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'use strict';
var asn1 = require('./asn1');
var aesid = require('./aesid.json');
var fixProc = require('./fixProc');
var ciphers = require('browserify-aes');
var pbkdf2Sync = require('pbkdf2').pbkdf2Sync;
var Buffer = require('safe-buffer').Buffer;
function decrypt(data, password) {
var salt = data.algorithm.decrypt.kde.kdeparams.salt;
var iters = parseInt(data.algorithm.decrypt.kde.kdeparams.iters.toString(), 10);
var algo = aesid[data.algorithm.decrypt.cipher.algo.join('.')];
var iv = data.algorithm.decrypt.cipher.iv;
var cipherText = data.subjectPrivateKey;
var keylen = parseInt(algo.split('-')[1], 10) / 8;
var key = pbkdf2Sync(password, salt, iters, keylen, 'sha1');
var cipher = ciphers.createDecipheriv(algo, key, iv);
var out = [];
out.push(cipher.update(cipherText));
out.push(cipher['final']());
return Buffer.concat(out);
}
function parseKeys(buffer) {
var password;
if (typeof buffer === 'object' && !Buffer.isBuffer(buffer)) {
password = buffer.passphrase;
buffer = buffer.key;
}
if (typeof buffer === 'string') {
buffer = Buffer.from(buffer);
}
var stripped = fixProc(buffer, password);
var type = stripped.tag;
var data = stripped.data;
var subtype, ndata;
switch (type) {
case 'CERTIFICATE':
ndata = asn1.certificate.decode(data, 'der').tbsCertificate.subjectPublicKeyInfo;
// falls through
case 'PUBLIC KEY':
if (!ndata) {
ndata = asn1.PublicKey.decode(data, 'der');
}
subtype = ndata.algorithm.algorithm.join('.');
switch (subtype) {
case '1.2.840.113549.1.1.1':
return asn1.RSAPublicKey.decode(ndata.subjectPublicKey.data, 'der');
case '1.2.840.10045.2.1':
ndata.subjectPrivateKey = ndata.subjectPublicKey;
return {
type: 'ec',
data: ndata
};
case '1.2.840.10040.4.1':
ndata.algorithm.params.pub_key = asn1.DSAparam.decode(ndata.subjectPublicKey.data, 'der');
return {
type: 'dsa',
data: ndata.algorithm.params
};
default: throw new Error('unknown key id ' + subtype);
}
// throw new Error('unknown key type ' + type)
case 'ENCRYPTED PRIVATE KEY':
data = asn1.EncryptedPrivateKey.decode(data, 'der');
data = decrypt(data, password);
// falls through
case 'PRIVATE KEY':
ndata = asn1.PrivateKey.decode(data, 'der');
subtype = ndata.algorithm.algorithm.join('.');
switch (subtype) {
case '1.2.840.113549.1.1.1':
return asn1.RSAPrivateKey.decode(ndata.subjectPrivateKey, 'der');
case '1.2.840.10045.2.1':
return {
curve: ndata.algorithm.curve,
privateKey: asn1.ECPrivateKey.decode(ndata.subjectPrivateKey, 'der').privateKey
};
case '1.2.840.10040.4.1':
ndata.algorithm.params.priv_key = asn1.DSAparam.decode(ndata.subjectPrivateKey, 'der');
return {
type: 'dsa',
params: ndata.algorithm.params
};
default: throw new Error('unknown key id ' + subtype);
}
// throw new Error('unknown key type ' + type)
case 'RSA PUBLIC KEY':
return asn1.RSAPublicKey.decode(data, 'der');
case 'RSA PRIVATE KEY':
return asn1.RSAPrivateKey.decode(data, 'der');
case 'DSA PRIVATE KEY':
return {
type: 'dsa',
params: asn1.DSAPrivateKey.decode(data, 'der')
};
case 'EC PRIVATE KEY':
data = asn1.ECPrivateKey.decode(data, 'der');
return {
curve: data.parameters.value,
privateKey: data.privateKey
};
default: throw new Error('unknown key type ' + type);
}
}
parseKeys.signature = asn1.signature;
module.exports = parseKeys;