2 // X509Certificates.cs: Handles X.509 certificates.
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Runtime.Serialization;
32 using System.Security.Cryptography;
33 using SSCX = System.Security.Cryptography.X509Certificates;
34 using System.Security.Permissions;
37 namespace Mono.Security.X509 {
40 // a. Internet X.509 Public Key Infrastructure Certificate and CRL Profile
41 // http://www.ietf.org/rfc/rfc3280.txt
42 // b. ITU ASN.1 standards (free download)
43 // http://www.itu.int/ITU-T/studygroups/com17/languages/
46 internal class X509Certificate : ISerializable {
48 public class X509Certificate : ISerializable {
50 public class X509Certificate {
55 private byte[] m_encodedcert;
56 private DateTime m_from;
57 private DateTime m_until;
59 private string m_issuername;
60 private string m_keyalgo;
61 private byte[] m_keyalgoparams;
63 private string m_subject;
64 private byte[] m_publickey;
65 private byte[] signature;
66 private string m_signaturealgo;
67 private byte[] m_signaturealgoparams;
68 private byte[] certhash;
72 // from http://www.ietf.org/rfc/rfc2459.txt
74 //Certificate ::= SEQUENCE {
75 // tbsCertificate TBSCertificate,
76 // signatureAlgorithm AlgorithmIdentifier,
77 // signature BIT STRING }
79 //TBSCertificate ::= SEQUENCE {
80 // version [0] Version DEFAULT v1,
81 // serialNumber CertificateSerialNumber,
82 // signature AlgorithmIdentifier,
86 // subjectPublicKeyInfo SubjectPublicKeyInfo,
87 // issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
88 // -- If present, version shall be v2 or v3
89 // subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
90 // -- If present, version shall be v2 or v3
91 // extensions [3] Extensions OPTIONAL
92 // -- If present, version shall be v3 -- }
94 private byte[] serialnumber;
96 // private byte[] issuerUniqueID;
97 // private byte[] subjectUniqueID;
98 private X509ExtensionCollection extensions;
101 private const bool reversed = true;
103 private const bool reversed = false;
106 // that's were the real job is!
107 private void Parse (byte[] data)
109 string e = "Input data cannot be coded as a valid certificate.";
111 decoder = new ASN1 (data);
113 if (decoder.Tag != 0x30)
114 throw new CryptographicException (e);
115 // Certificate / TBSCertificate
116 if (decoder [0].Tag != 0x30)
117 throw new CryptographicException (e);
119 ASN1 tbsCertificate = decoder [0];
122 // Certificate / TBSCertificate / Version
123 ASN1 v = decoder [0][tbs];
124 version = 1; // DEFAULT v1
125 if ((v.Tag == 0xA0) && (v.Count > 0)) {
126 // version (optional) is present only in v2+ certs
127 version += v [0].Value [0]; // zero based
131 // Certificate / TBSCertificate / CertificateSerialNumber
132 ASN1 sn = decoder [0][tbs++];
134 throw new CryptographicException (e);
135 serialnumber = sn.Value;
136 Array.Reverse (serialnumber, 0, serialnumber.Length);
138 // Certificate / TBSCertificate / AlgorithmIdentifier
140 // ASN1 signatureAlgo = tbsCertificate.Element (tbs++, 0x30);
142 issuer = tbsCertificate.Element (tbs++, 0x30);
143 m_issuername = X501.ToString (issuer);
145 ASN1 validity = tbsCertificate.Element (tbs++, 0x30);
146 ASN1 notBefore = validity [0];
147 m_from = ASN1Convert.ToDateTime (notBefore);
148 ASN1 notAfter = validity [1];
149 m_until = ASN1Convert.ToDateTime (notAfter);
151 subject = tbsCertificate.Element (tbs++, 0x30);
152 m_subject = X501.ToString (subject);
154 ASN1 subjectPublicKeyInfo = tbsCertificate.Element (tbs++, 0x30);
156 ASN1 algorithm = subjectPublicKeyInfo.Element (0, 0x30);
157 ASN1 algo = algorithm.Element (0, 0x06);
158 m_keyalgo = ASN1Convert.ToOid (algo);
159 // parameters ANY DEFINED BY algorithm OPTIONAL
160 // so we dont ask for a specific (Element) type and return DER
161 ASN1 parameters = algorithm [1];
162 m_keyalgoparams = ((algorithm.Count > 1) ? parameters.GetBytes () : null);
164 ASN1 subjectPublicKey = subjectPublicKeyInfo.Element (1, 0x03);
165 // we must drop th first byte (which is the number of unused bits
167 int n = subjectPublicKey.Length - 1;
168 m_publickey = new byte [n];
169 Buffer.BlockCopy (subjectPublicKey.Value, 1, m_publickey, 0, n);
171 // signature processing
172 byte[] bitstring = decoder [2].Value;
173 // first byte contains unused bits in first byte
174 signature = new byte [bitstring.Length - 1];
175 Buffer.BlockCopy (bitstring, 1, signature, 0, signature.Length);
177 algorithm = decoder [1];
178 algo = algorithm.Element (0, 0x06);
179 m_signaturealgo = ASN1Convert.ToOid (algo);
180 parameters = algorithm [1];
181 if (parameters != null)
182 m_signaturealgoparams = parameters.GetBytes ();
184 m_signaturealgoparams = null;
186 // Certificate / TBSCertificate / issuerUniqueID
187 ASN1 issuerUID = tbsCertificate.Element (tbs, 0xA1);
188 if (issuerUID != null) {
190 // issuerUniqueID = issuerUID.Value;
193 // Certificate / TBSCertificate / subjectUniqueID
194 ASN1 subjectUID = tbsCertificate.Element (tbs, 0xA2);
195 if (subjectUID != null) {
197 // subjectUniqueID = subjectUID.Value;
200 // Certificate / TBSCertificate / Extensions
201 ASN1 extns = tbsCertificate.Element (tbs, 0xA3);
202 if ((extns != null) && (extns.Count == 1))
203 extensions = new X509ExtensionCollection (extns [0]);
205 extensions = new X509ExtensionCollection (null);
207 // keep a copy of the original data
208 m_encodedcert = (byte[]) data.Clone ();
210 catch (Exception ex) {
211 throw new CryptographicException (e, ex);
217 public X509Certificate (byte[] data)
223 private byte[] GetUnsignedBigInteger (byte[] integer)
225 if (integer [0] == 0x00) {
226 // this first byte is added so we're sure it's an unsigned integer
227 // however we can't feed it into RSAParameters or DSAParameters
228 int length = integer.Length - 1;
229 byte[] uinteger = new byte [length];
230 Buffer.BlockCopy (integer, 1, uinteger, 0, length);
242 DSAParameters dsaParams = new DSAParameters ();
243 // for DSA m_publickey contains 1 ASN.1 integer - Y
244 ASN1 pubkey = new ASN1 (m_publickey);
245 if ((pubkey == null) || (pubkey.Tag != 0x02))
247 dsaParams.Y = GetUnsignedBigInteger (pubkey.Value);
249 ASN1 param = new ASN1 (m_keyalgoparams);
250 if ((param == null) || (param.Tag != 0x30) || (param.Count < 3))
252 if ((param [0].Tag != 0x02) || (param [1].Tag != 0x02) || (param [2].Tag != 0x02))
254 dsaParams.P = GetUnsignedBigInteger (param [0].Value);
255 dsaParams.Q = GetUnsignedBigInteger (param [1].Value);
256 dsaParams.G = GetUnsignedBigInteger (param [2].Value);
258 // BUG: MS BCL 1.0 can't import a key which
259 // isn't the same size as the one present in
261 _dsa = (DSA) new DSACryptoServiceProvider (dsaParams.Y.Length << 3);
262 _dsa.ImportParameters (dsaParams);
275 public X509ExtensionCollection Extensions {
276 get { return extensions; }
281 if (certhash == null) {
282 HashAlgorithm hash = null;
283 switch (m_signaturealgo) {
284 case "1.2.840.113549.1.1.2": // MD2 with RSA encryption
285 // maybe someone installed MD2 ?
287 hash = HashAlgorithm.Create ("MD2");
289 hash = Mono.Security.Cryptography.MD2.Create ();
292 case "1.2.840.113549.1.1.4": // MD5 with RSA encryption
293 hash = MD5.Create ();
295 case "1.2.840.113549.1.1.5": // SHA-1 with RSA Encryption
296 case "1.3.14.3.2.29": // SHA1 with RSA signature
297 case "1.2.840.10040.4.3": // SHA1-1 with DSA
298 hash = SHA1.Create ();
303 if ((decoder == null) || (decoder.Count < 1))
305 byte[] toBeSigned = decoder [0].GetBytes ();
306 certhash = hash.ComputeHash (toBeSigned, 0, toBeSigned.Length);
308 return (byte[]) certhash.Clone ();
312 public virtual string IssuerName {
313 get { return m_issuername; }
316 public virtual string KeyAlgorithm {
317 get { return m_keyalgo; }
320 public virtual byte[] KeyAlgorithmParameters {
322 if (m_keyalgoparams == null)
324 return (byte[]) m_keyalgoparams.Clone ();
328 public virtual byte[] PublicKey {
330 if (m_publickey == null)
332 return (byte[]) m_publickey.Clone ();
336 public virtual RSA RSA {
339 RSAParameters rsaParams = new RSAParameters ();
340 // for RSA m_publickey contains 2 ASN.1 integers
341 // the modulus and the public exponent
342 ASN1 pubkey = new ASN1 (m_publickey);
343 ASN1 modulus = pubkey [0];
344 if ((modulus == null) || (modulus.Tag != 0x02))
346 ASN1 exponent = pubkey [1];
347 if (exponent.Tag != 0x02)
350 rsaParams.Modulus = GetUnsignedBigInteger (modulus.Value);
351 rsaParams.Exponent = exponent.Value;
353 // BUG: MS BCL 1.0 can't import a key which
354 // isn't the same size as the one present in
356 int keySize = (rsaParams.Modulus.Length << 3);
357 _rsa = (RSA) new RSACryptoServiceProvider (keySize);
358 _rsa.ImportParameters (rsaParams);
371 public virtual byte[] RawData {
373 if (m_encodedcert == null)
375 return (byte[]) m_encodedcert.Clone ();
379 public virtual byte[] SerialNumber {
381 if (serialnumber == null)
383 return (byte[]) serialnumber.Clone ();
387 public virtual byte[] Signature {
389 if (signature == null)
392 switch (m_signaturealgo) {
393 case "1.2.840.113549.1.1.2": // MD2 with RSA encryption
394 case "1.2.840.113549.1.1.4": // MD5 with RSA encryption
395 case "1.2.840.113549.1.1.5": // SHA-1 with RSA Encryption
396 case "1.3.14.3.2.29": // SHA1 with RSA signature
397 return (byte[]) signature.Clone ();
399 case "1.2.840.10040.4.3": // SHA-1 with DSA
400 ASN1 sign = new ASN1 (signature);
401 if ((sign == null) || (sign.Count != 2))
403 // parts may be less than 20 bytes (i.e. first bytes were 0x00)
404 byte[] part1 = sign [0].Value;
405 byte[] part2 = sign [1].Value;
406 byte[] sig = new byte [40];
407 Buffer.BlockCopy (part1, 0, sig, (20 - part1.Length), part1.Length);
408 Buffer.BlockCopy (part2, 0, sig, (40 - part2.Length), part2.Length);
412 throw new CryptographicException ("Unsupported hash algorithm: " + m_signaturealgo);
417 public virtual string SignatureAlgorithm {
418 get { return m_signaturealgo; }
421 public virtual byte[] SignatureAlgorithmParameters {
423 if (m_signaturealgoparams == null)
424 return m_signaturealgoparams;
425 return (byte[]) m_signaturealgoparams.Clone ();
429 public virtual string SubjectName {
430 get { return m_subject; }
433 public virtual DateTime ValidFrom {
434 get { return m_from; }
437 public virtual DateTime ValidUntil {
438 get { return m_until; }
442 get { return version; }
445 public bool IsCurrent {
446 get { return WasCurrent (DateTime.Now); }
449 public bool WasCurrent (DateTime instant)
451 return ((instant > ValidFrom) && (instant <= ValidUntil));
454 internal bool VerifySignature (DSA dsa)
456 // signatureOID is check by both this.Hash and this.Signature
457 DSASignatureDeformatter v = new DSASignatureDeformatter (dsa);
458 // only SHA-1 is supported
459 v.SetHashAlgorithm ("SHA1");
460 return v.VerifySignature (this.Hash, this.Signature);
463 internal bool VerifySignature (RSA rsa)
465 RSAPKCS1SignatureDeformatter v = new RSAPKCS1SignatureDeformatter (rsa);
466 switch (m_signaturealgo) {
467 // MD2 with RSA encryption
468 case "1.2.840.113549.1.1.2":
469 // maybe someone installed MD2 ?
470 v.SetHashAlgorithm ("MD2");
472 // MD5 with RSA encryption
473 case "1.2.840.113549.1.1.4":
474 v.SetHashAlgorithm ("MD5");
476 // SHA-1 with RSA Encryption
477 case "1.2.840.113549.1.1.5":
478 case "1.3.14.3.2.29":
479 v.SetHashAlgorithm ("SHA1");
482 throw new CryptographicException ("Unsupported hash algorithm: " + m_signaturealgo);
484 return v.VerifySignature (this.Hash, this.Signature);
487 public bool VerifySignature (AsymmetricAlgorithm aa)
490 throw new ArgumentNullException ("aa");
493 return VerifySignature (aa as RSA);
495 return VerifySignature (aa as DSA);
497 throw new NotSupportedException ("Unknown Asymmetric Algorithm " + aa.ToString ());
500 public bool CheckSignature (byte[] hash, string hashAlgorithm, byte[] signature)
502 RSACryptoServiceProvider r = (RSACryptoServiceProvider) RSA;
503 return r.VerifyHash (hash, hashAlgorithm, signature);
506 public bool IsSelfSigned {
508 if (m_issuername == m_subject)
509 return VerifySignature (RSA);
515 #if INSIDE_CORLIB || NET_2_0
516 public ASN1 GetIssuerName ()
521 public ASN1 GetSubjectName ()
526 protected X509Certificate (SerializationInfo info, StreamingContext context)
528 Parse ((byte[]) info.GetValue ("raw", typeof (byte[])));
531 [SecurityPermission (SecurityAction.Demand, SerializationFormatter = true)]
532 public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
534 info.AddValue ("raw", m_encodedcert);
535 // note: we NEVER serialize the private key