philholden · July 28, 2025 13:31 · tjconcept · Oct 16, 2024 · getify · Oct 16, 2024
diff --git a/webauthn.js b/webauthn.js
 // paste in console of any https site to run (e.g. this page)
 // sample arguments for registration
 // https://fidoalliance.org/specs/fido-u2f-v1.1-id-20160915/fido-u2f-raw-message-formats-v1.1-id-20160915.html#authentication-response-message-success

 var createCredentialDefaultArgs = {
    publicKey: {
        // Relying Party (a.k.a. - Service):
        rp: {
            name: "Acme"
        },

        // User:
        user: {
            id: new Uint8Array(16),
            name: "[email protected]",
            displayName: "John P. Smith"
        },

        pubKeyCredParams: [{
            type: "public-key",
            alg: -7
        }],

        attestation: "direct",

        timeout: 60000,

        challenge: new Uint8Array([ // must be a cryptographically random number sent from a server
            0x8C, 0x0A, 0x26, 0xFF, 0x22, 0x91, 0xC1, 0xE9, 0xB9, 0x4E, 0x2E, 0x17, 0x1A, 0x98, 0x6A, 0x73,
            0x71, 0x9D, 0x43, 0x48, 0xD5, 0xA7, 0x6A, 0x15, 0x7E, 0x38, 0x94, 0x52, 0x77, 0x97, 0x0F, 0xEF
        ]).buffer
    }
 };

 // sample arguments for login
 var getCredentialDefaultArgs = {
    publicKey: {
        timeout: 60000,
        // allowCredentials: [newCredential] // see below
        challenge: new Uint8Array([ // must be a cryptographically random number sent from a server
            0x79, 0x50, 0x68, 0x71, 0xDA, 0xEE, 0xEE, 0xB9, 0x94, 0xC3, 0xC2, 0x15, 0x67, 0x65, 0x26, 0x22,
            0xE3, 0xF3, 0xAB, 0x3B, 0x78, 0x2E, 0xD5, 0x6F, 0x81, 0x26, 0xE2, 0xA6, 0x01, 0x7D, 0x74, 0x50
        ]).buffer
    },
 };

 // register / create a new credential
 var cred = await navigator.credentials.create(createCredentialDefaultArgs)
 console.log("NEW CREDENTIAL", cred);

 // normally the credential IDs available for an account would come from a server
 // but we can just copy them from above...
 var idList = [{
    id: cred.rawId,
    transports: ["usb", "nfc", "ble"],
    type: "public-key"
 }];
 getCredentialDefaultArgs.publicKey.allowCredentials = idList;

 var assertation = await navigator.credentials.get(getCredentialDefaultArgs);
 console.log("ASSERTION", assertation);

 // verify signature on server
 var signature = await assertation.response.signature;
 console.log("SIGNATURE", signature)

 var clientDataJSON = await assertation.response.clientDataJSON;
 console.log("clientDataJSON", clientDataJSON)

 var authenticatorData = new Uint8Array(await assertation.response.authenticatorData);
 console.log("authenticatorData", authenticatorData)

 var clientDataHash = new Uint8Array(await crypto.subtle.digest("SHA-256", clientDataJSON));
 console.log("clientDataHash", clientDataHash)

 // concat authenticatorData and clientDataHash
 var signedData = new Uint8Array(authenticatorData.length + clientDataHash.length);
 signedData.set(authenticatorData);
 signedData.set(clientDataHash, authenticatorData.length);
 console.log("signedData", signedData)

 // import key
 var key = await crypto.subtle.importKey(
 // The getPublicKey() operation thus returns the credential public key as a SubjectPublicKeyInfo. See:
 // 
 // https://w3c.github.io/webauthn/#sctn-public-key-easy
 //
 // crypto.subtle can import the spki format:
 // 
 // https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/importKey
  "spki", // "spki" Simple Public Key Infrastructure rfc2692

  cred.response.getPublicKey(),
  {
    // these are the algorithm options
    // await cred.response.getPublicKeyAlgorithm() // returns -7
    // -7 is ES256 with P-256 // search -7 in https://w3c.github.io/webauthn
    // the W3C webcrypto docs:
    //
    // https://www.w3.org/TR/WebCryptoAPI/#informative-references (scroll down a bit)
    //
    // ES256 corrisponds with the following AlgorithmIdentifier:
    name: "ECDSA",
    namedCurve: "P-256",
    hash: { name: "SHA-256" }
  },
  false, //whether the key is extractable (i.e. can be used in exportKey)
  ["verify"] //"verify" for public key import, "sign" for private key imports
 );

 // check signature with public key and signed data 
 var verified = await crypto.subtle.verify(
  { name: "ECDSA", namedCurve: "P-256", hash: { name: "SHA-256" } },
  key,
  signature,
  signedData.buffer
 );
 // verified is false I want it to be true
 console.log('verified', verified)
	// paste in console of any https site to run (e.g. this page)
	// sample arguments for registration
	// https://fidoalliance.org/specs/fido-u2f-v1.1-id-20160915/fido-u2f-raw-message-formats-v1.1-id-20160915.html#authentication-response-message-success

	var createCredentialDefaultArgs = {
	publicKey: {
	// Relying Party (a.k.a. - Service):
	rp: {
	name: "Acme"
	},

	// User:
	user: {
	id: new Uint8Array(16),
	name: "[email protected]",
	displayName: "John P. Smith"
	},

	pubKeyCredParams: [{
	type: "public-key",
	alg: -7
	}],

	attestation: "direct",

	timeout: 60000,

	challenge: new Uint8Array([ // must be a cryptographically random number sent from a server
	0x8C, 0x0A, 0x26, 0xFF, 0x22, 0x91, 0xC1, 0xE9, 0xB9, 0x4E, 0x2E, 0x17, 0x1A, 0x98, 0x6A, 0x73,
	0x71, 0x9D, 0x43, 0x48, 0xD5, 0xA7, 0x6A, 0x15, 0x7E, 0x38, 0x94, 0x52, 0x77, 0x97, 0x0F, 0xEF
	]).buffer
	}
	};

	// sample arguments for login
	var getCredentialDefaultArgs = {
	publicKey: {
	timeout: 60000,
	// allowCredentials: [newCredential] // see below
	challenge: new Uint8Array([ // must be a cryptographically random number sent from a server
	0x79, 0x50, 0x68, 0x71, 0xDA, 0xEE, 0xEE, 0xB9, 0x94, 0xC3, 0xC2, 0x15, 0x67, 0x65, 0x26, 0x22,
	0xE3, 0xF3, 0xAB, 0x3B, 0x78, 0x2E, 0xD5, 0x6F, 0x81, 0x26, 0xE2, 0xA6, 0x01, 0x7D, 0x74, 0x50
	]).buffer
	},
	};

	// register / create a new credential
	var cred = await navigator.credentials.create(createCredentialDefaultArgs)
	console.log("NEW CREDENTIAL", cred);

	// normally the credential IDs available for an account would come from a server
	// but we can just copy them from above...
	var idList = [{
	id: cred.rawId,
	transports: ["usb", "nfc", "ble"],
	type: "public-key"
	}];
	getCredentialDefaultArgs.publicKey.allowCredentials = idList;

	var assertation = await navigator.credentials.get(getCredentialDefaultArgs);
	console.log("ASSERTION", assertation);

	// verify signature on server
	var signature = await assertation.response.signature;
	console.log("SIGNATURE", signature)

	var clientDataJSON = await assertation.response.clientDataJSON;
	console.log("clientDataJSON", clientDataJSON)

	var authenticatorData = new Uint8Array(await assertation.response.authenticatorData);
	console.log("authenticatorData", authenticatorData)

	var clientDataHash = new Uint8Array(await crypto.subtle.digest("SHA-256", clientDataJSON));
	console.log("clientDataHash", clientDataHash)

	// concat authenticatorData and clientDataHash
	var signedData = new Uint8Array(authenticatorData.length + clientDataHash.length);
	signedData.set(authenticatorData);
	signedData.set(clientDataHash, authenticatorData.length);
	console.log("signedData", signedData)

	// import key
	var key = await crypto.subtle.importKey(
	// The getPublicKey() operation thus returns the credential public key as a SubjectPublicKeyInfo. See:
	//
	// https://w3c.github.io/webauthn/#sctn-public-key-easy
	//
	// crypto.subtle can import the spki format:
	//
	// https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/importKey
	"spki", // "spki" Simple Public Key Infrastructure rfc2692

	cred.response.getPublicKey(),
	{
	// these are the algorithm options
	// await cred.response.getPublicKeyAlgorithm() // returns -7
	// -7 is ES256 with P-256 // search -7 in https://w3c.github.io/webauthn
	// the W3C webcrypto docs:
	//
	// https://www.w3.org/TR/WebCryptoAPI/#informative-references (scroll down a bit)
	//
	// ES256 corrisponds with the following AlgorithmIdentifier:
	name: "ECDSA",
	namedCurve: "P-256",
	hash: { name: "SHA-256" }
	},
	false, //whether the key is extractable (i.e. can be used in exportKey)
	["verify"] //"verify" for public key import, "sign" for private key imports
	);

	// check signature with public key and signed data
	var verified = await crypto.subtle.verify(
	{ name: "ECDSA", namedCurve: "P-256", hash: { name: "SHA-256" } },
	key,
	signature,
	signedData.buffer
	);
	// verified is false I want it to be true
	console.log('verified', verified)