Creating a SHA1 Hash

[mflassak]

Hi all,

short question for a beginner:

Is it possible to create a SHA1 hash from a string inside a thingworx service script? I will need it to be able to connect to a thing which sends a token and I have to add password as SHA1 string...

Thanks.

[ptc-5082906]

Hi Martin, I believe there are 2 ways to solve this problem, you can :

a ) Use AJAX to call your back-end page and retrieve the hash

b )  Use one of the Javascript libraries such as CryptoJS or http://www.movable-type.co.uk/scripts/sha1.html

Let me know if this helps.

-Horia.

[mflassak]

Hi Horia,

with help from PTC I was able to create a local JavaScript Service (variable "i) which does the work without adding additional libraries:

//  discuss at: http://phpjs.org/functions/sha1/
// original by: Webtoolkit.info (http://www.webtoolkit.info/)
// improved by: Michael White (http://getsprink.com)
// improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
//    input by: Brett Zamir (http://brett-zamir.me)
//  example 1: sha1('Kevin van Zonneveld');
//  returns 1: '54916d2e62f65b3afa6e192e6a601cdbe5cb5897'

function rotate_left(n,s) {
    var t4 = ( n<<s ) | (n>>>(32-s));
    return t4;
};

function lsb_hex(val) {
    var str="";
    var i;
    var vh;
    var vl;
    for( i=0; i<=6; i+=2 ) {
        vh = (val>>>(i*4+4))&0x0f;
        vl = (val>>>(i*4))&0x0f;
        str += vh.toString(16) + vl.toString(16);
    }
    return str;
};

function cvt_hex(val) {
    var str="";
    var i;
    var v;
    for( i=7; i>=0; i-- ) {
        v = (val>>>(i*4))&0x0f;
        str += v.toString(16);
    }
    return str;
};

function Utf8Encode(string) {
    string = string.replace(/\r\n/g,"\n");
    var utftext = "";
    for (var n = 0; n < string.length; n++) {
        var c = string.charCodeAt(n);
        if (c < 128) {
            utftext += String.fromCharCode(c);
        }
        else if((c > 127) && (c < 2048)) {
            utftext += String.fromCharCode((c >> 6) | 192);
            utftext += String.fromCharCode((c & 63) | 128);
        }
        else {
            utftext += String.fromCharCode((c >> 12) | 224);
            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
            utftext += String.fromCharCode((c & 63) | 128);
        }
    }
    return utftext;
};

function SHA1(stringToHash) {
    var blockstart;
    var i, j;
    var W = new Array(80);
    var H0 = 0x67452301;
    var H1 = 0xEFCDAB89;
    var H2 = 0x98BADCFE;
    var H3 = 0x10325476;
    var H4 = 0xC3D2E1F0;
    var A, B, C, D, E;
    var temp;
    var encodedInput
    stringToHash = Utf8Encode(stringToHash);
    var input_len = stringToHash.length;
    var word_array = new Array();
    for( i=0; i<input_len-3; i+=4 ) {
        j = stringToHash.charCodeAt(i)<<24 | stringToHash.charCodeAt(i+1)<<16 |
            stringToHash.charCodeAt(i+2)<<8 | stringToHash.charCodeAt(i+3);
        word_array.push( j );
    }
    switch( input_len % 4 ) {
        case 0:
            i = 0x080000000;
            break;
        case 1:
            i = stringToHash.charCodeAt(input_len-1)<<24 | 0x0800000;
            break;
        case 2:
            i = stringToHash.charCodeAt(input_len-2)<<24 | stringToHash.charCodeAt(input_len-1)<<16 | 0x08000;
            break;
        case 3:
            i = stringToHash.charCodeAt(input_len-3)<<24 | stringToHash.charCodeAt(input_len-2)<<16 | stringToHash.charCodeAt(input_len-1)<<8  | 0x80;
            break;
    }
    word_array.push( i );
    while( (word_array.length % 16) != 14 ) word_array.push( 0 );
    word_array.push( input_len>>>29 );
    word_array.push( (input_len<<3)&0x0ffffffff );
    for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {
        for( i=0; i<16; i++ ) W = word_array[blockstart+i];
        for( i=16; i<=79; i++ ) W = rotate_left(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
        A = H0;
        B = H1;
        C = H2;
        D = H3;
        E = H4;
        for( i= 0; i<=19; i++ ) {
            temp = (rotate_left(A,5) + ((B&C) | (~B&D)) + E + W + 0x5A827999) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B,30);
            B = A;
            A = temp;
        }
        for( i=20; i<=39; i++ ) {
            temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W + 0x6ED9EBA1) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B,30);
            B = A;
            A = temp;
        }
        for( i=40; i<=59; i++ ) {
            temp = (rotate_left(A,5) + ((B&C) | (B&D) | (C&D)) + E + W + 0x8F1BBCDC) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B,30);
            B = A;
            A = temp;
        }
        for( i=60; i<=79; i++ ) {
            temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W + 0xCA62C1D6) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B,30);
            B = A;
            A = temp;
        }
        H0 = (H0 + A) & 0x0ffffffff;
        H1 = (H1 + B) & 0x0ffffffff;
        H2 = (H2 + C) & 0x0ffffffff;
        H3 = (H3 + D) & 0x0ffffffff;
        H4 = (H4 + E) & 0x0ffffffff;
    }
    var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
return temp.toLowerCase();
   
}
var result = SHA1(input);