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92 lines
2.3 KiB
92 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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