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// Copyright 2018 Joyent, Inc.
module.exports = Fingerprint;
var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var algs = require('./algs');
var crypto = require('crypto');
var errs = require('./errors');
var Key = require('./key');
var PrivateKey = require('./private-key');
var Certificate = require('./certificate');
var utils = require('./utils');
var FingerprintFormatError = errs.FingerprintFormatError;
var InvalidAlgorithmError = errs.InvalidAlgorithmError;
function Fingerprint(opts) {
assert.object(opts, 'options');
assert.string(opts.type, 'options.type');
assert.buffer(opts.hash, 'options.hash');
assert.string(opts.algorithm, 'options.algorithm');
this.algorithm = opts.algorithm.toLowerCase();
if (algs.hashAlgs[this.algorithm] !== true)
throw (new InvalidAlgorithmError(this.algorithm));
this.hash = opts.hash;
this.type = opts.type;
this.hashType = opts.hashType;
}
Fingerprint.prototype.toString = function (format) {
if (format === undefined) {
if (this.algorithm === 'md5' || this.hashType === 'spki')
format = 'hex';
else
format = 'base64';
}
assert.string(format);
switch (format) {
case 'hex':
if (this.hashType === 'spki')
return (this.hash.toString('hex'));
return (addColons(this.hash.toString('hex')));
case 'base64':
if (this.hashType === 'spki')
return (this.hash.toString('base64'));
return (sshBase64Format(this.algorithm,
this.hash.toString('base64')));
default:
throw (new FingerprintFormatError(undefined, format));
}
};
Fingerprint.prototype.matches = function (other) {
assert.object(other, 'key or certificate');
if (this.type === 'key' && this.hashType !== 'ssh') {
utils.assertCompatible(other, Key, [1, 7], 'key with spki');
if (PrivateKey.isPrivateKey(other)) {
utils.assertCompatible(other, PrivateKey, [1, 6],
'privatekey with spki support');
}
} else if (this.type === 'key') {
utils.assertCompatible(other, Key, [1, 0], 'key');
} else {
utils.assertCompatible(other, Certificate, [1, 0],
'certificate');
}
var theirHash = other.hash(this.algorithm, this.hashType);
var theirHash2 = crypto.createHash(this.algorithm).
update(theirHash).digest('base64');
if (this.hash2 === undefined)
this.hash2 = crypto.createHash(this.algorithm).
update(this.hash).digest('base64');
return (this.hash2 === theirHash2);
};
/*JSSTYLED*/
var base64RE = /^[A-Za-z0-9+\/=]+$/;
/*JSSTYLED*/
var hexRE = /^[a-fA-F0-9]+$/;
Fingerprint.parse = function (fp, options) {
assert.string(fp, 'fingerprint');
var alg, hash, enAlgs;
if (Array.isArray(options)) {
enAlgs = options;
options = {};
}
assert.optionalObject(options, 'options');
if (options === undefined)
options = {};
if (options.enAlgs !== undefined)
enAlgs = options.enAlgs;
if (options.algorithms !== undefined)
enAlgs = options.algorithms;
assert.optionalArrayOfString(enAlgs, 'algorithms');
var hashType = 'ssh';
if (options.hashType !== undefined)
hashType = options.hashType;
assert.string(hashType, 'options.hashType');
var parts = fp.split(':');
if (parts.length == 2) {
alg = parts[0].toLowerCase();
if (!base64RE.test(parts[1]))
throw (new FingerprintFormatError(fp));
try {
hash = Buffer.from(parts[1], 'base64');
} catch (e) {
throw (new FingerprintFormatError(fp));
}
} else if (parts.length > 2) {
alg = 'md5';
if (parts[0].toLowerCase() === 'md5')
parts = parts.slice(1);
parts = parts.map(function (p) {
while (p.length < 2)
p = '0' + p;
if (p.length > 2)
throw (new FingerprintFormatError(fp));
return (p);
});
parts = parts.join('');
if (!hexRE.test(parts) || parts.length % 2 !== 0)
throw (new FingerprintFormatError(fp));
try {
hash = Buffer.from(parts, 'hex');
} catch (e) {
throw (new FingerprintFormatError(fp));
}
} else {
if (hexRE.test(fp)) {
hash = Buffer.from(fp, 'hex');
} else if (base64RE.test(fp)) {
hash = Buffer.from(fp, 'base64');
} else {
throw (new FingerprintFormatError(fp));
}
switch (hash.length) {
case 32:
alg = 'sha256';
break;
case 16:
alg = 'md5';
break;
case 20:
alg = 'sha1';
break;
case 64:
alg = 'sha512';
break;
default:
throw (new FingerprintFormatError(fp));
}
/* Plain hex/base64: guess it's probably SPKI unless told. */
if (options.hashType === undefined)
hashType = 'spki';
}
if (alg === undefined)
throw (new FingerprintFormatError(fp));
if (algs.hashAlgs[alg] === undefined)
throw (new InvalidAlgorithmError(alg));
if (enAlgs !== undefined) {
enAlgs = enAlgs.map(function (a) { return a.toLowerCase(); });
if (enAlgs.indexOf(alg) === -1)
throw (new InvalidAlgorithmError(alg));
}
return (new Fingerprint({
algorithm: alg,
hash: hash,
type: options.type || 'key',
hashType: hashType
}));
};
function addColons(s) {
/*JSSTYLED*/
return (s.replace(/(.{2})(?=.)/g, '$1:'));
}
function base64Strip(s) {
/*JSSTYLED*/
return (s.replace(/=*$/, ''));
}
function sshBase64Format(alg, h) {
return (alg.toUpperCase() + ':' + base64Strip(h));
}
Fingerprint.isFingerprint = function (obj, ver) {
return (utils.isCompatible(obj, Fingerprint, ver));
};
/*
* API versions for Fingerprint:
* [1,0] -- initial ver
* [1,1] -- first tagged ver
* [1,2] -- hashType and spki support
*/
Fingerprint.prototype._sshpkApiVersion = [1, 2];
Fingerprint._oldVersionDetect = function (obj) {
assert.func(obj.toString);
assert.func(obj.matches);
return ([1, 0]);
};
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