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【译】Mix文件格式

版权

(这部分是 GPLv2 许可证声明版权的方式,中文译文来自网络。)
版权所有 © 2000 Olaf van der Spek
此程序是自由软件,你可以在自由软件基金会发布的 GNU 通用公共许可证V2版本(即 GPL v2 )下分发或修改它,或者根据您的需要使用更高版本。
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介绍

原作 Olaf van der Spek。这个文档介绍了被《命令与征服:泰伯利亚黎明》(以下简称TD)、《命令与征服:红色警戒》(以下简称RA)和《命令与征服:泰伯利亚之日》(以下简称TS)所使用的MIX文件格式。
MIX文件被用于存储其他的文件,类似于ZIP文件格式,但不会进行压缩。在这篇文档中我将会使用C++来演示。

typedef unsigned char byte;
typedef unsigned short word;
typedef unsigned long dword;

头(Header)

一个MIX文件由两部分组成,一个头(Header)和一个主体(Body)。头存储了关于文件数量、文件总大小和每个内部文件的ID、偏移量和大小的信息。
TD 的Mix文件没有使用加密,但 RA 和 TS 却在一部分的头(Header)上使用了河豚(Blowfish)加密。

struct t_mix_header
{
    __int16 c_files;        // 内部文件的数量
    __int32 size;        // 主体的大小,不包括头部和索引
};

在此之后,有一个关于MIX内部所有文件的索引。该索引由以上结构的 c_files 条目组成。

struct t_mix_index_entry
{
    unsigned __int32 id;        // ID,以此来标识文件而不是普通的名称
    __int32 offset;        // 从主体开始的偏移量
    __int32 size;        // 该文件的大小
};

在这个索引之后,实际的主体开始。
现在来说说 RA 或 TS 的 MIX。它们以一个 32 位的标志开始,表示其是否已经具有校验或者已加密。

const int mix_checksum = 0x00010000;
const int mix_encrypted = 0x00020000;

如果 MIX 带有校验,则意味着有 20 个字节在包含校验和(Checksum)的主体之后。这些可以忽略并删除。
如果 MIX 是加密的,则在名为,则有一个 80 字节的块在被称作 key_source 的标志之后。它可以被用于计算河豚加密的秘钥。如果 MIX 没有被加密,这个标志之后就是一个普通的 MIX 头。
好吧, MIX 头由河豚算法使用 56 字节的秘钥加密。这意味着在 key_source 之后,有许多的 8 字节的块需要被解密。你可以通过解密包含 MIX 头的第一个块来得知共有多少块。然后,你可以知道其中有多少文件,并且计算头和索引的大小。

ID

ID 用来识别每一个文件。它们可以从源文件名中计算出来。这里是两个不同版本的 ID 算法,一个是 TD 和 RA 的,另一个是 TS 的。我使用如下方法计算 ID 。(这里面用到了下文中的 CRC 算法)

int Cmix_file::get_id(t_game game, string name)
{
    name = to_upper(name);              // 转换为大写
    if (game != game_ts)
    {                                   // TD 和 RA 的算法
        int i = 0;
        unsigned int id = 0;
        int l = name.length();          // 文件名的长度
        while (i < l)
        {
            unsigned int a = 0;
            for (int j = 0; j < 4; j++)
            {
                a >>= 8;
                if (i < l)
                    a += static_cast<unsigned int>(name[i]) << 24;
                i++;
            }
            id = (id << 1 | id >> 31) + a;
        }
        return id;
    }
    else
    {                                    // TS 的算法
        const int l = name.length();
        int a = l >> 2;
        if (l & 3)
        {
            name += static_cast<char>(l - (a << 2));
            int i = 3 - (l & 3);
            while (i--)
                name += name[a << 2];
        }
        Ccrc crc;                        // 使用一个普通的 CRC 功能
        crc.init();
        crc.do_block(name.c_str(), name.length());
        return crc.get_crc();
    }
}

主体(Body)

主体包含未压缩且未加密的内部文件。

校验

目前所知的关于校验的唯一信息只有——它包含 20 个字节。你可以安全地删除它,如果你更改了标志。(也就是说这玩意没什么用)

河豚(Blowfish)

在 MIX 文件里面,河豚用来加/解密它的头。你可以使用这段代码来加/解密头。你首先需要使用 set_key 设定秘钥。这不是 80 字节的 key_source ,所以你需要先使用以下关于 WS 秘钥计算的代码算出秘钥。(下面代码用到了内联汇编,C#改写无力,不过还好现在有库了)

typedef dword t_bf_p[18];
typedef dword t_bf_s[4][256];

class Cblowfish
{
public:
    void set_key(const byte* key, int cb_key);
    void encipher(dword& xl, dword& xr) const;
    void encipher(const void* s, void* d, int size) const;
    void decipher(dword& xl, dword& xr) const;
    void decipher(const void* s, void* d, int size) const;
private:
    inline dword Cblowfish::S(dword x, int i) const;
    inline dword Cblowfish::bf_f(dword x) const;
    inline void Cblowfish::ROUND(dword& a, dword b, int n) const;

    t_bf_p m_p;
    t_bf_s m_s;
};

const t_bf_p p = {
    0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
    0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
    0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
    0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
    0x9216d5d9, 0x8979fb1b};

const t_bf_s s = {
    0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7,
    0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
    0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
    0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
    0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee,
    0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
    0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef,
    0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
    0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
    0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
    0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce,
    0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
    0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e,
    0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
    0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
    0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
    0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88,
    0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
    0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e,
    0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
    0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
    0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
    0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88,
    0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
    0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6,
    0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
    0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
    0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
    0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba,
    0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
    0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f,
    0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
    0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
    0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
    0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279,
    0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
    0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab,
    0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
    0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
    0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
    0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0,
    0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
    0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790,
    0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
    0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
    0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
    0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7,
    0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
    0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad,
    0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
    0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
    0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
    0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477,
    0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
    0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49,
    0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
    0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
    0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
    0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41,
    0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
    0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400,
    0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
    0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
    0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a,
    0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623,
    0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
    0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
    0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
    0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
    0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
    0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e,
    0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
    0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
    0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
    0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
    0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
    0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701,
    0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
    0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
    0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
    0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
    0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
    0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e,
    0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
    0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
    0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
    0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
    0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
    0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b,
    0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
    0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
    0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
    0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
    0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
    0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4,
    0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
    0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
    0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
    0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
    0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
    0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510,
    0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
    0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
    0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
    0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
    0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
    0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8,
    0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
    0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
    0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
    0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
    0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
    0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0,
    0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
    0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
    0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
    0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
    0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
    0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00,
    0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
    0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
    0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
    0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
    0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
    0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
    0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
    0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
    0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7,
    0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,
    0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
    0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
    0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
    0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45,
    0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
    0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
    0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
    0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
    0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
    0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42,
    0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
    0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
    0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
    0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
    0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
    0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33,
    0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
    0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
    0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
    0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
    0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
    0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b,
    0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
    0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
    0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
    0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
    0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
    0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37,
    0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
    0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
    0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
    0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
    0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
    0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d,
    0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
    0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
    0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
    0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
    0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
    0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d,
    0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
    0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
    0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
    0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
    0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
    0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2,
    0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
    0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
    0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
    0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
    0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
    0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52,
    0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
    0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
    0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
    0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
    0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
    0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24,
    0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
    0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
    0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
    0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
    0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0,
    0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b,
    0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
    0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
    0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
    0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8,
    0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
    0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304,
    0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
    0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
    0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
    0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9,
    0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
    0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593,
    0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
    0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
    0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
    0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b,
    0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
    0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c,
    0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
    0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
    0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
    0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb,
    0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
    0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991,
    0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
    0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
    0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
    0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae,
    0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
    0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5,
    0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
    0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
    0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
    0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84,
    0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
    0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8,
    0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
    0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
    0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
    0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38,
    0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
    0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c,
    0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
    0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
    0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
    0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964,
    0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
    0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8,
    0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
    0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
    0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
    0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02,
    0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
    0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614,
    0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
    0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
    0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
    0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0,
    0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
    0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e,
    0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
    0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
    0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6};

void Cblowfish::set_key(const byte* key, int cb_key)
{
    int i, j;
    dword datal, datar;

    memcpy(m_p, p, sizeof(t_bf_p));
    memcpy(m_s, s, sizeof(t_bf_s));

    j = 0;
    for (i = 0; i < 18; i++)
    {
        int a = key[j++]; j %= cb_key;
        int b = key[j++]; j %= cb_key;
        int c = key[j++]; j %= cb_key;
        int d = key[j++]; j %= cb_key;
        m_p[i] ^= a << 24 | b << 16 | c << 8 | d;
    }

    datal = datar = 0;

    for (i = 0; i < 18;)
    {
        encipher(datal, datar);

        m_p[i++] = datal;
        m_p[i++] = datar;
    }

    for (i = 0; i < 4; i++)
    {
        for (j = 0; j < 256;)
        {
            encipher(datal, datar);

            m_s[i][j++] = datal;
            m_s[i][j++] = datar;
        }
    }
}

inline dword Cblowfish::S(dword x, int i) const
{
    return m_s[i][(x >> ((3 - i) << 3)) & 0xff];
}

inline dword Cblowfish::bf_f(dword x) const
{
    return ((S(x, 0) + S(x, 1)) ^ S(x, 2)) + S(x, 3);
}

inline void Cblowfish::ROUND(dword& a, dword b, int n) const
{
    a ^= bf_f(b) ^ m_p[n];
}

void Cblowfish::encipher(dword& xl, dword& xr) const
{
    dword Xl = xl;
    dword Xr = xr;

    Xl ^= m_p[0];
    ROUND (Xr, Xl, 1);  ROUND (Xl, Xr, 2);
    ROUND (Xr, Xl, 3);  ROUND (Xl, Xr, 4);
    ROUND (Xr, Xl, 5);  ROUND (Xl, Xr, 6);
    ROUND (Xr, Xl, 7);  ROUND (Xl, Xr, 8);
    ROUND (Xr, Xl, 9);  ROUND (Xl, Xr, 10);
    ROUND (Xr, Xl, 11); ROUND (Xl, Xr, 12);
    ROUND (Xr, Xl, 13); ROUND (Xl, Xr, 14);
    ROUND (Xr, Xl, 15); ROUND (Xl, Xr, 16);
    Xr ^= m_p[17];

    xr = Xl;
    xl = Xr;
}

void Cblowfish::decipher(dword& xl, dword& xr) const
{
    dword  Xl = xl;
    dword  Xr = xr;

    Xl ^= m_p[17];
    ROUND (Xr, Xl, 16);  ROUND (Xl, Xr, 15);
    ROUND (Xr, Xl, 14);  ROUND (Xl, Xr, 13);
    ROUND (Xr, Xl, 12);  ROUND (Xl, Xr, 11);
    ROUND (Xr, Xl, 10);  ROUND (Xl, Xr, 9);
    ROUND (Xr, Xl, 8);   ROUND (Xl, Xr, 7);
    ROUND (Xr, Xl, 6);   ROUND (Xl, Xr, 5);
    ROUND (Xr, Xl, 4);   ROUND (Xl, Xr, 3);
    ROUND (Xr, Xl, 2);   ROUND (Xl, Xr, 1);
    Xr ^= m_p[0];

    xl = Xr;
    xr = Xl;
}

static inline dword reverse(dword v)
{
    _asm
    {
        mov        eax, v
        xchg    al, ah
        rol        eax, 16
        xchg    al, ah
        mov        v, eax
    }
    return v;
}

void Cblowfish::encipher(const void* s, void* d, int size) const
{
    const dword* r = reinterpret_cast<const dword*>(s);
    dword* w = reinterpret_cast<dword*>(d);
    size >>= 3;
    while (size--)
    {
        dword a = reverse(*r++);
        dword b = reverse(*r++);
        encipher(a, b);
        *w++ = reverse(a);
        *w++ = reverse(b);
    }
}

void Cblowfish::decipher(const void* s, void* d, int size) const
{
    const dword* r = reinterpret_cast<const dword*>(s);
    dword* w = reinterpret_cast<dword*>(d);
    size >>= 3;
    while (size--)
    {
        dword a = reverse(*r++);
        dword b = reverse(*r++);
        decipher(a, b);
        *w++ = reverse(a);
        *w++ = reverse(b);
    }
}

CRC

在 MIX 文件中, CRC 用来计算文件的 ID 。你可以使用以下代码计算文件名的 CRC ,同时你也可以用它来计算其他内容的 CRC ,例如任意一个文件,这和 ZIP 压缩算法使用的 CRC 相同。(现在也应该有现成的库了)

class Ccrc
{
public:
    void do_block(const void* data, int size);

    void init()
    {
        m_crc = 0;
    }

    int get_crc() const
    {
        return m_crc;
    }
private:
    unsigned int m_crc;
};

int crc_table[256] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
    0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
    0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
    0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
    0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
    0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
    0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
    0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
    0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
    0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
    0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
    0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
    0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
    0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
    0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
    0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
    0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
    0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};

void Ccrc::do_block(const void* data, int size)
{
    const unsigned char* r = reinterpret_cast<const unsigned char*>(data);
    m_crc = ~m_crc;
    while (size--)
        m_crc = (m_crc >> 8) ^ crc_table[*r++ ^ (m_crc & 0xff)];
    m_crc = ~m_crc;
}

WestWood Studio 秘钥的计算

这部分包含了 WS 秘钥的计算。它是一个函数,它需要输入 80 字节的 key_source 并输出一个 56 字节的秘钥。它使用了大量的整数运算。你需要调用的函数是 void get_blowfish_key(const byte* s, byte* d)

char *pubkey_str = "AihRvNoIbTn85FZRYNZRcT+i6KpU+maCsEqr3Q5q+LDB5tH7Tz2qQ38V";

const static char char2num[] = {
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};

typedef dword bignum4[4];
typedef dword bignum[64];
typedef dword bignum130[130];

struct
{
    bignum key1;
    bignum key2;
    dword len;
} pubkey;
bignum glob1;
dword glob1_bitlen, glob1_len_x2;
bignum130 glob2;
bignum4 glob1_hi, glob1_hi_inv;
dword glob1_hi_bitlen;
dword glob1_hi_inv_lo, glob1_hi_inv_hi;

static void init_bignum(bignum n, dword val, dword len)
{
    memset((void *)n, 0, len * 4);
    n[0] = val;
}

static void move_key_to_big(bignum n, char *key, dword klen, dword blen)
{
    dword sign;
    int i;

    if (key[0] & 0x80) sign = 0xff;
    else sign = 0;

    for (i = blen*4; i > klen; i--)
        ((char *)n)[i-1] = sign;
    for (; i > 0; i--)
        ((char *)n)[i-1] = key[klen-i];
}

static void key_to_bignum(bignum n, char *key, dword len)
{
    dword keylen;
    int i;

    if (key[0] != 2) return;
    key++;

    if (key[0] & 0x80)
    {
        keylen = 0;
        for (i = 0; i < (key[0] & 0x7f); i++) keylen = (keylen << 8) | key[i+1];
        key += (key[0] & 0x7f) + 1;
    }
    else
    {
        keylen = key[0];
        key++;
    }
    if (keylen <= len*4)
        move_key_to_big(n, key, keylen, len);
}

static dword len_bignum(bignum n, dword len)
{
  int i;
  i = len-1;
  while ((i >= 0) && (n[i] == 0)) i--;
  return i+1;
}

static dword bitlen_bignum(bignum n, dword len)
{
  dword ddlen, bitlen, mask;
  ddlen = len_bignum(n, len);
  if (ddlen == 0) return 0;
  bitlen = ddlen * 32;
  mask = 0x80000000;
  while ((mask & n[ddlen-1]) == 0) {
    mask >>= 1;
    bitlen--;
  }
  return bitlen;
}

static void init_pubkey()
{
    dword i, i2, tmp;
    char keytmp[256];

    init_bignum(pubkey.key2, 0x10001, 64);

    i = 0;
    i2 = 0;
    while (i < strlen(pubkey_str))
    {
        tmp = char2num[pubkey_str[i++]];
        tmp <<= 6; tmp |= char2num[pubkey_str[i++]];
        tmp <<= 6; tmp |= char2num[pubkey_str[i++]];
        tmp <<= 6; tmp |= char2num[pubkey_str[i++]];
        keytmp[i2++] = (tmp >> 16) & 0xff;
        keytmp[i2++] = (tmp >> 8) & 0xff;
        keytmp[i2++] = tmp & 0xff;
    }
    key_to_bignum(pubkey.key1, keytmp, 64);
    pubkey.len = bitlen_bignum(pubkey.key1, 64) - 1;
}

static dword len_predata()
{
    dword a = (pubkey.len - 1) / 8;
    return (55 / a + 1) * (a + 1);
}

static long int cmp_bignum(bignum n1, bignum n2, dword len)
{
  n1 += len-1;
  n2 += len-1;
  while (len > 0) {
    if (*n1 < *n2) return -1;
    if (*n1 > *n2) return 1;
    n1--;
    n2--;
    len--;
  }
  return 0;
}

static void mov_bignum(bignum dest, bignum src, dword len)
{
  memmove(dest, src, len*4);
}

static void shr_bignum(bignum n, dword bits, long int len)
{
  dword i, i2;

  i2 = bits / 32;
  if (i2 > 0) {
    for (i = 0; i < len - i2; i++) n[i] = n[i + i2];
    for (; i < len; i++) n[i] = 0;
    bits = bits % 32;
  }
  if (bits == 0) return;
  for (i = 0; i < len - 1; i++) n[i] = (n[i] >> bits) | (n[i + 1] << (32 -
bits));
  n[i] = n[i] >> bits;
}

static void shl_bignum(bignum n, dword bits, dword len)
{
  dword i, i2;

  i2 = bits / 32;
  if (i2 > 0) {
    for (i = len - 1; i > i2; i--) n[i] = n[i - i2];
    for (; i > 0; i--) n[i] = 0;
    bits = bits % 32;
  }
  if (bits == 0) return;
  for (i = len - 1; i > 0; i--) n[i] = (n[i] << bits) | (n[i - 1] >> (32 -
bits));
  n[0] <<= bits;
}

static dword sub_bignum(bignum dest, bignum src1, bignum src2, dword carry, dword len)
{
  dword i1, i2;

  len += len;
  while (--len != -1) {
    i1 = *(word *)src1;
    i2 = *(word *)src2;
    *(word *)dest = i1 - i2 - carry;
    src1 = (dword *)(((word *)src1) + 1);
    src2 = (dword *)(((word *)src2) + 1);
    dest = (dword *)(((word *)dest) + 1);
    if ((i1 - i2 - carry) & 0x10000) carry = 1; else carry = 0;
  }
  return carry;
}

static void inv_bignum(bignum n1, bignum n2, dword len)
{
  bignum n_tmp;
  dword n2_bytelen, bit;
  long int n2_bitlen;

  init_bignum(n_tmp, 0, len);
  init_bignum(n1, 0, len);
  n2_bitlen = bitlen_bignum(n2, len);
  bit = ((dword)1) << (n2_bitlen % 32);
  n1 += ((n2_bitlen + 32) / 32) - 1;
  n2_bytelen = ((n2_bitlen - 1) / 32) * 4;
  n_tmp[n2_bytelen / 4] |= ((dword)1) << ((n2_bitlen - 1) & 0x1f);

  while (n2_bitlen > 0) {
    n2_bitlen--;
    shl_bignum(n_tmp, 1, len);
    if (cmp_bignum(n_tmp, n2, len) != -1) {
      sub_bignum(n_tmp, n_tmp, n2, 0, len);
      *n1 |= bit;
    }
    bit >>= 1;
    if (bit == 0) {
      n1--;
      bit = 0x80000000;
    }
  }
  init_bignum(n_tmp, 0, len);
}

static void inc_bignum(bignum n, dword len)
{
  while ((++*n == 0) && (--len > 0)) n++;
}

static void init_two_dw(bignum n, dword len)
{
    mov_bignum(glob1, n, len);
    glob1_bitlen = bitlen_bignum(glob1, len);
    glob1_len_x2 = (glob1_bitlen + 15) / 16;
    mov_bignum(glob1_hi, glob1 + len_bignum(glob1, len) - 2, 2);
    glob1_hi_bitlen = bitlen_bignum(glob1_hi, 2) - 32;
    shr_bignum(glob1_hi, glob1_hi_bitlen, 2);
    inv_bignum(glob1_hi_inv, glob1_hi, 2);
    shr_bignum(glob1_hi_inv, 1, 2);
    glob1_hi_bitlen = (glob1_hi_bitlen + 15) % 16 + 1;
    inc_bignum(glob1_hi_inv, 2);
    if (bitlen_bignum(glob1_hi_inv, 2) > 32)
    {
        shr_bignum(glob1_hi_inv, 1, 2);
        glob1_hi_bitlen--;
    }
    glob1_hi_inv_lo = *(word *)glob1_hi_inv;
    glob1_hi_inv_hi = *(((word *)glob1_hi_inv) + 1);
}

static void mul_bignum_word(bignum n1, bignum n2, dword mul, dword len)
{
  dword i, tmp;

  tmp = 0;
  for (i = 0; i < len; i++) {
    tmp = mul * (*(word *)n2) + *(word *)n1 + tmp;
    *(word *)n1 = tmp;
    n1 = (dword *)(((word *)n1) + 1);
    n2 = (dword *)(((word *)n2) + 1);
    tmp >>= 16;
  }
  *(word *)n1 += tmp;
}

static void mul_bignum(bignum dest, bignum src1, bignum src2, dword len)
{
  dword i;

  init_bignum(dest, 0, len*2);
  for (i = 0; i < len*2; i++) {
    mul_bignum_word(dest, src1, *(word *)src2, len*2);
    src2 = (dword *)(((word *)src2) + 1);
    dest = (dword *)(((word *)dest) + 1);
  }
}

static void not_bignum(bignum n, dword len)
{
  dword i;
  for (i = 0; i < len; i++) *(n++) = ~*n;
}

static void neg_bignum(bignum n, dword len)
{
  not_bignum(n, len);
  inc_bignum(n, len);
}

static dword get_mulword(bignum n)
{
  dword i;
  word *wn;

  wn = (word *)n;
  i = (((((((((*(wn-1) ^ 0xffff) & 0xffff) * glob1_hi_inv_lo + 0x10000) >> 1)
      + (((*(wn-2) ^ 0xffff) * glob1_hi_inv_hi + glob1_hi_inv_hi) >> 1) + 1)
      >> 16) + ((((*(wn-1) ^ 0xffff) & 0xffff) * glob1_hi_inv_hi) >> 1) +
      (((*wn ^ 0xffff) * glob1_hi_inv_lo) >> 1) + 1) >> 14) + glob1_hi_inv_hi
      * (*wn ^ 0xffff) * 2) >> glob1_hi_bitlen;
  if (i > 0xffff) i = 0xffff;
  return i & 0xffff;
}

static void dec_bignum(bignum n, dword len)
{
    while ((--*n == 0xffffffff) && (--len > 0))
        n++;
}

static void calc_a_bignum(bignum n1, bignum n2, bignum n3, dword len)
{
    dword g2_len_x2, len_diff;
    word *esi, *edi;
    word tmp;

    mul_bignum(glob2, n2, n3, len);
    glob2[len*2] = 0;
    g2_len_x2 = len_bignum(glob2, len*2+1)*2;
    if (g2_len_x2 >= glob1_len_x2) {
        inc_bignum(glob2, len*2+1);
        neg_bignum(glob2, len*2+1);
        len_diff = g2_len_x2 + 1 - glob1_len_x2;
        esi = ((word *)glob2) + (1 + g2_len_x2 - glob1_len_x2);
        edi = ((word *)glob2) + (g2_len_x2 + 1);
        for (; len_diff != 0; len_diff--) {
            edi--;
            tmp = get_mulword((dword *)edi);
            esi--;
            if (tmp > 0) {
                mul_bignum_word((dword *)esi, glob1, tmp, 2*len);
                if ((*edi & 0x8000) == 0) {
                    if (sub_bignum((dword *)esi, (dword *)esi, glob1, 0, len)) (*edi)--;
                }
            }
        }
        neg_bignum(glob2, len);
        dec_bignum(glob2, len);
    }
    mov_bignum(n1, glob2, len);
}

static void clear_tmp_vars(dword len)
{
    init_bignum(glob1, 0, len);
    init_bignum(glob2, 0, len);
    init_bignum(glob1_hi_inv, 0, 4);
    init_bignum(glob1_hi, 0, 4);
    glob1_bitlen = 0;
    glob1_hi_bitlen = 0;
    glob1_len_x2 = 0;
    glob1_hi_inv_lo = 0;
    glob1_hi_inv_hi = 0;
}

static void calc_a_key(bignum n1, bignum n2, bignum n3, bignum n4, dword len)
{
    bignum n_tmp;
    dword n3_len, n4_len, n3_bitlen, bit_mask;

    init_bignum(n1, 1, len);
    n4_len = len_bignum(n4, len);
    init_two_dw(n4, n4_len);
    n3_bitlen = bitlen_bignum(n3, n4_len);
    n3_len = (n3_bitlen + 31) / 32;
    bit_mask = (((dword)1) << ((n3_bitlen - 1) % 32)) >> 1;
    n3 += n3_len - 1;
    n3_bitlen--;
    mov_bignum(n1, n2, n4_len);
    while (--n3_bitlen != -1)
    {
        if (bit_mask == 0)
        {
            bit_mask = 0x80000000;
            n3--;
        }
        calc_a_bignum(n_tmp, n1, n1, n4_len);
        if (*n3 & bit_mask)
            calc_a_bignum(n1, n_tmp, n2, n4_len);
        else
            mov_bignum(n1, n_tmp, n4_len);
        bit_mask >>= 1;
    }
    init_bignum(n_tmp, 0, n4_len);
    clear_tmp_vars(len);
}

static void process_predata(const byte* pre, dword pre_len, byte *buf)
{
    bignum n2, n3;
    const dword a = (pubkey.len - 1) / 8;
    while (a + 1 <= pre_len)
    {
        init_bignum(n2, 0, 64);
        memmove(n2, pre, a + 1);
        calc_a_key(n3, n2, pubkey.key2, pubkey.key1, 64);

        memmove(buf, n3, a);

        pre_len -= a + 1;
        pre += a + 1;
        buf += a;
    }
}

void get_blowfish_key(const byte* s, byte* d)
{
    static public_key_initialized = false;
    if (!public_key_initialized)
    {
        init_pubkey();
        public_key_initialized = true;
    }
    byte key[256];
    process_predata(s, len_predata(), key);
    memcpy(d, key, 56);
}

相关链接

http://www.counterpane.com/blowfish.html

译注

上文中,中文括号里面的都是浅墨的注释。
浅墨之所以想要翻译这篇文章,是因为很久之前,浅墨在研究 MIX 文件格式并尝试用 C# 写一个 XCC 工具包,发现没有中文的介绍 MIX 文件格式的文章,所以浅墨就打算翻译,咕了很久终于是弄出来了。
原文链接 http://xhp.xwis.net/documents/MIX_Format.html

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