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// Copyright 2015 Joyent, Inc.
module.exports = {
Verifier: Verifier,
Signer: Signer
};
var nacl = require('tweetnacl');
var stream = require('stream');
var util = require('util');
var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var Signature = require('./signature');
function Verifier(key, hashAlgo) {
if (hashAlgo.toLowerCase() !== 'sha512')
throw (new Error('ED25519 only supports the use of ' +
'SHA-512 hashes'));
this.key = key;
this.chunks = [];
stream.Writable.call(this, {});
}
util.inherits(Verifier, stream.Writable);
Verifier.prototype._write = function (chunk, enc, cb) {
this.chunks.push(chunk);
cb();
};
Verifier.prototype.update = function (chunk) {
if (typeof (chunk) === 'string')
chunk = Buffer.from(chunk, 'binary');
this.chunks.push(chunk);
};
Verifier.prototype.verify = function (signature, fmt) {
var sig;
if (Signature.isSignature(signature, [2, 0])) {
if (signature.type !== 'ed25519')
return (false);
sig = signature.toBuffer('raw');
} else if (typeof (signature) === 'string') {
sig = Buffer.from(signature, 'base64');
} else if (Signature.isSignature(signature, [1, 0])) {
throw (new Error('signature was created by too old ' +
'a version of sshpk and cannot be verified'));
}
assert.buffer(sig);
return (nacl.sign.detached.verify(
new Uint8Array(Buffer.concat(this.chunks)),
new Uint8Array(sig),
new Uint8Array(this.key.part.A.data)));
};
function Signer(key, hashAlgo) {
if (hashAlgo.toLowerCase() !== 'sha512')
throw (new Error('ED25519 only supports the use of ' +
'SHA-512 hashes'));
this.key = key;
this.chunks = [];
stream.Writable.call(this, {});
}
util.inherits(Signer, stream.Writable);
Signer.prototype._write = function (chunk, enc, cb) {
this.chunks.push(chunk);
cb();
};
Signer.prototype.update = function (chunk) {
if (typeof (chunk) === 'string')
chunk = Buffer.from(chunk, 'binary');
this.chunks.push(chunk);
};
Signer.prototype.sign = function () {
var sig = nacl.sign.detached(
new Uint8Array(Buffer.concat(this.chunks)),
new Uint8Array(Buffer.concat([
this.key.part.k.data, this.key.part.A.data])));
var sigBuf = Buffer.from(sig);
var sigObj = Signature.parse(sigBuf, 'ed25519', 'raw');
sigObj.hashAlgorithm = 'sha512';
return (sigObj);
};
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