/**
* Signs the document using the detached mode, CMS or CAdES equivalent.
* @param sap the PdfSignatureAppearance
* @param externalSignature the interface providing the actual signing
* @param chain the certificate chain
* @param crlList the CRL list
* @param ocspClient the OCSP client
* @param tsaClient the Timestamp client
* @param provider the provider or null
* @param estimatedSize the reserved size for the signature. It will be estimated if 0
* @param cades true to sign CAdES equivalent PAdES-BES, false to sign CMS
* @throws DocumentException
* @throws IOException
* @throws GeneralSecurityException
* @throws NoSuchAlgorithmException
* @throws Exception
*/
public static void SignDetached(PdfSignatureAppearance sap, IExternalSignature externalSignature, ICollection<X509Certificate> chain, ICollection<ICrlClient> crlList, IOcspClient ocspClient,
ITSAClient tsaClient, int estimatedSize, CryptoStandard sigtype) {
List<X509Certificate> certa = new List<X509Certificate>(chain);
ICollection<byte[]> crlBytes = null;
int i = 0;
while (crlBytes == null && i < certa.Count)
crlBytes = ProcessCrl(certa[i++], crlList);
if (estimatedSize == 0) {
estimatedSize = 8192;
if (crlBytes != null) {
foreach (byte[] element in crlBytes) {
estimatedSize += element.Length + 10;
}
}
if (ocspClient != null)
estimatedSize += 4192;
if (tsaClient != null)
estimatedSize += 4192;
}
sap.Certificate = certa[0];
if(sigtype == CryptoStandard.CADES)
sap.AddDeveloperExtension(PdfDeveloperExtension.ESIC_1_7_EXTENSIONLEVEL2);
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, sigtype == CryptoStandard.CADES ? PdfName.ETSI_CADES_DETACHED : PdfName.ADBE_PKCS7_DETACHED);
dic.Reason = sap.Reason;
dic.Location = sap.Location;
dic.SignatureCreator = sap.SignatureCreator;
dic.Contact = sap.Contact;
dic.Date = new PdfDate(sap.SignDate); // time-stamp will over-rule this
sap.CryptoDictionary = dic;
Dictionary<PdfName, int> exc = new Dictionary<PdfName, int>();
exc[PdfName.CONTENTS] = estimatedSize * 2 + 2;
sap.PreClose(exc);
String hashAlgorithm = externalSignature.GetHashAlgorithm();
PdfPKCS7 sgn = new PdfPKCS7(null, chain, hashAlgorithm, false);
IDigest messageDigest = DigestUtilities.GetDigest(hashAlgorithm);
Stream data = sap.GetRangeStream();
byte[] hash = DigestAlgorithms.Digest(data, hashAlgorithm);
DateTime cal = DateTime.Now;
byte[] ocsp = null;
if (chain.Count >= 2 && ocspClient != null) {
ocsp = ocspClient.GetEncoded(certa[0], certa[1], null);
}
byte[] sh = sgn.getAuthenticatedAttributeBytes(hash, cal, ocsp, crlBytes, sigtype);
byte[] extSignature = externalSignature.Sign(sh);
sgn.SetExternalDigest(extSignature, null, externalSignature.GetEncryptionAlgorithm());
byte[] encodedSig = sgn.GetEncodedPKCS7(hash, cal, tsaClient, ocsp, crlBytes, sigtype);
if (estimatedSize < encodedSig.Length)
throw new IOException("Not enough space");
byte[] paddedSig = new byte[estimatedSize];
System.Array.Copy(encodedSig, 0, paddedSig, 0, encodedSig.Length);
PdfDictionary dic2 = new PdfDictionary();
dic2.Put(PdfName.CONTENTS, new PdfString(paddedSig).SetHexWriting(true));
sap.Close(dic2);
}
private static void Sign(XmlElement signature, IXmlLocator xmlLocator, IExternalSignature externalSignature,
List <XmlElement> references, XmlElement dsObject, KeyInfoClause keyInfo)
{
XmlDocument originalDoc = xmlLocator.GetDocument();
if (signature == null)
{
throw new InvalidOperationException();
}
XmlElement signedInfo = originalDoc.CreateElement("SignedInfo", SecurityConstants.XMLDSIG_URI);
signature.AppendChild(signedInfo);
XmlElement canonicalizationMethod = originalDoc.CreateElement("CanonicalizationMethod", SecurityConstants.XMLDSIG_URI);
canonicalizationMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_C14N);
signedInfo.AppendChild(canonicalizationMethod);
XmlElement signatureMethod = originalDoc.CreateElement("SignatureMethod", SecurityConstants.XMLDSIG_URI);
if (externalSignature.GetEncryptionAlgorithm().Equals(SecurityConstants.RSA))
{
signatureMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_RSA_SHA1);
}
else if (externalSignature.GetEncryptionAlgorithm().Equals(SecurityConstants.DSA))
{
signatureMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_DSA_SHA1);
}
signedInfo.AppendChild(signatureMethod);
foreach (XmlElement reference in references)
{
signedInfo.AppendChild(reference);
}
//if append Signature to original document upper - reference digest will be incorrect.
originalDoc.DocumentElement.AppendChild(signature);
XmlElement signedInfoDigest = (XmlElement)signedInfo.CloneNode(true);
NormalizeNamespaces(signedInfo.CreateNavigator(), signedInfoDigest.CreateNavigator());
XmlDocument signedInfoDoc = new XmlDocument(originalDoc.NameTable);
signedInfoDoc.LoadXml(signedInfoDigest.OuterXml);
byte[] byteRange = CalculateC14nByteRange(signedInfoDoc);
//Sign with ExternalSignature
String valueBase64 = Convert.ToBase64String(externalSignature.Sign(byteRange));
XmlElement signatureValue = originalDoc.CreateElement("SignatureValue", SecurityConstants.XMLDSIG_URI);
signatureValue.AppendChild(originalDoc.CreateTextNode(valueBase64));
signature.AppendChild(signatureValue);
if (keyInfo != null)
{
XmlElement keyInfoElement = originalDoc.CreateElement("KeyInfo", SecurityConstants.XMLDSIG_URI);
keyInfoElement.AppendChild(originalDoc.ImportNode(keyInfo.GetXml(), true));
signature.AppendChild(keyInfoElement);
}
if (dsObject != null)
{
signature.AppendChild(dsObject);
}
xmlLocator.SetDocument(originalDoc);
}
/**
* Signs the document using the detached mode, CMS or CAdES equivalent.
* @param sap the PdfSignatureAppearance
* @param externalSignature the interface providing the actual signing
* @param chain the certificate chain
* @param crlList the CRL list
* @param ocspClient the OCSP client
* @param tsaClient the Timestamp client
* @param provider the provider or null
* @param estimatedSize the reserved size for the signature. It will be estimated if 0
* @param cades true to sign CAdES equivalent PAdES-BES, false to sign CMS
* @throws DocumentException
* @throws IOException
* @throws GeneralSecurityException
* @throws NoSuchAlgorithmException
* @throws Exception
*/
public static void SignDetached(PdfSignatureAppearance sap, IExternalSignature externalSignature, ICollection <X509Certificate> chain, ICollection <ICrlClient> crlList, IOcspClient ocspClient,
ITSAClient tsaClient, int estimatedSize, CryptoStandard sigtype)
{
List <X509Certificate> certa = new List <X509Certificate>(chain);
ICollection <byte[]> crlBytes = null;
int i = 0;
while (crlBytes == null && i < certa.Count)
{
crlBytes = ProcessCrl(certa[i++], crlList);
}
if (estimatedSize == 0)
{
estimatedSize = 8192;
if (crlBytes != null)
{
foreach (byte[] element in crlBytes)
{
estimatedSize += element.Length + 10;
}
}
if (ocspClient != null)
{
estimatedSize += 4192;
}
if (tsaClient != null)
{
estimatedSize += 4192;
}
}
sap.Certificate = certa[0];
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, sigtype == CryptoStandard.CADES ? PdfName.ETSI_CADES_DETACHED : PdfName.ADBE_PKCS7_DETACHED);
dic.Reason = sap.Reason;
dic.Location = sap.Location;
dic.Contact = sap.Contact;
dic.Date = new PdfDate(sap.SignDate); // time-stamp will over-rule this
sap.CryptoDictionary = dic;
Dictionary <PdfName, int> exc = new Dictionary <PdfName, int>();
exc[PdfName.CONTENTS] = estimatedSize * 2 + 2;
sap.PreClose(exc);
String hashAlgorithm = externalSignature.GetHashAlgorithm();
PdfPKCS7 sgn = new PdfPKCS7(null, chain, hashAlgorithm, false);
IDigest messageDigest = DigestUtilities.GetDigest(hashAlgorithm);
Stream data = sap.GetRangeStream();
byte[] hash = DigestAlgorithms.Digest(data, hashAlgorithm);
DateTime cal = DateTime.Now;
byte[] ocsp = null;
if (chain.Count >= 2 && ocspClient != null)
{
ocsp = ocspClient.GetEncoded(certa[0], certa[1], null);
}
byte[] sh = sgn.getAuthenticatedAttributeBytes(hash, cal, ocsp, crlBytes, sigtype);
byte[] extSignature = externalSignature.Sign(sh);
sgn.SetExternalDigest(extSignature, null, externalSignature.GetEncryptionAlgorithm());
byte[] encodedSig = sgn.GetEncodedPKCS7(hash, cal, tsaClient, ocsp, crlBytes, sigtype);
if (estimatedSize + 2 < encodedSig.Length)
{
throw new IOException("Not enough space");
}
byte[] paddedSig = new byte[estimatedSize];
System.Array.Copy(encodedSig, 0, paddedSig, 0, encodedSig.Length);
PdfDictionary dic2 = new PdfDictionary();
dic2.Put(PdfName.CONTENTS, new PdfString(paddedSig).SetHexWriting(true));
sap.Close(dic2);
}
private static void Sign(XmlElement signature, IXmlLocator xmlLocator, IExternalSignature externalSignature,
List<XmlElement> references, XmlElement dsObject, KeyInfoClause keyInfo) {
XmlDocument originalDoc = xmlLocator.GetDocument();
if (signature == null)
throw new InvalidOperationException();
XmlElement signedInfo = originalDoc.CreateElement("SignedInfo", SecurityConstants.XMLDSIG_URI);
signature.AppendChild(signedInfo);
XmlElement canonicalizationMethod = originalDoc.CreateElement("CanonicalizationMethod", SecurityConstants.XMLDSIG_URI);
canonicalizationMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_C14N);
signedInfo.AppendChild(canonicalizationMethod);
XmlElement signatureMethod = originalDoc.CreateElement("SignatureMethod", SecurityConstants.XMLDSIG_URI);
if(externalSignature.GetEncryptionAlgorithm().Equals(SecurityConstants.RSA))
signatureMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_RSA_SHA1);
else if(externalSignature.GetEncryptionAlgorithm().Equals(SecurityConstants.DSA))
signatureMethod.SetAttribute("Algorithm", SecurityConstants.XMLDSIG_URI_DSA_SHA1);
signedInfo.AppendChild(signatureMethod);
foreach (XmlElement reference in references)
signedInfo.AppendChild(reference);
//if append Signature to original document upper - reference digest will be incorrect.
originalDoc.DocumentElement.AppendChild(signature);
XmlElement signedInfoDigest = (XmlElement)signedInfo.CloneNode(true);
NormalizeNamespaces(signedInfo.CreateNavigator(), signedInfoDigest.CreateNavigator());
XmlDocument signedInfoDoc = new XmlDocument(originalDoc.NameTable);
signedInfoDoc.LoadXml(signedInfoDigest.OuterXml);
byte[] byteRange = CalculateC14nByteRange(signedInfoDoc);
//Sign with ExternalSignature
String valueBase64 = Convert.ToBase64String(externalSignature.Sign(byteRange));
XmlElement signatureValue = originalDoc.CreateElement("SignatureValue", SecurityConstants.XMLDSIG_URI);
signatureValue.AppendChild(originalDoc.CreateTextNode(valueBase64));
signature.AppendChild(signatureValue);
if(keyInfo != null) {
XmlElement keyInfoElement = originalDoc.CreateElement("KeyInfo", SecurityConstants.XMLDSIG_URI);
keyInfoElement.AppendChild(originalDoc.ImportNode(keyInfo.GetXml(), true));
signature.AppendChild(keyInfoElement);
}
if (dsObject != null)
signature.AppendChild(dsObject);
xmlLocator.SetDocument(originalDoc);
}
/// <summary>Signs the document using the detached mode, CMS or CAdES equivalent.</summary>
/// <remarks>
/// Signs the document using the detached mode, CMS or CAdES equivalent.
/// <br /><br />
/// NOTE: This method closes the underlying pdf document. This means, that current instance
/// of PdfSigner cannot be used after this method call.
/// </remarks>
/// <param name="externalSignature">the interface providing the actual signing</param>
/// <param name="chain">the certificate chain</param>
/// <param name="crlList">the CRL list</param>
/// <param name="ocspClient">the OCSP client</param>
/// <param name="tsaClient">the Timestamp client</param>
/// <param name="externalDigest">an implementation that provides the digest</param>
/// <param name="estimatedSize">the reserved size for the signature. It will be estimated if 0</param>
/// <param name="sigtype">Either Signature.CMS or Signature.CADES</param>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.BouncyCastle.Security.GeneralSecurityException"/>
public virtual void SignDetached(IExternalSignature externalSignature, X509Certificate[] chain, ICollection
<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard
sigtype)
{
if (closed)
{
throw new PdfException(PdfException.ThisInstanceOfPdfSignerAlreadyClosed);
}
ICollection <byte[]> crlBytes = null;
int i = 0;
while (crlBytes == null && i < chain.Length)
{
crlBytes = ProcessCrl(chain[i++], crlList);
}
if (estimatedSize == 0)
{
estimatedSize = 8192;
if (crlBytes != null)
{
foreach (byte[] element in crlBytes)
{
estimatedSize += element.Length + 10;
}
}
if (ocspClient != null)
{
estimatedSize += 4192;
}
if (tsaClient != null)
{
estimatedSize += 4192;
}
}
PdfSignatureAppearance appearance = GetSignatureAppearance();
appearance.SetCertificate(chain[0]);
if (sigtype == PdfSigner.CryptoStandard.CADES)
{
AddDeveloperExtension(PdfDeveloperExtension.ESIC_1_7_EXTENSIONLEVEL2);
}
PdfSignature dic = new PdfSignature(PdfName.Adobe_PPKLite, sigtype == PdfSigner.CryptoStandard.CADES ? PdfName
.ETSI_CAdES_DETACHED : PdfName.Adbe_pkcs7_detached);
dic.SetReason(appearance.GetReason());
dic.SetLocation(appearance.GetLocation());
dic.SetSignatureCreator(appearance.GetSignatureCreator());
dic.SetContact(appearance.GetContact());
dic.SetDate(new PdfDate(GetSignDate()));
// time-stamp will over-rule this
cryptoDictionary = dic;
IDictionary <PdfName, int?> exc = new Dictionary <PdfName, int?>();
exc[PdfName.Contents] = estimatedSize * 2 + 2;
PreClose(exc);
String hashAlgorithm = externalSignature.GetHashAlgorithm();
PdfPKCS7 sgn = new PdfPKCS7((ICipherParameters)null, chain, hashAlgorithm, false);
Stream data = GetRangeStream();
byte[] hash = DigestAlgorithms.Digest(data, SignUtils.GetMessageDigest(hashAlgorithm));
byte[] ocsp = null;
if (chain.Length >= 2 && ocspClient != null)
{
ocsp = ocspClient.GetEncoded((X509Certificate)chain[0], (X509Certificate)chain[1], null);
}
byte[] sh = sgn.GetAuthenticatedAttributeBytes(hash, ocsp, crlBytes, sigtype);
byte[] extSignature = externalSignature.Sign(sh);
sgn.SetExternalDigest(extSignature, null, externalSignature.GetEncryptionAlgorithm());
byte[] encodedSig = sgn.GetEncodedPKCS7(hash, tsaClient, ocsp, crlBytes, sigtype);
if (estimatedSize < encodedSig.Length)
{
throw new System.IO.IOException("Not enough space");
}
byte[] paddedSig = new byte[estimatedSize];
System.Array.Copy(encodedSig, 0, paddedSig, 0, encodedSig.Length);
PdfDictionary dic2 = new PdfDictionary();
dic2.Put(PdfName.Contents, new PdfString(paddedSig).SetHexWriting(true));
Close(dic2);
closed = true;
}