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