/// <summary>
/// Encrypts a file at <see cref="path"/> using the cert at <see cref="certCerPath"/>
/// </summary>
/// <param name="path"></param>
/// <param name="certCerPath"></param>
/// <returns></returns>
public static void EncryptFile(string path, string certCerPath)
{
//test inputs
TestEnDeCryptInputs(path, certCerPath, String.Empty);
var encFile = Path.Combine(Path.GetDirectoryName(path) ?? Environment.CurrentDirectory,
Path.GetFileName(path) + NF_CRYPTO_EXT);
//import the cert
var cert = new X509Certificate2(certCerPath);
var pubKey = cert.PublicKey.Key;
using (var aes = new AesManaged())
{
aes.KeySize = 256;
aes.BlockSize = 128;
aes.Mode = CipherMode.CBC;
using (var trns = aes.CreateEncryptor())
{
var keyFm = new RSAPKCS1KeyExchangeFormatter(pubKey);
var enKey = keyFm.CreateKeyExchange(aes.Key, aes.GetType());
var lenK = BitConverter.GetBytes(enKey.Length);
var lIv = BitConverter.GetBytes(aes.IV.Length);
using (var outFs = new FileStream(encFile, FileMode.Create))
{
outFs.Write(lenK, 0, 4);
outFs.Write(lIv, 0, 4);
outFs.Write(enKey, 0, enKey.Length);
outFs.Write(aes.IV, 0, aes.IV.Length);
using (var cryptStream = new CryptoStream(outFs, trns, CryptoStreamMode.Write))
{
var blockSz = aes.BlockSize / 8;
var data = new byte[blockSz];
using (var inFs = new FileStream(path, FileMode.Open))
{
var count = 0;
do
{
count = inFs.Read(data, 0, blockSz);
cryptStream.Write(data, 0, count);
} while (count > 0);
inFs.Close();
}
cryptStream.FlushFinalBlock();
cryptStream.Close();
}
outFs.Close();
}
}
}
}
public byte[] EncryptWithX509(byte[] bytesToEncrypt)
{
// TODO: Exercise 1: Task 3a: Get the public key from the X509 certificate.
//throw new NotImplementedException();
var provider = (RSACryptoServiceProvider)this._certificate.PublicKey.Key;
// TODO: Exercise 1: Task 3b: Create an instance of the AesManaged algorithm.
using (var algorithm = new AesManaged())
{
// TODO: Exercise 1: Task 3c: Create an underlying stream for the unencrypted data.
using (var outStream = new MemoryStream())
{
// TODO: Exercise 1: Task 3d: Create an AES encryptor based on the key and IV.
using (var encryptor = algorithm.CreateEncryptor())
{
var keyFormatter = new RSAPKCS1KeyExchangeFormatter(provider);
var encryptedKey = keyFormatter.CreateKeyExchange(algorithm.Key, algorithm.GetType());
// TODO: Exercise 1: Task 3e: Create byte arrays to get the length of the encryption key and IV.
var keyLength = BitConverter.GetBytes(encryptedKey.Length);
var ivLength = BitConverter.GetBytes(algorithm.IV.Length);
// TODO: Exercise 1: Task 3f: Write the following to the out stream:
// 1) the length of the encryption key.
outStream.Write(keyLength, 0, keyLength.Length);
// 2) the length of the IV.
outStream.Write(ivLength, 0, ivLength.Length);
// 3) the encryption key.
outStream.Write(encryptedKey, 0, encryptedKey.Length);
// 4) the IV.
outStream.Write(algorithm.IV, 0, algorithm.IV.Length);
// TODO: Exercise 1: Task 3g: Create a CryptoStream that will write the encypted data to the underlying buffer.
using (var encrypt = new CryptoStream(outStream, encryptor, CryptoStreamMode.Write))
{
// TODO: Exercise 1: Task 3h: Write all the data to the stream.
encrypt.Write(bytesToEncrypt, 0, bytesToEncrypt.Length);
encrypt.FlushFinalBlock();
// TODO: Exercise 1: Task 3i: Return the encrypted buffered data as a byte[].
return(outStream.ToArray());
}
}
}
}
}
byte[] EncryptWithX509(byte[] bytesToEncypt)
{
// Get the public key from the X509 certificate. This key will be used to encrypt the AesManaged encryption key.
var provider = (RSACryptoServiceProvider)this._certificate.PublicKey.Key;
// Create an instance of the AesManaged algorithm which we will use to encrypt the data with.
using (var algorithm = new AesManaged())
{
// Create an underlying stream which the decrypted data will be buffered too.
using (var outStream = new MemoryStream())
{
// Create an AES encryptor based on the key and IV.
using (var encryptor = algorithm.CreateEncryptor())
{
var keyFormatter = new RSAPKCS1KeyExchangeFormatter(provider);
var encryptedKey = keyFormatter.CreateKeyExchange(algorithm.Key, algorithm.GetType());
// Create byte arrays to get the length of the encryption key and IV.
var keyLength = BitConverter.GetBytes(encryptedKey.Length);
var ivLength = BitConverter.GetBytes(algorithm.IV.Length);
// Write the following to the out stream:
// 1) the length of the encryption key.
// 2) the length of the IV.
// 3) the encryption key.
// 4) the IV.
// 5) the encrypted data.
outStream.Write(keyLength, 0, 4);
outStream.Write(ivLength, 0, 4);
outStream.Write(encryptedKey, 0, encryptedKey.Length);
outStream.Write(algorithm.IV, 0, algorithm.IV.Length);
// Create a CryptoStream that will write the encypted data to the underlying buffer.
using (var encrypt = new CryptoStream(outStream, encryptor, CryptoStreamMode.Write))
{
// Write all the data to the stream.
encrypt.Write(bytesToEncypt, 0, bytesToEncypt.Length);
encrypt.FlushFinalBlock();
// Return the encrypted buffered data as a byte[].
return(outStream.ToArray());
}
}
}
}
}
// Encrypt a file using a public key.
private static void EncryptFile(string inFile, RSACryptoServiceProvider rsaPublicKey)
{
using (AesManaged aesManaged = new AesManaged())
{
// Create instance of AesManaged for
// symetric encryption of the data.
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform transform = aesManaged.CreateEncryptor())
{
RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
// Create byte arrays to contain
// the length values of the key and IV.
byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];
int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
// Write the following to the FileStream
// for the encrypted file (outFs):
// - length of the key
// - length of the IV
// - ecrypted key
// - the IV
// - the encrypted cipher content
int startFileName = inFile.LastIndexOf("\\") + 1;
// Change the file's extension to ".enc"
string outFile = encrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") - startFileName) + ".enc";
Directory.CreateDirectory(encrFolder);
using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{
outFs.Write(LenK, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(keyEncrypted, 0, lKey);
outFs.Write(aesManaged.IV, 0, lIV);
// Now write the cipher text using
// a CryptoStream for encrypting.
using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
// By encrypting a chunk at
// a time, you can save memory
// and accommodate large files.
int count = 0;
int offset = 0;
// blockSizeBytes can be any arbitrary size.
int blockSizeBytes = aesManaged.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;
using (FileStream inFs = new FileStream(inFile, FileMode.Open))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
}
}
}
}
// Encrypt a file using a public key.
private static MemoryStream EncryptFile(byte[] unencryptedData, RSACryptoServiceProvider rsaPublicKey)
{
MemoryStream stream = null;
using (AesManaged aesManaged = new AesManaged())
{
// Create instance of AesManaged for
// symetric encryption of the data.
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform transform = aesManaged.CreateEncryptor())
{
RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
// Create byte arrays to contain
// the length values of the key and IV.
byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];
int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
// Write the following to the FileStream
// for the encrypted file (outFs):
// - length of the key
// - length of the IV
// - ecrypted key
// - the IV
// - the encrypted cipher content
stream = new MemoryStream();
try
{
stream.Write(LenK, 0, 4);
stream.Write(LenIV, 0, 4);
stream.Write(keyEncrypted, 0, lKey);
stream.Write(aesManaged.IV, 0, lIV);
// Now write the cipher text using
// a CryptoStream for encrypting.
CryptoStream outStreamEncrypted = new CryptoStream(stream, transform, CryptoStreamMode.Write);
try
{
// By encrypting a chunk at
// a time, you can save memory
// and accommodate large files.
int count = 0;
int offset = 0;
// blockSizeBytes can be any arbitrary size.
int blockSizeBytes = aesManaged.BlockSize / 8;
do
{
if (offset + blockSizeBytes <= unencryptedData.Length)
{
count = blockSizeBytes;
}
else
{
count = unencryptedData.Length - offset;
}
outStreamEncrypted.Write(unencryptedData, offset, count);
offset += count;
}while (offset < unencryptedData.Length);
outStreamEncrypted.FlushFinalBlock();
}
catch (Exception ex)
{
Console.WriteLine("Error : {0}", ex.Message);
}
}
catch (Exception ex)
{
Console.WriteLine("Error : {0}", ex.Message);
}
stream.Position = 0;
}
}
return(stream);
}
private async static Task File(string inFile, string outFile, RSACryptoServiceProvider key)
{
using (AesManaged aesManaged = new AesManaged())
{
// Create instance of AesManaged for
// symetric encryption of the data.
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform transform = aesManaged.CreateEncryptor())
{
RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(key);
byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
// Create byte arrays to contain
// the length values of the key and IV.
byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];
int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
// Write the following to the FileStream
// for the encrypted file (outFs):
// - length of the key
// - length of the IV
// - ecrypted key
// - the IV
// - the encrypted cipher content
using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{
await outFs.WriteAsync(LenK, 0, 4);
await outFs.WriteAsync(LenIV, 0, 4);
await outFs.WriteAsync(keyEncrypted, 0, lKey);
await outFs.WriteAsync(aesManaged.IV, 0, lIV);
// Now write the cipher text using
// a CryptoStream for encrypting.
using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
// By encrypting a chunk at
// a time, you can save memory
// and accommodate large files.
int count = 0;
int offset = 0;
// blockSizeBytes can be any arbitrary size.
int blockSizeBytes = aesManaged.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;
using (FileStream inFs = new FileStream(inFile, FileMode.Open))
{
do
{
count = await inFs.ReadAsync(data, 0, blockSizeBytes);
offset += count;
await outStreamEncrypted.WriteAsync(data, 0, count);
bytesRead += blockSizeBytes;
}while (count > 0);
}
}
}
}
}
}
private static void EncryptData(Stream output, Stream input, AsymmetricAlgorithm rsaPublicKey)
{
using (AesManaged aesManaged = new AesManaged())
{
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform transform = aesManaged.CreateEncryptor())
{
RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];
int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
output.Write(LenK, 0, 4);
output.Write(LenIV, 0, 4);
output.Write(keyEncrypted, 0, lKey);
output.Write(aesManaged.IV, 0, lIV);
using (CryptoStream streamEncrypted = new CryptoStream(output, transform, CryptoStreamMode.Write))
{
int count = 0;
int offset = 0;
int blockSizeBytes = aesManaged.BlockSize / 8;
byte[] buffer = new byte[blockSizeBytes];
int bytesRead = 0;
do
{
count = input.Read(buffer, 0, blockSizeBytes);
offset += count;
streamEncrypted.Write(buffer, 0, count);
bytesRead += blockSizeBytes;
}while (count > 0);
input.Close();
streamEncrypted.FlushFinalBlock();
streamEncrypted.Close();
}
}
}
}
public void Encrypt(Stream inStream, Stream outStream, AsymmetricAlgorithm rsaPublicKey)
{
using (AesManaged aesManaged = new AesManaged())
{
// Create instance of AesManaged for symetric encryption of the data.
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform transform = aesManaged.CreateEncryptor())
{
RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
// Create byte arrays to contain the length values of the key and IV.
byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];
int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
// Write the following to the FileStream for the encrypted file (outFs):
// - length of the key
// - length of the IV
// - ecrypted key
// - the IV
// - the encrypted cipher content
outStream.Write(LenK, 0, 4);
outStream.Write(LenIV, 0, 4);
outStream.Write(keyEncrypted, 0, lKey);
outStream.Write(aesManaged.IV, 0, lIV);
// Now write the cipher text using a CryptoStream for encrypting.
using (CryptoStream outStreamEncrypted = new CryptoStream(outStream, transform, CryptoStreamMode.Write))
{
{
int bytesRead = 0;
int blockSizeBytes = aesManaged.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
while ((bytesRead = inStream.Read(data, 0, blockSizeBytes)) > 0)
{
outStreamEncrypted.Write(data, 0, bytesRead);
}
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
}
}
}
public byte[] Encrypt(byte[] bytesToEncrypt, string certName)
{
var cert = GetCert(certName);
var provider = cert.PublicKey.Key;
using (var algorithm = new AesManaged())
using (var outStream = new MemoryStream())
using (var encryptor = algorithm.CreateEncryptor())
{
var keyFormatter = new RSAPKCS1KeyExchangeFormatter(provider);
var encyptedKey = keyFormatter.CreateKeyExchange(algorithm.Key, algorithm.GetType());
var keyLength = BitConverter.GetBytes(encyptedKey.Length);
var ivLength = BitConverter.GetBytes(algorithm.IV.Length);
outStream.Write(keyLength, 0, 4);
outStream.Write(ivLength, 0, 4);
outStream.Write(encyptedKey, 0, encyptedKey.Length);
outStream.Write(algorithm.IV, 0, algorithm.IV.Length);
using (var encrypt = new CryptoStream(outStream, encryptor, CryptoStreamMode.Write))
{
encrypt.Write(bytesToEncrypt, 0, bytesToEncrypt.Length);
encrypt.FlushFinalBlock();
return(outStream.ToArray());
}
}
}
public byte[] Encrypt(byte[] content, RSACng rsaPublicKey)
{
using (var aesManaged = new AesManaged())
{
aesManaged.KeySize = 256;
aesManaged.BlockSize = 128;
aesManaged.Mode = CipherMode.CBC;
using (var transform = aesManaged.CreateEncryptor())
{
var keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
var keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());
var LenK = new byte[4];
var LenIV = new byte[4];
var lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
var lIV = aesManaged.IV.Length;
LenIV = BitConverter.GetBytes(lIV);
using (var outFs = new MemoryStream())
{
outFs.Write(LenK, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(keyEncrypted, 0, lKey);
outFs.Write(aesManaged.IV, 0, lIV);
using (var outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
// By encrypting a chunk at
// a time, you can save memory
// and accommodate large files.
var count = 0;
var offset = 0;
// blockSizeBytes can be any arbitrary size.
var blockSizeBytes = aesManaged.BlockSize / 8;
var data = new byte[blockSizeBytes];
var bytesRead = 0;
using (var inFs = new MemoryStream(content))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
return(outFs.ToArray());
}
}
}
}
