/*pOutBuffer、pInBuffer均为8char, pKey为16char*/
static void TeaEncryptECB(TeaEncTempBuffer encTempBuffer, byte[] pInBuf, int inBufPos, byte[] pKey, byte[] pOutBuf, int outBufIndex)
{
uint y, z;
uint sum;
uint[] k = encTempBuffer.enc_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 = 0;
for (i = 0; i < ROUNDS; i++)
{
sum += DELTA;
y += ((z << 4) + k[0]) ^ (z + sum) ^ ((z >> 5) + k[1]);
z += ((y << 4) + k[2]) ^ (y + sum) ^ ((y >> 5) + k[3]);
}
IntToBytes((int)y, pOutBuf, outBufIndex);
IntToBytes((int)z, pOutBuf, outBufIndex + 4);
}
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);
}
/*pKey为16char*/
/*
* 输入:pInBuf为需加密的明文部分(Body),nInBufLen为pInBuf长度;
* 输出:pOutBuf为密文格式,pOutBufLen为pOutBuf的长度是8char的倍数;
*/
/*TEA加密算法,CBC模式*/
/*密文格式:PadLen(1char)+Padding(var,0-7char)+Salt(2char)+Body(var char)+Zero(7char)*/
public static void TeaEncrypt(TeaEncTempBuffer encTempBuffer, byte[] pInBuf, int nInBufLen, byte[] pKey, byte[] pOutBuf, ref int pOutBufLen)
{
int nPadSaltBodyZeroLen /*PadLen(1char)+Salt+Body+Zero的长度*/;
int nPadlen;
byte[] src_buf = encTempBuffer.enc_src_buf;
byte[] iv_plain = encTempBuffer.enc_iv_plain;
byte[] iv_crypt = encTempBuffer.enc_iv_crypt;
int src_i, i, j;
int outBufPos = 0;
/*根据Body长度计算PadLen,最小必需长度必需为8char的整数倍*/
nPadSaltBodyZeroLen = nInBufLen /*Body长度*/ + 1 + SALT_LEN + ZERO_LEN /*PadLen(1char)+Salt(2char)+Zero(7char)*/;
nPadlen = nPadSaltBodyZeroLen % 8;
if (0 != nPadlen) /*len=nSaltBodyZeroLen%8*/
{
/*模8余0需补0,余1补7,余2补6,...,余7补1*/
nPadlen = 8 - nPadlen;
}
/*srand( (unsigned)time( NULL ) ); 初始化随机数*/
/*加密第一块数据(8char),取前面10char*/
src_buf[0] = (byte)((((byte)(rand()) & 0x0f8 /*最低三位存PadLen,清零*/) | nPadlen));
src_i = 1; /*src_i指向src_buf下一个位置*/
while (nPadlen-- > 0)
{
src_buf[src_i++] = (byte)rand(); /*Padding*/
}
/*come here, src_i must <= 8*/
for (i = 0; i < 8; i++)
{
iv_plain[i] = 0;
}
System.Buffer.BlockCopy(iv_plain, 0, iv_crypt, 0, 8);
pOutBufLen = 0; /*init OutBufLen*/
for (i = 1; i <= SALT_LEN;) /*Salt(2char)*/
{
if (src_i < 8)
{
src_buf[src_i++] = (byte)rand();
i++; /*i inc in here*/
}
if (src_i == 8)
{
/*src_i==8*/
for (j = 0; j < 8; j++) /*加密前异或前8个char的密文(iv_crypt指向的)*/
{
src_buf[j] ^= iv_crypt[j];
}
/*pOutBuffer、pInBuffer均为8char, pKey为16char*/
/*加密*/
TeaEncryptECB(encTempBuffer, src_buf, 0, pKey, pOutBuf, outBufPos);
for (j = 0; j < 8; j++) /*加密后异或前8个char的明文(iv_plain指向的)*/
{
pOutBuf[j + outBufPos] ^= iv_plain[j];
}
/*保存当前的iv_plain*/
for (j = 0; j < 8; j++)
{
iv_plain[j] = src_buf[j];
}
/*更新iv_crypt*/
src_i = 0;
System.Buffer.BlockCopy(pOutBuf, outBufPos, iv_crypt, 0, 8);
pOutBufLen += 8;
outBufPos += 8;
}
}
int inBufPos = 0;
/*src_i指向src_buf下一个位置*/
while (nInBufLen > 0)
{
if (src_i < 8)
{
src_buf[src_i++] = pInBuf[inBufPos++];
nInBufLen--;
}
if (src_i == 8)
{
/*src_i==8*/
for (j = 0; j < 8; j++) /*加密前异或前8个char的密文(iv_crypt指向的)*/
{
src_buf[j] ^= iv_crypt[j];
}
/*pOutBuffer、pInBuffer均为8char, pKey为16char*/
TeaEncryptECB(encTempBuffer, src_buf, 0, pKey, pOutBuf, outBufPos);
for (j = 0; j < 8; j++) /*加密后异或前8个char的明文(iv_plain指向的)*/
{
pOutBuf[outBufPos + j] ^= iv_plain[j];
}
/*保存当前的iv_plain*/
for (j = 0; j < 8; j++)
{
iv_plain[j] = src_buf[j];
}
src_i = 0;
System.Buffer.BlockCopy(pOutBuf, outBufPos, iv_crypt, 0, 8);
pOutBufLen += 8;
outBufPos += 8;
}
}
/*src_i指向src_buf下一个位置*/
for (i = 1; i <= ZERO_LEN;)
{
if (src_i < 8)
{
src_buf[src_i++] = 0;
i++; /*i inc in here*/
}
if (src_i == 8)
{
/*src_i==8*/
for (j = 0; j < 8; j++) /*加密前异或前8个char的密文(iv_crypt指向的)*/
{
src_buf[j] ^= iv_crypt[j];
}
/*pOutBuffer、pInBuffer均为8char, pKey为16char*/
TeaEncryptECB(encTempBuffer, src_buf, 0, pKey, pOutBuf, outBufPos);
for (j = 0; j < 8; j++) /*加密后异或前8个char的明文(iv_plain指向的)*/
{
pOutBuf[j + outBufPos] ^= iv_plain[j];
}
/*保存当前的iv_plain*/
for (j = 0; j < 8; j++)
{
iv_plain[j] = src_buf[j];
}
src_i = 0;
System.Buffer.BlockCopy(pOutBuf, outBufPos, iv_crypt, 0, 8);
pOutBufLen += 8;
outBufPos += 8;
}
}
}
