/// <summary>
/// encrypts a string
/// </summary>
/// <remarks>
/// for efficiency the given string will be UTF8 encoded
/// and padded to the next block border, the CBC IV plus
/// the encrypted data will then be BASE64 encoded and
/// returned as an string
/// </remarks>
/// <param name="sPlainText">
/// the string to encrypt
/// </param>
/// <returns>
/// the encrypted string
/// </returns>
public String Encrypt
(String sPlainText)
{
int nI;
// convert string
byte[] ueData = m_ue.GetBytes(sPlainText);
// prepare the input and the output buffer
int nOrigLen = ueData.Length;
int nLen = nOrigLen;
// (we need aligned and "pad-able" buffers)
int nMod = nLen % Blowfish.BLOCKSIZE;
nLen = (nLen - nMod) + Blowfish.BLOCKSIZE;
// allocate the input buffer
byte[] inBuf = new byte[nLen];
// copy the data and do the padding
Array.Copy(ueData, 0, inBuf, 0, nOrigLen);
nI = nLen - (Blowfish.BLOCKSIZE - nMod);
while (nI < nLen)
{
inBuf[nI++] = (byte)nMod;
}
// allocate the output buffer
byte[] outBuf = new byte[inBuf.Length + Blowfish.BLOCKSIZE];
// create and set a new IV
byte[] iv = new byte[Blowfish.BLOCKSIZE];
m_rng.GetBytes(iv);
m_bfc.Iv = iv;
// do the encryption
m_bfc.Encrypt(inBuf,
outBuf,
0,
Blowfish.BLOCKSIZE,
inBuf.Length);
// copy the IV
Array.Copy(iv, 0, outBuf, 0, Blowfish.BLOCKSIZE);
// BASE64 encode the whole thing
String sResult = Convert.ToBase64String(outBuf);
// finally clear the plaintext buffer
Array.Clear(inBuf, 0, inBuf.Length);
return(sResult);
}
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);
}
