It appears that I need to pay more attention to GFM. Trying again:

----walletDecrypt.html

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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript">

(typeof Crypto=="undefined"||!Crypto.util)&&function(){var a=window.Crypto={},b=a.util={rotl:function(a,b){return a<<b|a>>>32-b},rotr:function(a,b){return a<<32-b|a>>>b},endian:function(a){if(a.constructor==Number)return b.rotl(a,8)&16711935|b.rotl(a,24)&4278255360;for(var c=0;c<a.length;c++)a[c]=b.endian(a[c]);return a},randomBytes:function(a){for(var b=[];a>0;a--)b.push(Math.floor(Math.random()*256));return b},bytesToWords:function(a){for(var b=[],c=0,d=0;c<a.length;c++,d+=8)b[d>>>5]|=(a[c]&255)<<24-d%32;return b},wordsToBytes:function(a){for(var b=[],c=0;c<a.length*32;c+=8)b.push(a[c>>>5]>>>24-c%32&255);return b},bytesToHex:function(a){for(var b=[],c=0;c<a.length;c++)b.push((a[c]>>>4).toString(16)),b.push((a[c]&15).toString(16));return b.join("")},hexToBytes:function(a){for(var b=[],c=0;c<a.length;c+=2)b.push(parseInt(a.substr(c,2),16));return b},bytesToBase64:function(a){if(typeof btoa=="function")return btoa(c.bytesToString(a));for(var b=[],d=0;d<a.length;d+=3)for(var e=a[d]<<16|a[d+1]<<8|a[d+2],g=0;g<4;g++)d*8+g*6<=a.length*8?b.push("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".charAt(e>>>6*(3-g)&63)):b.push("=");return b.join("")},base64ToBytes:function(a){if(typeof atob=="function")return c.stringToBytes(atob(a));for(var a=a.replace(/[^A-Z0-9+\/]/ig,""),b=[],d=0,e=0;d<a.length;e=++d%4)e!=0&&b.push(("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(a.charAt(d-1))&Math.pow(2,-2*e+8)-1)<<e*2|"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(a.charAt(d))>>>6-e*2);return b}},a=a.charenc={};a.UTF8={stringToBytes:function(a){return c.stringToBytes(unescape(encodeURIComponent(a)))},bytesToString:function(a){return decodeURIComponent(escape(c.bytesToString(a)))}};var c=a.Binary={stringToBytes:function(a){for(var b=[],c=0;c<a.length;c++)b.push(a.charCodeAt(c)&255);return b},bytesToString:function(a){for(var b=[],c=0;c<a.length;c++)b.push(String.fromCharCode(a[c]));return b.join("")}}}();(function(){var a=Crypto,b=a.util,c=a.charenc,d=c.UTF8,e=c.Binary,f=a.SHA1=function(a,c){var d=b.wordsToBytes(f._sha1(a));return c&&c.asBytes?d:c&&c.asString?e.bytesToString(d):b.bytesToHex(d)};f._sha1=function(a){a.constructor==String&&(a=d.stringToBytes(a));var c=b.bytesToWords(a),e=a.length*8,a=[],f=1732584193,g=-271733879,h=-1732584194,i=271733878,k=-1009589776;c[e>>5]|=128<<24-e%32;c[(e+64>>>9<<4)+15]=e;for(e=0;e<c.length;e+=16){for(var l=f,m=g,n=h,o=i,p=k,q=0;q<80;q++){if(q<16)a[q]=c[e+q];else{var r=a[q-3]^a[q-8]^a[q-14]^a[q-16];a[q]=r<<1|r>>>31}r=(f<<5|f>>>27)+k+(a[q]>>>0)+(q<20?(g&h|~g&i)+1518500249:q<40?(g^h^i)+1859775393:q<60?(g&h|g&i|h&i)-1894007588:(g^h^i)-899497514);k=i;i=h;h=g<<30|g>>>2;g=f;f=r}f+=l;g+=m;h+=n;i+=o;k+=p}return[f,g,h,i,k]};f._blocksize=16;f._digestsize=20})();(function(){var a=Crypto,b=a.util,c=a.charenc,d=c.UTF8,e=c.Binary;a.HMAC=function(a,c,f,g){c.constructor==String&&(c=d.stringToBytes(c));f.constructor==String&&(f=d.stringToBytes(f));f.length>a._blocksize*4&&(f=a(f,{asBytes:!0}));for(var h=f.slice(0),f=f.slice(0),i=0;i<a._blocksize*4;i++)h[i]^=92,f[i]^=54;a=a(h.concat(a(f.concat(c),{asBytes:!0})),{asBytes:!0});return g&&g.asBytes?a:g&&g.asString?e.bytesToString(a):b.bytesToHex(a)}})();(function(){var a=Crypto,b=a.util,c=a.charenc,d=c.UTF8,e=c.Binary;a.PBKDF2=function(c,f,g,h){function i(b,c){return a.HMAC(k,c,b,{asBytes:!0})}c.constructor==String&&(c=d.stringToBytes(c));f.constructor==String&&(f=d.stringToBytes(f));for(var k=h&&h.hasher||a.SHA1,l=h&&h.iterations||1,m=[],n=1;m.length<g;){for(var o=i(c,f.concat(b.wordsToBytes([n]))),p=o,q=1;q<l;q++)for(var p=i(c,p),r=0;r<o.length;r++)o[r]^=p[r];m=m.concat(o);n++}m.length=g;return h&&h.asBytes?m:h&&h.asString?e.bytesToString(m):b.bytesToHex(m)}})();(function(a){function b(a,b){var c=a._blocksize*4;return c-b.length%c}var c=a.pad={},d=function(a){for(var b=a.pop(),c=1;c<b;c++)a.pop()};c.NoPadding={pad:function(){},unpad:function(){}};c.ZeroPadding={pad:function(a,b){var c=a._blocksize*4,d=b.length%c;if(d!=0)for(d=c-d;d>0;d--)b.push(0)},unpad:function(){}};c.iso7816={pad:function(a,c){var d=b(a,c);for(c.push(128);d>1;d--)c.push(0)},unpad:function(a){for(;a.pop()!=128;);}};c.ansix923={pad:function(a,c){for(var d=b(a,c),e=1;e<d;e++)c.push(0);c.push(d)},unpad:d};c.iso10126={pad:function(a,c){for(var d=b(a,c),e=1;e<d;e++)c.push(Math.floor(Math.random()*256));c.push(d)},unpad:d};c.pkcs7={pad:function(a,c){for(var d=b(a,c),e=0;e<d;e++)c.push(d)},unpad:d};var a=a.mode={},e=a.Mode=function(a){if(a)this._padding=a};e.prototype={encrypt:function(a,b,c){this._padding.pad(a,b);this._doEncrypt(a,b,c)},decrypt:function(a,b,c){this._doDecrypt(a,b,c);this._padding.unpad(b)},_padding:c.iso7816};d=(a.ECB=function(){e.apply(this,arguments)}).prototype=new e;d._doEncrypt=function(a,b){for(var c=a._blocksize*4,d=0;d<b.length;d+=c)a._encryptblock(b,d)};d._doDecrypt=function(a,b){for(var c=a._blocksize*4,d=0;d<b.length;d+=c)a._decryptblock(b,d)};d.fixOptions=function(a){a.iv=[]};d=(a.CBC=function(){e.apply(this,arguments)}).prototype=new e;d._doEncrypt=function(a,b,c){for(var d=a._blocksize*4,e=0;e<b.length;e+=d){if(e==0)for(var f=0;f<d;f++)b[f]^=c[f];else for(f=0;f<d;f++)b[e+f]^=b[e+f-d];a._encryptblock(b,e)}};d._doDecrypt=function(a,b,c){for(var d=a._blocksize*4,e=0;e<b.length;e+=d){var f=b.slice(e,e+d);a._decryptblock(b,e);for(var g=0;g<d;g++)b[e+g]^=c[g];c=f}};d=(a.CFB=function(){e.apply(this,arguments)}).prototype=new e;d._padding=c.NoPadding;d._doEncrypt=function(a,b,c){for(var d=a._blocksize*4,c=c.slice(0),e=0;e<b.length;e++){var f=e%d;f==0&&a._encryptblock(c,0);b[e]^=c[f];c[f]=b[e]}};d._doDecrypt=function(a,b,c){for(var d=a._blocksize*4,c=c.slice(0),e=0;e<b.length;e++){var f=e%d;f==0&&a._encryptblock(c,0);var g=b[e];b[e]^=c[f];c[f]=g}};d=(a.OFB=function(){e.apply(this,arguments)}).prototype=new e;d._padding=c.NoPadding;d._doEncrypt=function(a,b,c){for(var d=a._blocksize*4,c=c.slice(0),e=0;e<b.length;e++)e%d==0&&a._encryptblock(c,0),b[e]^=c[e%d]};d._doDecrypt=d._doEncrypt;a=(a.CTR=function(){e.apply(this,arguments)}).prototype=new e;a._padding=c.NoPadding;a._doEncrypt=function(a,b,c){for(var d=a._blocksize*4,c=c.slice(0),e=0;e<b.length;){var f=c.slice(0);a._encryptblock(f,0);for(var g=0;e<b.length&&g<d;g++,e++)b[e]^=f[g];++c[d-1]==256&&(c[d-1]=0,++c[d-2]==256&&(c[d-2]=0,++c[d-3]==256&&(c[d-3]=0,++c[d-4])))}};a._doDecrypt=a._doEncrypt})(Crypto);(function(){function a(a,b){for(var c=0,d=0;d<8;d++){b&1&&(c^=a);var e=a&128,a=a<<1&255;e&&(a^=27);b>>>=1}return c}for(var b=Crypto,c=b.util,d=b.charenc.UTF8,e=[99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,114,192,183,253,147,38,54,63,247,204,52,165,229,241,113,216,49,21,4,199,35,195,24,150,5,154,7,18,128,226,235,39,178,117,9,131,44,26,27,110,90,160,82,59,214,179,41,227,47,132,83,209,0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,170,251,67,77,51,133,69,249,2,127,80,60,159,168,81,163,64,143,146,157,56,245,188,182,218,33,16,255,243,210,205,12,19,236,95,151,68,23,196,167,126,61,100,93,25,115,96,129,79,220,34,42,144,136,70,238,184,20,222,94,11,219,224,50,58,10,73,6,36,92,194,211,172,98,145,149,228,121,231,200,55,109,141,213,78,169,108,86,244,234,101,122,174,8,186,120,37,46,28,166,180,198,232,221,116,31,75,189,139,138,112,62,181,102,72,3,246,14,97,53,87,185,134,193,29,158,225,248,152,17,105,217,142,148,155,30,135,233,206,85,40,223,140,161,137,13,191,230,66,104,65,153,45,15,176,84,187,22],f=[],g=0;g<256;g++)f[e[g]]=g;for(var h=[],i=[],j=[],k=[],l=[],m=[],g=0;g<256;g++)h[g]=a(g,2),i[g]=a(g,3),j[g]=a(g,9),k[g]=a(g,11),l[g]=a(g,13),m[g]=a(g,14);var n=[0,1,2,4,8,16,32,64,128,27,54],o=[[],[],[],[]],p,q,r,s=b.AES={encrypt:function(a,e,f){var f=f||{},g=f.mode||new b.mode.OFB;g.fixOptions&&g.fixOptions(f);var a=a.constructor==String?d.stringToBytes(a):a,h=f.iv||c.randomBytes(s._blocksize*4),e=e.constructor==String?b.PBKDF2(e,h,32,{asBytes:!0,iterations:f.iterations}):e;s._init(e);g.encrypt(s,a,h);a=f.iv?a:h.concat(a);return f&&f.asBytes?a:c.bytesToBase64(a)},decrypt:function(a,e,f){var f=f||{},g=f.mode||new b.mode.OFB;g.fixOptions&&g.fixOptions(f);var a=a.constructor==String?c.base64ToBytes(a):a,h=f.iv||a.splice(0,s._blocksize*4),e=e.constructor==String?b.PBKDF2(e,h,32,{asBytes:!0,iterations:f.iterations}):e;s._init(e);g.decrypt(s,a,h);return f&&f.asBytes?a:d.bytesToString(a)},_blocksize:4,_encryptblock:function(a,b){for(var c=0;c<s._blocksize;c++)for(var d=0;d<4;d++)o[c][d]=a[b+d*4+c];for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[d][c];for(var f=1;f<q;f++){for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]=e[o[c][d]];o[1].push(o[1].shift());o[2].push(o[2].shift());o[2].push(o[2].shift());o[3].unshift(o[3].pop());for(d=0;d<4;d++){var c=o[0][d],g=o[1][d],j=o[2][d],k=o[3][d];o[0][d]=h[c]^i[g]^j^k;o[1][d]=c^h[g]^i[j]^k;o[2][d]=c^g^h[j]^i[k];o[3][d]=i[c]^g^j^h[k]}for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[f*4+d][c]}for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]=e[o[c][d]];o[1].push(o[1].shift());o[2].push(o[2].shift());o[2].push(o[2].shift());o[3].unshift(o[3].pop());for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[q*4+d][c];for(c=0;c<s._blocksize;c++)for(d=0;d<4;d++)a[b+d*4+c]=o[c][d]},_decryptblock:function(a,b){for(var c=0;c<s._blocksize;c++)for(var d=0;d<4;d++)o[c][d]=a[b+d*4+c];for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[q*4+d][c];for(var e=1;e<q;e++){o[1].unshift(o[1].pop());o[2].push(o[2].shift());o[2].push(o[2].shift());o[3].push(o[3].shift());for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]=f[o[c][d]];for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[(q-e)*4+d][c];for(d=0;d<4;d++){var c=o[0][d],g=o[1][d],h=o[2][d],i=o[3][d];o[0][d]=m[c]^k[g]^l[h]^j[i];o[1][d]=j[c]^m[g]^k[h]^l[i];o[2][d]=l[c]^j[g]^m[h]^k[i];o[3][d]=k[c]^l[g]^j[h]^m[i]}}o[1].unshift(o[1].pop());o[2].push(o[2].shift());o[2].push(o[2].shift());o[3].push(o[3].shift());for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]=f[o[c][d]];for(c=0;c<4;c++)for(d=0;d<4;d++)o[c][d]^=r[d][c];for(c=0;c<s._blocksize;c++)for(d=0;d<4;d++)a[b+d*4+c]=o[c][d]},_init:function(a){p=a.length/4;q=p+6;s._keyexpansion(a)},_keyexpansion:function(a){r=[];for(var b=0;b<p;b++)r[b]=[a[b*4],a[b*4+1],a[b*4+2],a[b*4+3]];for(b=p;b<s._blocksize*(q+1);b++)a=[r[b-1][0],r[b-1][1],r[b-1][2],r[b-1][3]],b%p==0?(a.push(a.shift()),a[0]=e[a[0]],a[1]=e[a[1]],a[2]=e[a[2]],a[3]=e[a[3]],a[0]^=n[b/p]):p>6&&b%p==4&&(a[0]=e[a[0]],a[1]=e[a[1]],a[2]=e[a[2]],a[3]=e[a[3]]),r[b]=[r[b-p][0]^a[0],r[b-p][1]^a[1],r[b-p][2]^a[2],r[b-p][3]^a[3]]}}})()
//Changed padding to CBC iso10126 9th March 2012

//****** this function didn't test correctly for base58 alphabet, just numerical values 1-58
function isBase58(str) {
    var base58alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';  
    for (var i = 0; i < str.length; ++i) {
        if (base58alphabet.indexOf(str[i]) == -1) { //****** used to be: str[i] < 0 || str[i] > 58
            return false;
        }
    }
    return true;
}


function decrypt(data, password, success, error, backup_found_cb) {

    var modes = [
        'default',
        new Crypto.mode.CBC(Crypto.pad.iso10126),
        new Crypto.mode.CBC(Crypto.pad.NoPadding),
        new Crypto.mode.CBC(Crypto.pad.ZeroPadding)];

    var mi = 0;
    function test_mode() {
        var mode = modes[mi];

        console.log('Test Mode ' + mi);

        for (var i = 10; i < 20; ++i) {
            try {
                if (mode == 'default')
                    var decoded = Crypto.AES.decrypt(data, password);
               else
                    var decoded = Crypto.AES.decrypt(data, password, { mode: mode, iterations : i });


                if (decoded != null && decoded.length > 0) {
                    if (success(decoded)) {
                        backup_found_cb(decoded);
                        return;
                    };
                };
            } catch (e) {
                console.log(e);
            }
        }

        for (var i = 0; i < 10; ++i) {
            try {
                if (mode == 'default')
                    var decoded = Crypto.AES.decrypt(data, password);
                else
                    var decoded = Crypto.AES.decrypt(data, password, { mode: mode, iterations : i });

                if (decoded != null && decoded.length > 0) {
                    if (success(decoded)) {
                        backup_found_cb(decoded);
                        return;
                    };
                };
            } catch (e) {
                console.log(e);
            }
        }

    //****** no point in repeating function infinitely if all test modes have been tried!
        if (mi < modes.length){ 
            ++mi;
            setTimeout(test_mode, 2000);
        }
    }

    test_mode();

    if (error != null) 
        error();

    return null;
}

function do_decrypt() {
    try {
       document.getElementById('error').innerHTML = '';

       var encrypted = document.getElementById('enc-json').value;

       if (encrypted == null || encrypted.length == 0)
            throw 'You must copy and paste your encrypted backup into the first text area';

        var password = document.getElementById('password').value;

        if (password == null || password.length == 0) {
            throw 'You must enter a password';
        }

        decrypt(encrypted, password, function(decrypted) {
            try {                               
                obj = JSON.parse(decrypted);

                return (obj != null);
            } catch (e) {
                console.log(e);
                return false;
            };
        }, function(e) {
            console.log(e);
        }, function(decrypted) {
            if (decrypted == null || decrypted.length == 0)
                throw 'No backup returned';

            var obj = JSON.parse(decrypted);

            //****** factoring this out so it doesn't print output to HTML page before all decryption is done,
            //****** page will continue to refresh as decryption takes place
            printOutput = function(obj){
                var ul = document.getElementById('ul-keys');

                //****** this is going to be a clear-and-refresh procedure until its all done
                ul.innerHTML = ''; 
                for (var i = 0; i < obj.keys.length; ++i) {
                    var li = document.createElement('li');
                    li.innerHTML = '<b>'+ obj.keys[i].addr + '</b>      -       ' + obj.keys[i].priv; 
                    ul.appendChild(li);
                }

                document.getElementById('plain-json').value = JSON.stringify(obj, undefined, 2);
            }

            if (obj.double_encryption) {
                var pass = prompt("Please enter your second password", null);

                for (var i = 0; i < obj.keys.length; ++i) {

                    //****** watch-only addresses don't have keys, decryption produces a weird output
                    if (obj.keys[i].priv){ 

                        //****** JavaScript closure
                        attachPrivKey = (function(keyIndex){ return function(output){ obj.keys[keyIndex].priv = output; printOutput(obj)} })(i);  

                        //****** decrypt() was called without parameters for error and backup_found_cb 
                        decrypt(obj.keys[i].priv, obj.sharedKey + pass, isBase58, function(e){console.log(e);}, attachPrivKey);               
                    }
                }   
                // decrypted = JSON.stringify(obj); //****** printing to HTML now handled elsewhere
            } else {
                printOutput(obj);
            }
        });
    } catch(e) {
        console.log(e);

        document.getElementById('error').innerHTML = 'Unable to decrypt backup ' + e;
    }
}

</script>

</head>

<body>

    <h1>Paste Encrypted JSON Backup</h1>

    <textarea class="xxlarge" name="textarea" id="enc-json" style="width: 100%; height: 245px;" placeholder="Encrypted JSON Data"></textarea>

    <p>Password:</p>

    <input type="password" name="password" id="password">

    <p>Decode:</p>
    <input type="submit" value="Decode" onclick="do_decrypt()">


    <h1>Result</h1>
<!--    //****** Added for clarity. the private key is NOT in wallet import format. 
    //***** Bitaddress.org, for example, can not import this private key format at this time -->
    <i>Private keys displayed in raw base58 (not wallet import format)</i> 
    <ul id="ul-keys"></ul>

    Raw:
    <br>

    <textarea class="xxlarge" name="textarea" id="plain-json" style="width: 100%; height: 175px;" placeholder="JSON Data"></textarea>

    <p><font color="red" style="font-size:18px" id="error"></font></p>



</body></html>

fix / improve support for cracking Blockchain wallets #663

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