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Clean up codec_encode.

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This commit is contained in:
Sergey Semushin 2019-05-18 19:57:20 +03:00 • committed by Anders Jenbo
commit 01bc47c7fc
2 changed files with 30 additions and 42 deletions
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70
Source/codec.cpp
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@ -87,52 +87,40 @@ DWORD codec_get_encoded_len(DWORD dwSrcBytes)
return dwSrcBytes + 8;
}
void codec_encode(void *pbSrcDst, int size, int size_64, char *pszPassword)
void codec_encode(BYTE* pbSrcDst, DWORD size, int size_64, char *pszPassword)
{
char *v4; // esi
char v5; // bl
size_t v6; // edi
signed int v7; // ecx
char v9[128]; // [esp+8h] [ebp-ACh]
char v10[20]; // [esp+88h] [ebp-2Ch]
char dst[20]; // [esp+9Ch] [ebp-18h]
size_t v12; // [esp+B0h] [ebp-4h]
char buf[128];
char tmp[20];
char dst[20];
DWORD chunk;
WORD last_chunk;
v4 = (char *)pbSrcDst;
v12 = size;
if (size_64 != codec_get_encoded_len(size))
app_fatal("Invalid encode parameters");
codec_init_key(1, pszPassword);
v5 = 0;
if (v12) {
do {
v6 = v12;
if (v12 >= 0x40)
v6 = 64;
memcpy(v9, v4, v6);
if (v6 < 0x40)
memset(&v9[v6], 0, 64 - v6);
SHA1Result(0, dst);
SHA1Calculate(0, v9, NULL);
v7 = 0;
do {
v9[v7] ^= dst[v7 % 20];
++v7;
} while (v7 < 64);
memset(dst, 0, sizeof(dst));
memcpy(v4, v9, 0x40u);
v4 += 64;
v12 -= v6;
} while (v12);
v5 = v6;
last_chunk = 0;
while (size != 0) {
chunk = size < 64 ? size : 64;
memcpy(buf, pbSrcDst, chunk);
if (chunk < 64)
memset(buf + chunk, 0, 64 - chunk);
SHA1Result(0, dst);
SHA1Calculate(0, buf, NULL);
for (int j = 0; j < 64; j++) {
buf[j] ^= dst[j % 20];
}
memset(dst, 0, sizeof(dst));
memcpy(pbSrcDst, buf, 64);
last_chunk = chunk;
pbSrcDst += 64;
size -= chunk;
}
memset(v9, 0, sizeof(v9));
SHA1Result(0, v10);
v4[4] = 0;
*((_WORD *)v4 + 3) = 0;
*(_DWORD *)v4 = *(_DWORD *)v10;
v4[5] = v5;
memset(buf, 0, sizeof(buf));
SHA1Result(0, tmp);
pbSrcDst[4] = 0;
((WORD *)pbSrcDst)[3] = 0;
((DWORD *)pbSrcDst)[0] = ((DWORD *)tmp)[0];
pbSrcDst[5] = last_chunk;
SHA1Clear();
}
// 4036BE: using guessed type char var_AC[128];
// 4036BE: using guessed type char dst[20];