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<h1 class="page-title">Source: key.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* @requires config
* @requires encoding/armor
* @requires enums
* @requires packet
* @module key
*/
var packet = require('./packet'),
enums = require('./enums.js'),
armor = require('./encoding/armor.js'),
config = require('./config');
/**
* @class
* @classdesc Class that represents an OpenPGP key. Must contain a primary key.
* Can contain additional subkeys, signatures, user ids, user attributes.
* @param {module:packet/packetlist} packetlist The packets that form this key
*/
function Key(packetlist) {
if (!(this instanceof Key)) {
return new Key(packetlist);
}
// same data as in packetlist but in structured form
this.primaryKey = null;
this.revocationSignature = null;
this.directSignatures = null;
this.users = null;
this.subKeys = null;
this.packetlist2structure(packetlist);
if (!this.primaryKey || !this.users) {
throw new Error('Invalid key: need at least key and user ID packet');
}
}
/**
* Transforms packetlist to structured key data
* @param {module:packet/packetlist} packetlist The packets that form a key
*/
Key.prototype.packetlist2structure = function(packetlist) {
var user, primaryKeyId, subKey;
for (var i = 0; i < packetlist.length; i++) {
switch (packetlist[i].tag) {
case enums.packet.publicKey:
case enums.packet.secretKey:
this.primaryKey = packetlist[i];
primaryKeyId = this.primaryKey.getKeyId();
break;
case enums.packet.userid:
case enums.packet.userAttribute:
user = new User(packetlist[i]);
if (!this.users) this.users = [];
this.users.push(user);
break;
case enums.packet.publicSubkey:
case enums.packet.secretSubkey:
user = null;
if (!this.subKeys) this.subKeys = [];
subKey = new SubKey(packetlist[i]);
this.subKeys.push(subKey);
break;
case enums.packet.signature:
switch (packetlist[i].signatureType) {
case enums.signature.cert_generic:
case enums.signature.cert_persona:
case enums.signature.cert_casual:
case enums.signature.cert_positive:
if (packetlist[i].issuerKeyId.equals(primaryKeyId)) {
if (!user.selfCertifications) user.selfCertifications = [];
user.selfCertifications.push(packetlist[i]);
} else {
if (!user.otherCertifications) user.otherCertifications = [];
user.otherCertifications.push(packetlist[i]);
}
break;
case enums.signature.cert_revocation:
if (user) {
if (!user.revocationCertifications) user.revocationCertifications = [];
user.revocationCertifications.push(packetlist[i]);
} else {
if (!this.directSignatures) this.directSignatures = [];
this.directSignatures.push(packetlist[i]);
}
break;
case enums.signature.key:
if (!this.directSignatures) this.directSignatures = [];
this.directSignatures.push(packetlist[i]);
break;
case enums.signature.subkey_binding:
subKey.bindingSignature = packetlist[i];
break;
case enums.signature.key_revocation:
this.revocationSignature = packetlist[i];
break;
case enums.signature.subkey_revocation:
subKey.revocationSignature = packetlist[i];
break;
}
break;
}
}
};
/**
* Transforms structured key data to packetlist
* @return {module:packet/packetlist} The packets that form a key
*/
Key.prototype.toPacketlist = function() {
var packetlist = new packet.List();
packetlist.push(this.primaryKey);
packetlist.push(this.revocationSignature);
packetlist.concat(this.directSignatures);
var i;
for (i = 0; i < this.users.length; i++) {
packetlist.concat(this.users[i].toPacketlist());
}
if (this.subKeys) {
for (i = 0; i < this.subKeys.length; i++) {
packetlist.concat(this.subKeys[i].toPacketlist());
}
}
return packetlist;
};
/**
* Returns the primary key packet (secret or public)
* @returns {(module:packet/secret_key|module:packet/public_key|null)}
*/
Key.prototype.getKeyPacket = function() {
return this.primaryKey;
};
/**
* Returns all the private and public subkey packets
* @returns {Array<(module:packet/public_subkey|module:packet/secret_subkey)>}
*/
Key.prototype.getSubkeyPackets = function() {
var subKeys = [];
if (this.subKeys) {
for (var i = 0; i < this.subKeys.length; i++) {
subKeys.push(this.subKeys[i].subKey);
}
}
return subKeys;
};
/**
* Returns all the private and public key and subkey packets
* @returns {Array<(module:packet/public_subkey|module:packet/secret_subkey|module:packet/secret_key|module:packet/public_key)>}
*/
Key.prototype.getAllKeyPackets = function() {
return [this.getKeyPacket()].concat(this.getSubkeyPackets());
};
/**
* Returns key IDs of all key packets
* @returns {Array<module:type/keyid>}
*/
Key.prototype.getKeyIds = function() {
var keyIds = [];
var keys = this.getAllKeyPackets();
for (var i = 0; i < keys.length; i++) {
keyIds.push(keys[i].getKeyId());
}
return keyIds;
};
function findKey(keys, keyIds) {
for (var i = 0; i < keys.length; i++) {
var keyId = keys[i].getKeyId();
for (var j = 0; j < keyIds.length; j++) {
if (keyId.equals(keyIds[j])) {
return keys[i];
}
}
}
return null;
}
/**
* Returns first public key packet for given array of key IDs
* @param {Array<module:type/keyid>} keyIds
* @return {(module:packet/public_subkey|module:packet/public_key|null)}
*/
Key.prototype.getPublicKeyPacket = function(keyIds) {
if (this.primaryKey.tag == enums.packet.publicKey) {
return findKey(this.getAllKeyPackets(), keyIds);
} else {
return null;
}
};
/**
* Returns first private key packet for given array of key IDs
* @param {Array<module:type/keyid>} keyIds
* @return {(module:packet/secret_subkey|module:packet/secret_key|null)}
*/
Key.prototype.getPrivateKeyPacket = function(keyIds) {
if (this.primaryKey.tag == enums.packet.secretKey) {
return findKey(this.getAllKeyPackets(), keyIds);
} else {
return null;
}
};
/**
* Returns userids
* @return {Array<string>} array of userids
*/
Key.prototype.getUserIds = function() {
var userids = [];
for (var i = 0; i < this.users.length; i++) {
if (this.users[i].userId) {
userids.push(this.users[i].userId.write());
}
}
return userids;
};
/**
* Returns true if this is a public key
* @return {Boolean}
*/
Key.prototype.isPublic = function() {
return this.primaryKey.tag == enums.packet.publicKey;
};
/**
* Returns true if this is a private key
* @return {Boolean}
*/
Key.prototype.isPrivate = function() {
return this.primaryKey.tag == enums.packet.secretKey;
};
/**
* Returns key as public key (shallow copy)
* @return {module:key~Key} new public Key
*/
Key.prototype.toPublic = function() {
var packetlist = new packet.List();
var keyPackets = this.toPacketlist();
var bytes;
for (var i = 0; i < keyPackets.length; i++) {
switch (keyPackets[i].tag) {
case enums.packet.secretKey:
bytes = keyPackets[i].writePublicKey();
var pubKeyPacket = new packet.PublicKey();
pubKeyPacket.read(bytes);
packetlist.push(pubKeyPacket);
break;
case enums.packet.secretSubkey:
bytes = keyPackets[i].writePublicKey();
var pubSubkeyPacket = new packet.PublicSubkey();
pubSubkeyPacket.read(bytes);
packetlist.push(pubSubkeyPacket);
break;
default:
packetlist.push(keyPackets[i]);
}
}
return new Key(packetlist);
};
/**
* Returns ASCII armored text of key
* @return {String} ASCII armor
*/
Key.prototype.armor = function() {
var type = this.isPublic() ? enums.armor.public_key : enums.armor.private_key;
return armor.encode(type, this.toPacketlist().write());
};
/**
* Returns first key packet that is available for signing
* @return {(module:packet/secret_subkey|module:packet/secret_key|null)} key packet or null if no signing key has been found
*/
Key.prototype.getSigningKeyPacket = function() {
if (this.isPublic()) {
throw new Error('Need private key for signing');
}
var primaryUser = this.getPrimaryUser();
if (primaryUser &&
isValidSigningKeyPacket(this.primaryKey, primaryUser.selfCertificate)) {
return this.primaryKey;
}
if (this.subKeys) {
for (var i = 0; i < this.subKeys.length; i++) {
if (this.subKeys[i].isValidSigningKey(this.primaryKey)) {
return this.subKeys[i].subKey;
}
}
}
return null;
};
/**
* Returns preferred signature hash algorithm of this key
* @return {String}
*/
Key.prototype.getPreferredHashAlgorithm = function() {
var primaryUser = this.getPrimaryUser();
if (primaryUser && primaryUser.selfCertificate.preferredHashAlgorithms) {
return primaryUser.selfCertificate.preferredHashAlgorithms[0];
}
return config.prefer_hash_algorithm;
};
function isValidEncryptionKeyPacket(keyPacket, signature) {
return keyPacket.algorithm !== enums.read(enums.publicKey, enums.publicKey.dsa) &&
keyPacket.algorithm !== enums.read(enums.publicKey, enums.publicKey.rsa_sign) &&
((signature.keyFlags & enums.keyFlags.encrypt_communication) !== 0 ||
(signature.keyFlags & enums.keyFlags.encrypt_storage) !== 0 ||
!signature.keyFlags);
}
function isValidSigningKeyPacket(keyPacket, signature) {
return (keyPacket.algorithm == enums.read(enums.publicKey, enums.publicKey.dsa) ||
keyPacket.algorithm == enums.read(enums.publicKey, enums.publicKey.rsa_sign) ||
keyPacket.algorithm == enums.read(enums.publicKey, enums.publicKey.rsa_encrypt_sign)) &&
((signature.keyFlags & enums.keyFlags.sign_data) !== 0 ||
!signature.keyFlags);
}
/**
* Returns the first valid encryption key packet for this key
* @returns {(module:packet/public_subkey|module:packet/secret_subkey|module:packet/secret_key|module:packet/public_key|null)} key packet or null if no encryption key has been found
*/
Key.prototype.getEncryptionKeyPacket = function() {
// V4: by convention subkeys are prefered for encryption service
// V3: keys MUST NOT have subkeys
if (this.subKeys) {
for (var i = 0; i < this.subKeys.length; i++) {
if (this.subKeys[i].isValidEncryptionKey(this.primaryKey)) {
return this.subKeys[i].subKey;
}
}
}
// if no valid subkey for encryption, evaluate primary key
var primaryUser = this.getPrimaryUser();
if (primaryUser &&
isValidEncryptionKeyPacket(this.primaryKey, primaryUser.selfCertificate)) {
return this.primaryKey;
}
return null;
};
/**
* Decrypts all secret key and subkey packets
* @param {String} passphrase
* @return {Boolean} true if all key and subkey packets decrypted successfully
*/
Key.prototype.decrypt = function(passphrase) {
if (this.isPrivate()) {
var keys = this.getAllKeyPackets();
for (var i = 0; i < keys.length; i++) {
var success = keys[i].decrypt(passphrase);
if (!success) return false;
}
} else {
throw new Error("Nothing to decrypt in a public key");
}
return true;
};
/**
* Decrypts specific key packets by key ID
* @param {Array<module:type/keyid>} keyIds
* @param {String} passphrase
* @return {Boolean} true if all key packets decrypted successfully
*/
Key.prototype.decryptKeyPacket = function(keyIds, passphrase) {
if (this.isPrivate()) {
var keys = this.getAllKeyPackets();
for (var i = 0; i < keys.length; i++) {
var keyId = keys[i].getKeyId();
for (var j = 0; j < keyIds.length; j++) {
if (keyId.equals(keyIds[j])) {
var success = keys[i].decrypt(passphrase);
if (!success) return false;
}
}
}
} else {
throw new Error("Nothing to decrypt in a public key");
}
return true;
};
/**
* Verify primary key. Checks for revocation signatures, expiration time
* and valid self signature
* @return {module:enums.keyStatus} The status of the primary key
*/
Key.prototype.verifyPrimaryKey = function() {
// check revocation signature
if (this.revocationSignature && !this.revocationSignature.isExpired() &&
(this.revocationSignature.verified ||
this.revocationSignature.verify(this.primaryKey, {key: this.primaryKey}))) {
return enums.keyStatus.revoked;
}
// check V3 expiration time
if (this.primaryKey.version == 3 && this.primaryKey.expirationTimeV3 !== 0 &&
Date.now() > (this.primaryKey.created.getTime() + this.primaryKey.expirationTimeV3*24*3600*1000)) {
return enums.keyStatus.expired;
}
// check for at least one self signature. Self signature of user ID not mandatory
// See {@link http://tools.ietf.org/html/rfc4880#section-11.1}
var selfSigned = false;
for (var i = 0; i < this.users.length; i++) {
if (this.users[i].userId && this.users[i].selfCertifications) {
selfSigned = true;
}
}
if (!selfSigned) {
return enums.keyStatus.no_self_cert;
}
// check for valid self signature
var primaryUser = this.getPrimaryUser();
if (!primaryUser) {
return enums.keyStatus.invalid;
}
// check V4 expiration time
if (this.primaryKey.version == 4 && primaryUser.selfCertificate.keyNeverExpires === false &&
Date.now() > (primaryUser.selfCertificate.created.getTime() + primaryUser.selfCertificate.keyExpirationTime*1000)) {
return enums.keyStatus.expired;
}
return enums.keyStatus.valid;
};
/**
* Returns primary user and most significant (latest valid) self signature
* - if multiple users are marked as primary users returns the one with the latest self signature
* - if no primary user is found returns the user with the latest self signature
* @return {{user: Array<module:packet/User>, selfCertificate: Array<module:packet/signature>}} The primary user and the self signature
*/
Key.prototype.getPrimaryUser = function() {
var user = null;
var userSelfCert;
for (var i = 0; i < this.users.length; i++) {
if (!this.users[i].userId) {
continue;
}
var selfCert = this.users[i].getValidSelfCertificate(this.primaryKey);
if (!selfCert) {
continue;
}
if (!user ||
!userSelfCert.isPrimaryUserID && selfCert.isPrimaryUserID ||
userSelfCert.created < selfCert.created) {
user = this.users[i];
userSelfCert = selfCert;
}
}
return user ? {user: user, selfCertificate: userSelfCert} : null;
};
// TODO
Key.prototype.revoke = function() {
};
/**
* @class
* @classdesc Class that represents an user ID or attribute packet and the relevant signatures.
*/
function User(userPacket) {
if (!(this instanceof User)) {
return new User(userPacket);
}
this.userId = userPacket.tag == enums.packet.userid ? userPacket : null;
this.userAttribute = userPacket.tag == enums.packet.userAttribute ? userPacket : null;
this.selfCertifications = null;
this.otherCertifications = null;
this.revocationCertifications = null;
}
/**
* Transforms structured user data to packetlist
* @return {module:packet/packetlist}
*/
User.prototype.toPacketlist = function() {
var packetlist = new packet.List();
packetlist.push(this.userId || this.userAttribute);
packetlist.concat(this.revocationCertifications);
packetlist.concat(this.selfCertifications);
packetlist.concat(this.otherCertifications);
return packetlist;
};
/**
* Checks if a self signature of the user is revoked
* @param {module:packet/signature} certificate
* @param {module:packet/secret_key|module:packet/public_key} primaryKey The primary key packet
* @return {Boolean} True if the certificate is revoked
*/
User.prototype.isRevoked = function(certificate, primaryKey) {
if (this.revocationCertifications) {
var that = this;
return this.revocationCertifications.some(function(revCert) {
return revCert.issuerKeyId.equals(certificate.issuerKeyId) &&
!revCert.isExpired() &&
(revCert.verified ||
revCert.verify(primaryKey, {userid: that.userId || that.userAttribute, key: primaryKey}));
});
} else {
return false;
}
};
/**
* Returns the most significant (latest valid) self signature of the user
* @param {module:packet/secret_key|module:packet/public_key} primaryKey The primary key packet
* @return {module:packet/signature} The self signature
*/
User.prototype.getValidSelfCertificate = function(primaryKey) {
if (!this.selfCertifications) {
return null;
}
var validCert = [];
for (var i = 0; i < this.selfCertifications.length; i++) {
if (this.isRevoked(this.selfCertifications[i], primaryKey)) {
continue;
}
if (!this.selfCertifications[i].isExpired() &&
(this.selfCertifications[i].verified ||
this.selfCertifications[i].verify(primaryKey, {userid: this.userId || this.userAttribute, key: primaryKey}))) {
validCert.push(this.selfCertifications[i]);
}
}
// most recent first
validCert = validCert.sort(function(a, b) {
a = a.created;
b = b.created;
return a>b ? -1 : a<b ? 1 : 0;
});
return validCert[0];
};
/**
* Verify User. Checks for existence of self signatures, revocation signatures
* and validity of self signature
* @param {module:packet/secret_key|module:packet/public_key} primaryKey The primary key packet
* @return {module:enums.keyStatus} status of user
*/
User.prototype.verify = function(primaryKey) {
if (!this.selfCertifications) {
return enums.keyStatus.no_self_cert;
}
var status;
for (var i = 0; i < this.selfCertifications.length; i++) {
if (this.isRevoked(this.selfCertifications[i], primaryKey)) {
status = enums.keyStatus.revoked;
continue;
}
if (!(this.selfCertifications[i].verified ||
this.selfCertifications[i].verify(primaryKey, {userid: this.userId || this.userAttribute, key: primaryKey}))) {
status = enums.keyStatus.invalid;
continue;
}
if (this.selfCertifications[i].isExpired()) {
status = enums.keyStatus.expired;
continue;
}
status = enums.keyStatus.valid;
break;
}
return status;
};
/**
* @class
* @classdesc Class that represents a subkey packet and the relevant signatures.
*/
function SubKey(subKeyPacket) {
if (!(this instanceof SubKey)) {
return new SubKey(subKeyPacket);
}
this.subKey = subKeyPacket;
this.bindingSignature = null;
this.revocationSignature = null;
}
/**
* Transforms structured subkey data to packetlist
* @return {module:packet/packetlist}
*/
SubKey.prototype.toPacketlist = function() {
var packetlist = new packet.List();
packetlist.push(this.subKey);
packetlist.push(this.revocationSignature);
packetlist.push(this.bindingSignature);
return packetlist;
};
/**
* Returns true if the subkey can be used for encryption
* @param {module:packet/secret_key|module:packet/public_key} primaryKey The primary key packet
* @return {Boolean}
*/
SubKey.prototype.isValidEncryptionKey = function(primaryKey) {
return this.verify(primaryKey) == enums.keyStatus.valid &&
isValidEncryptionKeyPacket(this.subKey, this.bindingSignature);
};
/**
* Returns true if the subkey can be used for signing of data
* @param {module:packet/secret_key|module:packet/public_key} primaryKey The primary key packet
* @return {Boolean}
*/
SubKey.prototype.isValidSigningKey = function(primaryKey) {
return this.verify(primaryKey) == enums.keyStatus.valid &&
isValidSigningKeyPacket(this.subKey, this.bindingSignature);
};
/**
* Verify subkey. Checks for revocation signatures, expiration time
* and valid binding signature
* @return {module:enums.keyStatus} The status of the subkey
*/
SubKey.prototype.verify = function(primaryKey) {
// check subkey revocation signature
if (this.revocationSignature && !this.revocationSignature.isExpired() &&
(this.revocationSignature.verified ||
this.revocationSignature.verify(primaryKey, {key: this.subKey}))) {
return enums.keyStatus.revoked;
}
// check V3 expiration time
if (this.subKey.version == 3 && this.subKey.expirationTimeV3 !== 0 &&
Date.now() > (this.subKey.created.getTime() + this.subKey.expirationTimeV3*24*3600*1000)) {
return enums.keyStatus.expired;
}
// check subkey binding signature
if (!this.bindingSignature) {
return enums.keyStatus.invalid;
}
if (this.bindingSignature.isExpired()) {
return enums.keyStatus.expired;
}
if (!(this.bindingSignature.verified ||
this.bindingSignature.verify(primaryKey, {key: primaryKey, bind: this.subKey}))) {
return enums.keyStatus.invalid;
}
// check V4 expiration time
if (this.subKey.version == 4 &&
this.bindingSignature.keyNeverExpires === false &&
Date.now() > (this.subKey.created.getTime() + this.bindingSignature.keyExpirationTime*1000)) {
return enums.keyStatus.expired;
}
return enums.keyStatus.valid;
};
/**
* Reads an OpenPGP armored text and returns one or multiple key objects
* @param {String} armoredText text to be parsed
* @return {{keys: Array<module:key~Key>, err: (Array<Error>|null)}} result object with key and error arrays
* @static
*/
function readArmored(armoredText) {
var result = {};
result.keys = [];
try {
var input = armor.decode(armoredText);
if (!(input.type == enums.armor.public_key || input.type == enums.armor.private_key)) {
throw new Error('Armored text not of type key');
}
var packetlist = new packet.List();
packetlist.read(input.data);
var keyIndex = packetlist.indexOfTag(enums.packet.publicKey, enums.packet.secretKey);
if (keyIndex.length === 0) {
throw new Error('No key packet found in armored text');
}
for (var i = 0; i < keyIndex.length; i++) {
var oneKeyList = packetlist.slice(keyIndex[i], keyIndex[i + 1]);
try {
var newKey = new Key(oneKeyList);
result.keys.push(newKey);
} catch (e) {
result.err = result.err || [];
result.err.push(e);
}
}
} catch (e) {
result.err = result.err || [];
result.err.push(e);
}
return result;
}
/**
* Generates a new OpenPGP key. Currently only supports RSA keys.
* Primary and subkey will be of same type.
* @param {module:enums.publicKey} keyType to indicate what type of key to make.
* RSA is 1. See {@link http://tools.ietf.org/html/rfc4880#section-9.1}
* @param {Integer} numBits number of bits for the key creation.
* @param {String} userId assumes already in form of "User Name <username@email.com>"
* @param {String} passphrase The passphrase used to encrypt the resulting private key
* @return {module:key~Key}
* @static
*/
function generate(keyType, numBits, userId, passphrase) {
var packetlist = new packet.List();
var secretKeyPacket = new packet.SecretKey();
secretKeyPacket.algorithm = enums.read(enums.publicKey, keyType);
secretKeyPacket.generate(numBits);
secretKeyPacket.encrypt(passphrase);
var userIdPacket = new packet.Userid();
userIdPacket.read(userId);
var dataToSign = {};
dataToSign.userid = userIdPacket;
dataToSign.key = secretKeyPacket;
var signaturePacket = new packet.Signature();
signaturePacket.signatureType = enums.signature.cert_generic;
signaturePacket.publicKeyAlgorithm = keyType;
//TODO we should load preferred hash from config, or as input to this function
signaturePacket.hashAlgorithm = enums.hash.sha256;
signaturePacket.keyFlags = [enums.keyFlags.certify_keys | enums.keyFlags.sign_data];
signaturePacket.sign(secretKeyPacket, dataToSign);
var secretSubkeyPacket = new packet.SecretSubkey();
secretSubkeyPacket.algorithm = enums.read(enums.publicKey, keyType);
secretSubkeyPacket.generate(numBits);
secretSubkeyPacket.encrypt(passphrase);
dataToSign = {};
dataToSign.key = secretKeyPacket;
dataToSign.bind = secretSubkeyPacket;
var subkeySignaturePacket = new packet.Signature();
subkeySignaturePacket.signatureType = enums.signature.subkey_binding;
subkeySignaturePacket.publicKeyAlgorithm = keyType;
//TODO we should load preferred hash from config, or as input to this function
subkeySignaturePacket.hashAlgorithm = enums.hash.sha256;
subkeySignaturePacket.keyFlags = [enums.keyFlags.encrypt_communication | enums.keyFlags.encrypt_storage];
subkeySignaturePacket.sign(secretKeyPacket, dataToSign);
packetlist.push(secretKeyPacket);
packetlist.push(userIdPacket);
packetlist.push(signaturePacket);
packetlist.push(secretSubkeyPacket);
packetlist.push(subkeySignaturePacket);
return new Key(packetlist);
}
exports.Key = Key;
exports.readArmored = readArmored;
exports.generate = generate;
</code></pre>
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