public static void Test()
{
System.IO.MemoryStream m = new System.IO.MemoryStream();
var b = new System.IO.BinaryWriter(m);
for (int i = 0; i < 512; i++)
{
b.Write((byte)1);
b.Write((byte)2);
}
var buffs = m.GetBuffer();
var index = m.Position;
byte[] bs = new byte[index];
for (int i = 0; i < bs.Length; i++)
{
bs[i] = buffs[i];
}
int buffLen = bs.Length;
int tempCount = 0;
var encBuff = new TeaEncTempBuffer();
var tempBuff = new byte[1420];
NetworkCryptologyUtil.TeaEncrypt(encBuff, bs, buffLen, TestKey, tempBuff, ref tempCount);
System.Console.WriteLine(tempCount);
System.Console.WriteLine(tempBuff);
var data1 = tempBuff.Take(tempCount).ToArray();
tempCount = data1.Length;
var decBuff = new TeaDecTempBuffer();
var tempBuff1 = new byte[1420];
NetworkCryptologyUtil.TeaDecrypt(decBuff, data1, tempCount, TestKey, tempBuff1, ref tempCount);
System.Console.WriteLine(tempCount);
System.Console.WriteLine(tempBuff1);
}
static void TeaDecryptECB(TeaDecTempBuffer decTempBuffer, byte[] pInBuf, int inBufIndex, byte[] pKey, byte[] pOutBuf, int outBufIndex)
{
uint y, z, sum;
uint[] k = decTempBuffer.dec_k;
int i;
y = (uint)System.BitConverter.ToInt32(pInBuf, 0);
z = (uint)System.BitConverter.ToInt32(pInBuf, 4);
for (i = 0; i < 4; i++)
{
k[i] = (uint)System.BitConverter.ToInt32(pKey, i * 4);
}
sum = DELTA << LOG_ROUNDS;
for (i = 0; i < ROUNDS; i++)
{
z -= ((y << 4) + k[2]) ^ (y + sum) ^ ((y >> 5) + k[3]);
y -= ((z << 4) + k[0]) ^ (z + sum) ^ ((z >> 5) + k[1]);
sum -= DELTA;
}
IntToBytes((int)y, pOutBuf, outBufIndex);
IntToBytes((int)z, pOutBuf, outBufIndex + 4);
}
/*pKey为16byte*/
/*
* 输入:pInBuf为密文格式,nInBufLen为pInBuf的长度是8byte的倍数; *pOutBufLen为接收缓冲区的长度
* 特别注意*pOutBufLen应预置接收缓冲区的长度!
* 输出:pOutBuf为明文(Body),pOutBufLen为pOutBuf的长度,至少应预留nInBufLen-10;
* 返回值:如果格式正确返回TRUE;
*/
/*TEA解密算法,CBC模式*/
/*密文格式:PadLen(1byte)+Padding(var,0-7byte)+Salt(2byte)+Body(var byte)+Zero(7byte)*/
public static bool TeaDecrypt(TeaDecTempBuffer decTempBuffer, byte[] pInBuf, int nInBufLen, byte[] pKey, byte[] pOutBuf, ref int pOutBufLen)
{
int nPadLen, nPlainLen;
byte[] dest_buf = decTempBuffer.dec_dest_buff;
byte[] zero_buf = decTempBuffer.dec_zero_buff;
byte[] iv_pre_crypt = decTempBuffer.dec_iv_pre;
byte[] iv_cur_crypt = decTempBuffer.dec_iv_cur;
int dest_i, i, j;
//byte[] pInBufBoundary;
int nBufPos = 0;
int inBufPos = 0;
if ((nInBufLen % 8) != 0 || (nInBufLen < 16))
{
return(false);
}
TeaDecryptECB(decTempBuffer, pInBuf, inBufPos, pKey, dest_buf, nBufPos);
nPadLen = dest_buf[0] & 0x7 /*只要最低三位*/;
/*密文格式:PadLen(1byte)+Padding(var,0-7byte)+Salt(2byte)+Body(var byte)+Zero(7byte)*/
i = nInBufLen - 1 /*PadLen(1byte)*/ - nPadLen - SALT_LEN - ZERO_LEN; /*明文长度*/
if (pOutBufLen < i || (i < 0))
{
return(false);
}
pOutBufLen = i;
//pInBufBoundary = pInBuf + nInBufLen; /*输入缓冲区的边界，下面不能pInBuf>=pInBufBoundary*/
for (i = 0; i < 8; i++)
{
zero_buf[i] = 0;
}
System.Buffer.BlockCopy(zero_buf, 0, iv_pre_crypt, 0, 8);
System.Buffer.BlockCopy(pInBuf, inBufPos, iv_cur_crypt, 0, 8);
inBufPos += 8;
nBufPos += 8;
dest_i = 1; /*dest_i指向dest_buf下一个位置*/
/*把Padding滤掉*/
dest_i += nPadLen;
/*dest_i must <=8*/
/*把Salt滤掉*/
for (i = 1; i <= SALT_LEN;)
{
if (dest_i < 8)
{
dest_i++;
i++;
}
else if (dest_i == 8)
{
/*解开一个新的加密块*/
/*改变前一个加密块的指针*/
System.Buffer.BlockCopy(iv_cur_crypt, 0, iv_pre_crypt, 0, 8);
System.Buffer.BlockCopy(pInBuf, inBufPos, iv_cur_crypt, 0, 8);
/*异或前一块明文(在dest_buf[]中)*/
for (j = 0; j < 8; j++)
{
if ((nBufPos + j) >= nInBufLen)
{
return(false);
}
dest_buf[j] ^= pInBuf[inBufPos + j];
}
/*dest_i==8*/
TeaDecryptECB(decTempBuffer, dest_buf, 0, pKey, dest_buf, 0);
/*在取出的时候才异或前一块密文(iv_pre_crypt)*/
inBufPos += 8;
nBufPos += 8;
dest_i = 0; /*dest_i指向dest_buf下一个位置*/
}
}
/*还原明文*/
int outBufPos = 0;
nPlainLen = pOutBufLen;
while (nPlainLen > 0)
{
if (dest_i < 8)
{
pOutBuf[outBufPos++] = (byte)(dest_buf[dest_i] ^ iv_pre_crypt[dest_i]);
dest_i++;
nPlainLen--;
}
else if (dest_i == 8)
{
/*dest_i==8*/
/*改变前一个加密块的指针*/
System.Buffer.BlockCopy(iv_cur_crypt, 0, iv_pre_crypt, 0, 8);
System.Buffer.BlockCopy(pInBuf, inBufPos, iv_cur_crypt, 0, 8);
/*解开一个新的加密块*/
/*异或前一块明文(在dest_buf[]中)*/
for (j = 0; j < 8; j++)
{
if ((nBufPos + j) >= nInBufLen)
{
return(false);
}
dest_buf[j] ^= pInBuf[j + inBufPos];
}
TeaDecryptECB(decTempBuffer, dest_buf, 0, pKey, dest_buf, 0);
/*在取出的时候才异或前一块密文(iv_pre_crypt)*/
inBufPos += 8;
nBufPos += 8;
dest_i = 0; /*dest_i指向dest_buf下一个位置*/
}
}
/*校验Zero*/
for (i = 1; i <= ZERO_LEN;)
{
if (dest_i < 8)
{
if ((dest_buf[dest_i] ^ iv_pre_crypt[dest_i]) != 0)
{
return(false);
}
dest_i++;
i++;
}
else if (dest_i == 8)
{
/*改变前一个加密块的指针*/
System.Buffer.BlockCopy(iv_cur_crypt, 0, iv_pre_crypt, 0, 8);
System.Buffer.BlockCopy(pInBuf, inBufPos, iv_cur_crypt, 0, 8);
/*解开一个新的加密块*/
/*异或前一块明文(在dest_buf[]中)*/
for (j = 0; j < 8; j++)
{
if ((nBufPos + j) >= nInBufLen)
{
return(false);
}
dest_buf[j] ^= pInBuf[j + inBufPos];
}
TeaDecryptECB(decTempBuffer, dest_buf, 0, pKey, dest_buf, 0);
/*在取出的时候才异或前一块密文(iv_pre_crypt)*/
inBufPos += 8;
nBufPos += 8;
dest_i = 0; /*dest_i指向dest_buf下一个位置*/
}
}
return(true);
}
