static void GetFile()
{
EncryptionType et;
GetResponse resp = conn.get(bucket, GetFilename(path, ".file"), null);
string encryptionMethod = resp.Connection.Headers["x-amz-meta-crypt"];
string encryptionSalt = resp.Connection.Headers["x-amz-meta-crypt-salt"];
if (encryptionSalt == null)
encryptionSalt = path.ToLower();
else
encryptionSalt = Uri.UnescapeDataString(encryptionSalt);
if (encryptionMethod.StartsWith("rc4"))
et = EncryptionType.etRC4;
else if (encryptionMethod.StartsWith("aes"))
et = EncryptionType.etAES;
else et = EncryptionType.etNone;
Stream s = resp.GetResponseStream();
RC4 rc4 = new RC4();
string keyString = secretKey + encryptionSalt;
Rijndael aes = RijndaelManaged.Create();
int blockIndex = 0;
int blockOffset = 0;
byte[] ivec = null;
byte[] evec = null;
byte[] key;
if (et != EncryptionType.etNone)
{
int keylen = (et == EncryptionType.etAES) ? 32 : 16;
key = new byte[keylen];
rc4.EVP_BytesToKey(new byte[0], Encoding.Default.GetBytes(keyString), 1, key, new byte[0]);
if (et == EncryptionType.etAES)
{
aes.Mode = CipherMode.ECB;
aes.Key = key;
blockIndex = 0;
blockOffset = 0;
ivec = (new MD5CryptoServiceProvider()).ComputeHash(Encoding.Default.GetBytes(encryptionSalt));
evec = new byte[ivec.Length];
} else
{
rc4.Init(key);
}
}
using (FileStream fs = File.OpenWrite(localfile))
{
byte[] buffer = new byte[1024];
while (true)
{
int nread = s.Read(buffer, 0, buffer.Length);
if (nread == 0)
return;
byte[] decrypt = (et == EncryptionType.etAES) ? AESCTREncrypt(aes.CreateEncryptor(), buffer, nread, ivec, evec, ref blockIndex, ref blockOffset) :
(et == EncryptionType.etRC4) ? rc4.Encrypt(buffer, nread) : buffer;
fs.Write(decrypt, 0, nread);
}
}
}
static void GetFile()
{
EncryptionType et;
GetResponse resp = conn.get(bucket, GetFilename(path, ".file"), null);
string encryptionMethod = resp.Connection.Headers["x-amz-meta-crypt"];
string encryptionSalt = resp.Connection.Headers["x-amz-meta-crypt-salt"];
if (encryptionSalt == null)
{
encryptionSalt = path.ToLower();
}
else
{
encryptionSalt = Uri.UnescapeDataString(encryptionSalt);
}
if (encryptionMethod.StartsWith("rc4"))
{
et = EncryptionType.etRC4;
}
else if (encryptionMethod.StartsWith("aes"))
{
et = EncryptionType.etAES;
}
else
{
et = EncryptionType.etNone;
}
Stream s = resp.GetResponseStream();
RC4 rc4 = new RC4();
string keyString = secretKey + encryptionSalt;
Rijndael aes = RijndaelManaged.Create();
int blockIndex = 0;
int blockOffset = 0;
byte[] ivec = null;
byte[] evec = null;
byte[] key;
if (et != EncryptionType.etNone)
{
int keylen = (et == EncryptionType.etAES) ? 32 : 16;
key = new byte[keylen];
rc4.EVP_BytesToKey(new byte[0], Encoding.Default.GetBytes(keyString), 1, key, new byte[0]);
if (et == EncryptionType.etAES)
{
aes.Mode = CipherMode.ECB;
aes.Key = key;
blockIndex = 0;
blockOffset = 0;
ivec = (new MD5CryptoServiceProvider()).ComputeHash(Encoding.Default.GetBytes(encryptionSalt));
evec = new byte[ivec.Length];
}
else
{
rc4.Init(key);
}
}
using (FileStream fs = File.OpenWrite(localfile))
{
byte[] buffer = new byte[1024];
while (true)
{
int nread = s.Read(buffer, 0, buffer.Length);
if (nread == 0)
{
return;
}
byte[] decrypt = (et == EncryptionType.etAES) ? AESCTREncrypt(aes.CreateEncryptor(), buffer, nread, ivec, evec, ref blockIndex, ref blockOffset) :
(et == EncryptionType.etRC4) ? rc4.Encrypt(buffer, nread) : buffer;
fs.Write(decrypt, 0, nread);
}
}
}
