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minor stuff

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sshmatrix 2023-02-19 13:27:46 +05:30
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@ -49,6 +49,7 @@ HKDF-SHA-256 is used to derive the 42 bytes long hash key: `hkdf(sha256, inputKe
let salt = await sha256(`eip155:${chainId}:${username}:${password?password:""}:${signature.slice(68)}`); let salt = await sha256(`eip155:${chainId}:${username}:${password?password:""}:${signature.slice(68)}`);
``` ```
where, `signature.slice(68)` is hex `s` value of Ethereum signature, i.e. the last 32 bytes. where, `signature.slice(68)` is hex `s` value of Ethereum signature, i.e. the last 32 bytes.
- `Info` is a string with the following format: - `Info` is a string with the following format:
```js ```js
let info = `eip155:${chainId}:${username}:${address}`; let info = `eip155:${chainId}:${username}:${address}`;
@ -57,7 +58,8 @@ HKDF-SHA-256 is used to derive the 42 bytes long hash key: `hkdf(sha256, inputKe
```js ```js
let dkLen = 42; 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()`. - `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 ```js
let hashKey = hkdf(sha256, inputKey, salt, info, dkLen=42); let hashKey = hkdf(sha256, inputKey, salt, info, dkLen=42);