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chainsafe-bls/src/index.ts

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import {Keypair} from "./keypair";
import {PrivateKey} from "./privateKey";
import {PublicKey} from "./publicKey";
import {Signature} from "./signature";
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import {BLSPubkey, BLSSecretKey, BLSSignature, Domain, Hash} from "@chainsafe/eth2.0-types";
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import {PUBLIC_KEY_LENGTH} from "./constants";
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export {Keypair, PrivateKey, PublicKey, Signature};
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export {init as initBLS} from "./context";
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/**
* Generates new secret and public key
*/
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export function generateKeyPair(): Keypair {
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return Keypair.generate();
}
/**
* Generates public key from given secret.
* @param {BLSSecretKey} secretKey
*/
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export function generatePublicKey(secretKey: BLSSecretKey): BLSPubkey {
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const keypair = new Keypair(PrivateKey.fromBytes(secretKey));
return keypair.publicKey.toBytesCompressed();
}
/**
* Signs given message using secret key.
* @param secretKey
* @param messageHash
* @param domain
*/
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export function sign(secretKey: BLSSecretKey, messageHash: Hash, domain: Domain): BLSSignature {
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const privateKey = PrivateKey.fromBytes(secretKey);
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return privateKey.signMessage(messageHash, domain).toBytesCompressed();
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}
/**
* Compines all given signature into one.
* @param signatures
*/
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export function aggregateSignatures(signatures: BLSSignature[]): BLSSignature {
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return signatures.map((signature): Signature => {
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return Signature.fromCompressedBytes(signature);
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}).reduce((previousValue, currentValue): Signature => {
return previousValue.add(currentValue);
}).toBytesCompressed();
}
/**
* Combines all given public keys into single one
* @param publicKeys
*/
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export function aggregatePubkeys(publicKeys: BLSPubkey[]): BLSPubkey {
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if(publicKeys.length === 0) {
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return Buffer.alloc(PUBLIC_KEY_LENGTH);
}
return publicKeys.map(PublicKey.fromBytes).reduce((agg, pubKey) => {
if(agg) {
return agg.add(pubKey);
} else {
return pubKey;
}
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}
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).toBytesCompressed();
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}
/**
* Verifies if signature is message signed with given public key.
* @param publicKey
* @param messageHash
* @param signature
* @param domain
*/
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export function verify(publicKey: BLSPubkey, messageHash: Hash, signature: BLSSignature, domain: Domain): boolean {
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try {
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return PublicKey
.fromBytes(publicKey)
.verifyMessage(Signature.fromCompressedBytes(signature), messageHash, domain);
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} catch (e) {
return false;
}
}
/**
* Verifies if signature is list of message signed with corresponding public key.
* @param publicKeys
* @param messageHashes
* @param signature
* @param domain
*/
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export function verifyMultiple(
publicKeys: BLSPubkey[],
messageHashes: Hash[],
signature: BLSSignature,
domain: Domain
): boolean {
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if(publicKeys.length === 0 || publicKeys.length != messageHashes.length) {
return false;
}
try {
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return Signature
.fromCompressedBytes(signature)
.verifyMultiple(
publicKeys.map((key) => PublicKey.fromBytes(key)),
messageHashes,
domain
);
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} catch (e) {
return false;
}
}
export default {
generateKeyPair,
generatePublicKey,
sign,
aggregateSignatures,
aggregatePubkeys,
verify,
verifyMultiple
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};