Hello Allen,
I am looking for somebody who could help you on it. Thanks.
Best regards,
Yanhong Huang
Microsoft Online Partner Support
Get Secure! -
www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
!Content-Class: urn:content-classes:message
!From: "Allen Holman" <(E-Mail Removed)>
!Sender: "Allen Holman" <(E-Mail Removed)>
!Subject: Cryptography - File Signing
!Date: Wed, 30 Jul 2003 06:29:40 -0700
!Lines: 104
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!I need to sign files with the same technique on both my
!PC and my PDA. Below is the code I currently have on my
!PC.
!--------------------------------------------------------
!public bool SignFile()
!{
!bool bSuccess = false;
!try
! {
! FileStream fileStream = null;
! SHA1 hash = new SHA1CryptoServiceProvider();
! byte []
! hashCode = null,
! signedData = null;
! RSACryptoServiceProvider
! RSASign = new RSACryptoServiceProvider();
! // Compute the SHA1 hash code for the import file
! fileStream = File.Open(strFileName, FileMode.Open,
! FileAccess.Read, FileShare.None);
! hashCode = hash.ComputeHash(fileStream);
! fileStream.Close();
! // Encrypt the hashCode using the private RSA key
! RSASign.FromXmlString(strXMLPrivateKey);
! // The second argument is the NIST OSE Implementors
! // Workshop (OIW) Security SIG algorithm identifiers
! // for the sha1 hash algorithm
! signedData = RSASign.SignHash(
! hashCode, "1.3.14.3.2.26");
! fileStream = File.Open(strFileName + ".Signature",
! FileMode.OpenOrCreate, FileAccess.Write,
! FileShare.None);
! fileStream.Write(signedData, 0, signedData.Length);
! fileStream.Close();
! bSuccess = true;
! }
! catch
! {
! bSuccess = false;
! }
! return bSuccess;
!}
!
!Here is the code for my PDA.
!-------------------------------------------------------
!public unsafe void SignFile(string strImportFileName)
!{
!const int iBufferSize = 1024;
!IntPtr
! hKey = (IntPtr)0,
! hProvider = (IntPtr)0,
! hHash = (IntPtr)0;
!byte []
! bHashData = new byte[iBufferSize],
! bSignature = null;
!int
! iBytesRead = 0,
! iLgth = 0;
!FileStream
! stream = null;
!
!// Encrypt the file
!if (CryptAcquireContext(ref hProvider, null, null,
! RSA_PROV_FULL, 0))
! {
! // Replace CryptGenKey with CryptImportKey when working
! if (CryptGenKey(hProvider, AT_SIGNATURE,
! CRYPT_EXPORTABLE, ref hKey))
! {
! if (CryptCreateHash(hProvider, CALG_SHA1,
! (IntPtr)0, 0, ref hHash))
! {
! stream = File.OpenRead(strImportFileName);
! iBytesRead = stream.Read(bHashData, 0,
! iBufferSize);
! while (iBytesRead > 0)
! {
! CryptHashData(hHash,bHashData,iBytesRead,0);
! iBytesRead = stream.Read(bHashData, 0,
! iBufferSize);
! }
! stream.Close();
! iLgth = iBufferSize;
! CryptSignHash(hHash,AT_SIGNATURE,null,0,null,
! ref iLgth);
! bSignature = new byte[iLgth];
! CryptSignHash(hHash, AT_SIGNATURE, null, 0,
! bSignature,ref iLgth);
! stream = File.OpenWrite(strImportFileName
! + ".Signature");
! stream.Write(bSignature,0,iLgth);
! stream.Close();
! CryptDestroyHash(hHash);
! }
! }
! CryptReleaseContext(hProvider,0);
! }
!}
!
!Any assistance in getting the two code to produced
!identical hashes and signed hashes will be appreciated.
!
!Allen
!
!
!
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