public void TestKeyTransSmallAesUsingAoepMixedParams()
{
byte[] data = new byte[] { 0, 1, 2, 3 };
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddRecipientInfoGenerator(
new KeyTransRecipientInfoGenerator(
ReciCert,
new Asn1KeyWrapper(
PkcsObjectIdentifiers.IdRsaesOaep,
new RsaesOaepParameters(
new AlgorithmIdentifier(NistObjectIdentifiers.IdSha256, DerNull.Instance),
new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, new AlgorithmIdentifier(NistObjectIdentifiers.IdSha224, DerNull.Instance))),
ReciCert)));
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.Aes128Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid,
CmsEnvelopedDataGenerator.Aes128Cbc);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
private void TryKeyTrans(
string generatorOID,
DerObjectIdentifier checkOID,
Type asn1Params)
{
byte[] data = Encoding.ASCII.GetBytes("WallaWallaWashington");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddKeyTransRecipient(ReciCert);
CmsEnvelopedData ed = edGen.Generate(new CmsProcessableByteArray(data), generatorOID);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(checkOID.Id, ed.EncryptionAlgOid);
if (asn1Params != null)
{
Assert.IsTrue(asn1Params.IsInstanceOfType(ed.EncryptionAlgorithmID.Parameters));
}
ArrayList c = new ArrayList(recipients.GetRecipients());
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
Assert.AreEqual(recipient.KeyEncryptionAlgOid, PkcsObjectIdentifiers.RsaEncryption.Id);
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public void TestErroneousKek()
{
byte[] data = Encoding.ASCII.GetBytes("WallaWallaWashington");
KeyParameter kek = ParameterUtilities.CreateKeyParameter(
"AES",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 });
CmsEnvelopedData ed = new CmsEnvelopedData(oldKEK);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid, CmsEnvelopedDataGenerator.DesEde3Cbc);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
Assert.AreEqual(recipient.KeyEncryptionAlgOid, NistObjectIdentifiers.IdAes128Wrap.Id);
byte[] recData = recipient.GetContent(kek);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
private void PasswordUtf8Test(
string algorithm)
{
byte[] data = Hex.Decode("504b492d4320434d5320456e76656c6f706564446174612053616d706c65");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddPasswordRecipient(
new Pkcs5Scheme2Utf8PbeKey("abc\u5639\u563b".ToCharArray(), new byte[20], 5),
algorithm);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.Aes128Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid, CmsEnvelopedDataGenerator.Aes128Cbc);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (PasswordRecipientInformation recipient in c)
{
CmsPbeKey key = new Pkcs5Scheme2Utf8PbeKey(
"abc\u5639\u563b".ToCharArray(), recipient.KeyDerivationAlgorithm);
byte[] recData = recipient.GetContent(key);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
private void VerifyECMqvKeyAgreeVectors(
AsymmetricKeyParameter privKey,
string wrapAlg,
byte[] message)
{
byte[] data = Hex.Decode("504b492d4320434d5320456e76656c6f706564446174612053616d706c65");
CmsEnvelopedData ed = new CmsEnvelopedData(message);
RecipientInformationStore recipients = ed.GetRecipientInfos();
ICollection c = recipients.GetRecipients();
Assert.AreEqual(wrapAlg, ed.EncryptionAlgOid);
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
Assert.AreEqual("1.3.133.16.840.63.0.16", recipient.KeyEncryptionAlgOid);
byte[] recData = recipient.GetContent(privKey);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public void TestECMqvKeyAgreeMultiple()
{
byte[] data = Hex.Decode("504b492d4320434d5320456e76656c6f706564446174612053616d706c65");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
ArrayList recipientCerts = new ArrayList();
recipientCerts.Add(ReciECCert);
recipientCerts.Add(ReciECCert2);
edGen.AddKeyAgreementRecipients(
CmsEnvelopedDataGenerator.ECMqvSha1Kdf,
OrigECKP.Private,
OrigECKP.Public,
recipientCerts,
CmsEnvelopedDataGenerator.Aes128Wrap);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.Aes128Cbc);
Assert.AreEqual(ed.EncryptionAlgOid, CmsEnvelopedDataGenerator.Aes128Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
ConfirmDataReceived(recipients, data, ReciECCert, ReciECKP.Private);
ConfirmDataReceived(recipients, data, ReciECCert2, ReciECKP2.Private);
ConfirmNumberRecipients(recipients, 2);
}
public void TestRfc4134Ex5_1()
{
byte[] data = Hex.Decode("5468697320697320736f6d652073616d706c6520636f6e74656e742e");
// KeyFactory kFact = KeyFactory.GetInstance("RSA");
// Key key = kFact.generatePrivate(new PKCS8EncodedKeySpec(bobPrivRsaEncrypt));
AsymmetricKeyParameter key = PrivateKeyFactory.CreateKey(bobPrivRsaEncrypt);
CmsEnvelopedData ed = new CmsEnvelopedData(rfc4134ex5_1);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual("1.2.840.113549.3.7", ed.EncryptionAlgOid);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(key);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public void TestKeyTransSmallAesUsingAoepMixed()
{
byte[] data = new byte[] { 0, 1, 2, 3 };
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddRecipientInfoGenerator(new KeyTransRecipientInfoGenerator(ReciCert, new Asn1KeyWrapper("RSA/None/OAEPwithSHA256andMGF1withSHA1Padding", ReciCert)));
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.Aes128Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid,
CmsEnvelopedDataGenerator.Aes128Cbc);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
private void TryKekAlgorithm(
KeyParameter kek,
DerObjectIdentifier algOid)
{
byte[] data = Encoding.ASCII.GetBytes("WallaWallaWashington");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
byte[] kekId = new byte[] { 1, 2, 3, 4, 5 };
string keyAlgorithm = ParameterUtilities.GetCanonicalAlgorithmName(algOid.Id);
edGen.AddKekRecipient(keyAlgorithm, kek, kekId);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.DesEde3Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid, CmsEnvelopedDataGenerator.DesEde3Cbc);
ArrayList c = new ArrayList(recipients.GetRecipients());
Assert.IsTrue(c.Count > 0);
foreach (RecipientInformation recipient in c)
{
Assert.AreEqual(algOid.Id, recipient.KeyEncryptionAlgOid);
byte[] recData = recipient.GetContent(kek);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public void TestKeyTransSmallAes()
{
byte[] data = new byte[] { 0, 1, 2, 3 };
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddKeyTransRecipient(ReciCert);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
CmsEnvelopedDataGenerator.Aes128Cbc);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid,
CmsEnvelopedDataGenerator.Aes128Cbc);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
internal static byte[] FetchEnvelopedData(ICipherParameters certificateKey, X509Certificate certificate, PdfArray recipients)
{
bool foundRecipient = false;
byte[] envelopedData = null;
for (int i = 0; i < recipients.Size(); i++)
{
try {
PdfString recipient = recipients.GetAsString(i);
CmsEnvelopedData data = new CmsEnvelopedData(recipient.GetValueBytes());
foreach (RecipientInformation recipientInfo in data.GetRecipientInfos().GetRecipients())
{
if (recipientInfo.RecipientID.Match(certificate) && !foundRecipient)
{
envelopedData = recipientInfo.GetContent(certificateKey);
foundRecipient = true;
}
}
} catch (Exception f) {
throw new PdfException(PdfException.PdfDecryption, f);
}
}
if (!foundRecipient || envelopedData == null)
{
throw new PdfException(PdfException.BadCertificateAndKey);
}
return(envelopedData);
}
public void TestKeyTransOdes()
{
byte[] data = Encoding.ASCII.GetBytes("WallaWallaBouncyCastle");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddKeyTransRecipient(ReciCert);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
OiwObjectIdentifiers.DesCbc.Id);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid, OiwObjectIdentifiers.DesCbc.Id);
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public void TestKeyTrans128RC4()
{
byte[] data = Encoding.ASCII.GetBytes("WallaWallaBouncyCastle");
CmsEnvelopedDataGenerator edGen = new CmsEnvelopedDataGenerator();
edGen.AddKeyTransRecipient(ReciCert);
CmsEnvelopedData ed = edGen.Generate(
new CmsProcessableByteArray(data),
"1.2.840.113549.3.4", 128); // RC4 OID
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual(ed.EncryptionAlgOid, "1.2.840.113549.3.4");
ICollection c = recipients.GetRecipients();
Assert.AreEqual(1, c.Count);
foreach (RecipientInformation recipient in c)
{
byte[] recData = recipient.GetContent(ReciKP.Private);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}
public string Decrypt(string cipherText)
{
byte[] cipherBytes = Convert.FromBase64String(cipherText);
var envelopedData = new CmsEnvelopedData(cipherBytes);
RecipientInformationStore recipientsStore = envelopedData.GetRecipientInfos();
ICollection recipientsCollection = recipientsStore.GetRecipients();
IList recipients = recipientsCollection as IList;
byte[] plainBytes = new byte[] { };
int index = 0;
foreach (KeyTransRecipientInformation recipientInfo in recipients)
{
// todo: better approach than catching n exceptions.
RecipientInformation recipient = recipientsStore.GetFirstRecipient(recipientInfo.RecipientID);
try
{
plainBytes = recipient.GetContent(this.privateKey);
break;
}
catch (CmsException e) when(index != recipientsStore.Count - 1)
{
}
index++;
}
return(Encoding.UTF8.GetString(plainBytes));
}
private void VerifyEnvelopedData(CmsEnvelopedData envelopedData, string symAlgorithmOID)
{
byte[] privKeyData = GetRfc4134Data("BobPrivRSAEncrypt.pri");
IAsymmetricKeyParameter privKey = PrivateKeyFactory.CreateKey(privKeyData);
Assert.IsTrue(privKey.IsPrivate);
Assert.IsTrue(privKey is RsaKeyParameters);
RecipientInformationStore recipients = envelopedData.GetRecipientInfos();
Assert.AreEqual(envelopedData.EncryptionAlgOid, symAlgorithmOID);
ArrayList c = new ArrayList(recipients.GetRecipients());
Assert.LessOrEqual(1, c.Count);
Assert.GreaterOrEqual(2, c.Count);
VerifyRecipient((RecipientInformation)c[0], privKey);
if (c.Count == 2)
{
RecipientInformation recInfo = (RecipientInformation)c[1];
Assert.AreEqual(PkcsObjectIdentifiers.IdAlgCmsRC2Wrap.Id, recInfo.KeyEncryptionAlgOid);
}
}
public void TestOriginatorInfo()
{
CmsEnvelopedData env = new CmsEnvelopedData(CmsSampleMessages.originatorMessage);
RecipientInformationStore recipients = env.GetRecipientInfos();
Assert.AreEqual(CmsEnvelopedDataGenerator.DesEde3Cbc, env.EncryptionAlgOid);
}
/// <inheritdoc />
public byte[] Decrypt(byte[] data)
{
foreach (var pkcsStore in _allSenderCertificates)
{
var certAlias = pkcsStore.Aliases.Cast <string>().First(x => pkcsStore.IsKeyEntry(x));
var certEntry = pkcsStore.GetCertificate(certAlias);
var cert = certEntry.Certificate;
var envelopedData = new CmsEnvelopedData(data);
var recepientInfos = envelopedData.GetRecipientInfos();
var recepientId = new RecipientID()
{
Issuer = cert.IssuerDN,
SerialNumber = cert.SerialNumber
};
var recepient = recepientInfos[recepientId];
if (recepient == null)
{
continue;
}
var privKeyEntry = pkcsStore.GetKey(certAlias);
var privKey = privKeyEntry.Key;
var decryptedData = recepient.GetContent(privKey);
var sig = new CmsSignedData(decryptedData);
var sigInfos = sig.GetSignerInfos();
var signerId = new SignerID()
{
Issuer = _receiverCertificate.IssuerDN,
SerialNumber = _receiverCertificate.SerialNumber
};
var signer = sigInfos.GetFirstSigner(signerId);
if (!signer.Verify(_receiverCertificate))
{
throw new ExtraEncryptionException("Failed to verify the signature.");
}
var verifiedData = new MemoryStream();
sig.SignedContent.Write(verifiedData);
return(verifiedData.ToArray());
}
throw new ExtraEncryptionException("No certificate for decryption found.");
}
public void TestRfc4134Ex5_2()
{
byte[] data = Hex.Decode("5468697320697320736f6d652073616d706c6520636f6e74656e742e");
// KeyFactory kFact = KeyFactory.GetInstance("RSA");
// Key key = kFact.generatePrivate(new PKCS8EncodedKeySpec(bobPrivRsaEncrypt));
AsymmetricKeyParameter key = PrivateKeyFactory.CreateKey(bobPrivRsaEncrypt);
CmsEnvelopedData ed = new CmsEnvelopedData(rfc4134ex5_2);
RecipientInformationStore recipients = ed.GetRecipientInfos();
Assert.AreEqual("1.2.840.113549.3.2", ed.EncryptionAlgOid);
ICollection c = recipients.GetRecipients();
IEnumerator e = c.GetEnumerator();
if (e.MoveNext())
{
do
{
RecipientInformation recipient = (RecipientInformation)e.Current;
if (recipient is KeyTransRecipientInformation)
{
byte[] recData = recipient.GetContent(key);
Assert.IsTrue(Arrays.AreEqual(data, recData));
}
}while (e.MoveNext());
}
else
{
Assert.Fail("no recipient found");
}
}
private void VerifyEnvelopedData(CmsEnvelopedData envelopedData, string symAlgorithmOID)
{
byte[] privKeyData = GetRfc4134Data("BobPrivRSAEncrypt.pri");
AsymmetricKeyParameter privKey = PrivateKeyFactory.CreateKey(privKeyData);
Assert.IsTrue(privKey.IsPrivate);
Assert.IsTrue(privKey is RsaKeyParameters);
RecipientInformationStore recipients = envelopedData.GetRecipientInfos();
Assert.AreEqual(envelopedData.EncryptionAlgOid, symAlgorithmOID);
ArrayList c = new ArrayList(recipients.GetRecipients());
Assert.LessOrEqual(1, c.Count);
Assert.GreaterOrEqual(2, c.Count);
VerifyRecipient((RecipientInformation)c[0], privKey);
if (c.Count == 2)
{
RecipientInformation recInfo = (RecipientInformation)c[1];
Assert.AreEqual(PkcsObjectIdentifiers.IdAlgCmsRC2Wrap.Id, recInfo.KeyEncryptionAlgOid);
}
}
/**
* Prepares everything to decrypt the document.
*
* @param encryption encryption dictionary, can be retrieved via
* {@link Document#getEncryption()}
* @param documentIDArray document id which is returned via
* {@link org.apache.pdfbox.cos.COSDocument#getDocumentID()} (not used by
* this handler)
* @param decryptionMaterial Information used to decrypt the document.
*
* @throws IOException If there is an error accessing data. If verbose mode
* is enabled, the exception message will provide more details why the
* match wasn't successful.
*/
public override void PrepareForDecryption(PdfEncryption encryption, PdfArray documentIDArray, DecryptionMaterial decryptionMaterial)
{
if (!(decryptionMaterial is PublicKeyDecryptionMaterial))
{
throw new IOException(
"Provided decryption material is not compatible with the document");
}
SetDecryptMetadata(encryption.IsEncryptMetaData);
if (encryption.Length != 0)
{
this.keyLength = encryption.Length;
}
PublicKeyDecryptionMaterial material = (PublicKeyDecryptionMaterial)decryptionMaterial;
try
{
bool foundRecipient = false;
//Org.BouncyCastle.X509.Extension.
X509Certificate certificate = material.Certificate;
X509CertificateEntry materialCert = null;
if (certificate != null)
{
materialCert = new X509CertificateEntry(certificate);
}
// the decrypted content of the enveloped data that match
// the certificate in the decryption material provided
byte[] envelopedData = null;
// the bytes of each recipient in the recipients array
PdfArray array = (PdfArray)encryption.BaseDataObject.Resolve(PdfName.Recipients);
if (array == null)
{
PdfCryptFilterDictionary defaultCryptFilterDictionary = encryption.DefaultCryptFilterDictionary;
array = (PdfArray)defaultCryptFilterDictionary.BaseDataObject.Resolve(PdfName.Recipients);
}
byte[][] recipientFieldsBytes = new byte[array.Count][];
//TODO encryption.getRecipientsLength() and getRecipientStringAt() should be deprecated
int recipientFieldsLength = 0;
StringBuilder extraInfo = new StringBuilder();
for (int i = 0; i < array.Count; i++)
{
PdfString recipientFieldString = (PdfString)array.Resolve(i);
byte[] recipientBytes = recipientFieldString.GetBuffer();
CmsEnvelopedData data = new CmsEnvelopedData(recipientBytes);
var recipCertificatesIt = data.GetRecipientInfos().GetRecipients();
int j = 0;
foreach (RecipientInformation ri in recipCertificatesIt)
{
// Impl: if a matching certificate was previously found it is an error,
// here we just don't care about it
RecipientID rid = ri.RecipientID;
if (!foundRecipient && rid.Match(materialCert))
{
foundRecipient = true;
var privateKey = material.PrivateKey;
// might need to call setContentProvider() if we use PKI token, see
// http://bouncy-castle.1462172.n4.nabble.com/CMSException-exception-unwrapping-key-key-invalid-unknown-key-type-passed-to-RSA-td4658109.html
//DotNetUtilities.GetKeyPair(ri.AlgorithmIdentifier)
envelopedData = ri.GetContent(privateKey.Key);
break;
}
j++;
if (certificate != null)
{
extraInfo.Append('\n');
extraInfo.Append(j);
extraInfo.Append(": ");
if (ri is KeyTransRecipientInformation)
{
appendCertInfo(extraInfo, (KeyTransRecipientInformation)ri, certificate, materialCert);
}
}
}
recipientFieldsBytes[i] = recipientBytes;
recipientFieldsLength += recipientBytes.Length;
}
if (!foundRecipient || envelopedData == null)
{
throw new IOException("The certificate matches none of " + array.Count
+ " recipient entries" + extraInfo.ToString());
}
if (envelopedData.Length != 24)
{
throw new IOException("The enveloped data does not contain 24 bytes");
}
// now envelopedData contains:
// - the 20 bytes seed
// - the 4 bytes of permission for the current user
byte[] accessBytes = new byte[4];
Array.Copy(envelopedData, 20, accessBytes, 0, 4);
AccessPermission currentAccessPermission = new AccessPermission(accessBytes);
currentAccessPermission.IsReadOnly = true;
CurrentAccessPermission = currentAccessPermission;
// what we will put in the SHA1 = the seed + each byte contained in the recipients array
byte[] sha1Input = new byte[recipientFieldsLength + 20];
// put the seed in the sha1 input
Array.Copy(envelopedData, 0, sha1Input, 0, 20);
// put each bytes of the recipients array in the sha1 input
int sha1InputOffset = 20;
foreach (byte[] recipientFieldsByte in recipientFieldsBytes)
{
Array.Copy(recipientFieldsByte, 0, sha1Input, sha1InputOffset, recipientFieldsByte.Length);
sha1InputOffset += recipientFieldsByte.Length;
}
byte[] mdResult;
if (encryption.Version == 4 || encryption.Version == 5)
{
mdResult = SHA256.Create().Digest(sha1Input);
// detect whether AES encryption is used. This assumes that the encryption algo is
// stored in the PDCryptFilterDictionary
// However, crypt filters are used only when V is 4 or 5.
PdfCryptFilterDictionary defaultCryptFilterDictionary = encryption.DefaultCryptFilterDictionary;
if (defaultCryptFilterDictionary != null)
{
PdfName cryptFilterMethod = defaultCryptFilterDictionary.CryptFilterMethod;
IsAES = PdfName.AESV2.Equals(cryptFilterMethod) || PdfName.AESV3.Equals(cryptFilterMethod);
}
}
else
{
mdResult = SHA1.Create().Digest(sha1Input);
}
// we have the encryption key ...
encryptionKey = new byte[this.keyLength / 8];
Array.Copy(mdResult, 0, encryptionKey, 0, this.keyLength / 8);
}
catch (Exception e)
{
throw new IOException("", e);
}
}
public MimeEntity DecryptEntity(byte[] encryptedBytes, X509Certificate2 decryptingCertificate)
{
try
{
if (decryptingCertificate == null)
{
throw new EncryptionException(EncryptionError.NoCertificates);
}
// TODO: introduce buffering if you are using large files
// CMSEnvelopeData is a PKCS# structure rfc4134
var envelopedData = new CmsEnvelopedData(encryptedBytes);
var envData = EnvelopedData.GetInstance(envelopedData.ContentInfo.Content);
using (var session = GetSession())
{
if (session == null)
{
return(null);
}
foreach (Asn1Sequence asn1Set in envData.RecipientInfos)
{
var recip = RecipientInfo.GetInstance(asn1Set);
var keyTransRecipientInfo = KeyTransRecipientInfo.GetInstance(recip.Info);
var sessionKey = Pkcs11Util.Decrypt(session, keyTransRecipientInfo, decryptingCertificate);
#if DEBUG
Console.WriteLine(Asn1Dump.DumpAsString(envData));
#endif
if (sessionKey == null)
{
continue;
}
var recipientId = new RecipientID();
var issuerAndSerialNumber = (IssuerAndSerialNumber)keyTransRecipientInfo.RecipientIdentifier.ID;
recipientId.Issuer = issuerAndSerialNumber.Name;
recipientId.SerialNumber = issuerAndSerialNumber.SerialNumber.Value;
var recipientInformation = envelopedData.GetRecipientInfos().GetRecipients(recipientId);
var recipients = new ArrayList(recipientInformation);
//
// read the encrypted content info
//
var encInfo = envData.EncryptedContentInfo;
var encAlg = encInfo.ContentEncryptionAlgorithm;
var readable = new CmsProcessableByteArray(encInfo.EncryptedContent.GetOctets());
var keyParameter = ParameterUtilities.CreateKeyParameter(encAlg.Algorithm.Id, sessionKey);
// Todo: does this work with multi recipient?
foreach (RecipientInformation recipient in recipients)
{
var cmsReadable = GetReadable(keyParameter, encAlg, readable);
var cmsTypedStream = new CmsTypedStream(cmsReadable.GetInputStream());
var contentBytes = StreamToByteArray(cmsTypedStream.ContentStream);
var mimeEntity = MimeSerializer.Default.Deserialize <MimeEntity>(contentBytes);
return(mimeEntity);
}
}
}
}
catch (Exception ex)
{
Error.NotifyEvent(this, ex);
}
return(null);
}