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PODecryption using the public key
 

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    <p>I want to encrypt some data with my private RSA key and then decrypt it on the client machine with the public key. As far as I know, this is a normal way of using RSA. However, as far as I see, there is a problem with this in <code>RSACryptoServiceProvider</code> of the .NET Framework. While the decryption works fine when you provide both the public and the private key to the <code>RSACryptoServiceProvider</code>, it doesn't when you only provide only the public key. In this case, I get a padding error:</p> <pre><code>Error occurred while decoding OAEP padding. at System.Security.Cryptography.RSACryptoServiceProvider.DecryptKey(SafeKeyHandle pKeyContext, Byte[] pbEncryptedKey, Int32 cbEncryptedKey, Boolean fOAEP, ObjectHandleOnStack ohRetDecryptedKey) at System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(Byte[] rgb, Boolean fOAEP) </code></pre> <p>Notes :</p> <ul> <li>I encrypt/decrypt with <code>fOAEP</code> set to <code>true</code>.</li> <li>I use a 1024 key size and the data that I want to encrypt are no longer than 65 bytes.</li> <li>I load my keys from XML.</li> </ul> <p>Am I missing sth? I don't see any setting for the padding that I can change.</p> <p>Definitely, I can't send my private key to the client machine...</p> <p>Should I try another library like Bouncy Castle ?</p> <p>I have found <a href="https://stackoverflow.com/questions/7847743/using-an-rsa-public-key-to-decrypt-a-string-that-was-encrypted-using-rsa-private">this</a> question too, but there is no clear solution and, according to the author, his final solution was to use code from <a href="http://www.codeproject.com/Articles/38739/RSA-Private-Key-Encryption" rel="nofollow noreferrer">this article</a>. However, I would prefer to use the .NET Framework's code if possible and I don't understand why my decryption fails.</p> <p>Also, I don't think that my data is so long that <a href="https://stackoverflow.com/a/7849202/964053">this answer</a> is of any relevance.</p> <p>Perhaps I could use SignHash()/VerifyHash() but I think those calculate the hash from the data before encrypting it while I already have a hash computed and I just need to encrypt it. Using SignHash() will limit the variety of hashing algorithms that I could use, so it may be better to avoid it. </p>
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    1. CO"I want to encrypt some data with my private RSA key and then decrypt it on the client machine with the public key." I think you've got that backwards. You can only decrypt with the private key, but you can encrypt with the public key.
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    2. CO@Steven V : When you sign a hash that is used to authenticate the source of some data (adding digital signature), isn't the signature the encrypted hash which was encrypted using the private key? That's what I want to do.
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    3. COhttp://en.wikipedia.org/wiki/Public-key_cryptography "Each user has a pair of cryptographic keys – a public encryption key and a private decryption key."
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