// This module provides the signing functionality used by the DigitalBits network
// The code below may look a little strange... this is because we try to provide
// the most efficient signing method possible. First, we try to load the
// native ed25519 package for node.js environments, and if that fails we
// fallback to tweetnacl.js
var actualMethods = {};
/**
* Use this flag to check if fast signing (provided by `ed25519` package) is available.
* If your app is signing a large number of transaction or verifying a large number
* of signatures make sure `ed25519` package is installed.
*/
export const FastSigning = checkFastSigning();
export function sign(data, secretKey) {
return actualMethods.sign(data, secretKey);
}
export function verify(data, signature, publicKey) {
return actualMethods.verify(data, signature, publicKey);
}
function checkFastSigning() {
var ed25519Used;
// if in node
if (typeof window === 'undefined') {
// NOTE: we use commonjs style require here because es6 imports
// can only occur at the top level. thanks, obama.
let ed25519;
try {
ed25519 = require("ed25519");
ed25519Used = true;
} catch (err) {
ed25519Used = false;
}
if (ed25519Used) {
actualMethods.sign = function(data, secretKey) {
data = new Buffer(data);
return ed25519.Sign(data, secretKey);
};
actualMethods.verify = function(data, signature, publicKey) {
data = new Buffer(data);
try {
return ed25519.Verify(data, signature, publicKey);
} catch(e) {
return false;
}
};
}
} else {
ed25519Used = false;
}
if (!ed25519Used) {
// fallback to tweetnacl.js if we're in the browser or
// if there was a failure installing ed25519
let nacl = require("tweetnacl");
actualMethods.sign = function(data, secretKey) {
data = new Buffer(data);
data = new Uint8Array(data.toJSON().data);
secretKey = new Uint8Array(secretKey.toJSON().data);
let signature = nacl.sign.detached(data, secretKey);
return new Buffer(signature);
};
actualMethods.verify = function(data, signature, publicKey) {
data = new Buffer(data);
data = new Uint8Array(data.toJSON().data);
signature = new Uint8Array(signature.toJSON().data);
publicKey = new Uint8Array(publicKey.toJSON().data);
return nacl.sign.detached.verify(data, signature, publicKey);
};
}
return ed25519Used;
}