/// <summary>
/// 初始化密钥
/// 在解密任务文件和加密任务结果文件之前一定需要执行一次初始化密钥
/// </summary>
private static void InitKey(String encryptionkey)
{
//计算密钥
Byte[] keybytes = new Byte[16];
Byte[] key = DataFormatProcessor.StringToBytes(encryptionkey);
Array.Copy(key, 0, keybytes, 0, key.Length);
//初始化AES密钥
m_aes.InitKey(keybytes);
return;
}
/// <summary>
/// 加密任务结果内容
/// </summary>
/// <param name="filestr"></param>
/// <returns></returns>
private static String EncryptInfo(String filestr)
{
//使用 DataFormatProcessor获取 4字节
Byte[] validdata = DataFormatProcessor.StringToBytes(filestr);
if (validdata == null || validdata.Length < 1)
{
return(null);
}
//总长度
Int32 allLen = validdata.Length;
//原文
Byte[] rawbytes = new Byte[Const_AESEncryptLen];
//密文
Byte[] endata = null;
String Ciphertext = String.Empty;
if (allLen <= Const_AESEncryptLen) //小于等于16字节
{
Array.Copy(validdata, 0, rawbytes, 0, validdata.Length);
//AES加密
m_aes.Encrypt(rawbytes, ref endata);
//转换为HEX string
Ciphertext = DataFormatProcessor.BytesToHexString(endata);
return(Ciphertext);
}
//原始数据大于16字节，分段传输
//已发送的长度
Int32 sentDataTableLen = 0;
//剩余需要发送的长度
Int32 lastDataTableLen = allLen;
rawbytes = new Byte[] { };
List <String> CiphertextList = new List <string> {
};
//检查当前剩下还没发送的数据长度,是否超过32K
while (lastDataTableLen > Const_AESEncryptLen) //超过时，分段发送
{
endata = null;
rawbytes = new Byte[Const_AESEncryptLen];
Array.Copy(validdata, sentDataTableLen, rawbytes, 0, Const_AESEncryptLen);
//随后 已发送长度增加32K
sentDataTableLen += Const_AESEncryptLen;
lastDataTableLen -= Const_AESEncryptLen;
//AES加密
m_aes.Encrypt(rawbytes, ref endata);
//转换为HEX string
Ciphertext = DataFormatProcessor.BytesToHexString(endata);
CiphertextList.Add(Ciphertext);
}
endata = null;
//如果剩余不足32K, 直接全部发送,并且通知客户端已经发送完毕
rawbytes = new Byte[Const_AESEncryptLen];
Array.Copy(validdata, sentDataTableLen, rawbytes, 0, lastDataTableLen);
//AES加密
m_aes.Encrypt(rawbytes, ref endata);
//转换为HEX string
Ciphertext = DataFormatProcessor.BytesToHexString(endata);
CiphertextList.Add(Ciphertext);
return(DataFormatProcessor.ListToString(CiphertextList, ""));
}