Cryptography Helper

by Alexandru Lungu 18. December 2010 18:29


Contains more than 50 extensions to Stream, byte[] and string that helps to encrypt/decrypt using symmetric and asymmetric algorithms and to compute hashes.

Most usual situation is when in the entire application you use the same algorithm and password to encrypt/decrypt or the same hashing algorithm and the same salt. In that case just set the DefaultSymmetricCryptoServiceProvider (any crypto service provider derived from SymmetricAlgorithm), DefaultRsaCryptoServiceProvider, DefaultHashSalt of the CryptoHelper class and this will be used when you use the extension methods without specifying the algorithm/salt/ password, etc like this:

encrypted = data.Encrypt();
decrypted = encrypted.Decrypt();

Otherwise you can use it like this:

string key = RandomPassword.Generate(32);
encrypted = data.Encrypt(key);
decrypted = encrypted.Decrypt(key);

Or like this:

string key = RandomPassword.Generate(32);
AesCryptoServiceProvider service = new AesCryptoServiceProvider();
service.KeySize = 256;
service.Key = Encoding.UTF8.GetBytes(key);

encrypted = data.Encrypt(service);
decrypted = encrypted.Decrypt(service);

data, encrypted, decrypted can be string/byte[]/stream.

Similar for RSA (but using RsaEncrypt/RsaDecrypt).

Protect/Unprotect uses current user credential to encrypt/decrypt so decryption won’t work outside the user context that did the encryption.

And for hash:

hash = data.ComputeHash(HashType.SHA512, "MySalt");

Everything should be strait forward to use it; you have also a good documentation.

ALungu.Security.dll (13.50 kb)
ALungu.Security.chm (217.15 kb)
ALungu.Security.zip (source code) (161.53 kb)

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