RSACryptoServiceProvider - Decrypt

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RSACryptoServiceProvider - Decrypt

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Using RSA encryption, I pass the encrypted data from the client to the server decrypt. When trying to decrypt, it gives me an exception CryptographicException with the message:

Invalid flags specified.

I have no idea Flag may be missing.

My code looks like this:

byte[] decryptedMessage;
RSACryptoServiceProvider asr = new RSACryptoServiceProvider(128);
decryptedMessage = asr.Decrypt(buffer, false);

at System.Security.Cryptography.CryptographicException.ThrowCryptogaphicException (Int32 hr) in System.Security.Cryptography.Utils._GenerateKey (SafeProvHandle hProv, Int32 algid, CspProviderFlags flags, Int32 keySize, SafeKeyHandle & hKey) in System.Security.Cryptography.Utils.GetKeyPairHelper (CspAlgorithmType keyType, CspParameters parameters, Boolean randomKeyContainer, Int32 dwKeySize, SafeProvHandle & safeProvHandle, SafeKeyHandle & safeKeyHandle) in System.Security.Cryptography.RSACryptoServiceProvider.GetKeyPair () in System.Security.Cryptography.RSACryptoServiceProvider.Decrypt (Byte [rgb, Boolean fOAEP]

c# criptografia rsa

asked by anonymous 17.06.2014 / 15:24

1 answer

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score 0 · Accepted Answer

RSACryptoServiceProvider does not support 128-bit keys:

The support key sizes of 384 bit RSACryptoServiceProvider to 16384 bits in 8-bit increments if you have the enhanced Microsoft Encryption Provider installed. Supports 384-bit to 512-bit key sizes in 8-bit increments if you have the Microsoft Base Cryptographic Provider installed.

Source: MSDN - Property RSACryptoServiceProvider.KeySize

Original SOen response .