2015-12-09 04:35:05 +01:00
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angular
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.module('bit.services')
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.factory('cryptoService', function ($sessionStorage) {
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var _service = {},
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_key,
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2017-02-21 04:21:14 +01:00
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_b64Key,
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2017-02-28 06:18:11 +01:00
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_privateKey,
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2017-03-07 05:54:06 +01:00
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_publicKey,
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_orgKeys;
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2015-12-09 04:35:05 +01:00
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_service.setKey = function (key) {
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_key = key;
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2017-02-11 19:03:48 +01:00
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$sessionStorage.key = forge.util.encode64(key);
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2015-12-09 04:35:05 +01:00
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};
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2017-02-21 06:29:15 +01:00
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_service.setPrivateKey = function (privateKeyCt, key) {
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try {
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2017-03-10 02:59:10 +01:00
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var privateKeyBytes = _service.decrypt(privateKeyCt, key, 'raw');
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$sessionStorage.privateKey = forge.util.encode64(privateKeyBytes);
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2017-03-22 04:07:38 +01:00
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_privateKey = forge.pki.privateKeyFromAsn1(forge.asn1.fromDer(privateKeyBytes));
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2017-02-21 06:29:15 +01:00
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}
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catch (e) {
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console.log('Cannot set private key. Decryption failed.');
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}
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2017-02-21 04:21:14 +01:00
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};
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2017-03-07 05:54:06 +01:00
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_service.setOrgKeys = function (orgKeysCt, privateKey) {
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2017-03-28 04:22:56 +02:00
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if (!orgKeysCt || Object.keys(orgKeysCt).length === 0) {
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2017-03-07 05:54:06 +01:00
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return;
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}
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var orgKeysb64 = {},
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2017-03-14 03:54:57 +01:00
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_orgKeys = {},
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setKey = false;
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2017-03-28 03:55:39 +02:00
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for (var orgId in orgKeysCt) {
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if (orgKeysCt.hasOwnProperty(orgId)) {
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try {
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var orgKey = _service.rsaDecrypt(orgKeysCt[orgId].key, privateKey);
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_orgKeys[orgId] = orgKey;
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orgKeysb64[orgId] = forge.util.encode64(orgKey);
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setKey = true;
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}
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catch (e) {
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console.log('Cannot set org key ' + i + '. Decryption failed.');
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}
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2017-03-07 05:54:06 +01:00
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}
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}
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2017-03-14 03:54:57 +01:00
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if (setKey) {
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$sessionStorage.orgKeys = orgKeysb64;
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}
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else {
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_orgKeys = null;
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}
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2017-03-12 02:46:33 +01:00
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};
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2017-03-26 03:52:27 +02:00
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_service.addOrgKey = function (orgId, orgKey, privateKey) {
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2017-03-12 02:46:33 +01:00
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_orgKeys = _service.getOrgKeys();
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if (!_orgKeys) {
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_orgKeys = {};
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}
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var orgKeysb64 = $sessionStorage.orgKeys;
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if (!orgKeysb64) {
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orgKeysb64 = {};
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}
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try {
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2017-03-26 03:52:27 +02:00
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var orgKey = _service.rsaDecrypt(orgKey, privateKey);
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_orgKeys[orgId] = orgKey;
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orgKeysb64[orgId] = forge.util.encode64(orgKey);
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2017-03-12 02:46:33 +01:00
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}
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catch (e) {
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2017-03-14 03:54:57 +01:00
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_orgKeys = null;
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2017-03-12 02:46:33 +01:00
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console.log('Cannot set org key. Decryption failed.');
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}
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2017-03-07 05:54:06 +01:00
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$sessionStorage.orgKeys = orgKeysb64;
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};
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2015-12-09 04:35:05 +01:00
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_service.getKey = function (b64) {
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if (b64 && b64 === true && _b64Key) {
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return _b64Key;
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}
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else if (!b64 && _key) {
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return _key;
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}
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if ($sessionStorage.key) {
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2017-02-11 19:03:48 +01:00
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_key = forge.util.decode64($sessionStorage.key);
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2015-12-09 04:35:05 +01:00
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}
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if (b64 && b64 === true) {
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2017-02-11 19:03:48 +01:00
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_b64Key = forge.util.encode64(_key);
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2015-12-09 04:35:05 +01:00
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return _b64Key;
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}
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return _key;
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};
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2016-12-09 04:21:46 +01:00
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_service.getEncKey = function (key) {
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key = key || _service.getKey();
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2017-02-11 19:03:48 +01:00
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var buffer = forge.util.createBuffer(key);
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return buffer.getBytes(16);
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2016-12-09 04:21:46 +01:00
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};
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_service.getMacKey = function (key) {
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key = key || _service.getKey();
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2017-02-11 19:03:48 +01:00
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var buffer = forge.util.createBuffer(key);
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buffer.getBytes(16); // skip first half
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return buffer.getBytes(16);
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2016-12-09 04:21:46 +01:00
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};
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2017-02-21 04:21:14 +01:00
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_service.getPrivateKey = function () {
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if (_privateKey) {
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return _privateKey;
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}
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if ($sessionStorage.privateKey) {
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2017-02-28 06:18:11 +01:00
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var privateKeyBytes = forge.util.decode64($sessionStorage.privateKey);
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_privateKey = forge.pki.privateKeyFromAsn1(forge.asn1.fromDer(privateKeyBytes));
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2017-02-21 04:21:14 +01:00
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}
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return _privateKey;
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};
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2017-02-28 06:18:11 +01:00
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_service.getPublicKey = function () {
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if (_publicKey) {
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return _publicKey;
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}
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var privateKey = _service.getPrivateKey();
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if (!privateKey) {
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return null;
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}
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_publicKey = forge.pki.setRsaPublicKey(privateKey.n, privateKey.e);
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return _publicKey;
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};
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2017-03-07 05:54:06 +01:00
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_service.getOrgKeys = function () {
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if (_orgKeys) {
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return _orgKeys;
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}
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if ($sessionStorage.orgKeys) {
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2017-03-10 04:28:14 +01:00
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var orgKeys = {},
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setKey = false;
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2017-03-07 05:54:06 +01:00
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for (var orgId in $sessionStorage.orgKeys) {
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if ($sessionStorage.orgKeys.hasOwnProperty(orgId)) {
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var orgKeyBytes = forge.util.decode64($sessionStorage.orgKeys[orgId]);
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2017-03-10 04:28:14 +01:00
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orgKeys[orgId] = orgKeyBytes;
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setKey = true;
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2017-03-07 05:54:06 +01:00
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}
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}
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2017-03-10 04:28:14 +01:00
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if (setKey) {
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_orgKeys = orgKeys;
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}
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2017-03-07 05:54:06 +01:00
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}
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return _orgKeys;
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};
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_service.getOrgKey = function (orgId) {
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var orgKeys = _service.getOrgKeys();
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if (!orgKeys || !(orgId in orgKeys)) {
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return null;
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}
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return orgKeys[orgId];
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2017-03-22 04:07:38 +01:00
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};
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2017-03-07 05:54:06 +01:00
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2015-12-09 04:35:05 +01:00
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_service.clearKey = function () {
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2017-02-11 19:03:48 +01:00
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_key = _b64Key = null;
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2015-12-09 04:35:05 +01:00
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delete $sessionStorage.key;
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};
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2017-02-28 06:18:11 +01:00
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_service.clearKeyPair = function () {
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2017-02-21 04:21:14 +01:00
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_privateKey = null;
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2017-02-28 06:18:11 +01:00
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_publicKey = null;
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2017-02-21 04:21:14 +01:00
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delete $sessionStorage.privateKey;
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};
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2017-03-07 05:54:06 +01:00
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_service.clearOrgKeys = function () {
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2017-03-14 03:54:57 +01:00
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_orgKeys = null;
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2017-03-07 05:54:06 +01:00
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delete $sessionStorage.orgKeys;
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};
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2017-02-21 04:21:14 +01:00
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_service.clearKeys = function () {
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_service.clearKey();
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2017-02-28 06:18:11 +01:00
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_service.clearKeyPair();
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2017-03-07 05:54:06 +01:00
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_service.clearOrgKeys();
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2017-02-21 04:21:14 +01:00
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};
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2015-12-09 04:35:05 +01:00
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_service.makeKey = function (password, salt, b64) {
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2017-02-16 01:03:56 +01:00
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var key = forge.pbkdf2(forge.util.encodeUtf8(password), forge.util.encodeUtf8(salt),
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5000, 256 / 8, 'sha256');
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2015-12-09 04:35:05 +01:00
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if (b64 && b64 === true) {
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2017-02-11 19:03:48 +01:00
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return forge.util.encode64(key);
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2015-12-09 04:35:05 +01:00
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}
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return key;
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};
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2017-02-21 05:59:12 +01:00
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_service.makeKeyPair = function (key, callback) {
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2017-02-21 04:21:14 +01:00
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forge.pki.rsa.generateKeyPair({ bits: 2048, workers: 2 }, function (error, keypair) {
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if (error) {
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callback(null, null, error);
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return;
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}
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2017-03-11 02:49:50 +01:00
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var privateKeyAsn1 = forge.pki.privateKeyToAsn1(keypair.privateKey);
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var privateKeyPkcs8 = forge.pki.wrapRsaPrivateKey(privateKeyAsn1);
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var privateKeyBytes = forge.asn1.toDer(privateKeyPkcs8).getBytes();
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var privateKeyEncBytes = _service.encrypt(privateKeyBytes, key, 'raw');
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2017-02-21 04:21:14 +01:00
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2017-03-11 02:49:50 +01:00
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var publicKeyAsn1 = forge.pki.publicKeyToAsn1(keypair.publicKey);
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var publicKeyBytes = forge.asn1.toDer(publicKeyAsn1).getBytes();
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2017-02-21 04:21:14 +01:00
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2017-03-11 02:49:50 +01:00
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callback(forge.util.encode64(publicKeyBytes), privateKeyEncBytes, null);
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2017-02-21 04:21:14 +01:00
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});
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};
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2017-02-28 06:18:11 +01:00
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_service.makeShareKey = function () {
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2017-03-03 06:07:31 +01:00
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return _service.rsaEncrypt(forge.random.getBytesSync(32));
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2017-02-28 06:18:11 +01:00
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};
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2015-12-09 04:35:05 +01:00
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_service.hashPassword = function (password, key) {
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if (!key) {
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key = _service.getKey();
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}
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if (!password || !key) {
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throw 'Invalid parameters.';
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}
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2017-02-16 01:03:56 +01:00
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var hashBits = forge.pbkdf2(key, forge.util.encodeUtf8(password), 1, 256 / 8, 'sha256');
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2017-02-11 19:03:48 +01:00
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return forge.util.encode64(hashBits);
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2016-12-09 04:21:46 +01:00
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};
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2017-02-21 06:29:15 +01:00
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_service.encrypt = function (plainValue, key, plainValueEncoding) {
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2015-12-09 04:35:05 +01:00
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if (!_service.getKey() && !key) {
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throw 'Encryption key unavailable.';
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}
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2016-12-09 04:21:46 +01:00
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// TODO: Turn on whenever ready to support encrypt-then-mac
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var encKey = null;
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if (false) {
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encKey = _service.getEncKey(key);
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}
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else {
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encKey = key || _service.getKey();
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2015-12-09 04:35:05 +01:00
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}
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2017-02-21 06:29:15 +01:00
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plainValueEncoding = plainValueEncoding || 'utf8';
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var buffer = forge.util.createBuffer(plainValue, plainValueEncoding);
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2017-02-11 19:03:48 +01:00
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var ivBytes = forge.random.getBytesSync(16);
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var cipher = forge.cipher.createCipher('AES-CBC', encKey);
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cipher.start({ iv: ivBytes });
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cipher.update(buffer);
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cipher.finish();
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2015-12-09 04:35:05 +01:00
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2017-02-11 19:03:48 +01:00
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var iv = forge.util.encode64(ivBytes);
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var ctBytes = cipher.output.getBytes();
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var ct = forge.util.encode64(ctBytes);
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2016-12-09 04:21:46 +01:00
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var cipherString = iv + '|' + ct;
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// TODO: Turn on whenever ready to support encrypt-then-mac
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if (false) {
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2017-02-11 19:03:48 +01:00
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var mac = computeMac(ctBytes, ivBytes);
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2016-12-09 04:21:46 +01:00
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cipherString = cipherString + '|' + mac;
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}
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return cipherString;
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2015-12-09 04:35:05 +01:00
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};
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2017-02-28 06:18:11 +01:00
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_service.rsaEncrypt = function (plainValue, publicKey) {
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publicKey = publicKey || _service.getPublicKey();
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if (!publicKey) {
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throw 'Public key unavailable.';
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}
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2017-03-05 02:41:45 +01:00
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if (typeof publicKey === 'string') {
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var publicKeyBytes = forge.util.decode64(publicKey);
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publicKey = forge.pki.publicKeyFromAsn1(forge.asn1.fromDer(publicKeyBytes));
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}
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2017-02-28 06:18:11 +01:00
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var encryptedBytes = publicKey.encrypt(plainValue, 'RSA-OAEP', {
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md: forge.md.sha256.create()
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});
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return forge.util.encode64(encryptedBytes);
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2017-03-01 04:53:19 +01:00
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};
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2017-02-28 06:18:11 +01:00
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2017-02-21 06:29:15 +01:00
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_service.decrypt = function (encValue, key, outputEncoding) {
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if (!_service.getKey() && !key) {
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throw 'Encryption key unavailable.';
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2015-12-09 04:35:05 +01:00
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}
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var encPieces = encValue.split('|');
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2016-12-09 04:21:46 +01:00
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if (encPieces.length !== 2 && encPieces.length !== 3) {
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2015-12-09 04:35:05 +01:00
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return '';
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}
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2017-02-11 19:03:48 +01:00
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var ivBytes = forge.util.decode64(encPieces[0]);
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var ctBytes = forge.util.decode64(encPieces[1]);
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2015-12-09 04:35:05 +01:00
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2016-12-09 04:21:46 +01:00
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var computedMac = null;
|
|
|
|
if (encPieces.length === 3) {
|
2017-02-11 19:03:48 +01:00
|
|
|
computedMac = computeMac(ctBytes, ivBytes);
|
2016-12-09 04:21:46 +01:00
|
|
|
if (computedMac !== encPieces[2]) {
|
|
|
|
console.error('MAC failed.');
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-02-21 06:29:15 +01:00
|
|
|
var encKey;
|
|
|
|
if (computedMac) {
|
|
|
|
encKey = _service.getEncKey(key);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
encKey = key || _service.getKey();
|
|
|
|
}
|
|
|
|
|
2017-02-11 19:03:48 +01:00
|
|
|
var ctBuffer = forge.util.createBuffer(ctBytes);
|
2017-02-21 06:29:15 +01:00
|
|
|
var decipher = forge.cipher.createDecipher('AES-CBC', encKey);
|
2017-02-11 19:03:48 +01:00
|
|
|
decipher.start({ iv: ivBytes });
|
|
|
|
decipher.update(ctBuffer);
|
|
|
|
decipher.finish();
|
2015-12-09 04:35:05 +01:00
|
|
|
|
2017-02-21 04:21:14 +01:00
|
|
|
outputEncoding = outputEncoding || 'utf8';
|
|
|
|
if (outputEncoding === 'utf8') {
|
|
|
|
return decipher.output.toString('utf8');
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return decipher.output.getBytes();
|
|
|
|
}
|
2017-02-11 19:03:48 +01:00
|
|
|
};
|
2016-12-09 04:21:46 +01:00
|
|
|
|
2017-02-28 06:18:11 +01:00
|
|
|
_service.rsaDecrypt = function (encValue, privateKey) {
|
|
|
|
privateKey = privateKey || _service.getPrivateKey();
|
|
|
|
if (!privateKey) {
|
|
|
|
throw 'Private key unavailable.';
|
|
|
|
}
|
|
|
|
|
|
|
|
var ctBytes = forge.util.decode64(encValue);
|
|
|
|
var decBytes = privateKey.decrypt(ctBytes, 'RSA-OAEP', {
|
|
|
|
md: forge.md.sha256.create()
|
|
|
|
});
|
|
|
|
|
|
|
|
return decBytes;
|
2017-03-01 04:53:19 +01:00
|
|
|
};
|
2017-02-28 06:18:11 +01:00
|
|
|
|
2017-02-11 19:03:48 +01:00
|
|
|
function computeMac(ct, iv, macKey) {
|
|
|
|
var hmac = forge.hmac.create();
|
|
|
|
hmac.start('sha256', macKey || _service.getMacKey());
|
|
|
|
hmac.update(iv + ct);
|
|
|
|
var mac = hmac.digest();
|
|
|
|
return forge.util.encode64(mac.getBytes());
|
2016-12-09 04:21:46 +01:00
|
|
|
}
|
|
|
|
|
2015-12-09 04:35:05 +01:00
|
|
|
return _service;
|
|
|
|
});
|