凯撒加密/解密算法（VC） Mr

/***********加密CString并写入文件（加法加密）************/
CFile fileWrite;
CString m_strEncryption = _T("需要加密的信息");
int count = m_strEncryption.GetLength();
BYTE* m_byteRead = new BYTE[count];
BYTE* m_byteWrite = new BYTE[count*2];
m_byteRead = (BYTE*)m_strEncryption.GetBuffer(count);
for (int i = 0, k = 0, j = 1; i < count; i++, k = k + 2, j = j + 2)
{
　　m_byteWrite[k] = (byte)((m_byteRead[i] + 参数（密钥）) % 128 + 128);
　　m_byteWrite[j] = (byte)((m_byteRead[i] + 参数（密钥）) / 128);
}

if(fileWrite.Open(输出路径, CFile::modeCreate | CFile::modeWrite))
{
　　fileWrite.Write(m_byteWrite,count*2);
　　fileWrite.Write("\r\n",2);
}
fileWrite.Close();

m_strEncryption.ReleaseBuffer();
delete[] m_byteWrite;

PS：解密及其他方式的加密解密可见《凯撒加密/解密算法（C#）》，将其稍作修改就可适用于VC。