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