public static byte[] Encrypt(byte[] plaintext, AesEncryptionInfo info)
{
if (info == null) throw new ArgumentNullException("info");
if (plaintext == null || plaintext.Length <= 0)
throw new ArgumentNullException("plaintext");
if (info.Key == null || info.Key.Length <= 0)
throw new ArgumentNullException("key");
if (info.IV == null || info.IV.Length <= 0)
throw new ArgumentNullException("iv");
MemoryStream memoryStream;
AesManaged aesAlg = null;
try
{
// Create the encryption algorithm object with the specified key and IV.
aesAlg = new AesManaged();
aesAlg.Key = info.Key;
aesAlg.IV = info.IV;
// Create an encryptor to perform the stream transform.
var encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for encryption.
memoryStream = new MemoryStream();
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plaintext, 0, plaintext.Length);
}
}
finally
{
if (aesAlg != null)
aesAlg.Clear();
}
// Return the encrypted bytes from the memory stream.
return memoryStream.ToArray();
}
public static byte[] Decrypt(byte[] ciphertext, AesEncryptionInfo info)
{
if (info == null) throw new ArgumentNullException("info");
if (ciphertext == null || ciphertext.Length <= 0)
throw new ArgumentNullException("plainText");
if (info.Key == null || info.Key.Length <= 0)
throw new ArgumentNullException("key");
if (info.IV == null || info.IV.Length <= 0)
throw new ArgumentNullException("iv");
AesManaged aesAlg = null;
try
{
// Create a the encryption algorithm object with the specified key and IV.
aesAlg = new AesManaged();
aesAlg.Key = info.Key;
aesAlg.IV = info.IV;
// Create a decrytor to perform the stream transform.
var decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
using (var memoryStream = new MemoryStream(ciphertext))
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
int len = cryptoStream.Read(ciphertext, 0, ciphertext.Length);
return ciphertext.RangeSubset(0, len);
}
}
finally
{
if (aesAlg != null)
aesAlg.Clear();
}
}
private IList<Attribute> CollectAndEncryptAttributes(AesEncryptionInfo encryptionInfo)
{
IList<Attribute> attributes = new List<Attribute>();
foreach (string s in this.listBoxUploadKeywords.Items)
{
byte[] att = SymmetricEncryptor.Encrypt(s.GetBytes(), encryptionInfo);
attributes.Add(new Attribute(GuidCreator.CreateGuidFromString(s), att));
}
return attributes;
}
