/// <summary>Creates a new Blowfish stream.</summary>
/// <param name="stm">The stream to read or write to.</param>
/// <param name="mode">Operation mode</param>
/// <param name="key">The buffer with the key material.</param>
/// <param name="ofs">Where the key material starts in the buffer.</param>
/// <param name="len">Length of the key material in bytes.</param>
public static BlowfishStream Create(
Stream stm,
BlowfishStreamMode mode,
byte[] key,
int ofs,
int len)
{
SHA1 sha = new SHA1CryptoServiceProvider();
BlowfishAlgorithm balg = new BlowfishAlgorithm();
balg.Key = sha.ComputeHash(key, ofs, len);
balg.Padding = PaddingMode.PKCS7;
balg.Mode = CipherMode.CBC;
sha.Clear();
if (BlowfishStreamMode.Write == mode)
{
byte[] iv = balg.IV;
stm.Write(iv, 0, iv.Length);
return(new BlowfishStream(stm, balg.CreateEncryptor(), CryptoStreamMode.Write));
}
else
{
byte[] iv = new byte[balg.BlockSize >> 3];
for (int i = 0; i < iv.Length; i++)
{
int ivb = stm.ReadByte();
if (-1 == ivb)
{
throw new IOException(Properties.Resources.JAVAIOP_CANNOT_READ_IV);
}
iv[i] = (byte)ivb;
}
balg.IV = iv;
return(new BlowfishStream(stm, balg.CreateDecryptor(), CryptoStreamMode.Read));
}
}
/// <summary>Creates a new Blowfish stream.</summary>
/// <param name="stm">The stream to read or write to.</param>
/// <param name="mode">Operation mode</param>
/// <param name="key">The buffer with the key material.</param>
/// <param name="ofs">Where the key material starts in the buffer.</param>
/// <param name="len">Length of the key material in bytes.</param>
public static BlowfishStream Create(
Stream stm,
BlowfishStreamMode mode,
byte[] key,
int ofs,
int len)
{
SHA1 sha = new SHA1CryptoServiceProvider();
BlowfishAlgorithm balg = new BlowfishAlgorithm();
balg.Key = sha.ComputeHash(key, ofs, len);
balg.Padding = PaddingMode.PKCS7;
balg.Mode = CipherMode.CBC;
sha.Clear();
if (BlowfishStreamMode.Write == mode)
{
byte[] iv = balg.IV;
stm.Write(iv, 0, iv.Length);
return new BlowfishStream(stm, balg.CreateEncryptor(), CryptoStreamMode.Write);
}
else
{
byte[] iv = new byte[balg.BlockSize >> 3];
for (int i = 0; i < iv.Length; i++)
{
int ivb = stm.ReadByte();
if (-1 == ivb)
{
throw new IOException( Properties.Resources.JAVAIOP_CANNOT_READ_IV);
}
iv[i] = (byte)ivb;
}
balg.IV = iv;
return new BlowfishStream(stm, balg.CreateDecryptor(), CryptoStreamMode.Read);
}
}
