/// <summary>
/// Purpose: To encrypt a raw byte buffer using the specified mode. The output is a raw byte buffer
/// </summary>
/// <param name="inBuffer"></param>
/// <param name="iMode"></param>
/// <returns></returns>
public byte[] EncryptBuffer(byte[] inBuffer)
{
int inBufferSize = inBuffer.Length;
if (inBufferSize == 0)
return new byte[0];
// Since this is a block cypher algorithm, we have to encrypt full blocks of data so we
// have to create a new buffer that is an even block size
byte pad = 0;
if (inBufferSize % 8 != 0)
pad = (byte)(8 - (inBufferSize % 8));
else
pad = 8;
int internalBufferSize = inBufferSize + pad;
byte[] internalBuffer = new byte[internalBufferSize];
// Set the pad bytes to the appropriate value
for (int i = inBufferSize; i < internalBufferSize; i++)
internalBuffer[i] = pad;
byte[] outBuffer = new byte[internalBufferSize];
inBuffer.CopyTo(internalBuffer, 0);
//Check the buffer's length - should be > 0 and multiple of 8
if ((internalBufferSize != 0) && (internalBufferSize % 8 == 0))
{
switch (mode)
{
case Mode.CBC:
BlowfishCBC bfCBC = new BlowfishCBC(key);
bfCBC.Encrypt(internalBuffer, 0, outBuffer, 0, internalBuffer.Length);
break;
case Mode.ECB:
BlowfishECB bfECB = new BlowfishECB(key);
bfECB.Encrypt(internalBuffer, 0, outBuffer, 0, internalBuffer.Length);
break;
}
}
return outBuffer;
}
//////////////////////////////////////////////////////////////////////
/// <see cref="BlowfishECB.Clone"/>
public new object Clone()
{
BlowfishCBC result;
result = new BlowfishCBC();
result.m_pbox = (uint[])this.m_pbox.Clone();
result.m_sbox1 = (uint[])this.m_sbox1.Clone();
result.m_sbox2 = (uint[])this.m_sbox2.Clone();
result.m_sbox3 = (uint[])this.m_sbox3.Clone();
result.m_sbox4 = (uint[])this.m_sbox4.Clone();
result.m_block = (byte[])this.m_block.Clone();
result.m_nIsWeakKey = this.m_nIsWeakKey;
result.m_ivHi = this.m_ivHi;
result.m_ivLo = this.m_ivLo;
return result;
}
/// <summary>
/// Purpose: To decrypt an encrypted buffer using the specified mode
/// </summary>
/// <param name="inBuffer"></param>
/// <param name="iMode"></param>
/// <returns></returns>
public byte[] DecryptBuffer(byte[] inBuffer)
{
int internalBufferSize = inBuffer.Length;
if (internalBufferSize % 8 != 0)
internalBufferSize += (8 - (internalBufferSize % 8));
byte[] internalBuffer = new byte[internalBufferSize];
inBuffer.CopyTo(internalBuffer, 0);
byte[] outBuffer = new byte[internalBufferSize];
switch (mode)
{
case Mode.CBC:
BlowfishCBC bfCBC = new BlowfishCBC(key);
bfCBC.Decrypt(inBuffer, 0, outBuffer, 0, inBuffer.Length);
break;
case Mode.ECB:
BlowfishECB bfECB = new BlowfishECB(key);
bfECB.Decrypt(inBuffer, 0, outBuffer, 0, inBuffer.Length);
break;
}
return outBuffer;
}
