/// <summary>
/// Gets a list of digest values from a signature element.
/// </summary>
/// <param name="signatureElem">Signature element.</param>
/// <returns>Map that contains reference Uri to digest values.</returns>
public IDictionary <string, byte[]> GetDigestValues(XmlElement signatureElem)
{
ArgumentUtils.CheckNotNull(signatureElem, "signatureElem");
if (!XmlUtils.CheckElement(signatureElem, SignatureElement,
SignedXml.XmlDsigNamespaceUrl))
{
throw new XspException("Element is not a 'ds:Signature' element");
}
// Load the signature
SignedXml signedXml = new SignedXml(signatureElem.OwnerDocument);
signedXml.LoadXml(signatureElem);
IDictionary <string, byte[]> digestValues = new Dictionary <string, byte[]>();
// Iterate through each reference and add it to the map
foreach (Reference signatureRef in signedXml.SignedInfo.References)
{
// Check the URI value is set
if (signatureRef.Uri == null || signatureRef.Uri.Length == 0)
{
throw new XspException("Signature reference does not contain a URI");
}
// Check the digest value exists
if (signatureRef.DigestValue == null)
{
throw new XspException("Signature reference does not contain a digest value");
}
digestValues.Add(signatureRef.Uri, signatureRef.DigestValue);
}
return(digestValues);
}
/// <summary>
/// Signs Xml data with a certificate and creates a signed payload container.
/// </summary>
/// <param name="payloadDoc">Document to sign.</param>
/// <param name="certificate">Certificate used to sign with.</param>
/// <returns>Signed container.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument Create(XmlDocument payloadDoc, X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNull(payloadDoc, "payloadDoc");
ArgumentUtils.CheckNotNull(certificate, "certificate");
return(Create(payloadDoc, new X509Certificate2Collection(certificate)));
}
/// <summary>
/// Checks a list of signatures.
/// </summary>
/// <param name="signatureElems">Signature elements.</param>
/// <param name="certificateVerifier">Certificate verifier.</param>
public void Check(IList <XmlElement> signatureElems,
ICertificateVerifier certificateVerifier)
{
ArgumentUtils.CheckNotNullNorEmpty(signatureElems, "signatureElems");
ArgumentUtils.CheckNotNull(certificateVerifier, "certificateVerifier");
// Check each signature
foreach (XmlElement signatureElem in signatureElems)
{
if (!XmlUtils.CheckElement(signatureElem, SignatureElement,
SignedXml.XmlDsigNamespaceUrl))
{
throw new XspException("Element is not a 'ds:Signature' element");
}
// Get the certificate from the 'KeyInfo' of the signature
X509Certificate2 certificate = GetCertificate(signatureElem);
// Verify the signature
if (!XmlSecurityUtils.Verify(signatureElem, certificate))
{
throw new XspException("Could not validate the signature");
}
// Verify the certificate
certificateVerifier.Verify(certificate);
}
}
/// <summary>
/// Decrypts an encrypted container document returning the payload.
/// </summary>
/// <param name="encryptedPayloadDoc">Encrypted container to decrypt.</param>
/// <param name="certificate">Certificate to decrypt with.</param>
/// <returns>Decrypted payload.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument GetData(XmlDocument encryptedPayloadDoc,
X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNull(encryptedPayloadDoc, "encryptedPayloadDoc");
ArgumentUtils.CheckNotNull(certificate, "certificate");
return(GetData(encryptedPayloadDoc.DocumentElement, certificate));
}
/// <summary>
/// Constructor that sets the Xml namespace and the signed
/// profile service implementation.
/// </summary>
/// <param name="signedPayloadXmlNs">Xml namespace of the
/// signed payload.
/// </param>
/// <param name="signedProfileService">Implementation of the signed
/// profile service.</param>
public SignedContainerProfileService(string signedPayloadXmlNs,
IXmlSignatureProfileService signedProfileService)
{
ArgumentUtils.CheckNotNull(signedPayloadXmlNs, "signedPayloadXmlNs");
ArgumentUtils.CheckNotNull(signedProfileService, "signedProfileService");
this.signedPayloadXmlNs = signedPayloadXmlNs;
this.signedProfileService = signedProfileService;
}
/// <summary>
/// Encrypts Xml data using multiple certificates and creates an encrypted
/// payload container.
/// </summary>
/// <param name="payloadDoc">Payload to encrypt.</param>
/// <param name="certificates">Certificates to encrypt with.</param>
/// <returns>Encrypted container Xml document.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument Create(XmlDocument payloadDoc,
X509Certificate2Collection certificates)
{
ArgumentUtils.CheckNotNull(payloadDoc, "payloadDoc");
ArgumentUtils.CheckNotNull(certificates, "certificates");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
return(Create(payloadDoc, certificates, null));
}
/// <summary>
/// Checks a signature.
/// </summary>
/// <param name="signatureElem">Signature element.</param>
/// <param name="certificateVerifier">Certificate verifier.</param>
public void Check(XmlElement signatureElem,
ICertificateVerifier certificateVerifier)
{
ArgumentUtils.CheckNotNull(signatureElem, "signatureElem");
ArgumentUtils.CheckNotNull(certificateVerifier, "certificateVerifier");
IList <XmlElement> signatureElems = new List <XmlElement>();
signatureElems.Add(signatureElem);
Check(signatureElems, certificateVerifier);
}
/// <summary>
/// Decrypts an element using the cipher key.
/// </summary>
/// <param name="encryptedDataElem">Element to decrypt.</param>
/// <param name="cipherKey">Cipher key.</param>
public void Decrypt(XmlElement encryptedDataElem, byte[] cipherKey)
{
ArgumentUtils.CheckNotNull(encryptedDataElem, "encryptedDataElem");
ArgumentUtils.CheckNotNull(cipherKey, "cipherKey");
IList <XmlElement> dataElems = new List <XmlElement>();
dataElems.Add(encryptedDataElem);
Decrypt(dataElems, cipherKey);
}
/// <summary>
/// Constructor that sets the Xml namespace and the encrypted
/// profile service implementation.
/// </summary>
/// <param name="encryptedPayloadXmlNs">Xml namespace of the
/// encrypted payload.
/// </param>
/// <param name="encryptedProfileService">Implementation of the encrypted
/// profile service.</param>
public EncryptedContainerProfileService(string encryptedPayloadXmlNs,
IXmlEncryptionProfileService encryptedProfileService)
{
ArgumentUtils.CheckNotNull(encryptedPayloadXmlNs,
"encryptedPayloadXmlNs");
ArgumentUtils.CheckNotNull(encryptedProfileService,
"encryptedProfileService");
this.encryptedPayloadXmlNs = encryptedPayloadXmlNs;
this.encryptedProfileService = encryptedProfileService;
}
/// <summary>
/// Signs an element.
/// </summary>
/// <param name="elementToAddToSigTo"></param>
/// <param name="elementToSign"></param>
/// <param name="certificates"></param>
public void Sign(XmlElement elementToAddToSigTo, XmlElement elementToSign,
X509Certificate2Collection certificates)
{
ArgumentUtils.CheckNotNull(elementToAddToSigTo, "elementToAddToSigTo");
ArgumentUtils.CheckNotNull(elementToSign, "elementToSign");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
IList <XmlElement> elementsToSign = new List <XmlElement>();
elementsToSign.Add(elementToSign);
Sign(elementToAddToSigTo, elementsToSign, certificates);
}
/// <summary>
/// Decrypts an element.
/// </summary>
/// <param name="encryptedKeyElems"></param>
/// <param name="encryptedDataElem"></param>
/// <param name="certificate"></param>
public void Decrypt(IList <XmlElement> encryptedKeyElems,
XmlElement encryptedDataElem, X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNullNorEmpty(encryptedKeyElems, "encryptedKeyElems");
ArgumentUtils.CheckNotNull(encryptedDataElem, "encryptedDataElem");
ArgumentUtils.CheckNotNull(certificate, "certificate");
IList <XmlElement> encryptedDataElems = new List <XmlElement>();
encryptedDataElems.Add(encryptedDataElem);
Decrypt(encryptedKeyElems, encryptedDataElems, certificate);
}
/// <summary>
/// Gets a list of digest values.
/// </summary>
/// <param name="containerDoc">Signed container.</param>
/// <returns>List of digest values.</returns>
public IList <byte[]> GetDigestValues(XmlDocument containerDoc)
{
ArgumentUtils.CheckNotNull(containerDoc, "containerDoc");
// Check the document is a signed container
if (!XmlUtils.CheckElement(containerDoc.DocumentElement, SignedPayloadElement,
this.signedPayloadXmlNs))
{
throw new ArgumentException("Document is not a signed container");
}
// Create the namespace manager for executing XPath statements
XmlNamespaceManager namespaceManager = CreateXmlNamespaceManager(
containerDoc);
// Get the list of signature elements
IList <XmlElement> signatureElems = XPathUtils.GetElements(containerDoc,
"/sp:signedPayload/sp:signatures/ds:Signature", namespaceManager);
if (signatureElems.Count == 0)
{
throw new XspException("No 'ds:Signature' elements were found within the " +
"'sp:signatures' element");
}
// Iterate through each signature to get the digest
IList <byte[]> digestList = new List <byte[]>();
foreach (XmlElement signatureElem in signatureElems)
{
// Extract the digest from the signature
IDictionary <string, byte[]> digestValues =
this.signedProfileService.GetDigestValues(signatureElem);
if (digestValues.Keys.Count == 0)
{
throw new XspException("Signature contains no refences");
}
if (digestValues.Keys.Count > 1)
{
throw new XspException("Signature contains more than one reference");
}
// Get the first value from the values list as there is only one
IEnumerator <byte[]> digestEnumerator =
digestValues.Values.GetEnumerator();
digestEnumerator.MoveNext();
digestList.Add(digestEnumerator.Current);
}
return(digestList);
}
/// <summary>
/// Signs a list of elements.
/// </summary>
/// <param name="elementToAddToSigTo"></param>
/// <param name="elementsToSign"></param>
/// <param name="certificate"></param>
public void Sign(XmlElement elementToAddToSigTo,
IList <XmlElement> elementsToSign, X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNull(elementToAddToSigTo, "elementToAddToSigTo");
ArgumentUtils.CheckNotNullNorEmpty(elementsToSign, "elementsToSign");
ArgumentUtils.CheckNotNull(certificate, "certificate");
X509Certificate2Collection certificates = new X509Certificate2Collection(
certificate);
Sign(elementToAddToSigTo, elementsToSign, certificates);
}
/// <summary>
/// Encrypts an element.
/// </summary>
/// <param name="elementToAddEncKeysTo"></param>
/// <param name="elementToEncrypt"></param>
/// <param name="certificates"></param>
public void Encrypt(XmlElement elementToAddEncKeysTo, XmlElement elementToEncrypt,
X509Certificate2Collection certificates)
{
ArgumentUtils.CheckNotNull(elementToAddEncKeysTo, "elementToAddEncKeysTo");
ArgumentUtils.CheckNotNull(elementToEncrypt, "elementToEncrypt");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
IList <XmlElement> elementsToEncrypt = new List <XmlElement>();
elementsToEncrypt.Add(elementToEncrypt);
Encrypt(elementToAddEncKeysTo, elementsToEncrypt, certificates);
}
/// <summary>
/// Gets the signing certificate.
/// </summary>
/// <param name="signatureElem">Signature element.</param>
/// <returns>Certificate used to create the signature.</returns>
public X509Certificate2 GetSigningCertificate(XmlElement signatureElem)
{
ArgumentUtils.CheckNotNull(signatureElem, "signatureElem");
if (!XmlUtils.CheckElement(signatureElem, SignatureElement,
SignedXml.XmlDsigNamespaceUrl))
{
throw new XspException("Element is not a 'ds:Signature' element");
}
// Get the certificate from the signature
return(GetCertificate(signatureElem));
}
/// <summary>
/// Encrypts a list of elements.
/// </summary>
/// <param name="elementToAddEncKeysTo"></param>
/// <param name="elementsToEncrypt"></param>
/// <param name="certificate"></param>
public void Encrypt(XmlElement elementToAddEncKeysTo,
IList <XmlElement> elementsToEncrypt, X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNull(elementToAddEncKeysTo, "elementToAddEncKeysTo");
ArgumentUtils.CheckNotNullNorEmpty(elementsToEncrypt, "elementsToEncrypt");
ArgumentUtils.CheckNotNull(certificate, "certificate");
X509Certificate2Collection certificates = new X509Certificate2Collection();
certificates.Add(certificate);
Encrypt(elementToAddEncKeysTo, elementsToEncrypt, certificates);
}
/// <summary>
/// Decrypts an encrypted container Xml element, returning the payload.
/// </summary>
/// <param name="encryptedPayloadElem">Encrypted container to decrypt.</param>
/// <param name="certificate">Certificate to decrypt with.</param>
/// <returns>Decrypted payload.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument GetData(XmlElement encryptedPayloadElem,
X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNull(encryptedPayloadElem, "encryptedPayloadElem");
ArgumentUtils.CheckNotNull(certificate, "certificate");
// Check the root element belongs to the right namespace
if (!XmlUtils.CheckElement(encryptedPayloadElem, EncryptedPayloadElement,
this.encryptedPayloadXmlNs))
{
throw new ArgumentException("Document is not an encrypted container");
}
// Clone the source element so it is not modified
XmlElement clonePayloadElem = XmlUtils.Clone(encryptedPayloadElem);
// Create a namespace manager for XPath
XmlNamespaceManager namespaceManager = CreateXmlNamespaceManager(
clonePayloadElem.OwnerDocument);
// Get the 'xenc:EncryptedData' element
XmlElement encryptedDataElem = XPathUtils.GetElement(clonePayloadElem,
"/ep:encryptedPayload/ep:encryptedPayloadData/xenc:EncryptedData",
namespaceManager);
if (encryptedDataElem == null)
{
throw new XspException("Encrypted data was not found within the container");
}
// Get the 'xenc:EncryptedKey' element list
IList <XmlElement> keyElems = XPathUtils.GetElements(clonePayloadElem,
"/ep:encryptedPayload/ep:keys/xenc:EncryptedKey", namespaceManager);
if (keyElems.Count == 0)
{
throw new XspException("No encrypted keys found within the container");
}
// Decrypt the data
this.encryptedProfileService.Decrypt(keyElems, encryptedDataElem,
certificate);
// Get the payload element
XmlElement payloadElem = XPathUtils.GetElement(clonePayloadElem,
"/ep:encryptedPayload/ep:encryptedPayloadData/*[1]", namespaceManager);
// Return the payload element within a new Xml document
return(XmlUtils.CreateXmlDocument(payloadElem));
}
/// <summary>
/// Encrypts Xml data using multiple certificates and creates an encrypted
/// payload container.
/// </summary>
/// <param name="payloadDoc">Payload to encrypt.</param>
/// <param name="certificates">Certificates to encrypt with.</param>
/// <param name="cipherKey">The cipher to use when encrypting the payload.</param>
/// <returns>Encrypted container Xml document.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument Create(XmlDocument payloadDoc, X509Certificate2Collection certificates, byte[] cipherKey)
{
ArgumentUtils.CheckNotNull(payloadDoc, "payloadDoc");
ArgumentUtils.CheckNotNull(certificates, "certificates");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
// Create an empty Xml document to hold the elements
XmlDocument containerDoc = XmlUtils.CreateXmlDocument();
// Create the 'ep:encryptedPayload' element
XmlElement rootElem =
containerDoc.CreateElement(EncryptedPayloadElement,
this.encryptedPayloadXmlNs);
containerDoc.AppendChild(rootElem);
// Create the 'ep:keys' element
XmlElement keysElem =
containerDoc.CreateElement(KeysElement,
this.encryptedPayloadXmlNs);
// Add the 'ep:keys' element to the 'ep:encryptedPayload' element
rootElem.AppendChild(keysElem);
// Create the 'ep:encryptedPayloadData' element
XmlElement dataElem =
containerDoc.CreateElement(EncryptedPayloadDataElement,
this.encryptedPayloadXmlNs);
// Add the 'ep:encryptedPayloadData' element to the 'ep:encryptedPayload'
// element
rootElem.AppendChild(dataElem);
// Add the payload to the data element
XmlNode payloadNode =
containerDoc.ImportNode(payloadDoc.DocumentElement, true);
dataElem.AppendChild(payloadNode);
// Perform the encryption
List <XmlElement> elementsToEncrypt = new List <XmlElement>();
elementsToEncrypt.Add((XmlElement)payloadNode);
this.encryptedProfileService.Encrypt(keysElem, elementsToEncrypt, certificates, cipherKey);
// Return the created container
return(containerDoc);
}
/// <summary>
/// Signs Xml data with multiple certificates and creates a signed payload container.
/// </summary>
/// <param name="payloadDoc">Document to sign.</param>
/// <param name="certificates">List of certificates used to sign with.</param>
/// <returns>Signed container.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument Create(XmlDocument payloadDoc,
X509Certificate2Collection certificates)
{
ArgumentUtils.CheckNotNull(payloadDoc, "payloadDoc");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
// Create the container
XmlDocument containerDoc = XmlUtils.CreateXmlDocument();
// Create the 'sp:signedPayload' root element of the container
XmlElement rootElem =
containerDoc.CreateElement(SignedPayloadElement,
this.signedPayloadXmlNs);
containerDoc.AppendChild(rootElem);
// Create the 'sp:signatures' element
XmlElement signaturesElem =
containerDoc.CreateElement(SignaturesElement,
this.signedPayloadXmlNs);
// Add the 'sp:signatures' to the 'sp:signedPayload' element
rootElem.AppendChild(signaturesElem);
// Create the 'sp:signedPayloadData' element
XmlElement dataElem =
containerDoc.CreateElement(SignedPayloadDataElement,
this.signedPayloadXmlNs);
// Add the data element 'sp:signedPayloadData' to 'sp:signedPayload' element
rootElem.AppendChild(dataElem);
// Add the payload data
XmlNode payloadNode = containerDoc.ImportNode(payloadDoc.DocumentElement, true);
dataElem.AppendChild(payloadNode);
// Add an 'id' attribute to the data element for use as a signing reference
// Make sure reference starts with an alpha char - 'Malformed message' error if starts with number
string referenceId = "Id_" + Guid.NewGuid().ToString();
XmlUtils.AddIdAttribute(dataElem, referenceId);
this.signedProfileService.Sign(signaturesElem, dataElem, certificates);
return(containerDoc);
}
/// <summary>
/// Checks the signatures in a signed payload container and also verifies the
/// certificates with the certificate verifier callback.
/// </summary>
/// <param name="containerDoc">Signed payload container.</param>
/// <param name="certificateVerifier">Certificate verifier.</param>
/// <exception cref="XspException">Thrown on error.</exception>
public void Check(XmlDocument containerDoc,
ICertificateVerifier certificateVerifier)
{
ArgumentUtils.CheckNotNull(containerDoc, "containerDoc");
ArgumentUtils.CheckNotNull(certificateVerifier, "certificateVerifier");
// Check the container is valid
CheckSignedContainer(containerDoc);
// Get all the signatures in the container
IList <XmlElement> signatureElems = XPathUtils.GetElements(containerDoc,
"/sp:signedPayload/sp:signatures/ds:Signature",
CreateXmlNamespaceManager(containerDoc));
// Check all the signatures verify
this.signedProfileService.Check(signatureElems, certificateVerifier);
}
/// <summary>
/// Decrypts an encrypted container document returning the payload.
/// </summary>
/// <param name="encryptedPayloadDoc">Encrypted container to decrypt.</param>
/// <param name="cipherKey">The cipher key to use to decrypt the document.</param>
/// <returns>Decrypted payload.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument GetData(XmlDocument encryptedPayloadDoc, byte[] cipherKey)
{
ArgumentUtils.CheckNotNull(encryptedPayloadDoc, "encryptedPayloadDoc");
ArgumentUtils.CheckNotNull(cipherKey, "cipherKey");
XmlElement docElement = encryptedPayloadDoc.DocumentElement;
// Check the root element belongs to the right namespace
if (!XmlUtils.CheckElement(docElement, EncryptedPayloadElement,
this.encryptedPayloadXmlNs))
{
throw new ArgumentException("Document is not an encrypted container");
}
// Clone the source element so it is not modified
XmlElement clonePayloadElem = XmlUtils.Clone(docElement);
// Create a namespace manager for XPath
XmlNamespaceManager namespaceManager = CreateXmlNamespaceManager(
clonePayloadElem.OwnerDocument);
// Get the 'xenc:EncryptedData' element
XmlElement encryptedDataElem = XPathUtils.GetElement(clonePayloadElem,
"/ep:encryptedPayload/ep:encryptedPayloadData/xenc:EncryptedData",
namespaceManager);
if (encryptedDataElem == null)
{
throw new XspException("Encrypted data was not found within the container");
}
// Decrypt the element with the cipher key
this.encryptedProfileService.Decrypt(encryptedDataElem, cipherKey);
// Get the payload element
XmlElement payloadElem = XPathUtils.GetElement(clonePayloadElem,
"/ep:encryptedPayload/ep:encryptedPayloadData/*[1]", namespaceManager);
// Return the payload element within a new Xml document
return(XmlUtils.CreateXmlDocument(payloadElem));
}
/// <summary>
/// Extracts the payload from the signed payload container.
/// </summary>
/// <param name="containerDoc">Signed payload container.</param>
/// <returns>Payload.</returns>
/// <exception cref="XspException">Thrown on error.</exception>
public XmlDocument GetData(XmlDocument containerDoc)
{
ArgumentUtils.CheckNotNull(containerDoc, "containerDoc");
// Check the document is a signed container
if (!XmlUtils.CheckElement(containerDoc.DocumentElement, SignedPayloadElement,
this.signedPayloadXmlNs))
{
throw new ArgumentException("Document is not a signed container");
}
// Create an Xml namespace manager for XPathing
XmlNamespaceManager namespaceManager = CreateXmlNamespaceManager(
containerDoc);
// Get the data from the container
XmlElement payloadDataElem = XPathUtils.GetElement(containerDoc,
"/sp:signedPayload/sp:signedPayloadData/*[1]", namespaceManager);
return(XmlUtils.CreateXmlDocument(payloadDataElem));
}
/// <summary>
/// Returns a list of certificates from the signed container.
/// </summary>
/// <param name="containerDoc">Signed container.</param>
/// <returns>List of certificates.</returns>
public IList <X509Certificate2> GetSigningCertificates(XmlDocument containerDoc)
{
ArgumentUtils.CheckNotNull(containerDoc, "containerDoc");
// Check the document is a signed container
if (!XmlUtils.CheckElement(containerDoc.DocumentElement, SignedPayloadElement,
this.signedPayloadXmlNs))
{
throw new ArgumentException("Document is not a signed container");
}
// Create the namespace manager for executing XPath statements
XmlNamespaceManager namespaceManager = CreateXmlNamespaceManager(
containerDoc);
// Get the list of signature elements
IList <XmlElement> signatureElems = XPathUtils.GetElements(containerDoc,
"/sp:signedPayload/sp:signatures/ds:Signature", namespaceManager);
if (signatureElems.Count == 0)
{
throw new XspException("No 'ds:Signature' elements were found " +
"within the 'sp:signatures' element");
}
IList <X509Certificate2> certs = new List <X509Certificate2>();
foreach (XmlElement signatureElem in signatureElems)
{
// Add each certificate
X509Certificate2 cert =
this.signedProfileService.GetSigningCertificate(signatureElem);
certs.Add(cert);
}
return(certs);
}
/// <summary>
/// Decrypts a list of elements using the cipher key.
/// </summary>
/// <param name="encryptedDataElems">Elements to decrypt.</param>
/// <param name="cipherKey">Cipher key.</param>
public void Decrypt(IList <XmlElement> encryptedDataElems, byte[] cipherKey)
{
ArgumentUtils.CheckNotNullNorEmpty(encryptedDataElems, "encryptedDataElems");
ArgumentUtils.CheckNotNull(cipherKey, "cipherKey");
// Decrypt the encrypted key
RijndaelManaged sessionKey = new RijndaelManaged();
sessionKey.Key = cipherKey;
// Decrypt each of the encrypted data elements using the decrypted key
foreach (XmlElement encryptedDataElem in encryptedDataElems)
{
// Decrypt the data
byte[] decryptedData = XmlSecurityUtils.Decrypt(encryptedDataElem, sessionKey);
XmlDocument containerDoc = encryptedDataElem.OwnerDocument;
// Replace the encrypted data with the decrypted data within the container
EncryptedXml encryptedXml = new EncryptedXml(containerDoc);
encryptedXml.ReplaceData(encryptedDataElem, decryptedData);
}
}
/// <summary>
/// Encrypts a list of elements.
/// </summary>
/// <param name="elementToAddEncKeysTo"></param>
/// <param name="elementsToEncrypt"></param>
/// <param name="certificates"></param>
/// <param name="cipherKey"></param>
public void Encrypt(XmlElement elementToAddEncKeysTo,
IList <XmlElement> elementsToEncrypt,
X509Certificate2Collection certificates, byte[] cipherKey)
{
ArgumentUtils.CheckNotNull(elementToAddEncKeysTo, "elementToAddEncKeysTo");
ArgumentUtils.CheckNotNullNorEmpty(elementsToEncrypt, "elementsToEncrypt");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
// Check all the elements to encrypt are not the same as the element
// to add the keys to and check they belong to the same document.
foreach (XmlElement elementToEncrypt in elementsToEncrypt)
{
if (elementToEncrypt == elementToAddEncKeysTo)
{
throw new XspException(
"Cannot add keys to an element that is being encrypted");
}
if (elementToAddEncKeysTo.OwnerDocument !=
elementToEncrypt.OwnerDocument)
{
throw new XspException(
"Elements to encrypt must belong to the same document as the " +
"keys element");
}
if (XmlUtils.IsDescendant(elementToEncrypt, elementToAddEncKeysTo))
{
throw new XspException(
"Element the keys are added to cannot be a child element of an " +
"element to encrypt");
}
}
// Get the container document
XmlDocument containerDoc = elementToAddEncKeysTo.OwnerDocument;
// Create a random session key
RijndaelManaged sessionKey = new RijndaelManaged();
sessionKey.KeySize = 256;
if (cipherKey != null)
{
sessionKey.Key = cipherKey;
}
IList <string> referenceIdList = new List <string>();
foreach (XmlElement elementToEncrypt in elementsToEncrypt)
{
// Generate a unique reference identifier
string referenceId = "_" + Guid.NewGuid().ToString();
// Add it to the reference list
referenceIdList.Add(referenceId);
// Create the encrypted data
EncryptedData encryptedData = XmlSecurityUtils.Encrypt(
sessionKey, elementToEncrypt, referenceId);
// Replace the original element with the encrypted data
EncryptedXml.ReplaceElement(elementToEncrypt, encryptedData, false);
}
foreach (X509Certificate2 certificate in certificates)
{
// Create the encrypted key
EncryptedKey encryptedKey = XmlSecurityUtils.CreateEncryptedKey(
sessionKey, certificate, referenceIdList);
// Import the encrypted key element into the container document
XmlNode encryptedKeyElem =
containerDoc.ImportNode(encryptedKey.GetXml(), true);
elementToAddEncKeysTo.AppendChild(encryptedKeyElem);
}
}
/// <summary>
/// Decrypts a list of elements.
/// </summary>
/// <param name="encryptedKeyElems">List of encrypted key elements.</param>
/// <param name="encryptedDataElems">List of encrypted data elements.</param>
/// <param name="certificate">Certificate to use for key decryption.</param>
public void Decrypt(IList <XmlElement> encryptedKeyElems,
IList <XmlElement> encryptedDataElems, X509Certificate2 certificate)
{
ArgumentUtils.CheckNotNullNorEmpty(encryptedKeyElems,
"encryptedKeyElems");
ArgumentUtils.CheckNotNullNorEmpty(encryptedDataElems,
"encryptedDataElems");
ArgumentUtils.CheckNotNull(certificate, "certificate");
// Check the certificate has a private key
if (certificate.PrivateKey == null)
{
throw new XspException("Certificate with subject '" +
certificate.Subject + "' does not contain a private key");
}
XmlDocument containerDoc = encryptedKeyElems[0].OwnerDocument;
// Check the 'encryptedKeyElems' elements
foreach (XmlElement encryptedKeyElem in encryptedKeyElems)
{
// Check they are all 'xenc:EncryptedKey' elements
if (!XmlUtils.CheckElement(encryptedKeyElem, EncryptedKeyTag,
EncryptedXml.XmlEncNamespaceUrl))
{
throw new XspException("Element within the keys list is not " +
"an 'xenc:EncryptedKey'");
}
// Check they all belong to the same document
if (encryptedKeyElem.OwnerDocument != containerDoc)
{
throw new XspException("All 'xenc:EncryptedKey' elements " +
"must belong to the same document");
}
}
// Check the 'encryptedDataElems' elements
foreach (XmlElement encryptedDataElem in encryptedDataElems)
{
// Check they are all 'xenc:EncryptedData' elements
if (!XmlUtils.CheckElement(encryptedDataElem, EncryptedDataTag,
EncryptedXml.XmlEncNamespaceUrl))
{
throw new XspException("Element within the encrypted data list is " +
"not an 'xenc:EncryptedData' element.");
}
// Check they all belong to the same document
if (encryptedDataElem.OwnerDocument != containerDoc)
{
throw new XspException("All 'xenc:EncryptedData' elements " +
"must belong to the same document");
}
}
// Attempt to find the matching encrypted key for the certificate
EncryptedKey encryptedKey = null;
foreach (XmlElement encryptedKeyElem in encryptedKeyElems)
{
EncryptedKey currentEncryptedKey = new EncryptedKey();
currentEncryptedKey.LoadXml(encryptedKeyElem);
// Check if the subject key identifier specified within the
// 'KeyInfo' of the encrypted key matches the certificate
if (MatchesCertificate(currentEncryptedKey, certificate))
{
encryptedKey = currentEncryptedKey;
break;
}
}
// Check if a key was found
if (encryptedKey == null)
{
throw new KeyMismatchException(
"Could not find a matching encrypted key for certificate '" +
certificate.Subject + "'.");
}
// Decrypt the encrypted key
RijndaelManaged sessionKey = new RijndaelManaged();
sessionKey.Key = XmlSecurityUtils.DecryptEncryptedKey(
encryptedKey, certificate.PrivateKey);
// Decrypt each of the encrypted data elements using the decrypted key
foreach (XmlElement encryptedDataElem in encryptedDataElems)
{
// Decrypt the data
byte[] decryptedData = XmlSecurityUtils.Decrypt(
encryptedDataElem, sessionKey);
// Replace the encrypted data with the decrypted data within the container
EncryptedXml encryptedXml = new EncryptedXml(containerDoc);
encryptedXml.ReplaceData(encryptedDataElem, decryptedData);
}
}
/// <summary>
/// Signs a list of elements.
/// </summary>
/// <param name="elementToAddToSigTo"></param>
/// <param name="elementsToSign"></param>
/// <param name="certificates"></param>
public void Sign(XmlElement elementToAddToSigTo,
IList <XmlElement> elementsToSign, X509Certificate2Collection certificates)
{
ArgumentUtils.CheckNotNull(elementToAddToSigTo, "elementToAddToSigTo");
ArgumentUtils.CheckNotNullNorEmpty(elementsToSign, "elementsToSign");
CertificateUtils.CheckNotNullOrEmpty(certificates, "certificates");
// Get the owner document
XmlDocument containerDoc = elementToAddToSigTo.OwnerDocument;
// Check each certificate has a private key
foreach (X509Certificate2 cert in certificates)
{
if (cert.PrivateKey == null)
{
throw new XspException("Certificate with subject '" +
cert.Subject + "' does not contain a private key");
}
}
// Check the 'elementsToSign' elements
foreach (XmlElement elementToSign in elementsToSign)
{
// Check an element to sign is not the same as the element where the
// signature will be added
if (elementToSign == elementToAddToSigTo)
{
throw new XspException("Cannot add the signature to an " +
"element being signed");
}
// Check if all elements have the same owner document
if (elementToSign.OwnerDocument != containerDoc)
{
throw new XspException("Element to sign must belong to the same " +
"document to where the signature is being added");
}
// Check the element to add the signature to is not a descendant
// of an element being signed
if (XmlUtils.IsDescendant(elementToSign, elementToAddToSigTo))
{
throw new XspException("Element to add the signature to cannot be " +
"a descendant of an element being signed");
}
}
// Create the reference list for signing
IList <string> referenceList = new List <string>();
foreach (XmlElement elementToSign in elementsToSign)
{
// Check if the element has an existing 'id' attribute
string referenceId = null;
IList <string> elemIdValues = GetIdValues(elementToSign);
if (elemIdValues.Count == 0)
{
// There is no 'id' element on the attribute so create one and add it
// Make sure reference starts with an alpha char - 'Malformed message' error if starts with number
referenceId = "Id_" + Guid.NewGuid().ToString();
XmlUtils.AddIdAttribute(elementToSign, referenceId);
}
else
{
// Set the signature reference 'id' to the existing one
referenceId = elemIdValues[0];
}
referenceList.Add(referenceId);
}
// Sign all the elements
foreach (X509Certificate2 certificate in certificates)
{
// Create the signature for the element
XmlElement signatureElem = XmlSecurityUtils.Sign(
containerDoc, certificate, referenceList);
// Append each created signature
elementToAddToSigTo.AppendChild(signatureElem);
}
}