Windows Cryptography Problem Am using RSA Key Exchange...

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Question by vedprakash
Submitted on 7/1/2003
Related FAQ: Cryptography FAQ (01/10: Overview)
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Windows Cryptography Problem Am using RSA Key Exchange algorithm(CALG_RSA_KEYX ) with 1024 key length. Am Encrypting directly with the Public key & Decrypting with the Private Key....No session is invloved anywhere.... Am using Microsoft SDK CryptoAPI for this.. Provider used is MS ENHANCED Provider... Provider type used is PROV_RSA_FULL... API 'CryptEncrypt()' encrypts, the return code is always a success code. But while decryption using API 'CryptDecrypt()', at times the function decrypts properly, but at times it fails with NTE_BAD_DATA... With the same Key & same data being Encrypted,at times decryption succeeds & and at times fails with NTE_BAD_DATA.... What could be goin wrong....is it something to do with the Block chaining or Padding... as RSA CALG_RSA_KEYX is neither a block cipher algorithm nor stream cipher,what is going wrong.... Any Solutions

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Answer by Pascal
Submitted on 8/19/2003
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I do have the exact same problem. Have you found the solution since?

Answer by tkd
Submitted on 8/20/2003
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What OS? Ran into the same problem in W2K It turns out that there was a registry entry for cryptography that had to be removed before it would install. I saved the key then removed it and everything worked. You can read the links below for more detail. The key was HKEY_CURRENT_USER\Software\Microsoft\Cryptography

Answer by sumit
Submitted on 10/29/2003
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Did anybody find the answer to the above problem? If so please e-mail me at sumitcelly@yahoo.com

Answer by fofo
Submitted on 12/25/2004
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Hi there, I have question, Describe all actions and messages sent for the RSA key exchange?? I need the answer for this question ASAP thanks

Answer by claudiu
Submitted on 8/25/2005
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Windows NT and Windows Me/98/95: The Microsoft Enhanced Cryptographic Provider is not available. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/seccrypto/security/cryptencrypt.asp this could be the cause? But I'm sure that you avoid running the application under Windows NT and Windows Me/98/95. claudiu_burdulea@yahoo.com

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