PHPにXTEA C++コードを移植するのに助けが必要

Question

C++コードをPHPに変換する際に問題があります。その目的は、XMLサーバーから要求されたパケットを暗号化/復号化するために、XTEA暗号を使用して、Webサーバー（PHP）で自分のアプリケーション（C++で構築）と通信する必要があることです。

私がいくつかのプロジェクトLode's Programming Interfaceから取得した元のコードと私が意味するコードはthisです。

一部抜粋：

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; 
} 

あり、多分PHPコードにコードの上に変換するのに役立つ可能性が誰か？すべての助けが大いに評価されます。

ありがとうございます。

Answer 1

WikipediaのXTEAページにはPHP implementationへのリンクがあります。 （下のダウンロードリンクを参照）。それは良いスタートになるはずです。

Answer 2

また、C++コードを保持し、それをPHPに埋め込む（それを埋め込む）方法を学ぶこともできます。私はPHPが動的にロードされた共有ライブラリの外部コードを呼び出すことができると思います。