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@celo/blind-threshold-bls
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Readme
This library provides wasm bindings for producing and verifying blind threshold signatures
on BLS12-377. This is done by utilizing wasm-pack
and
the underlying Rust library.
You can find details on the functionalities provided per function by inspecting the Typescript types file
Install by running: npm install @celo/blind-threshold-bls
Currently there are 2 examples available. You can run them and inspect the comments in the files by executing:
$ node examples/blind.js
$ node examples/tblind.js
// Simple Example of blinding, signing, unblinding and verifying.
// Import the library
const threshold = require("@celo/blind_threshold_bls")
const crypto = require('crypto')
// Get a message and a secret for the user
const msg = Buffer.from("hello world")
const user_seed = crypto.randomBytes(32)
// Blind the message
const blinded_msg = threshold.blind(msg, user_seed)
const blind_msg = blinded_msg.message
// Generate a keypair for the service
const service_seed = crypto.randomBytes(32)
const keypair = threshold.keygen(service_seed)
const private_key = keypair.privateKey
const public_key = keypair.publicKey
// Sign the user's blinded message with the service's private key
const blind_sig = threshold.sign(private_key, blind_msg)
// User unblinds the signature with this scalar
const unblinded_sig = threshold.unblind(blind_sig, blinded_msg.blindingFactor)
// User verifies the unblinded signature on his unblinded message
// (this throws on error)
threshold.verify(public_key, msg, unblinded_sig)
console.log("Verification successful")
// Example of how threshold signing is expected to be consumed from the JS side
// Import the library
const threshold = require("@celo/blind_threshold_bls")
const crypto = require('crypto')
// Helper
function flattenSigsArray(sigs) {
return Uint8Array.from(sigs.reduce(function(a, b){
return Array.from(a).concat(Array.from(b));
}, []));
}
// Get a message and a secret for the user
const msg = Buffer.from("hello world")
const userSeed = crypto.randomBytes(32)
// Blind the message
const blinded = threshold.blind(msg, userSeed)
const blindedMessage = blinded.message
// Generate the secret shares for a 3-of-4 threshold scheme
const t = 3;
const n = 4;
const keys = threshold.thresholdKeygen(n, t, crypto.randomBytes(32))
const shares = keys.shares
const polynomial = keys.polynomial
// each of these shares proceed to sign teh blinded sig
let sigs = []
for (let i = 0 ; i < keys.numShares(); i++ ) {
const sig = threshold.partialSign(keys.getShare(i), blindedMessage)
sigs.push(sig)
}
// The combiner will verify all the individual partial signatures
for (const sig of sigs) {
threshold.partialVerify(polynomial, blindedMessage, sig)
}
const blindSig = threshold.combine(t, flattenSigsArray(sigs))
// User unblinds the combined threshold signature with his scalar
const sig = threshold.unblind(blindSig, blinded.blindingFactor)
// User verifies the unblinded signautre on his unblinded message
threshold.verify(keys.thresholdPublicKey, msg, sig)
console.log("Verification successful")
FAQs
Unknown package
We found that @celo/blind-threshold-bls demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 17 open source maintainers collaborating on the project.
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