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@ -9,7 +9,7 @@ Nostr specific keys from Ethereum wallet signatures
This NIP ?is optional specification for Nostr clients to generate private key from deterministic Ethereum wallet signatures.
A) Username :
## A) Username :
```
let username = "mypetname" || "mynip05@domain.eth.limo" || "domain.eth.limo" || "sub.domain.eth.limo"
```
@ -21,28 +21,44 @@ let username = "mypetname" || "mynip05@domain.eth.limo" || "domain.eth.limo" ||
~~Implementing clients should verify if generated public keys match NIP05 and NIP02 records.~~
B) Message :
## B) Password :
Password is optional value used in HKDF salt:
```js
let username = "name@domain.eth.limo"
let password = "horse staple battery"
let signature = wallet.signMessage(message)
let salt = sha256(`nostr:${username}:${password}:${signature.slice(68)}`);
if(!password || password == ""){
salt = sha256(`nostr:${username}:${signature.slice(68)}`)
}
```
## C) Message :
```js
let message = `Login to Nostr as ${username}\n\nWARNING : DO NOT SIGN THIS REQUEST FROM UNTRUSTED NOSTR CLIENTS.\n${checksum(wallet.address)}`
```
## D) Signature :
Signature is
C) Private Key :
## C) HKDF :
We use HKDF with SHA256
```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";
//let username = 'name@domain.eth.limo';
//let optPassword = "horse staple battery";
// optional pin/password
let address = wallet.getAddress();
//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 signature = wallet.signMessage(message);
// request signature from eth wallet (v,r,s)
// 0x + bytes1(v) + bytes32(r) + bytes32(s)
// 2 + (2 + 64 + 64) = 132 String length
let inputKey = sha256(signature);
let salt = sha256(`nostr:${username}:${optPassword}:${signature.slice(68)}`); //68~132
@ -58,4 +74,14 @@ let privKey = nobleSecp256k1.hashToPrivateKey(hashKey);
//FIPS 186 B.4.1 @noble/secp256k1
let pubKey = nobleSecp256k1.getPublicKey(privKey)
```
```
## Reference :
1) ERC-191: Signed Data Standard - https://eips.ethereum.org/EIPS/eip-191
2) RFC6979: Deterministic Usage of the DSA and ECDSA - https://datatracker.ietf.org/doc/html/rfc6979
3) RFC5869: HMAC-based Extract-and-Expand Key Derivation Function (HKDF) - https://datatracker.ietf.org/doc/html/rfc5869
4) FIPS 186 B.4.1 - https://csrc.nist.gov/publications/detail/fips/186/4/final