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ECDSA recovery public key example #204

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ECDSA recovery public key example #204

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14 changes: 13 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ var ec = new EC('secp256k1');
// Generate keys
var key = ec.genKeyPair();

// Sign the message's hash (input must be an array, or a hex-string)
// Sign the message's hash (input must be a byte array, or a hex-string)
var msgHash = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
var signature = key.sign(msgHash);

Expand Down Expand Up @@ -95,6 +95,18 @@ var signature = { r: 'b1fc...', s: '9c42...' }; // case 3

// Verify signature
console.log(key.verify(msgHash, signature));

// Recover public key from signature
const BN = require("bn.js")

function hexToDec(hex) {
return new BN(hex, 16).toString(10)
}

var recoveryId = ec.getKeyRecoveryParam(msgHash, signature, key.getPublic());

// msgHash must be decimal number
var recoveredPubKey = ec.recoverPubKey(hexToDec(msgHash), signature, recoveryId);
```

### EdDSA
Expand Down