UwZaq9bk

1// Can be executed e.g. in: https://playcode.io/
2
3function keys(){
4    var cryptoObj = window.crypto || window.msCrypto;
5    let msg = '///';
6    if(!cryptoObj){
7        alert("Crypto API is not supported by the Browser");
8            return;
9    }
10
11    window.crypto.subtle.generateKey(
12        {
13            name: "RSA-PSS",
14            modulusLength: 2048, //can be 1024, 2048, or 4096
15            publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
16            hash: {name: "SHA-256"}, //can be "SHA-1", "SHA-256", "SHA-384", or "SHA-512"
17        },
18        true, //whether the key is extractable (i.e. can be used in exportKey)
19        ["sign", "verify"] //can be any combination of "sign" and "verify"
20    )
21    .then(function(key) {
22        publicKey = key.publicKey;
23        privateKey = key.privateKey;
24        // For Demo Purpos Only Exported in JWK format
25        if (/*document.getElementById('public').value == ""*/true) {            // Change 1
26            window.crypto.subtle.exportKey("spki", key.publicKey)
27            .then(function (keydata) {
28                publicKeyhold = keydata;
29                let exported = publicKeyhold;
30                const exportedAsString = ab2str(exported);
31                const exportedAsBase64 = window.btoa(exportedAsString);
32                const pemExported = `-----BEGIN PUBLIC KEY-----\n${exportedAsBase64}\n-----END PUBLIC KEY-----`;
33                //document.getElementById('public').value = pemExported;
34                console.log(pemExported);                                       // Change 2
35            });
36        }
37
38        if (/*document.getElementById('private').value == ""*/true) {           // Change 4     
39            //msg = document.getElementById('msg').value;
40            msg = "The quick brown fox jumps over the lazy dog";                // Change 5
41            window.crypto.subtle.exportKey("pkcs8", key.privateKey)
42            .then(function (keydata) {
43                privateKeyhold = keydata;
44                const priv = privateKeyhold;
45                const privExportedAsString = ab2str(priv);
46                const privExportedAsBase64 = window.btoa(privExportedAsString);
47                const privPemExported = `-----BEGIN RSA PRIVATE KEY-----\n${privExportedAsBase64}\n-----END RSA PRIVATE KEY-----`;
48                //document.getElementById('privJSON').data = key.privateKey;  // Change 6
49                //document.getElementById('private').value = privPemExported; // Change 7
50                console.log(key.privateKey); 
51                console.log(privPemExported); 
52            });
53        }
54
55        window.crypto.subtle.sign(
56            {
57                name: "RSA-PSS",
58                saltLength: 128, //the length of the salt
59            },
60            //from generateKey or importKey above
61            //document.getElementById('privJSON').data,                       // Change 8
62            privateKey,
63            //getMessageEncoding() //ArrayBuffer of data you want to sign
64            getMessageEncoding(msg) //ArrayBuffer of data you want to sign    // Change 9
65        ) 
66        .then(function(signature) {
67                //returns an ArrayBuffer containing the signature
68                //console.dir(ab2str(signature));                             // Change 10
69                // document.getElementById("cryptmsg").value = window.btoa(ab2str(signature)); // Change 11
70                console.log(window.btoa(ab2str(signature)));
71        });
72    });
73}
74
75function ab2str(buf) {
76    return String.fromCharCode.apply(null, new Uint8Array(buf));
77}
78
79function asciiToUint8Array(str) {
80    var chars = [];
81    for (var i = 0; i < str.length; ++i)
82        chars.push(str.charCodeAt(i));
83    return new Uint8Array(chars);
84}
85
86function bytesToHexString(bytes) {
87    if (!bytes)
88        return null;
89
90    bytes = new Uint8Array(bytes);
91    var hexBytes = [];
92
93    for (var i = 0; i < bytes.length; ++i) {
94        var byteString = bytes[i].toString(16);
95        if (byteString.length < 2)
96            byteString = "0" + byteString;
97        hexBytes.push(byteString);
98    }
99
100    return hexBytes.join("");
101}
102
103function getMessageEncoding(message) {                                        // Change 12
104    //const messageBox = document.getElementById('msg');
105    //let message = messageBox.value;
106    let enc = new TextEncoder();
107    return enc.encode(message);
108}
109
110keys();