From 93f96f060bb2eeb881620847b523817d93032c43 Mon Sep 17 00:00:00 2001
From: Code Coffee <codecoffee@Codes-MacBook-Pro.local>
Date: Sun, 12 Feb 2023 02:11:38 +0545
Subject: [PATCH] WIP:Draft

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+NIP-XX
+======
+
+Nostr specific keys from Ethereum wallet signatures
+----------------------------------------------------
+
+`draft` `optional` `author:0xc0de4c0ffee` `author:sshmatrix`
+
+This NIP ?is optional specification for Nostr clients to generate private key from deterministic Ethereum wallet signatures.
+
+
+A) Username : 
+```
+let username = "mypetname" || "mynip05@domain.eth.limo" || "domain.eth.limo" || "sub.domain.eth.limo"
+```
+
+   1) `mypetname` is NIP02 compatible name
+   2) `mynip05@domain.eth.limo` is NIP05 compatible ID
+   3) `domain.eth.limo` is NIP05 equivalent to `_@domain.eth.limo`
+   4) `sub.domain.eth.limo` is NIP05 equivalent to `_@sub.domain.eth.limo`
+
+~~Implementing clients should verify if generated public keys match NIP05 and NIP02 records.~~ 
+
+B) Message : 
+```
+let message = `Login to Nostr as ${username}\n\nWARNING : DO NOT SIGN THIS REQUEST FROM UNTRUSTED NOSTR CLIENTS.\n${checksum(wallet.address)}`
+```
+
+C) Private Key : 
+
+```js
+import { hkdf } from '@noble/hashes/hkdf';
+import { sha256 } from '@noble/hashes/sha256';
+import * as secp256k1 from '@noble/secp256k1';
+
+let username = 'name@domain.eth.limo';
+let optPassword = "horse staple battery"; 
+// optional pin/password
+
+let address = wallet.getAddress(); 
+// get checksum'd address from eth wallet
+let signature = wallet.signMessage(message); 
+// request signature from eth wallet
+// 0x + bytes1 + bytes32 + bytes32 
+//  2 + (2     +   64    +     64) = 132 length  
+
+let inputKey = sha256(signature);
+let salt = sha256(`nostr:${username}:${optPassword}:${signature.slice(68)}`); //68~132
+// nostr:${username}:${signature.slice(68)}
+
+let info = `nostr:${username}:${address}`;
+
+let dkLen = 42; // 32 + 8 + 2
+//FIPS 186 B.4.1 limit must be >=keylen+8
+
+let hashKey = hkdf(sha256, inputKey, salt, info, dkLen);
+let privKey = nobleSecp256k1.hashToPrivateKey(hashKey); 
+//FIPS 186 B.4.1 @noble/secp256k1
+
+let pubKey = nobleSecp256k1.getPublicKey(privKey)
+```
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