mirror of
https://github.com/titanscouting/tra-analysis.git
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1244 lines
38 KiB
JavaScript
1244 lines
38 KiB
JavaScript
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/**
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* Javascript implementation of PKCS#7 v1.5.
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*
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* @author Stefan Siegl
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* @author Dave Longley
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*
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* Copyright (c) 2012 Stefan Siegl <stesie@brokenpipe.de>
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* Copyright (c) 2012-2015 Digital Bazaar, Inc.
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*
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* Currently this implementation only supports ContentType of EnvelopedData,
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* EncryptedData, or SignedData at the root level. The top level elements may
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* contain only a ContentInfo of ContentType Data, i.e. plain data. Further
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* nesting is not (yet) supported.
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*
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* The Forge validators for PKCS #7's ASN.1 structures are available from
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* a separate file pkcs7asn1.js, since those are referenced from other
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* PKCS standards like PKCS #12.
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*/
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var forge = require('./forge');
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require('./aes');
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require('./asn1');
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require('./des');
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require('./oids');
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require('./pem');
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require('./pkcs7asn1');
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require('./random');
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require('./util');
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require('./x509');
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// shortcut for ASN.1 API
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var asn1 = forge.asn1;
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// shortcut for PKCS#7 API
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var p7 = module.exports = forge.pkcs7 = forge.pkcs7 || {};
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/**
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* Converts a PKCS#7 message from PEM format.
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*
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* @param pem the PEM-formatted PKCS#7 message.
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*
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* @return the PKCS#7 message.
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*/
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p7.messageFromPem = function(pem) {
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var msg = forge.pem.decode(pem)[0];
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if(msg.type !== 'PKCS7') {
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var error = new Error('Could not convert PKCS#7 message from PEM; PEM ' +
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'header type is not "PKCS#7".');
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error.headerType = msg.type;
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throw error;
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}
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if(msg.procType && msg.procType.type === 'ENCRYPTED') {
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throw new Error('Could not convert PKCS#7 message from PEM; PEM is encrypted.');
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}
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// convert DER to ASN.1 object
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var obj = asn1.fromDer(msg.body);
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return p7.messageFromAsn1(obj);
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};
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/**
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* Converts a PKCS#7 message to PEM format.
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*
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* @param msg The PKCS#7 message object
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* @param maxline The maximum characters per line, defaults to 64.
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*
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* @return The PEM-formatted PKCS#7 message.
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*/
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p7.messageToPem = function(msg, maxline) {
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// convert to ASN.1, then DER, then PEM-encode
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var pemObj = {
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type: 'PKCS7',
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body: asn1.toDer(msg.toAsn1()).getBytes()
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};
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return forge.pem.encode(pemObj, {maxline: maxline});
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};
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/**
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* Converts a PKCS#7 message from an ASN.1 object.
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*
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* @param obj the ASN.1 representation of a ContentInfo.
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*
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* @return the PKCS#7 message.
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*/
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p7.messageFromAsn1 = function(obj) {
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// validate root level ContentInfo and capture data
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var capture = {};
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var errors = [];
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if(!asn1.validate(obj, p7.asn1.contentInfoValidator, capture, errors)) {
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var error = new Error('Cannot read PKCS#7 message. ' +
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'ASN.1 object is not an PKCS#7 ContentInfo.');
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error.errors = errors;
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throw error;
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}
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var contentType = asn1.derToOid(capture.contentType);
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var msg;
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switch(contentType) {
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case forge.pki.oids.envelopedData:
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msg = p7.createEnvelopedData();
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break;
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case forge.pki.oids.encryptedData:
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msg = p7.createEncryptedData();
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break;
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case forge.pki.oids.signedData:
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msg = p7.createSignedData();
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break;
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default:
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throw new Error('Cannot read PKCS#7 message. ContentType with OID ' +
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contentType + ' is not (yet) supported.');
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}
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msg.fromAsn1(capture.content.value[0]);
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return msg;
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};
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p7.createSignedData = function() {
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var msg = null;
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msg = {
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type: forge.pki.oids.signedData,
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version: 1,
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certificates: [],
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crls: [],
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// TODO: add json-formatted signer stuff here?
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signers: [],
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// populated during sign()
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digestAlgorithmIdentifiers: [],
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contentInfo: null,
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signerInfos: [],
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fromAsn1: function(obj) {
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// validate SignedData content block and capture data.
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_fromAsn1(msg, obj, p7.asn1.signedDataValidator);
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msg.certificates = [];
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msg.crls = [];
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msg.digestAlgorithmIdentifiers = [];
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msg.contentInfo = null;
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msg.signerInfos = [];
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if(msg.rawCapture.certificates) {
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var certs = msg.rawCapture.certificates.value;
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for(var i = 0; i < certs.length; ++i) {
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msg.certificates.push(forge.pki.certificateFromAsn1(certs[i]));
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}
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}
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// TODO: parse crls
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},
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toAsn1: function() {
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// degenerate case with no content
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if(!msg.contentInfo) {
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msg.sign();
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}
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var certs = [];
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for(var i = 0; i < msg.certificates.length; ++i) {
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certs.push(forge.pki.certificateToAsn1(msg.certificates[i]));
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}
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var crls = [];
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// TODO: implement CRLs
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// [0] SignedData
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var signedData = asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, [
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
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// Version
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
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asn1.integerToDer(msg.version).getBytes()),
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// DigestAlgorithmIdentifiers
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asn1.create(
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asn1.Class.UNIVERSAL, asn1.Type.SET, true,
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msg.digestAlgorithmIdentifiers),
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// ContentInfo
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msg.contentInfo
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])
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]);
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if(certs.length > 0) {
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// [0] IMPLICIT ExtendedCertificatesAndCertificates OPTIONAL
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signedData.value[0].value.push(
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asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, certs));
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}
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if(crls.length > 0) {
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// [1] IMPLICIT CertificateRevocationLists OPTIONAL
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signedData.value[0].value.push(
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asn1.create(asn1.Class.CONTEXT_SPECIFIC, 1, true, crls));
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}
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// SignerInfos
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signedData.value[0].value.push(
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SET, true,
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msg.signerInfos));
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// ContentInfo
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return asn1.create(
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asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
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// ContentType
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
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asn1.oidToDer(msg.type).getBytes()),
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// [0] SignedData
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signedData
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]);
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},
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/**
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* Add (another) entity to list of signers.
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*
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* Note: If authenticatedAttributes are provided, then, per RFC 2315,
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* they must include at least two attributes: content type and
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* message digest. The message digest attribute value will be
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* auto-calculated during signing and will be ignored if provided.
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*
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* Here's an example of providing these two attributes:
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*
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* forge.pkcs7.createSignedData();
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* p7.addSigner({
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* issuer: cert.issuer.attributes,
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* serialNumber: cert.serialNumber,
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* key: privateKey,
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* digestAlgorithm: forge.pki.oids.sha1,
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* authenticatedAttributes: [{
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* type: forge.pki.oids.contentType,
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* value: forge.pki.oids.data
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* }, {
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* type: forge.pki.oids.messageDigest
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* }]
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* });
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*
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* TODO: Support [subjectKeyIdentifier] as signer's ID.
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*
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* @param signer the signer information:
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* key the signer's private key.
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* [certificate] a certificate containing the public key
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* associated with the signer's private key; use this option as
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* an alternative to specifying signer.issuer and
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* signer.serialNumber.
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* [issuer] the issuer attributes (eg: cert.issuer.attributes).
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* [serialNumber] the signer's certificate's serial number in
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* hexadecimal (eg: cert.serialNumber).
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* [digestAlgorithm] the message digest OID, as a string, to use
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* (eg: forge.pki.oids.sha1).
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* [authenticatedAttributes] an optional array of attributes
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* to also sign along with the content.
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*/
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addSigner: function(signer) {
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var issuer = signer.issuer;
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var serialNumber = signer.serialNumber;
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if(signer.certificate) {
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var cert = signer.certificate;
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if(typeof cert === 'string') {
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cert = forge.pki.certificateFromPem(cert);
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}
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issuer = cert.issuer.attributes;
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serialNumber = cert.serialNumber;
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}
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var key = signer.key;
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if(!key) {
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throw new Error(
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'Could not add PKCS#7 signer; no private key specified.');
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}
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if(typeof key === 'string') {
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key = forge.pki.privateKeyFromPem(key);
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}
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// ensure OID known for digest algorithm
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var digestAlgorithm = signer.digestAlgorithm || forge.pki.oids.sha1;
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switch(digestAlgorithm) {
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case forge.pki.oids.sha1:
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case forge.pki.oids.sha256:
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case forge.pki.oids.sha384:
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case forge.pki.oids.sha512:
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case forge.pki.oids.md5:
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break;
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default:
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throw new Error(
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'Could not add PKCS#7 signer; unknown message digest algorithm: ' +
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digestAlgorithm);
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}
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// if authenticatedAttributes is present, then the attributes
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// must contain at least PKCS #9 content-type and message-digest
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var authenticatedAttributes = signer.authenticatedAttributes || [];
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if(authenticatedAttributes.length > 0) {
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var contentType = false;
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var messageDigest = false;
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for(var i = 0; i < authenticatedAttributes.length; ++i) {
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var attr = authenticatedAttributes[i];
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if(!contentType && attr.type === forge.pki.oids.contentType) {
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contentType = true;
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if(messageDigest) {
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break;
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}
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continue;
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}
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if(!messageDigest && attr.type === forge.pki.oids.messageDigest) {
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messageDigest = true;
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if(contentType) {
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break;
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}
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continue;
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}
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}
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if(!contentType || !messageDigest) {
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throw new Error('Invalid signer.authenticatedAttributes. If ' +
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'signer.authenticatedAttributes is specified, then it must ' +
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'contain at least two attributes, PKCS #9 content-type and ' +
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'PKCS #9 message-digest.');
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}
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}
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msg.signers.push({
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key: key,
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version: 1,
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issuer: issuer,
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serialNumber: serialNumber,
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digestAlgorithm: digestAlgorithm,
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signatureAlgorithm: forge.pki.oids.rsaEncryption,
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signature: null,
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authenticatedAttributes: authenticatedAttributes,
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unauthenticatedAttributes: []
|
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});
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},
|
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/**
|
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* Signs the content.
|
||
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*/
|
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sign: function() {
|
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// auto-generate content info
|
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if(typeof msg.content !== 'object' || msg.contentInfo === null) {
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// use Data ContentInfo
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msg.contentInfo = asn1.create(
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asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
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// ContentType
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
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asn1.oidToDer(forge.pki.oids.data).getBytes())
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]);
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|
||
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// add actual content, if present
|
||
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if('content' in msg) {
|
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var content;
|
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if(msg.content instanceof forge.util.ByteBuffer) {
|
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content = msg.content.bytes();
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} else if(typeof msg.content === 'string') {
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content = forge.util.encodeUtf8(msg.content);
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}
|
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msg.contentInfo.value.push(
|
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// [0] EXPLICIT content
|
||
|
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asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, [
|
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asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false,
|
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content)
|
||
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]));
|
||
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}
|
||
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}
|
||
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|
||
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// no signers, return early (degenerate case for certificate container)
|
||
|
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if(msg.signers.length === 0) {
|
||
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return;
|
||
|
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}
|
||
|
|
|
||
|
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// generate digest algorithm identifiers
|
||
|
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var mds = addDigestAlgorithmIds();
|
||
|
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|
||
|
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// generate signerInfos
|
||
|
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addSignerInfos(mds);
|
||
|
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},
|
||
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|
|
||
|
|
verify: function() {
|
||
|
|
throw new Error('PKCS#7 signature verification not yet implemented.');
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add a certificate.
|
||
|
|
*
|
||
|
|
* @param cert the certificate to add.
|
||
|
|
*/
|
||
|
|
addCertificate: function(cert) {
|
||
|
|
// convert from PEM
|
||
|
|
if(typeof cert === 'string') {
|
||
|
|
cert = forge.pki.certificateFromPem(cert);
|
||
|
|
}
|
||
|
|
msg.certificates.push(cert);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add a certificate revokation list.
|
||
|
|
*
|
||
|
|
* @param crl the certificate revokation list to add.
|
||
|
|
*/
|
||
|
|
addCertificateRevokationList: function(crl) {
|
||
|
|
throw new Error('PKCS#7 CRL support not yet implemented.');
|
||
|
|
}
|
||
|
|
};
|
||
|
|
return msg;
|
||
|
|
|
||
|
|
function addDigestAlgorithmIds() {
|
||
|
|
var mds = {};
|
||
|
|
|
||
|
|
for(var i = 0; i < msg.signers.length; ++i) {
|
||
|
|
var signer = msg.signers[i];
|
||
|
|
var oid = signer.digestAlgorithm;
|
||
|
|
if(!(oid in mds)) {
|
||
|
|
// content digest
|
||
|
|
mds[oid] = forge.md[forge.pki.oids[oid]].create();
|
||
|
|
}
|
||
|
|
if(signer.authenticatedAttributes.length === 0) {
|
||
|
|
// no custom attributes to digest; use content message digest
|
||
|
|
signer.md = mds[oid];
|
||
|
|
} else {
|
||
|
|
// custom attributes to be digested; use own message digest
|
||
|
|
// TODO: optimize to just copy message digest state if that
|
||
|
|
// feature is ever supported with message digests
|
||
|
|
signer.md = forge.md[forge.pki.oids[oid]].create();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// add unique digest algorithm identifiers
|
||
|
|
msg.digestAlgorithmIdentifiers = [];
|
||
|
|
for(var oid in mds) {
|
||
|
|
msg.digestAlgorithmIdentifiers.push(
|
||
|
|
// AlgorithmIdentifier
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// algorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(oid).getBytes()),
|
||
|
|
// parameters (null)
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.NULL, false, '')
|
||
|
|
]));
|
||
|
|
}
|
||
|
|
|
||
|
|
return mds;
|
||
|
|
}
|
||
|
|
|
||
|
|
function addSignerInfos(mds) {
|
||
|
|
// Note: ContentInfo is a SEQUENCE with 2 values, second value is
|
||
|
|
// the content field and is optional for a ContentInfo but required here
|
||
|
|
// since signers are present
|
||
|
|
if(msg.contentInfo.value.length < 2) {
|
||
|
|
throw new Error(
|
||
|
|
'Could not sign PKCS#7 message; there is no content to sign.');
|
||
|
|
}
|
||
|
|
|
||
|
|
// get ContentInfo content type
|
||
|
|
var contentType = asn1.derToOid(msg.contentInfo.value[0].value);
|
||
|
|
|
||
|
|
// get ContentInfo content
|
||
|
|
var content = msg.contentInfo.value[1];
|
||
|
|
// skip [0] EXPLICIT content wrapper
|
||
|
|
content = content.value[0];
|
||
|
|
|
||
|
|
// serialize content
|
||
|
|
var bytes = asn1.toDer(content);
|
||
|
|
|
||
|
|
// skip identifier and length per RFC 2315 9.3
|
||
|
|
// skip identifier (1 byte)
|
||
|
|
bytes.getByte();
|
||
|
|
// read and discard length bytes
|
||
|
|
asn1.getBerValueLength(bytes);
|
||
|
|
bytes = bytes.getBytes();
|
||
|
|
|
||
|
|
// digest content DER value bytes
|
||
|
|
for(var oid in mds) {
|
||
|
|
mds[oid].start().update(bytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
// sign content
|
||
|
|
var signingTime = new Date();
|
||
|
|
for(var i = 0; i < msg.signers.length; ++i) {
|
||
|
|
var signer = msg.signers[i];
|
||
|
|
|
||
|
|
if(signer.authenticatedAttributes.length === 0) {
|
||
|
|
// if ContentInfo content type is not "Data", then
|
||
|
|
// authenticatedAttributes must be present per RFC 2315
|
||
|
|
if(contentType !== forge.pki.oids.data) {
|
||
|
|
throw new Error(
|
||
|
|
'Invalid signer; authenticatedAttributes must be present ' +
|
||
|
|
'when the ContentInfo content type is not PKCS#7 Data.');
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// process authenticated attributes
|
||
|
|
// [0] IMPLICIT
|
||
|
|
signer.authenticatedAttributesAsn1 = asn1.create(
|
||
|
|
asn1.Class.CONTEXT_SPECIFIC, 0, true, []);
|
||
|
|
|
||
|
|
// per RFC 2315, attributes are to be digested using a SET container
|
||
|
|
// not the above [0] IMPLICIT container
|
||
|
|
var attrsAsn1 = asn1.create(
|
||
|
|
asn1.Class.UNIVERSAL, asn1.Type.SET, true, []);
|
||
|
|
|
||
|
|
for(var ai = 0; ai < signer.authenticatedAttributes.length; ++ai) {
|
||
|
|
var attr = signer.authenticatedAttributes[ai];
|
||
|
|
if(attr.type === forge.pki.oids.messageDigest) {
|
||
|
|
// use content message digest as value
|
||
|
|
attr.value = mds[signer.digestAlgorithm].digest();
|
||
|
|
} else if(attr.type === forge.pki.oids.signingTime) {
|
||
|
|
// auto-populate signing time if not already set
|
||
|
|
if(!attr.value) {
|
||
|
|
attr.value = signingTime;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// convert to ASN.1 and push onto Attributes SET (for signing) and
|
||
|
|
// onto authenticatedAttributesAsn1 to complete SignedData ASN.1
|
||
|
|
// TODO: optimize away duplication
|
||
|
|
attrsAsn1.value.push(_attributeToAsn1(attr));
|
||
|
|
signer.authenticatedAttributesAsn1.value.push(_attributeToAsn1(attr));
|
||
|
|
}
|
||
|
|
|
||
|
|
// DER-serialize and digest SET OF attributes only
|
||
|
|
bytes = asn1.toDer(attrsAsn1).getBytes();
|
||
|
|
signer.md.start().update(bytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
// sign digest
|
||
|
|
signer.signature = signer.key.sign(signer.md, 'RSASSA-PKCS1-V1_5');
|
||
|
|
}
|
||
|
|
|
||
|
|
// add signer info
|
||
|
|
msg.signerInfos = _signersToAsn1(msg.signers);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates an empty PKCS#7 message of type EncryptedData.
|
||
|
|
*
|
||
|
|
* @return the message.
|
||
|
|
*/
|
||
|
|
p7.createEncryptedData = function() {
|
||
|
|
var msg = null;
|
||
|
|
msg = {
|
||
|
|
type: forge.pki.oids.encryptedData,
|
||
|
|
version: 0,
|
||
|
|
encryptedContent: {
|
||
|
|
algorithm: forge.pki.oids['aes256-CBC']
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reads an EncryptedData content block (in ASN.1 format)
|
||
|
|
*
|
||
|
|
* @param obj The ASN.1 representation of the EncryptedData content block
|
||
|
|
*/
|
||
|
|
fromAsn1: function(obj) {
|
||
|
|
// Validate EncryptedData content block and capture data.
|
||
|
|
_fromAsn1(msg, obj, p7.asn1.encryptedDataValidator);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decrypt encrypted content
|
||
|
|
*
|
||
|
|
* @param key The (symmetric) key as a byte buffer
|
||
|
|
*/
|
||
|
|
decrypt: function(key) {
|
||
|
|
if(key !== undefined) {
|
||
|
|
msg.encryptedContent.key = key;
|
||
|
|
}
|
||
|
|
_decryptContent(msg);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
return msg;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates an empty PKCS#7 message of type EnvelopedData.
|
||
|
|
*
|
||
|
|
* @return the message.
|
||
|
|
*/
|
||
|
|
p7.createEnvelopedData = function() {
|
||
|
|
var msg = null;
|
||
|
|
msg = {
|
||
|
|
type: forge.pki.oids.envelopedData,
|
||
|
|
version: 0,
|
||
|
|
recipients: [],
|
||
|
|
encryptedContent: {
|
||
|
|
algorithm: forge.pki.oids['aes256-CBC']
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reads an EnvelopedData content block (in ASN.1 format)
|
||
|
|
*
|
||
|
|
* @param obj the ASN.1 representation of the EnvelopedData content block.
|
||
|
|
*/
|
||
|
|
fromAsn1: function(obj) {
|
||
|
|
// validate EnvelopedData content block and capture data
|
||
|
|
var capture = _fromAsn1(msg, obj, p7.asn1.envelopedDataValidator);
|
||
|
|
msg.recipients = _recipientsFromAsn1(capture.recipientInfos.value);
|
||
|
|
},
|
||
|
|
|
||
|
|
toAsn1: function() {
|
||
|
|
// ContentInfo
|
||
|
|
return asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// ContentType
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(msg.type).getBytes()),
|
||
|
|
// [0] EnvelopedData
|
||
|
|
asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, [
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// Version
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
|
||
|
|
asn1.integerToDer(msg.version).getBytes()),
|
||
|
|
// RecipientInfos
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SET, true,
|
||
|
|
_recipientsToAsn1(msg.recipients)),
|
||
|
|
// EncryptedContentInfo
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true,
|
||
|
|
_encryptedContentToAsn1(msg.encryptedContent))
|
||
|
|
])
|
||
|
|
])
|
||
|
|
]);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find recipient by X.509 certificate's issuer.
|
||
|
|
*
|
||
|
|
* @param cert the certificate with the issuer to look for.
|
||
|
|
*
|
||
|
|
* @return the recipient object.
|
||
|
|
*/
|
||
|
|
findRecipient: function(cert) {
|
||
|
|
var sAttr = cert.issuer.attributes;
|
||
|
|
|
||
|
|
for(var i = 0; i < msg.recipients.length; ++i) {
|
||
|
|
var r = msg.recipients[i];
|
||
|
|
var rAttr = r.issuer;
|
||
|
|
|
||
|
|
if(r.serialNumber !== cert.serialNumber) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(rAttr.length !== sAttr.length) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
var match = true;
|
||
|
|
for(var j = 0; j < sAttr.length; ++j) {
|
||
|
|
if(rAttr[j].type !== sAttr[j].type ||
|
||
|
|
rAttr[j].value !== sAttr[j].value) {
|
||
|
|
match = false;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(match) {
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return null;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decrypt enveloped content
|
||
|
|
*
|
||
|
|
* @param recipient The recipient object related to the private key
|
||
|
|
* @param privKey The (RSA) private key object
|
||
|
|
*/
|
||
|
|
decrypt: function(recipient, privKey) {
|
||
|
|
if(msg.encryptedContent.key === undefined && recipient !== undefined &&
|
||
|
|
privKey !== undefined) {
|
||
|
|
switch(recipient.encryptedContent.algorithm) {
|
||
|
|
case forge.pki.oids.rsaEncryption:
|
||
|
|
case forge.pki.oids.desCBC:
|
||
|
|
var key = privKey.decrypt(recipient.encryptedContent.content);
|
||
|
|
msg.encryptedContent.key = forge.util.createBuffer(key);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new Error('Unsupported asymmetric cipher, ' +
|
||
|
|
'OID ' + recipient.encryptedContent.algorithm);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
_decryptContent(msg);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add (another) entity to list of recipients.
|
||
|
|
*
|
||
|
|
* @param cert The certificate of the entity to add.
|
||
|
|
*/
|
||
|
|
addRecipient: function(cert) {
|
||
|
|
msg.recipients.push({
|
||
|
|
version: 0,
|
||
|
|
issuer: cert.issuer.attributes,
|
||
|
|
serialNumber: cert.serialNumber,
|
||
|
|
encryptedContent: {
|
||
|
|
// We simply assume rsaEncryption here, since forge.pki only
|
||
|
|
// supports RSA so far. If the PKI module supports other
|
||
|
|
// ciphers one day, we need to modify this one as well.
|
||
|
|
algorithm: forge.pki.oids.rsaEncryption,
|
||
|
|
key: cert.publicKey
|
||
|
|
}
|
||
|
|
});
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Encrypt enveloped content.
|
||
|
|
*
|
||
|
|
* This function supports two optional arguments, cipher and key, which
|
||
|
|
* can be used to influence symmetric encryption. Unless cipher is
|
||
|
|
* provided, the cipher specified in encryptedContent.algorithm is used
|
||
|
|
* (defaults to AES-256-CBC). If no key is provided, encryptedContent.key
|
||
|
|
* is (re-)used. If that one's not set, a random key will be generated
|
||
|
|
* automatically.
|
||
|
|
*
|
||
|
|
* @param [key] The key to be used for symmetric encryption.
|
||
|
|
* @param [cipher] The OID of the symmetric cipher to use.
|
||
|
|
*/
|
||
|
|
encrypt: function(key, cipher) {
|
||
|
|
// Part 1: Symmetric encryption
|
||
|
|
if(msg.encryptedContent.content === undefined) {
|
||
|
|
cipher = cipher || msg.encryptedContent.algorithm;
|
||
|
|
key = key || msg.encryptedContent.key;
|
||
|
|
|
||
|
|
var keyLen, ivLen, ciphFn;
|
||
|
|
switch(cipher) {
|
||
|
|
case forge.pki.oids['aes128-CBC']:
|
||
|
|
keyLen = 16;
|
||
|
|
ivLen = 16;
|
||
|
|
ciphFn = forge.aes.createEncryptionCipher;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case forge.pki.oids['aes192-CBC']:
|
||
|
|
keyLen = 24;
|
||
|
|
ivLen = 16;
|
||
|
|
ciphFn = forge.aes.createEncryptionCipher;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case forge.pki.oids['aes256-CBC']:
|
||
|
|
keyLen = 32;
|
||
|
|
ivLen = 16;
|
||
|
|
ciphFn = forge.aes.createEncryptionCipher;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case forge.pki.oids['des-EDE3-CBC']:
|
||
|
|
keyLen = 24;
|
||
|
|
ivLen = 8;
|
||
|
|
ciphFn = forge.des.createEncryptionCipher;
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new Error('Unsupported symmetric cipher, OID ' + cipher);
|
||
|
|
}
|
||
|
|
|
||
|
|
if(key === undefined) {
|
||
|
|
key = forge.util.createBuffer(forge.random.getBytes(keyLen));
|
||
|
|
} else if(key.length() != keyLen) {
|
||
|
|
throw new Error('Symmetric key has wrong length; ' +
|
||
|
|
'got ' + key.length() + ' bytes, expected ' + keyLen + '.');
|
||
|
|
}
|
||
|
|
|
||
|
|
// Keep a copy of the key & IV in the object, so the caller can
|
||
|
|
// use it for whatever reason.
|
||
|
|
msg.encryptedContent.algorithm = cipher;
|
||
|
|
msg.encryptedContent.key = key;
|
||
|
|
msg.encryptedContent.parameter = forge.util.createBuffer(
|
||
|
|
forge.random.getBytes(ivLen));
|
||
|
|
|
||
|
|
var ciph = ciphFn(key);
|
||
|
|
ciph.start(msg.encryptedContent.parameter.copy());
|
||
|
|
ciph.update(msg.content);
|
||
|
|
|
||
|
|
// The finish function does PKCS#7 padding by default, therefore
|
||
|
|
// no action required by us.
|
||
|
|
if(!ciph.finish()) {
|
||
|
|
throw new Error('Symmetric encryption failed.');
|
||
|
|
}
|
||
|
|
|
||
|
|
msg.encryptedContent.content = ciph.output;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Part 2: asymmetric encryption for each recipient
|
||
|
|
for(var i = 0; i < msg.recipients.length; ++i) {
|
||
|
|
var recipient = msg.recipients[i];
|
||
|
|
|
||
|
|
// Nothing to do, encryption already done.
|
||
|
|
if(recipient.encryptedContent.content !== undefined) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch(recipient.encryptedContent.algorithm) {
|
||
|
|
case forge.pki.oids.rsaEncryption:
|
||
|
|
recipient.encryptedContent.content =
|
||
|
|
recipient.encryptedContent.key.encrypt(
|
||
|
|
msg.encryptedContent.key.data);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new Error('Unsupported asymmetric cipher, OID ' +
|
||
|
|
recipient.encryptedContent.algorithm);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
return msg;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a single recipient from an ASN.1 object.
|
||
|
|
*
|
||
|
|
* @param obj the ASN.1 RecipientInfo.
|
||
|
|
*
|
||
|
|
* @return the recipient object.
|
||
|
|
*/
|
||
|
|
function _recipientFromAsn1(obj) {
|
||
|
|
// validate EnvelopedData content block and capture data
|
||
|
|
var capture = {};
|
||
|
|
var errors = [];
|
||
|
|
if(!asn1.validate(obj, p7.asn1.recipientInfoValidator, capture, errors)) {
|
||
|
|
var error = new Error('Cannot read PKCS#7 RecipientInfo. ' +
|
||
|
|
'ASN.1 object is not an PKCS#7 RecipientInfo.');
|
||
|
|
error.errors = errors;
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
version: capture.version.charCodeAt(0),
|
||
|
|
issuer: forge.pki.RDNAttributesAsArray(capture.issuer),
|
||
|
|
serialNumber: forge.util.createBuffer(capture.serial).toHex(),
|
||
|
|
encryptedContent: {
|
||
|
|
algorithm: asn1.derToOid(capture.encAlgorithm),
|
||
|
|
parameter: capture.encParameter.value,
|
||
|
|
content: capture.encKey
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a single recipient object to an ASN.1 object.
|
||
|
|
*
|
||
|
|
* @param obj the recipient object.
|
||
|
|
*
|
||
|
|
* @return the ASN.1 RecipientInfo.
|
||
|
|
*/
|
||
|
|
function _recipientToAsn1(obj) {
|
||
|
|
return asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// Version
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
|
||
|
|
asn1.integerToDer(obj.version).getBytes()),
|
||
|
|
// IssuerAndSerialNumber
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// Name
|
||
|
|
forge.pki.distinguishedNameToAsn1({attributes: obj.issuer}),
|
||
|
|
// Serial
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
|
||
|
|
forge.util.hexToBytes(obj.serialNumber))
|
||
|
|
]),
|
||
|
|
// KeyEncryptionAlgorithmIdentifier
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// Algorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(obj.encryptedContent.algorithm).getBytes()),
|
||
|
|
// Parameter, force NULL, only RSA supported for now.
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.NULL, false, '')
|
||
|
|
]),
|
||
|
|
// EncryptedKey
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false,
|
||
|
|
obj.encryptedContent.content)
|
||
|
|
]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Map a set of RecipientInfo ASN.1 objects to recipient objects.
|
||
|
|
*
|
||
|
|
* @param infos an array of ASN.1 representations RecipientInfo (i.e. SET OF).
|
||
|
|
*
|
||
|
|
* @return an array of recipient objects.
|
||
|
|
*/
|
||
|
|
function _recipientsFromAsn1(infos) {
|
||
|
|
var ret = [];
|
||
|
|
for(var i = 0; i < infos.length; ++i) {
|
||
|
|
ret.push(_recipientFromAsn1(infos[i]));
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Map an array of recipient objects to ASN.1 RecipientInfo objects.
|
||
|
|
*
|
||
|
|
* @param recipients an array of recipientInfo objects.
|
||
|
|
*
|
||
|
|
* @return an array of ASN.1 RecipientInfos.
|
||
|
|
*/
|
||
|
|
function _recipientsToAsn1(recipients) {
|
||
|
|
var ret = [];
|
||
|
|
for(var i = 0; i < recipients.length; ++i) {
|
||
|
|
ret.push(_recipientToAsn1(recipients[i]));
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a single signer from an ASN.1 object.
|
||
|
|
*
|
||
|
|
* @param obj the ASN.1 representation of a SignerInfo.
|
||
|
|
*
|
||
|
|
* @return the signer object.
|
||
|
|
*/
|
||
|
|
function _signerFromAsn1(obj) {
|
||
|
|
// validate EnvelopedData content block and capture data
|
||
|
|
var capture = {};
|
||
|
|
var errors = [];
|
||
|
|
if(!asn1.validate(obj, p7.asn1.signerInfoValidator, capture, errors)) {
|
||
|
|
var error = new Error('Cannot read PKCS#7 SignerInfo. ' +
|
||
|
|
'ASN.1 object is not an PKCS#7 SignerInfo.');
|
||
|
|
error.errors = errors;
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
|
||
|
|
var rval = {
|
||
|
|
version: capture.version.charCodeAt(0),
|
||
|
|
issuer: forge.pki.RDNAttributesAsArray(capture.issuer),
|
||
|
|
serialNumber: forge.util.createBuffer(capture.serial).toHex(),
|
||
|
|
digestAlgorithm: asn1.derToOid(capture.digestAlgorithm),
|
||
|
|
signatureAlgorithm: asn1.derToOid(capture.signatureAlgorithm),
|
||
|
|
signature: capture.signature,
|
||
|
|
authenticatedAttributes: [],
|
||
|
|
unauthenticatedAttributes: []
|
||
|
|
};
|
||
|
|
|
||
|
|
// TODO: convert attributes
|
||
|
|
var authenticatedAttributes = capture.authenticatedAttributes || [];
|
||
|
|
var unauthenticatedAttributes = capture.unauthenticatedAttributes || [];
|
||
|
|
|
||
|
|
return rval;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a single signerInfo object to an ASN.1 object.
|
||
|
|
*
|
||
|
|
* @param obj the signerInfo object.
|
||
|
|
*
|
||
|
|
* @return the ASN.1 representation of a SignerInfo.
|
||
|
|
*/
|
||
|
|
function _signerToAsn1(obj) {
|
||
|
|
// SignerInfo
|
||
|
|
var rval = asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// version
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
|
||
|
|
asn1.integerToDer(obj.version).getBytes()),
|
||
|
|
// issuerAndSerialNumber
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// name
|
||
|
|
forge.pki.distinguishedNameToAsn1({attributes: obj.issuer}),
|
||
|
|
// serial
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.INTEGER, false,
|
||
|
|
forge.util.hexToBytes(obj.serialNumber))
|
||
|
|
]),
|
||
|
|
// digestAlgorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// algorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(obj.digestAlgorithm).getBytes()),
|
||
|
|
// parameters (null)
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.NULL, false, '')
|
||
|
|
])
|
||
|
|
]);
|
||
|
|
|
||
|
|
// authenticatedAttributes (OPTIONAL)
|
||
|
|
if(obj.authenticatedAttributesAsn1) {
|
||
|
|
// add ASN.1 previously generated during signing
|
||
|
|
rval.value.push(obj.authenticatedAttributesAsn1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// digestEncryptionAlgorithm
|
||
|
|
rval.value.push(asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// algorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(obj.signatureAlgorithm).getBytes()),
|
||
|
|
// parameters (null)
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.NULL, false, '')
|
||
|
|
]));
|
||
|
|
|
||
|
|
// encryptedDigest
|
||
|
|
rval.value.push(asn1.create(
|
||
|
|
asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false, obj.signature));
|
||
|
|
|
||
|
|
// unauthenticatedAttributes (OPTIONAL)
|
||
|
|
if(obj.unauthenticatedAttributes.length > 0) {
|
||
|
|
// [1] IMPLICIT
|
||
|
|
var attrsAsn1 = asn1.create(asn1.Class.CONTEXT_SPECIFIC, 1, true, []);
|
||
|
|
for(var i = 0; i < obj.unauthenticatedAttributes.length; ++i) {
|
||
|
|
var attr = obj.unauthenticatedAttributes[i];
|
||
|
|
attrsAsn1.values.push(_attributeToAsn1(attr));
|
||
|
|
}
|
||
|
|
rval.value.push(attrsAsn1);
|
||
|
|
}
|
||
|
|
|
||
|
|
return rval;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Map a set of SignerInfo ASN.1 objects to an array of signer objects.
|
||
|
|
*
|
||
|
|
* @param signerInfoAsn1s an array of ASN.1 SignerInfos (i.e. SET OF).
|
||
|
|
*
|
||
|
|
* @return an array of signers objects.
|
||
|
|
*/
|
||
|
|
function _signersFromAsn1(signerInfoAsn1s) {
|
||
|
|
var ret = [];
|
||
|
|
for(var i = 0; i < signerInfoAsn1s.length; ++i) {
|
||
|
|
ret.push(_signerFromAsn1(signerInfoAsn1s[i]));
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Map an array of signer objects to ASN.1 objects.
|
||
|
|
*
|
||
|
|
* @param signers an array of signer objects.
|
||
|
|
*
|
||
|
|
* @return an array of ASN.1 SignerInfos.
|
||
|
|
*/
|
||
|
|
function _signersToAsn1(signers) {
|
||
|
|
var ret = [];
|
||
|
|
for(var i = 0; i < signers.length; ++i) {
|
||
|
|
ret.push(_signerToAsn1(signers[i]));
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convert an attribute object to an ASN.1 Attribute.
|
||
|
|
*
|
||
|
|
* @param attr the attribute object.
|
||
|
|
*
|
||
|
|
* @return the ASN.1 Attribute.
|
||
|
|
*/
|
||
|
|
function _attributeToAsn1(attr) {
|
||
|
|
var value;
|
||
|
|
|
||
|
|
// TODO: generalize to support more attributes
|
||
|
|
if(attr.type === forge.pki.oids.contentType) {
|
||
|
|
value = asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(attr.value).getBytes());
|
||
|
|
} else if(attr.type === forge.pki.oids.messageDigest) {
|
||
|
|
value = asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false,
|
||
|
|
attr.value.bytes());
|
||
|
|
} else if(attr.type === forge.pki.oids.signingTime) {
|
||
|
|
/* Note per RFC 2985: Dates between 1 January 1950 and 31 December 2049
|
||
|
|
(inclusive) MUST be encoded as UTCTime. Any dates with year values
|
||
|
|
before 1950 or after 2049 MUST be encoded as GeneralizedTime. [Further,]
|
||
|
|
UTCTime values MUST be expressed in Greenwich Mean Time (Zulu) and MUST
|
||
|
|
include seconds (i.e., times are YYMMDDHHMMSSZ), even where the
|
||
|
|
number of seconds is zero. Midnight (GMT) must be represented as
|
||
|
|
"YYMMDD000000Z". */
|
||
|
|
// TODO: make these module-level constants
|
||
|
|
var jan_1_1950 = new Date('1950-01-01T00:00:00Z');
|
||
|
|
var jan_1_2050 = new Date('2050-01-01T00:00:00Z');
|
||
|
|
var date = attr.value;
|
||
|
|
if(typeof date === 'string') {
|
||
|
|
// try to parse date
|
||
|
|
var timestamp = Date.parse(date);
|
||
|
|
if(!isNaN(timestamp)) {
|
||
|
|
date = new Date(timestamp);
|
||
|
|
} else if(date.length === 13) {
|
||
|
|
// YYMMDDHHMMSSZ (13 chars for UTCTime)
|
||
|
|
date = asn1.utcTimeToDate(date);
|
||
|
|
} else {
|
||
|
|
// assume generalized time
|
||
|
|
date = asn1.generalizedTimeToDate(date);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(date >= jan_1_1950 && date < jan_1_2050) {
|
||
|
|
value = asn1.create(
|
||
|
|
asn1.Class.UNIVERSAL, asn1.Type.UTCTIME, false,
|
||
|
|
asn1.dateToUtcTime(date));
|
||
|
|
} else {
|
||
|
|
value = asn1.create(
|
||
|
|
asn1.Class.UNIVERSAL, asn1.Type.GENERALIZEDTIME, false,
|
||
|
|
asn1.dateToGeneralizedTime(date));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: expose as common API call
|
||
|
|
// create a RelativeDistinguishedName set
|
||
|
|
// each value in the set is an AttributeTypeAndValue first
|
||
|
|
// containing the type (an OID) and second the value
|
||
|
|
return asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// AttributeType
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(attr.type).getBytes()),
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SET, true, [
|
||
|
|
// AttributeValue
|
||
|
|
value
|
||
|
|
])
|
||
|
|
]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Map messages encrypted content to ASN.1 objects.
|
||
|
|
*
|
||
|
|
* @param ec The encryptedContent object of the message.
|
||
|
|
*
|
||
|
|
* @return ASN.1 representation of the encryptedContent object (SEQUENCE).
|
||
|
|
*/
|
||
|
|
function _encryptedContentToAsn1(ec) {
|
||
|
|
return [
|
||
|
|
// ContentType, always Data for the moment
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(forge.pki.oids.data).getBytes()),
|
||
|
|
// ContentEncryptionAlgorithmIdentifier
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [
|
||
|
|
// Algorithm
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false,
|
||
|
|
asn1.oidToDer(ec.algorithm).getBytes()),
|
||
|
|
// Parameters (IV)
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false,
|
||
|
|
ec.parameter.getBytes())
|
||
|
|
]),
|
||
|
|
// [0] EncryptedContent
|
||
|
|
asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, [
|
||
|
|
asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false,
|
||
|
|
ec.content.getBytes())
|
||
|
|
])
|
||
|
|
];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reads the "common part" of an PKCS#7 content block (in ASN.1 format)
|
||
|
|
*
|
||
|
|
* This function reads the "common part" of the PKCS#7 content blocks
|
||
|
|
* EncryptedData and EnvelopedData, i.e. version number and symmetrically
|
||
|
|
* encrypted content block.
|
||
|
|
*
|
||
|
|
* The result of the ASN.1 validate and capture process is returned
|
||
|
|
* to allow the caller to extract further data, e.g. the list of recipients
|
||
|
|
* in case of a EnvelopedData object.
|
||
|
|
*
|
||
|
|
* @param msg the PKCS#7 object to read the data to.
|
||
|
|
* @param obj the ASN.1 representation of the content block.
|
||
|
|
* @param validator the ASN.1 structure validator object to use.
|
||
|
|
*
|
||
|
|
* @return the value map captured by validator object.
|
||
|
|
*/
|
||
|
|
function _fromAsn1(msg, obj, validator) {
|
||
|
|
var capture = {};
|
||
|
|
var errors = [];
|
||
|
|
if(!asn1.validate(obj, validator, capture, errors)) {
|
||
|
|
var error = new Error('Cannot read PKCS#7 message. ' +
|
||
|
|
'ASN.1 object is not a supported PKCS#7 message.');
|
||
|
|
error.errors = error;
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check contentType, so far we only support (raw) Data.
|
||
|
|
var contentType = asn1.derToOid(capture.contentType);
|
||
|
|
if(contentType !== forge.pki.oids.data) {
|
||
|
|
throw new Error('Unsupported PKCS#7 message. ' +
|
||
|
|
'Only wrapped ContentType Data supported.');
|
||
|
|
}
|
||
|
|
|
||
|
|
if(capture.encryptedContent) {
|
||
|
|
var content = '';
|
||
|
|
if(forge.util.isArray(capture.encryptedContent)) {
|
||
|
|
for(var i = 0; i < capture.encryptedContent.length; ++i) {
|
||
|
|
if(capture.encryptedContent[i].type !== asn1.Type.OCTETSTRING) {
|
||
|
|
throw new Error('Malformed PKCS#7 message, expecting encrypted ' +
|
||
|
|
'content constructed of only OCTET STRING objects.');
|
||
|
|
}
|
||
|
|
content += capture.encryptedContent[i].value;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
content = capture.encryptedContent;
|
||
|
|
}
|
||
|
|
msg.encryptedContent = {
|
||
|
|
algorithm: asn1.derToOid(capture.encAlgorithm),
|
||
|
|
parameter: forge.util.createBuffer(capture.encParameter.value),
|
||
|
|
content: forge.util.createBuffer(content)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
if(capture.content) {
|
||
|
|
var content = '';
|
||
|
|
if(forge.util.isArray(capture.content)) {
|
||
|
|
for(var i = 0; i < capture.content.length; ++i) {
|
||
|
|
if(capture.content[i].type !== asn1.Type.OCTETSTRING) {
|
||
|
|
throw new Error('Malformed PKCS#7 message, expecting ' +
|
||
|
|
'content constructed of only OCTET STRING objects.');
|
||
|
|
}
|
||
|
|
content += capture.content[i].value;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
content = capture.content;
|
||
|
|
}
|
||
|
|
msg.content = forge.util.createBuffer(content);
|
||
|
|
}
|
||
|
|
|
||
|
|
msg.version = capture.version.charCodeAt(0);
|
||
|
|
msg.rawCapture = capture;
|
||
|
|
|
||
|
|
return capture;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decrypt the symmetrically encrypted content block of the PKCS#7 message.
|
||
|
|
*
|
||
|
|
* Decryption is skipped in case the PKCS#7 message object already has a
|
||
|
|
* (decrypted) content attribute. The algorithm, key and cipher parameters
|
||
|
|
* (probably the iv) are taken from the encryptedContent attribute of the
|
||
|
|
* message object.
|
||
|
|
*
|
||
|
|
* @param The PKCS#7 message object.
|
||
|
|
*/
|
||
|
|
function _decryptContent(msg) {
|
||
|
|
if(msg.encryptedContent.key === undefined) {
|
||
|
|
throw new Error('Symmetric key not available.');
|
||
|
|
}
|
||
|
|
|
||
|
|
if(msg.content === undefined) {
|
||
|
|
var ciph;
|
||
|
|
|
||
|
|
switch(msg.encryptedContent.algorithm) {
|
||
|
|
case forge.pki.oids['aes128-CBC']:
|
||
|
|
case forge.pki.oids['aes192-CBC']:
|
||
|
|
case forge.pki.oids['aes256-CBC']:
|
||
|
|
ciph = forge.aes.createDecryptionCipher(msg.encryptedContent.key);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case forge.pki.oids['desCBC']:
|
||
|
|
case forge.pki.oids['des-EDE3-CBC']:
|
||
|
|
ciph = forge.des.createDecryptionCipher(msg.encryptedContent.key);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new Error('Unsupported symmetric cipher, OID ' +
|
||
|
|
msg.encryptedContent.algorithm);
|
||
|
|
}
|
||
|
|
ciph.start(msg.encryptedContent.parameter);
|
||
|
|
ciph.update(msg.encryptedContent.content);
|
||
|
|
|
||
|
|
if(!ciph.finish()) {
|
||
|
|
throw new Error('Symmetric decryption failed.');
|
||
|
|
}
|
||
|
|
|
||
|
|
msg.content = ciph.output;
|
||
|
|
}
|
||
|
|
}
|