public abstract void ImportParameters(RSAParameters parameters);
public override void ImportParameters(RSAParameters parameters)
{
_rsa.Modulus = parameters.Modulus;
_rsa.Exponent = parameters.Exponent;
_rsa.P = parameters.P;
_rsa.Q = parameters.Q;
_rsa.DP = parameters.DP;
_rsa.DQ = parameters.DQ;
_rsa.InverseQ = parameters.InverseQ;
_rsa.D = parameters.D;
bool privateKey = false;
if(parameters.D!=null && parameters.D.Length > 0)
privateKey = true;
_rsa.BuildRawKey(privateKey);
}
public static void VerifySig(XmlDocument sigDoc)
{
try
{
XmlElement envelope = sigDoc.DocumentElement;
XmlElement securityElem = LameXpath.SelectSingleNode(sigDoc, Elem.Security);
if(securityElem != null)
{
XmlAttribute mustUndAtt = securityElem.Attributes[Attrib.mustUnderstand,Ns.soap];
if(mustUndAtt != null)
mustUndAtt.Value = "0";
}
XmlElement sigElem = LameXpath.SelectSingleNode(sigDoc, Elem.Signature);
if(sigElem == null)
return;
XmlElement sigValElem = LameXpath.SelectSingleNode(sigElem, Elem.SignatureValue);
byte [] baSigVal = OpenNETCF.Security.Cryptography.NativeMethods.Format.GetB64(sigValElem.InnerText);
bool comments = false;
bool exclusive = true;
SHA1CryptoServiceProvider shaCsp = new SHA1CryptoServiceProvider();
XmlElement sigMethElem = LameXpath.SelectSingleNode(sigElem, Elem.SignatureMethod);
string segMeth = sigMethElem.Attributes["Algorithm"].Value;
XmlElement signedInfoElem = LameXpath.SelectSingleNode(sigElem, Elem.SignedInfo);
XmlDocument xdSignedInfo = new XmlDocument();
xdSignedInfo.LoadXml(signedInfoElem.OuterXml);
XmlCanonicalizer xc = new XmlCanonicalizer(comments, exclusive);
MemoryStream ms = (MemoryStream) xc.Canonicalize(xdSignedInfo);
byte [] baMs = new byte[ms.Length];
ms.Read(baMs, 0, baMs.Length);
ArrayList keyInfoRefElem = LameXpath.SelectChildNodes(sigElem, Elem.SecurityTokenReference, Elem.Reference);
XmlElement keyInfoRef = (XmlElement) keyInfoRefElem[0];
string secTokUri = keyInfoRef.Attributes["URI"].Value;
secTokUri = secTokUri.TrimStart(new char[]{'#'});
XmlElement secTokElem = LameXpath.SelectSingleNode(secTokUri, sigDoc);
if(secTokElem.LocalName == Elem.UsernameToken)
{
XmlElement nonce = LameXpath.SelectSingleNode(secTokElem, Elem.Nonce);
XmlElement created = LameXpath.SelectSingleNode(secTokElem, Elem.Created);
//DerivedKeyGenerator seems to be off by 1?
//byte [] baKey = P_SHA1.DeriveKey(ClearPassword, StrKeyLabel, nonce.InnerText, created.InnerText, NumKeyBytes);
byte [] baKey = P_SHA1.DeriveKey(SigObj.ClearPassword, StrKeyLabel, nonce.InnerText, created.InnerText, NumKeyBytes);
HMACSHA1 hmacSha = new HMACSHA1(baKey);
byte [] baSig = hmacSha.ComputeHash(baMs);
OpenNETCF.Security.Cryptography.NativeMethods.Format.SameBytes(baSigVal, baSig);
}
else if(secTokElem.LocalName == Elem.BinarySecurityToken)
{
byte [] baCert = OpenNETCF.Security.Cryptography.NativeMethods.Format.GetB64(secTokElem.InnerText);
X509Certificate cert = new X509Certificate(baCert); //pub key to verify sig.
byte [] exponent;
byte [] modulus;
DecodeCertKey.GetPublicRsaParams(cert, out exponent, out modulus);
RSAParameters rsaParam = new RSAParameters();
rsaParam.Exponent = exponent;
rsaParam.Modulus = modulus;
RSACryptoServiceProvider rsaCsp = new RSACryptoServiceProvider();
rsaCsp.ImportParameters(rsaParam);
byte [] baUnsigHash = shaCsp.ComputeHash(baMs);
bool valid = rsaCsp.VerifyHash(baUnsigHash, "SHA", baSigVal);
if(valid == false)
throw new Exception("signature is not valid");
}
else if(secTokElem.LocalName == Elem.SecurityContextToken)
{
//TODO how to validate signature?
}
else
{
throw new Exception("only support Username, BinarySecurity, and SecurityContext Token signature");
}
//verify reference hashes
string refdName = String.Empty;
ArrayList refNodes = LameXpath.SelectChildNodes(sigDoc, Elem.SignedInfo, Elem.Reference);
foreach(object oXn in refNodes)
{
XmlNode xn = (XmlNode) oXn;
string uriId = xn.Attributes[Attrib.URI].Value;
uriId = uriId.TrimStart(new char[]{'#'});
XmlElement digValElem = LameXpath.SelectSingleNode(xn, Elem.DigestValue);
byte [] baDigest = OpenNETCF.Security.Cryptography.NativeMethods.Format.GetB64(digValElem.InnerText);
XmlElement refdElem = LameXpath.SelectSingleNode(uriId, sigDoc);
XmlDocument xdRefdElem = new XmlDocument();
refdName = refdElem.LocalName; //for debug visibility
xdRefdElem.LoadXml(refdElem.OuterXml);
//not reusable
xc = new XmlCanonicalizer(comments, exclusive);
//MemoryStream ms = (MemoryStream) xc.Canonicalize(refdElem);
ms = (MemoryStream) xc.Canonicalize(xdRefdElem);
baMs = new byte[ms.Length];
ms.Read(baMs, 0, baMs.Length);
byte [] baHash = shaCsp.ComputeHash(baMs);
try
{
OpenNETCF.Security.Cryptography.NativeMethods.Format.SameBytes(baDigest, baHash);
}
catch(Exception ex)
{
throw new Exception(refdName + ":" + ex.Message, ex);
}
}
}
finally
{
//ClearPassword = null;
SigObj = null;
}
}
public override RSAParameters ExportParameters(bool includePrivateParameters)
{
RSAParameters parameters = new RSAParameters();
parameters.Modulus = _rsa.Modulus;
parameters.Exponent = _rsa.Exponent;
if(includePrivateParameters == true)
{
parameters.P = _rsa.P;
parameters.Q = _rsa.Q;
parameters.DP = _rsa.DP;
parameters.DQ = _rsa.DQ;
parameters.InverseQ = _rsa.InverseQ;
parameters.D = _rsa.D;
}
return parameters;
}