public int TransformBlock
(
byte[] bufIn,
int nOfsIn,
int nCount,
byte[] bufOut,
int nOfsOut
)
{
// NOTE: we assume that the caller understands the meaning of
// this method and that only even byte boundaries are
// given, thus we do not cache any data left internally
int nResult = 0;
if (null != m_bfc)
{
if (m_blIsEncryptor)
{
nResult = m_bfc.Encrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
else
{
nResult = m_bfc.Decrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
}
else if (null != m_bf)
{
if (m_blIsEncryptor)
{
nResult = m_bf.Encrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
else
{
nResult = m_bf.Decrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
}
else
{
nResult = 0;
}
return(nResult * Blowfish.BLOCKSIZE);
}
public int TransformBlock
(
byte[] bufIn,
int nOfsIn,
int nCount,
byte[] bufOut,
int nOfsOut
)
{
int nResult = 0;
if (null != m_bfc)
{
if (m_blIsEncryptor)
{
nResult = m_bfc.Encrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
else
{
nResult = m_bfc.Decrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
}
else if (null != m_bf)
{
if (m_blIsEncryptor)
{
nResult = m_bf.Encrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
else
{
nResult = m_bf.Decrypt(bufIn, bufOut, nOfsIn, nOfsOut, nCount);
}
}
else
{
nResult = 0;
}
return(nResult * Blowfish.BLOCKSIZE);
}
/// <summary>
/// decrypts a string
/// </summary>
/// <remarks>
/// The string has to be decrypted with the same key,
/// otherwise the result will be just garbage. If you
/// want to check if the key is the right one use the
/// VerifyKey() method.
/// </remarks>
/// <param name="sCipherText">
/// the string to decrypt
/// </param>
/// <returns>
/// the decrypted (original) string (null on error)
/// </returns>
public String Decrypt
(String sCipherText)
{
byte[] cdata = Convert.FromBase64String(sCipherText);
if (cdata.Length < Blowfish.BLOCKSIZE)
{
return(null);
}
// set the cbc IV
m_bfc.Iv = cdata;
// decrypt the data
byte[] outBuf = new byte[cdata.Length];
int nDataAbs = cdata.Length - Blowfish.BLOCKSIZE;
nDataAbs /= Blowfish.BLOCKSIZE;
nDataAbs *= Blowfish.BLOCKSIZE;
m_bfc.Decrypt(cdata,
outBuf,
Blowfish.BLOCKSIZE,
0,
nDataAbs);
// calculate the original size
int nOrigSize = nDataAbs -
Blowfish.BLOCKSIZE +
outBuf[nDataAbs - 1];
// UTF8 decode the result and pass it back
return(m_ue.GetString(outBuf, 0, nOrigSize));
}
