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/*
* Skype Login
*
* Based on:
* FakeSkype : Skype reverse engineering proof-of-concept client
* Ouanilo MEDEGAN (c) 2006 http://www.oklabs.net
* pyskype : Skype login Python script by uunicorn
*
* Written by: leecher@dose.0wnz.at (c) 2015
*
* Module: Data creation functions, i.e. random data
*
*/
#include <string.h>
#include "common.h"
#include "random.h"
#include "platform.h"
#define skrand(x) ((x)*0x00010DCD+0x00004271)
unsigned int BytesSHA1(uchar *Data, uint Length)
{
uchar Buffer[SHA_DIGEST_LENGTH];
SHA_CTX Context;
SHA1_Init(&Context);
SHA1_Update(&Context, Data, Length);
SHA1_Final(Buffer, &Context);
return *(unsigned int *)Buffer;
}
int64_t BytesSHA1I64(uchar *Data, uint Length)
{
uchar Buffer[SHA_DIGEST_LENGTH];
SHA_CTX Context;
SHA1_Init(&Context);
SHA1_Update(&Context, Data, Length);
SHA1_Final(Buffer, &Context);
return *(int64_t *)Buffer;
}
unsigned int BytesRandom()
{
uchar Buffer[0x464];
FillRndBuffer(Buffer);
return BytesSHA1(Buffer, 0x464);
}
int64_t BytesRandomI64()
{
uchar Buffer[0x464];
FillRndBuffer(Buffer);
return BytesSHA1I64(Buffer, 0x464);
}
unsigned short BytesRandomWord()
{
unsigned short RandomW;
unsigned int RandomDW;
RandomDW = BytesRandom();
RandomW = *(unsigned short *)&RandomDW;
RandomW += 0;
return (RandomW);
}
void SpecialSHA(uchar *SessionKey, uint SkSz, uchar *SHAResult, uint ResSz)
{
SHA_CTX Context;
uchar Buffer[SHA_DIGEST_LENGTH];
char *Salts[] = {"\x00\x00\x00\x00", "\x00\x00\x00\x01"};
uint Idx = 0;
if (ResSz > 40)
return ;
while (ResSz > 20)
{
SHA1_Init(&Context);
SHA1_Update(&Context, Salts[Idx], 0x04);
SHA1_Update(&Context, SessionKey, SkSz);
SHA1_Final(Buffer, &Context);
memcpy(SHAResult + (Idx * SHA_DIGEST_LENGTH), Buffer, SHA_DIGEST_LENGTH);
Idx++;
ResSz -= SHA_DIGEST_LENGTH;
}
SHA1_Init(&Context);
SHA1_Update(&Context, Salts[Idx], 0x04);
SHA1_Update(&Context, SessionKey, SkSz);
SHA1_Final(Buffer, &Context);
memcpy(SHAResult + (Idx * SHA_DIGEST_LENGTH), Buffer, ResSz);
}
void BuildUnFinalizedDatas(uchar *Datas, uint Size, uchar *Result)
{
uchar *Mark;
uint Idx;
SHA_CTX MDCtx;
Result[0x00] = 0x4B;
for (Idx = 1; Idx < (0x80 - (Size + SHA_DIGEST_LENGTH) - 2); Idx++)
Result[Idx] = 0xBB;
Result[Idx++] = 0xBA;
Mark = Result + Idx;
memcpy(Result + Idx, Datas, Size);
Idx += Size;
SHA1_Init(&MDCtx);
SHA1_Update(&MDCtx, Mark, Size);
SHA1_Final(Result + Idx, &MDCtx);
Idx += SHA_DIGEST_LENGTH;
Result[Idx] = 0xBC;
}
uchar *FinalizeLoginDatas(Skype_Inst *pInst, uchar *Buffer, uint *Size, uchar *Suite, int SuiteSz)
{
int Idx;
uchar *Result;
SHA_CTX Context;
uchar SHARes[SHA_DIGEST_LENGTH] = {0};
Idx = 0;
if (Buffer[*Size - 1] != 0xBC)
return (NULL);
if (SuiteSz)
{
if (*Buffer != 0x6A)
return (NULL);
*Size = 0x6A + SuiteSz;
Idx += 1;
goto Copy;
}
while ((Buffer[Idx] & 0x0F) == 0x0B)
Idx++;
if ((Buffer[Idx] & 0x0F) != 0x0A)
return (NULL);
Idx += 1;
*Size = (*Size - 0x15) - Idx;
Copy:
Result = (uchar *)malloc(*Size);
memcpy(Result, Buffer + Idx, *Size - SuiteSz);
if (SuiteSz) memcpy(Result + (*Size - SuiteSz), Suite, SuiteSz);
SHA1_Init(&Context);
SHA1_Update(&Context, Result, *Size);
SHA1_Final(SHARes, &Context);
if (strncmp((char *)SHARes, (char *)(Buffer + Idx + (*Size - SuiteSz)), SHA_DIGEST_LENGTH))
{
pInst->pfLog(pInst->pLogStream, "Bad SHA Digest for unencrypted Datas..\n");
free(Result);
return (NULL);
}
return (Result);
}
void GenSessionKey(uchar *Buffer, uint Size)
{
uint Idx, Rander;
Rander = BytesRandom();
for (Idx = 0; Idx < Size; Idx++)
{
Rander = skrand(Rander);
Buffer[Idx] = ((uchar *)&Rander)[sizeof(Rander) - 1];
//Buffer[Idx] = (uchar)(Idx + 1);
}
Buffer[0] = 0x01;
}
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