROTATE_LEFT(a, s);
    //a += b; 
    a = bn_u32_add(a, b);

    return a;
}

function II(a, b, c, d, x, s, ac) {
    //a += H(b,c,d) + x + ac; 
    a = bn_u32_add(a, I(b, c, d));
    a = bn_u32_add(a, x);
    a = bn_u32_add(a, ac);

    a = ROTATE_LEFT(a, s);
    //a += b; 
    a = bn_u32_add(a, b);

    return a;
}

function Transform(state, block, blockindex) {
    var x = new Array(64);//Uint8Array(64);
    var a = state[0];
    var b = state[1];
    var c = state[2];
    var d = state[3];
    //var i = 0;

    Decode(x, block, blockindex, 64);

    //printfIntsIndex("x", x, 0, 64);
    a = FF(a, b, c, d, x[0], 7, 0xd76aa478); /* 1 */
    d = FF(d, a, b, c, x[1], 12, 0xe8c7b756); /* 2 */
    c = FF(c, d, a, b, x[2], 17, 0x242070db); /* 3 */
    b = FF(b, c, d, a, x[3], 22, 0xc1bdceee); /* 4 */
    a = FF(a, b, c, d, x[4], 7, 0xf57c0faf); /* 5 */
    d = FF(d, a, b, c, x[5], 12, 0x4787c62a); /* 6 */
    c = FF(c, d, a, b, x[6], 17, 0xa8304613); /* 7 */
    b = FF(b, c, d, a, x[7], 22, 0xfd469501); /* 8 */
    a = FF(a, b, c, d, x[8], 7, 0x698098d8); /* 9 */
    d = FF(d, a, b, c, x[9], 12, 0x8b44f7af); /* 10 */
    c = FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
    b = FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
    a = FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */
    d = FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
    c = FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
    b = FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */
    //console.log("a = %d b = %d c = %d d = %d", a, b, c, d);
    //console.log("3a = %d b = %d c = %d d = %d", a, b, c, d);

    /* Round 2 */
    a = GG(a, b, c, d, x[1], 5, 0xf61e2562); /* 17 */
    //console.log("4a = %d b = %d c = %d d = %d", a, b, c, d);
    d = GG(d, a, b, c, x[6], 9, 0xc040b340); /* 18 */
    //console.log("5a = %d b = %d c = %d d = %d", a, b, c, d);
    c = GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
    //console.log("6a = %d b = %d c = %d d = %d", a, b, c, d);
    b = GG(b, c, d, a, x[0], 20, 0xe9b6c7aa); /* 20 */
    //console.log("7a = %d b = %d c = %d d = %d", a, b, c, d);
    a = GG(a, b, c, d, x[5], 5, 0xd62f105d); /* 21 */
    //console.log("8a = %d b = %d c = %d d = %d", a, b, c, d);
    d = GG(d, a, b, c, x[10], 9, 0x2441453); /* 22 */
    //console.log("9a = %d b = %d c = %d d = %d", a, b, c, d);
    c = GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
    //console.log("10a = %d b = %d c = %d d = %d", a, b, c, d);
    b = GG(b, c, d, a, x[4], 20, 0xe7d3fbc8); /* 24 */
    //console.log("11a = %d b = %d c = %d d = %d", a, b, c, d);
    a = GG(a, b, c, d, x[9], 5, 0x21e1cde6); /* 25 */
    //console.log("12a = %d b = %d c = %d d = %d", a, b, c, d);
    d = GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */
    //console.log("13a = %d b = %d c = %d d = %d", a, b, c, d);
    c = GG(c, d, a, b, x[3], 14, 0xf4d50d87); /* 27 */
    //console.log("14a = %d b = %d c = %d d = %d", a, b, c, d);
    b = GG(b, c, d, a, x[8], 20, 0x455a14ed); /* 28 */
    //console.log("15a = %d b = %d c = %d d = %d", a, b, c, d);
    a = GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */
    //console.log("16a = %d b = %d c = %d d = %d", a, b, c, d);
    d = GG(d, a, b, c, x[2], 9, 0xfcefa3f8); /* 30 */
    //console.log("17a = %d b = %d c = %d d = %d", a, b, c, d);
    c = GG(c, d, a, b, x[7], 14, 0x676f02d9); /* 31 */
    //console.log("18a = %d b = %d c = %d d = %d", a, b, c, d);
    b = GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */
    //console.log("2a = %d b = %d c = %d d = %d", a, b, c, d);

    /* Round 3 */
    a = HH(a, b, c, d, x[5], 4, 0xfffa3942); /* 33 */
    d = HH(d, a, b, c, x[8], 11, 0x8771f681); /* 34 */
    c = HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
    b = HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
    a = HH(a, b, c, d, x[1], 4, 0xa4beea44); /* 37 */
    d = HH(d, a, b, c, x[4], 11, 0x4bdecfa9); /* 38 */
    c = HH(c, d, a, b, x[7], 16, 0xf6bb4b60); /* 39 */
    b = HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
    a = HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */
    d = HH(d, a, b, c, x[0], 11, 0xeaa127fa); /* 42 */
    c = HH(c, d, a, b, x[3], 16, 0xd4ef3085); /* 43 */
    b = HH(b, c, d, a, x[6], 23, 0x4881d05); /* 44 */
    a = HH(a, b, c, d, x[9], 4, 0xd9d4d039); /* 45 */
    d = HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
    c = HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
    b = HH(b, c, d, a, x[2], 23, 0xc4ac5665); /* 48 */
    //console.log("1a = %d b = %d c = %d d = %d", a, b, c, d);

    /* Round 4 */
    a = II(a, b, c, d, x[0], 6, 0xf4292244); /* 49 */
    d = II(d, a, b, c, x[7], 10, 0x432aff97); /* 50 */
    c = II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
    b = II(b, c, d, a, x[5], 21, 0xfc93a039); /* 52 */
    a = II(a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */
    d = II(d, a, b, c, x[3], 10, 0x8f0ccc92); /* 54 */
    c = II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
    b = II(b, c, d, a, x[1], 21, 0x85845dd1); /* 56 */
    a = II(a, b, c, d, x[8], 6, 0x6fa87e4f); /* 57 */
    d = II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
    c = II(c, d, a, b, x[6], 15, 0xa3014314); /* 59 */
    b = II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
    a = II(a, b, c, d, x[4], 6, 0xf7537e82); /* 61 */
    d = II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
    c = II(c, d, a, b, x[2], 15, 0x2ad7d2bb); /* 63 */
    b = II(b, c, d, a, x[9], 21, 0xeb86d391); /* 64 */

    //console.log("0a = %d b = %d c = %d d = %d", a, b, c, d);
    //console.log("pre state = %d %d %d %d", state[0], state[1], state[2], state[3]);

    //state[0] += a;
    state[0] = bn_u32_add(state[0], a);
    //state[1] += b;
    state[1] = bn_u32_add(state[1], b);
    //state[2] += c;
    state[2] = bn_u32_add(state[2], c);
    //state[3] += d;
    state[3] = bn_u32_add(state[3], d);

    //throw Error("11");
    //console.log("state = %d %d %d %d", state[0], state[1], state[2], state[3]);
    //throw Error("11");
}

function Decode(output, input, inputindex, len) {
    var i = 0;
    var j = 0;

    while (j < len) {
        output[i] = ((input[j + inputindex]) & 0xff) |
            ((input[j + 1 + inputindex] & 0xff) << 8) |
            ((input[j + 2 + inputindex] & 0xff) << 16) |
            ((input[j + 3 + inputindex] & 0xff) << 24);
        i++;
        j += 4;
    }
}

function Encode(output, input, inputindex, len) {
    //unsigned int i = 0;
    //unsigned int j = 0;
    var i = 0;
    var j = 0;

    while (j < len) {
        output[j] = input[i + inputindex] & 0xFF;
        output[j + 1] = (input[i + inputindex] >>> 8) & 0xFF;
        output[j + 2] = (input[i + inputindex] >>> 16) & 0xFF;
        output[j + 3] = (input[i + inputindex] >>> 24) & 0xFF;
        i++;
        j += 4;
    }
}

/*
function printfInts(title, data, len) {
    printfIntsIndex(title, data, 0, len);
}

function printfIntsIndex(title, data, index, len) {
    var i = 0;
	
    for (i = 0; i < len; i++) {
        console.log("%d %s %d", i, title == null ? "":title, data[i + index]);
    }
}*/

function bn_u32_compare(uint1, uint2) {
    uint1 &= 0xffffffff;
    uint2 &= 0xffffffff;

    if ((uint1 & 0x80000000) == 0 && (uint2 & 0x80000000) == 0) {
        return uint1 > uint2 ? 1 : (uint1 == uint2 ? 0 : (-1));
    }
    if ((uint1 & 0x80000000) != 0 && (uint2 & 0x80000000) != 0) {
        uint1 &= 0x7fffffff;
        uint2 &= 0x7fffffff;
        return uint1 > uint2 ? 1 : (uint1 == uint2 ? 0 : (-1));
    }
    if ((uint1 & 0x80000000) != 0) {
        return 1;
    } else {
        return -1;
    }
}

function bn_u32_add(add1, add2) {
    var i = 0;
    var tmp = 0;
    var result = 0;

    //add1 &= 0xffffffff;
    //add2 &= 0xffffffff;

    for (i = 0; i < 4; i++) {
        tmp = ((add1 >>> (i * 8)) & 0xff) + ((add2 >>> (i * 8)) & 0xff) + tmp;
        result |= ((tmp & 0xff) << (i * 8));
        tmp = tmp >>> 8;
    }

    return result & 0xffffffff;
}
/*
function bn_u32_minus(minuend, subtractor) {
    var a = (minuend & 0xffffffff) >>> 0;
    var b = (subtractor & 0xffffffff) >>> 0;
	
    return (a - b) & 0xffffffff;
}
*/

module.exports = {
    md5_init: md5_init,
    md5_update: md5_update,
    md5_final: md5_final,
    md5_encode_hex: md5_encode_hex,
    md5_str_to_array: md5_str_to_array,
    md5_hex_to_array: md5_hex_to_array,
}

/*
var data1 = "Decrypt";
var data0 = "1234567890abcdef9999oplk8563plmh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
var data2 = "96325";
//char buf[128];

//EZERO_ARRAY(buf);
var md5ctx = null;
var result = null;

// 字符串 
md5ctx = md5_init();
md5_update(md5ctx, md5_str_to_array(data0), data0.length);
md5_update(md5ctx, md5_str_to_array(data1), data1.length);
md5_update(md5ctx, md5_str_to_array(data2), data2.length);
result = md5_final(md5ctx);
console.log("result:" + md5_encode_hex(result, 16));

// hex 
md5ctx = md5_init();
md5_update(md5ctx, md5_hex_to_array("001122334455"), 6);
md5_update(md5ctx, md5_hex_to_array("AABBCCDDEEFF"), 6);
md5_update(md5ctx, md5_hex_to_array("88"), 1);
result = md5_final(md5ctx);
console.log("result:" + md5_encode_hex(result, 16));
*/