/// <summary>
/// standard constructor
/// </summary>
/// <param name="sKey">
/// the string which is used as the key material, internally
/// a UTF8 representation is used, hashed with SHA-1, thus
/// we use a 160bit key (which does not make weak keys safe!)
/// </param>
public BlowfishSimple
(String sKey)
{
m_ue = new UTF8Encoding();
byte[] keyRaw = TransformKey(sKey);
HashAlgorithm sha = new SHA1CryptoServiceProvider();
byte[] key = sha.ComputeHash(keyRaw);
sha = null;
m_rng = new RNGCryptoServiceProvider();
byte[] checksumSalt = new byte[20];
m_rng.GetBytes(checksumSalt);
byte[] checksum = CalcKeyChecksum(checksumSalt, keyRaw);
byte[] checksumCombo = new byte[checksumSalt.Length + checksum.Length];
Array.Copy(checksumSalt, 0, checksumCombo, 0, checksumSalt.Length);
Array.Copy(checksum, 0, checksumCombo, checksumSalt.Length, checksum.Length);
m_sKeyChecksum = Convert.ToBase64String(checksumCombo);
// (start with a dummy IV)
byte[] iv = new byte[Blowfish.BLOCKSIZE];
m_bfc = new BlowfishCBC(key, iv);
Array.Clear(keyRaw, 0, keyRaw.Length);
Array.Clear(key, 0, key.Length);
Array.Clear(iv, 0, iv.Length);
}
/// <summary>
/// constructor
/// </summary>
public BlowfishAlgorithm() : base()
{
m_bf = null;
m_bfc = null;
// FIXME: are we supposed to create a default key and IV?
IVValue = null;
KeyValue = null;
KeySizeValue = Blowfish.MAXKEYLENGTH * 8;
LegalBlockSizesValue = new KeySizes[1];
LegalBlockSizesValue[0] = new KeySizes(BlockSize, BlockSize, 8);
LegalKeySizesValue = new KeySizes[1];
LegalKeySizesValue[0] = new KeySizes(0, Blowfish.MAXKEYLENGTH * 8, 8);
ModeValue = CipherMode.ECB;
m_rng = null;
}
public BlowfishAlgorithm() : base()
{
m_bf = null;
m_bfc = null;
IVValue = null;
KeyValue = null;
KeySizeValue = Blowfish.MAXKEYLENGTH * 8;
LegalBlockSizesValue = new KeySizes[1];
LegalBlockSizesValue[0] = new KeySizes(BlockSize, BlockSize, 8);
LegalKeySizesValue = new KeySizes[1];
LegalKeySizesValue[0] = new KeySizes(0, Blowfish.MAXKEYLENGTH * 8, 8);
ModeValue = CipherMode.ECB;
m_rng = null;
}
BlowfishAlgorithm
(
byte[] key,
byte[] iv,
bool blCBC,
bool blIsEncryptor
)
{
if (null == key)
{
GenerateKey();
}
else
{
Key = key;
}
if (blCBC)
{
if (null == iv)
{
GenerateIV();
}
else
{
IV = iv;
}
m_bf = null;
m_bfc = new BlowfishCBC(KeyValue, IVValue);
}
else
{
m_bf = new Blowfish(KeyValue);
m_bfc = null;
}
m_blIsEncryptor = blIsEncryptor;
}
