1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
| using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Net;
using System.Collections;
using System.Security.Cryptography.X509Certificates;
/*Bouncy castle*/
using Org.BouncyCastle.Ocsp;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Tls;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Ocsp;
using Org.BouncyCastle.Utilities.Encoders;
using Org.BouncyCastle.X509;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ X509Store store = new X509Store(StoreName.My);
store.Open(OpenFlags.ReadOnly);
X509CertificateCollection certificates =
X509Certificate2UI.SelectFromCollection
(
store.Certificates,
"Liste des certificats",
"Veuillez sélectionner un certificat",
X509SelectionFlag.SingleSelection
);
//Close certificate store
store.Close();
//Retrieve selected certificate
if (certificates.Count == 0) //the user has caceled shoosing certificate
{
return;
}
X509Certificate2 certificate = (X509Certificate2)certificates[0];
//Convert X509Certificate2 to Org.BouncyCastle.X509.X509Certificate
X509CertificateParser certParser = new X509CertificateParser();
Org.BouncyCastle.X509.X509Certificate CertBouncy = certParser.ReadCertificate(certificate.RawData);
//FileStream fs = new FileStream(@"C:\AV.cer",FileMode.Open);
//Org.BouncyCastle.X509.X509Certificate CertBouncy = certParser.ReadCertificate(fs);
DoOcspRequest(new Uri("http://ocsp.eid.belgium.be"), CertBouncy.SerialNumber, CertBouncy);
}
private static byte[] getOcspPackage(BigInteger serialNr, Org.BouncyCastle.X509.X509Certificate cacert)
{
OcspReqGenerator gen = new OcspReqGenerator();
try {
CertificateID certId = new CertificateID(CertificateID.HashSha1, cacert, serialNr);
gen.AddRequest(certId);
gen.SetRequestExtensions(getExtentions());
OcspReq req;
req = gen.Generate();
return req.GetEncoded();
} catch (OcspException e) {
System.Console.WriteLine(e.Message);
} catch (IOException e) {
System.Console.WriteLine(e.Message);
}
return null;
}
private static X509Extensions getExtentions() {
byte[] nonce = new byte[16];
Hashtable exts = new Hashtable();
Org.BouncyCastle.Asn1.X509.X509Extension nonceext = new Org.BouncyCastle.Asn1.X509.X509Extension(false,new DerOctetString(nonce));
exts.Add(OcspObjectIdentifiers.PkixOcspNonce, nonceext);
return new X509Extensions(exts);
}
private byte[] DoOcspRequest(Uri uri, BigInteger serialNr, Org.BouncyCastle.X509.X509Certificate certificate)
{
byte[] response = null;
HttpWebRequest webRequest = null;
try
{
webRequest = (HttpWebRequest)WebRequest.Create(uri);
//Setting required HTTP Headers
webRequest.ContentType = "application/ocsp-request";
//webRequest.Accept = "application/ocsp-response";
webRequest.Method = "POST";
byte[] ocspPackage = getOcspPackage(serialNr, certificate);
webRequest.ContentLength = ocspPackage.Length;
//webRequest.KeepAlive = true;
Stream s = webRequest.GetRequestStream();
s.Write(ocspPackage, 0, ocspPackage.Length);
//Getting the response
HttpWebResponse res = (HttpWebResponse)webRequest.GetResponse();
//reading Content-Length Header
long contentLength = res.ContentLength;//normally about 3100 bytes
OcspResp OcspResponse = new OcspResp(res.GetResponseStream());
string statusOcsp = getOcspResponseStatus(OcspResponse.Status);
System.Console.WriteLine(statusOcsp);
BasicOcspResp brep;
brep = (BasicOcspResp)OcspResponse.GetResponseObject();
SingleResp[] singleResps = brep.Responses;
SingleResp singleResp = singleResps[0];
Object status = singleResp.GetCertStatus();
s.Close();
}
catch (Exception ex)
{
//exceptionhandling
}
return response;
}
private static string getOcspResponseStatus(int status)
{
string OcspResponseStatus = "";
switch (status)
{
case 0: OcspResponseStatus = "succesfull";
break;
case 1: OcspResponseStatus = "malformedRequest";
break;
case 2: OcspResponseStatus = "internalError";
break;
case 3: OcspResponseStatus = "tryLater";
break;
case 5: OcspResponseStatus = "sigRequired";
break;
case 6: OcspResponseStatus = "unauthorized";
break;
}
return OcspResponseStatus;
}
private static void getOcspResponse(Stream sResponse)
{
try
{
OcspResp response = new OcspResp(sResponse);
BasicOcspResp brep;
brep = (BasicOcspResp)response.GetResponseObject();
SingleResp[] singleResps = brep.Responses;
SingleResp singleResp = singleResps[0];
Object status = singleResp.GetCertStatus();
if (status == null)
{
System.Console.WriteLine("OCSP Response is GOOD");
}
else
{
System.Console.WriteLine("OCSP Response is REVOKED or UNKNOW");
}
}
catch (Exception e)
{
System.Console.WriteLine(e.Message);
}
} |
