auth: publish passkey foundations preview

third_party/go-webauthn/protocol/challenge.go

@@ -0,0 +1,20 @@
+package protocol
+
+import (
+	"crypto/rand"
+)
+
+// ChallengeLength - Length of bytes to generate for a challenge.
+const ChallengeLength = DefaultChallengeLength
+
+// CreateChallenge creates a new challenge that should be signed and returned by the authenticator. The spec recommends
+// using at least 16 bytes with 100 bits of entropy. We use 32 bytes.
+func CreateChallenge() (challenge URLEncodedBase64, err error) {
+	challenge = make([]byte, ChallengeLength)
+
+	if _, err = rand.Read(challenge); err != nil {
+		return nil, err
+	}
+
+	return challenge, nil
+}