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The following C# code example verifies a digital signature
that is located in a signed PDF document that is based on a PDF
file named LoanSigned.pdf. (See Verifying Digital Signatures.)
/**
* Ensure that you create a .NET project that uses
* MS Visual Studio 2008 and version 3.5 of the .NET
* framework. This is required to invoke a
* LiveCycle service using MTOM.
*
* For information, see "Invoking LiveCycle using MTOM" in Programming with LiveCycle
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.IO;
using VerifySignature.ServiceReference1;
namespace VerifySignature
{
class Program
{
static void Main(string[] args)
{
try
{
//Create a SignatureServiceClient object
SignatureServiceClient sigClient = new SignatureServiceClient();
sigClient.Endpoint.Address = new System.ServiceModel.EndpointAddress("http://hiro-xp:8080/soap/services/SignatureService?blob=mtom");
//Enable BASIC HTTP authentication
BasicHttpBinding b = (BasicHttpBinding)sigClient.Endpoint.Binding;
b.MessageEncoding = WSMessageEncoding.Mtom;
sigClient.ClientCredentials.UserName.UserName = "administrator";
sigClient.ClientCredentials.UserName.Password = "password";
b.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
b.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
b.MaxReceivedMessageSize = 2000000;
b.MaxBufferSize = 2000000;
b.ReaderQuotas.MaxArrayLength = 2000000;
//Create a BLOB instance to store a PDF document
BLOB inDoc = new BLOB();
//Specify a PDF document that contains the signature to verify
string path = "C:\\Adobe\LoanSigned.pdf";
FileStream fs = new FileStream(path, FileMode.Open);
//Get the length of the file stream
int len = (int)fs.Length;
byte[] ByteArray = new byte[len];
//Populate the byte array with the contents of the FileStream object
fs.Read(ByteArray, 0, len);
inDoc.MTOM = ByteArray;
//Specify the name of the Signature field
string fieldName = "SignatureField1";
//Create a PKIOptions object that contains PKI run-time options
PKIOptions pkiOptions = new PKIOptions();
pkiOptions.verificationTime = VerificationTime.CURRENT_TIME;
pkiOptions.revocationCheckStyle = RevocationCheckStyle.BestEffort;
//Verify the digital signature
PDFSignatureVerificationInfo signInfo = sigClient.verify2(
inDoc,
fieldName,
pkiOptions,
null);
//Get the Signature Status
SignatureStatus? sigStatus = signInfo.status;
String myStatus = "";
if (sigStatus == SignatureStatus.DynamicFormSignatureUnknown)
myStatus = "The signatures located in the dynamic PDF form are unknown";
else if (sigStatus == SignatureStatus.DocumentSignatureUnknown)
myStatus = "The signatures located in the PDF document are unknown";
else if (sigStatus == SignatureStatus.CertifiedDynamicFormSignatureTamper)
myStatus = "The signatures located in a certified PDF form are valid";
else if (sigStatus == SignatureStatus.SignedDynamicFormSignatureTamper)
myStatus = "The signatures located in a signed dynamic PDF form are valid";
else if (sigStatus == SignatureStatus.CertifiedDocumentSignatureTamper)
myStatus = "The signatures located in a certified PDF document are valid";
else if (sigStatus == SignatureStatus.SignedDocumentSignatureTamper)
myStatus = "The signatures located in a signed PDF document are valid";
else if (sigStatus == SignatureStatus.SignatureFormatError)
myStatus = "The format of a signature in a signed document is invalid";
else if (sigStatus == SignatureStatus.DynamicFormSigNoChanges)
myStatus = "No changes were made to the signed dynamic PDF form";
else if (sigStatus == SignatureStatus.DocumentSigNoChanges)
myStatus = "No changes were made to the signed PDF document";
else if (sigStatus == SignatureStatus.DynamicFormCertificationSigNoChanges)
myStatus = "No changes were made to the certified dynamic PDF form";
else if (sigStatus == SignatureStatus.DocumentCertificationSigNoChanges)
myStatus = "No changes were made to the certified PDF document";
else if (sigStatus == SignatureStatus.DocSigWithChanges)
myStatus = "There were changes to a signed PDF document";
else if (sigStatus == SignatureStatus.CertificationSigWithChanges)
myStatus = "There were changes made to the PDF document.";
//Get the signature type
SignatureType sigType = signInfo.signatureType;
String myType = "";
if (sigType.type == PDFSignatureType.AUTHORSIG)
myType = "Certification";
else if (sigType.type == PDFSignatureType.RECIPIENTSIG)
myType = "Recipient";
//Get the identity of the signer
IdentityInformation signerId = signInfo.signer;
String signerMsg = "";
if (signerId.status == IdentityStatus.UNKNOWN)
signerMsg = "Identity Unknown";
else if (signerId.status == IdentityStatus.TRUSTED)
signerMsg = "Identity Trusted";
else if (signerId.status == IdentityStatus.NOTTRUSTED)
signerMsg = "Identity Not Trusted";
Console.Write("The status of the signature is: " + myStatus + ". The signer identity is " + signerMsg + ". The signature type is " + myType + ".");
}
catch (Exception ee)
{
Console.WriteLine(ee.Message);
}
}
}
}
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