我有一些问题将 C++ 代码转换为 PHP。目的是我需要使用XTEA 密码将我的应用程序（使用 C++ 构建）与 Web 服务器（PHP）通信，以通过 XMLRPC 加密/解密请求的数据包。
我从一些项目Lode 的编程接口中获取的原始代码和我的意思是这个代码。
一些片段：
inline void xtea_encipher(unsigned int num_rounds, unsigned long* v, unsigned long* k)
{
unsigned long v0 = v[0], v1 = v[1];
unsigned long sum = 0, delta = 0x9E3779B9;
for(unsigned int i = 0; i < num_rounds; i++)
{
v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
sum += delta;
v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
}
v[0] = v0;
v[1] = v1;
}
inline void xtea_decipher(unsigned int num_rounds, unsigned long* v, unsigned long* k)
{
unsigned long v0 = v[0], v1 = v[1];
unsigned long delta = 0x9E3779B9, sum = delta * num_rounds;
for(unsigned int i = 0; i < num_rounds; i++)
{
v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
sum -= delta;
v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
}
v[0] = v0;
v[1] = v1;
}
template<typename T>
void xtea_encipher(T& out, const T& in, const std::string& password)
{
out = in;
size_t extra_zeroes = (8 - (out.size() % 8)) % 8;
out.resize(out.size() + extra_zeroes, 0); //add values until the size is a multiple of 8
unsigned long k[4]; //128 bit key
std::string pw16 = password; //password with 16 chars (=128 bit)
pw16.resize(16, 0);
typedef unsigned char uc;
k[0] = ((uc)pw16[ 0]) | ((uc)pw16[ 1] << 8) | ((uc)pw16[ 2] << 16) | ((uc)pw16[ 3] << 24);
k[1] = ((uc)pw16[ 4]) | ((uc)pw16[ 5] << 8) | ((uc)pw16[ 6] << 16) | ((uc)pw16[ 7] << 24);
k[2] = ((uc)pw16[ 8]) | ((uc)pw16[ 9] << 8) | ((uc)pw16[10] << 16) | ((uc)pw16[11] << 24);
k[3] = ((uc)pw16[12]) | ((uc)pw16[13] << 8) | ((uc)pw16[14] << 16) | ((uc)pw16[15] << 24);
unsigned long v[2];
for(size_t i = 0; i + 7 < out.size(); i += 8)
{
v[0] = ((uc)out[i + 0]) | ((uc)out[i + 1] << 8) | ((uc)out[i + 2] << 16) | ((uc)out[i + 3] << 24);
v[1] = ((uc)out[i + 4]) | ((uc)out[i + 5] << 8) | ((uc)out[i + 6] << 16) | ((uc)out[i + 7] << 24);
xtea_encipher(64, v, k);
out[i + 0] = (v[0]) & 255; out[i + 1] = (v[0] >> 8) & 255; out[i + 2] = (v[0] >> 16) & 255; out[i + 3] = (v[0] >> 24) & 255;
out[i + 4] = (v[1]) & 255; out[i + 5] = (v[1] >> 8) & 255; out[i + 6] = (v[1] >> 16) & 255; out[i + 7] = (v[1] >> 24) & 255;
}
out.push_back(extra_zeroes); //at the end, specify to the data how many zeroes can be removed after decoding
}
//returns false if everything went ok, returns true and does nothing if the amount of zeros is > 7 which means it wasn't an enciphered file OR the filesize modulo 8 of the input file isn't 1
template<typename T>
bool xtea_decipher(T& out, const T& in, const std::string& password)
{
if((in.size() % 8) != 1) return true; //error, incorrect size
size_t extra_zeroes = in[in.size() - 1];
if(extra_zeroes >= 8) return true; //error, incorrect amount of extra zeroes indicated
out = in;
out.resize(out.size() - 1);
unsigned long k[4]; //128 bit key
std::string pw16 = password; //password with 16 chars (=128 bit)
pw16.resize(16, 0);
typedef unsigned char uc;
k[0] = ((uc)pw16[ 0]) | ((uc)pw16[ 1] << 8) | ((uc)pw16[ 2] << 16) | ((uc)pw16[ 3] << 24);
k[1] = ((uc)pw16[ 4]) | ((uc)pw16[ 5] << 8) | ((uc)pw16[ 6] << 16) | ((uc)pw16[ 7] << 24);
k[2] = ((uc)pw16[ 8]) | ((uc)pw16[ 9] << 8) | ((uc)pw16[10] << 16) | ((uc)pw16[11] << 24);
k[3] = ((uc)pw16[12]) | ((uc)pw16[13] << 8) | ((uc)pw16[14] << 16) | ((uc)pw16[15] << 24);
unsigned long v[2];
for(size_t i = 0; i + 7 < in.size(); i += 8)
{
v[0] = ((uc)out[i + 0]) | ((uc)out[i + 1] << 8) | ((uc)out[i + 2] << 16) | ((uc)out[i + 3] << 24);
v[1] = ((uc)out[i + 4]) | ((uc)out[i + 5] << 8) | ((uc)out[i + 6] << 16) | ((uc)out[i + 7] << 24);
xtea_decipher(64, v, k);
out[i + 0] = (v[0]) & 255; out[i + 1] = (v[0] >> 8) & 255; out[i + 2] = (v[0] >> 16) & 255; out[i + 3] = (v[0] >> 24) & 255;
out[i + 4] = (v[1]) & 255; out[i + 5] = (v[1] >> 8) & 255; out[i + 6] = (v[1] >> 16) & 255; out[i + 7] = (v[1] >> 24) & 255;
}
out.resize(out.size() - extra_zeroes);
return false;
}
也许有人可以帮助将上述代码转换为 PHP 代码？非常感谢您提供的所有帮助。
提前致谢。