JavaScript Verify a signature using a certificate RSA Javascript verify signature using openssl,verify signature using public key,verify

(A note to other members of StackOverflow, I am also in this class so there's a bit of stuff that I mention that comes out of nowhere in regards to variables and other references.)

In the verifyCertificate function:

function verifyCertificate(signedCert, certname) {
    var loadedCert = loadCert(certname);

    // signedCert is the same as loadedCert above, the button runs the
    // loadCert function and outputs the contents into the textarea,
    // so the following will always be true.

    var originalSig = JSON.stringify(signedCert.sig);
    var loadedSig = JSON.stringify(loadedCert.sig);
    log(loadedSig);
    return (originalSig == loadedSig);
}

How am I supposed to verify the certificate then? What am I comparing the loaded CA certificate to? I thought maybe compare the public key in the certificate to the public key used to sign the message but... I don't know. I'm very confused.

You're on the right track with that though, think about the verify() function, and the details contained in the CApk variable at the top of the file. Can you hash the message from the loadCert() JSON response and match it against the output from:

function verify() {
    //[...]
    key.setPublic(pk.n, pk.e);
    //[...]
}

Assuming you change a few variables?

It's similar to the method I used at least, so I'm hoping it's right. I figure if you can hash the message using the details in CApk, and compare it to a hash of the message contained in the JSON response, that verifies the certificate. Hopefully.

Answer:1

There is an error in 'verify certificate' approach. you need to test the signature of certificate with public key of CA given in 355a3_main to verify, the code given here will only verify your certificate and will give s false positive for rest

i think this should work

var loadedCert = loadCert(certname);
var originalSig = JSON.stringify(signedCert.sig);
var loadedSig = JSON.stringify(loadedCert.sig);
log(loadedSig,originalSig);

var key = new RSAKey();
var s = JSON.stringify(signedCert.sig).toString(CryptoJS.enc.Hex);
s = new BigInteger(s, 16);
key.setPublic(CApk.n, CApk.e);
var v = key.doPublic(s).toString(16);
var h = CryptoJS.SHA256(JSON.stringify(signedCert.msg)).toString(CryptoJS.enc.Hex);

if (originalSig == loadedSig && v==h)
return true;
else
return false;
Answer:2

That being said what about the long message of arbitrary length?

Answer:3

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