Use FlowXO to decode BAse64 Text

#1

I need to decode some base64 text as part of a workflow. I am sure flowxo can do this using the code service but I am not a coder and do not know how to do this. Would someone be kind enough to show me how to do this?

(Kellsey Shaw) #2

Hey there,

You’re spot on there. You can decode using the Code service. Loving a good challenge and all, we’ve had a bash at this one and managed to find a function that works well with our platform so here it is for all that want it.

/**
*
*  Base64 decode
*  http://www.webtoolkit.info/
*
**/
var Base64 = {

// private property
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",


// public method for decoding
decode : function (input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

    while (i < input.length) {

        enc1 = this._keyStr.indexOf(input.charAt(i++));
        enc2 = this._keyStr.indexOf(input.charAt(i++));
        enc3 = this._keyStr.indexOf(input.charAt(i++));
        enc4 = this._keyStr.indexOf(input.charAt(i++));

        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;

        output = output + String.fromCharCode(chr1);

        if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
        }

    }

    output = Base64._utf8_decode(output);

    return output;

},

// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
    var string = "";
    var i = 0;
    var c = 0;
    var c1 = 0;
    var c2 = 0;

    while ( i < utftext.length ) {

        c = utftext.charCodeAt(i);

        if (c < 128) {
            string += String.fromCharCode(c);
            i++;
        }
        else if((c > 191) && (c < 224)) {
            c2 = utftext.charCodeAt(i+1);
            string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
            i += 2;
        }
        else {
            c2 = utftext.charCodeAt(i+1);
            c3 = utftext.charCodeAt(i+2);
            string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
            i += 3;
        }

    }

    return string;
}

}

resolve(Base64.decode(inputs.b64String));
1 Like
#3

This is great and I really appreciate you guys jumping on this. As a correction to the above code I had to change:

utf8decode : function (utftext) {

Should be with the two additional underscores

_utf8_decode : function (utftext) {

(John Jackson) #4

I just edited Kellsey’s post to turn the script into a code block, that makes it easier to copy and paste, and fixes that problem with the __ disappearing.

(Andrew Karanda) #6

How I can encode data to base64 using the code service? And can I use sha1?
How i can realize this:

> #!/bin/bash
> PUBLIC_KEY='your_public_key'
> PRIVATE_KEY='your_private_key'
> POST_DATA='base64_post_string'
> POST_SIGNATURE='tp+ZLmKm1/E83dIzUpx5ljcttP4='
> # SIGNATURE is base64 encode result from sha1 binary hash from concatenate string ${PRIVATE_KEY}${POST_DATA}${PRIVATE_KEY}
> SIGNATURE=$(echo -n "${PRIVATE_KEY}${POST_DATA}${PRIVATE_KEY}" | openssl dgst -binary -sha1 | base64)

> if [ "x${POST_SIGNATURE}" == "x${SIGNATURE}" ]
> then
> echo "ok"
> else
> echo "invalid signature: ${POST_SIGNATURE} != ${SIGNATURE}"
> fi

> # POST_DATA in this example
> # base64_post_string

> # SIGNATURE in this example
> # tp+ZLmKm1/E83dIzUpx5ljcttP4=
(Andrew Karanda) #7

Help plz with sha1

/**

  • Secure Hash Algorithm (SHA1)

**/

function SHA1 (msg) {

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) {

    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;

};

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;

msg = Utf8Encode(msg);

var msg_len = msg.length;

var word_array = new Array();

for( i=0; i<msg_len-3; i+=4 ) {

    j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |

    msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);

    word_array.push( j );

}

switch( msg_len % 4 ) {

    case 0:

        i = 0x080000000;

    break;

    case 1:

        i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;

    break;

    case 2:

        i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;

    break;

    case 3:

        i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8    | 0x80;

    break;

}

word_array.push( i );

while( (word_array.length % 16) != 14 ) word_array.push( 0 );

word_array.push( msg_len>>>29 );

word_array.push( (msg_len<<3)&0x0ffffffff );

for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {

    for( i=0; i<16; i++ ) W[i] = word_array[blockstart+i];

    for( i=16; i<=79; i++ ) W[i] = 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[i] + 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[i] + 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[i] + 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[i] + 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();

}

(Karen Barker) #8

Hi there,

Unfortunately I’m not familar with sha1, but there’s a flow here which has a code function for both encoding and decoding to base64. I hope this helps :thumbsup:

(Andrew Karanda) #10

Thx but with base64 i have no problems