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@ -5,7 +5,7 @@ Nostr-Specific Deterministic Private Key Generation from Ethereum Wallet Signatu
## Abstract
This specification provides an optional method for Nostr clients to generate deterministic private keys from Ethereum wallet signatures. This NIP proposes HMAC Key Derivation Function (HKDF) coupled with SHA-256 from ECDSA signatures (EIP-191) as an alternative to the Schnorr signatures (BIP-340), allowing Nostr to interact with Ethereum ecosystem.
This specification provides an optional method for Nostr clients to generate deterministic private keys from Ethereum wallet signatures. This NIP proposes HMAC Key Derivation Function (HKDF) coupled with SHA-256 from ECDSA signatures (EIP-191) as an alternative to the Schnorr signatures (BIP-340), allowing Nostr to interact with Ethereum ecosystem, and vice-versa.
## Terminology
### a) Username
@ -36,7 +36,7 @@ let message = `Login to Nostr as ${username}\n\nImportant: Please verify the int
### d) Signature
Signature is the deterministic signature from connected Ethereum wallet. Ethereum signatures `(v,r,s)` are 65 bytes long, i.e. `bytes1(v) + bytes32(r) + bytes32(s)`,
```js
let signature = wallet.signMessage(message);
let signature = wallet.signMessage(message); // implements ethereum-native ECDSA signatures in format (v,r,s)
```
### e) HKDF (HMAC Key Derivation Function)
HKDF-SHA-256 is used to derive the 42 bytes long hash key: `hkdf(sha256, inputKey, salt, info, dkLen = 42)`
@ -58,7 +58,7 @@ HKDF-SHA-256 is used to derive the 42 bytes long hash key: `hkdf(sha256, inputKe
```js
let dkLen = 42;
```
FIPS 186/4 B.4.1 requires hash length to be ≥ n+8, where n is the length of final private key, such that 42 ≥ 32 + 8.
FIPS 186/4 B.4.1 requires hash length to be `>= n + 8`, where n is the length of final private key, such that `42 >= 32 + 8`.
- `hashToPrivateKey` function is FIPS 186-4 B.4.1 implementation to convert hash keys derived using HKDF to valid `secp256k1` private keys. This function is implemented in JavaScript library `@noble/secp256k1` as `hashToPrivateKey()`.
```js