9 files changed, 753 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.cpp b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.cpp
new file mode 100644
index 0000000000..f412bf9d14
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.cpp
@@ -0,0 +1,280 @@
+// 7zAes.cpp
+
+#include "StdAfx.h"
+
+#include "../../../C/Sha256.h"
+
+#include "../../Common/ComTry.h"
+
+#ifndef _7ZIP_ST
+#include "../../Windows/Synchronization.h"
+#endif
+
+#include "../Common/StreamUtils.h"
+
+#include "7zAes.h"
+#include "MyAes.h"
+
+#ifndef EXTRACT_ONLY
+#include "RandGen.h"
+#endif
+
+namespace NCrypto {
+namespace N7z {
+
+static const unsigned k_NumCyclesPower_Supported_MAX = 24;
+
+bool CKeyInfo::IsEqualTo(const CKeyInfo &a) const
+{
+  if (SaltSize != a.SaltSize || NumCyclesPower != a.NumCyclesPower)
+    return false;
+  for (unsigned i = 0; i < SaltSize; i++)
+    if (Salt[i] != a.Salt[i])
+      return false;
+  return (Password == a.Password);
+}
+
+void CKeyInfo::CalcKey()
+{
+  if (NumCyclesPower == 0x3F)
+  {
+    unsigned pos;
+    for (pos = 0; pos < SaltSize; pos++)
+      Key[pos] = Salt[pos];
+    for (unsigned i = 0; i < Password.Size() && pos < kKeySize; i++)
+      Key[pos++] = Password[i];
+    for (; pos < kKeySize; pos++)
+      Key[pos] = 0;
+  }
+  else
+  {
+    size_t bufSize = 8 + SaltSize + Password.Size();
+    CObjArray<Byte> buf(bufSize);
+    memcpy(buf, Salt, SaltSize);
+    memcpy(buf + SaltSize, Password, Password.Size());
+    
+    CSha256 sha;
+    Sha256_Init(&sha);
+    
+    Byte *ctr = buf + SaltSize + Password.Size();
+    
+    for (unsigned i = 0; i < 8; i++)
+      ctr[i] = 0;
+    
+    UInt64 numRounds = (UInt64)1 << NumCyclesPower;
+
+    do
+    {
+      Sha256_Update(&sha, buf, bufSize);
+      for (unsigned i = 0; i < 8; i++)
+        if (++(ctr[i]) != 0)
+          break;
+    }
+    while (--numRounds != 0);
+
+    Sha256_Final(&sha, Key);
+  }
+}
+
+bool CKeyInfoCache::GetKey(CKeyInfo &key)
+{
+  FOR_VECTOR (i, Keys)
+  {
+    const CKeyInfo &cached = Keys[i];
+    if (key.IsEqualTo(cached))
+    {
+      for (unsigned j = 0; j < kKeySize; j++)
+        key.Key[j] = cached.Key[j];
+      if (i != 0)
+        Keys.MoveToFront(i);
+      return true;
+    }
+  }
+  return false;
+}
+
+void CKeyInfoCache::FindAndAdd(const CKeyInfo &key)
+{
+  FOR_VECTOR (i, Keys)
+  {
+    const CKeyInfo &cached = Keys[i];
+    if (key.IsEqualTo(cached))
+    {
+      if (i != 0)
+        Keys.MoveToFront(i);
+      return;
+    }
+  }
+  Add(key);
+}
+
+void CKeyInfoCache::Add(const CKeyInfo &key)
+{
+  if (Keys.Size() >= Size)
+    Keys.DeleteBack();
+  Keys.Insert(0, key);
+}
+
+static CKeyInfoCache g_GlobalKeyCache(32);
+
+#ifndef _7ZIP_ST
+  static NWindows::NSynchronization::CCriticalSection g_GlobalKeyCacheCriticalSection;
+  #define MT_LOCK NWindows::NSynchronization::CCriticalSectionLock lock(g_GlobalKeyCacheCriticalSection);
+#else
+  #define MT_LOCK
+#endif
+
+CBase::CBase():
+  _cachedKeys(16),
+  _ivSize(0)
+{
+  for (unsigned i = 0; i < sizeof(_iv); i++)
+    _iv[i] = 0;
+}
+
+void CBase::PrepareKey()
+{
+  // BCJ2 threads use same password. So we use long lock.
+  MT_LOCK
+  
+  bool finded = false;
+  if (!_cachedKeys.GetKey(_key))
+  {
+    finded = g_GlobalKeyCache.GetKey(_key);
+    if (!finded)
+      _key.CalcKey();
+    _cachedKeys.Add(_key);
+  }
+  if (!finded)
+    g_GlobalKeyCache.FindAndAdd(_key);
+}
+
+#ifndef EXTRACT_ONLY
+
+/*
+STDMETHODIMP CEncoder::ResetSalt()
+{
+  _key.SaltSize = 4;
+  g_RandomGenerator.Generate(_key.Salt, _key.SaltSize);
+  return S_OK;
+}
+*/
+
+STDMETHODIMP CEncoder::ResetInitVector()
+{
+  for (unsigned i = 0; i < sizeof(_iv); i++)
+    _iv[i] = 0;
+  _ivSize = 8;
+  g_RandomGenerator.Generate(_iv, _ivSize);
+  return S_OK;
+}
+
+STDMETHODIMP CEncoder::WriteCoderProperties(ISequentialOutStream *outStream)
+{
+  Byte props[2 + sizeof(_key.Salt) + sizeof(_iv)];
+  unsigned propsSize = 1;
+
+  props[0] = (Byte)(_key.NumCyclesPower
+      | (_key.SaltSize == 0 ? 0 : (1 << 7))
+      | (_ivSize       == 0 ? 0 : (1 << 6)));
+
+  if (_key.SaltSize != 0 || _ivSize != 0)
+  {
+    props[1] = (Byte)(
+        ((_key.SaltSize == 0 ? 0 : _key.SaltSize - 1) << 4)
+        | (_ivSize      == 0 ? 0 : _ivSize - 1));
+    memcpy(props + 2, _key.Salt, _key.SaltSize);
+    propsSize = 2 + _key.SaltSize;
+    memcpy(props + propsSize, _iv, _ivSize);
+    propsSize += _ivSize;
+  }
+
+  return WriteStream(outStream, props, propsSize);
+}
+
+CEncoder::CEncoder()
+{
+  // _key.SaltSize = 4; g_RandomGenerator.Generate(_key.Salt, _key.SaltSize);
+  // _key.NumCyclesPower = 0x3F;
+  _key.NumCyclesPower = 19;
+  _aesFilter = new CAesCbcEncoder(kKeySize);
+}
+
+#endif
+
+CDecoder::CDecoder()
+{
+  _aesFilter = new CAesCbcDecoder(kKeySize);
+}
+
+STDMETHODIMP CDecoder::SetDecoderProperties2(const Byte *data, UInt32 size)
+{
+  _key.ClearProps();
+ 
+  _ivSize = 0;
+  unsigned i;
+  for (i = 0; i < sizeof(_iv); i++)
+    _iv[i] = 0;
+  
+  if (size == 0)
+    return S_OK;
+  
+  Byte b0 = data[0];
+
+  _key.NumCyclesPower = b0 & 0x3F;
+  if ((b0 & 0xC0) == 0)
+    return size == 1 ? S_OK : E_INVALIDARG;
+
+  if (size <= 1)
+    return E_INVALIDARG;
+
+  Byte b1 = data[1];
+
+  unsigned saltSize = ((b0 >> 7) & 1) + (b1 >> 4);
+  unsigned ivSize   = ((b0 >> 6) & 1) + (b1 & 0x0F);
+  
+  if (size != 2 + saltSize + ivSize)
+    return E_INVALIDARG;
+  _key.SaltSize = saltSize;
+  data += 2;
+  for (i = 0; i < saltSize; i++)
+    _key.Salt[i] = *data++;
+  for (i = 0; i < ivSize; i++)
+    _iv[i] = *data++;
+  return (_key.NumCyclesPower <= k_NumCyclesPower_Supported_MAX
+      || _key.NumCyclesPower == 0x3F) ? S_OK : E_NOTIMPL;
+}
+
+
+STDMETHODIMP CBaseCoder::CryptoSetPassword(const Byte *data, UInt32 size)
+{
+  COM_TRY_BEGIN
+  
+  _key.Password.CopyFrom(data, (size_t)size);
+  return S_OK;
+  
+  COM_TRY_END
+}
+
+STDMETHODIMP CBaseCoder::Init()
+{
+  COM_TRY_BEGIN
+  
+  PrepareKey();
+  CMyComPtr<ICryptoProperties> cp;
+  RINOK(_aesFilter.QueryInterface(IID_ICryptoProperties, &cp));
+  if (!cp)
+    return E_FAIL;
+  RINOK(cp->SetKey(_key.Key, kKeySize));
+  RINOK(cp->SetInitVector(_iv, sizeof(_iv)));
+  return _aesFilter->Init();
+  
+  COM_TRY_END
+}
+
+STDMETHODIMP_(UInt32) CBaseCoder::Filter(Byte *data, UInt32 size)
+{
+  return _aesFilter->Filter(data, size);
+}
+
+}}
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.h b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.h
new file mode 100644
index 0000000000..5a09436079
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAes.h
@@ -0,0 +1,118 @@
+// 7zAes.h
+
+#ifndef __CRYPTO_7Z_AES_H
+#define __CRYPTO_7Z_AES_H
+
+#include "../../Common/MyBuffer.h"
+#include "../../Common/MyCom.h"
+#include "../../Common/MyVector.h"
+
+#include "../ICoder.h"
+#include "../IPassword.h"
+
+namespace NCrypto {
+namespace N7z {
+
+const unsigned kKeySize = 32;
+const unsigned kSaltSizeMax = 16;
+const unsigned kIvSizeMax = 16; // AES_BLOCK_SIZE;
+
+class CKeyInfo
+{
+public:
+  unsigned NumCyclesPower;
+  unsigned SaltSize;
+  Byte Salt[kSaltSizeMax];
+  CByteBuffer Password;
+  Byte Key[kKeySize];
+
+  bool IsEqualTo(const CKeyInfo &a) const;
+  void CalcKey();
+
+  CKeyInfo() { ClearProps(); }
+  void ClearProps()
+  {
+    NumCyclesPower = 0;
+    SaltSize = 0;
+    for (unsigned i = 0; i < sizeof(Salt); i++)
+      Salt[i] = 0;
+  }
+};
+
+class CKeyInfoCache
+{
+  unsigned Size;
+  CObjectVector<CKeyInfo> Keys;
+public:
+  CKeyInfoCache(unsigned size): Size(size) {}
+  bool GetKey(CKeyInfo &key);
+  void Add(const CKeyInfo &key);
+  void FindAndAdd(const CKeyInfo &key);
+};
+
+class CBase
+{
+  CKeyInfoCache _cachedKeys;
+protected:
+  CKeyInfo _key;
+  Byte _iv[kIvSizeMax];
+  unsigned _ivSize;
+  
+  void PrepareKey();
+  CBase();
+};
+
+class CBaseCoder:
+  public ICompressFilter,
+  public ICryptoSetPassword,
+  public CMyUnknownImp,
+  public CBase
+{
+protected:
+  CMyComPtr<ICompressFilter> _aesFilter;
+
+public:
+  INTERFACE_ICompressFilter(;)
+  
+  STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
+};
+
+#ifndef EXTRACT_ONLY
+
+class CEncoder:
+  public CBaseCoder,
+  public ICompressWriteCoderProperties,
+  // public ICryptoResetSalt,
+  public ICryptoResetInitVector
+{
+public:
+  MY_UNKNOWN_IMP4(
+      ICompressFilter,
+      ICryptoSetPassword,
+      ICompressWriteCoderProperties,
+      // ICryptoResetSalt,
+      ICryptoResetInitVector)
+  STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream);
+  // STDMETHOD(ResetSalt)();
+  STDMETHOD(ResetInitVector)();
+  CEncoder();
+};
+
+#endif
+
+class CDecoder:
+  public CBaseCoder,
+  public ICompressSetDecoderProperties2
+{
+public:
+  MY_UNKNOWN_IMP3(
+      ICompressFilter,
+      ICryptoSetPassword,
+      ICompressSetDecoderProperties2)
+  STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size);
+  CDecoder();
+};
+
+}}
+
+#endif
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAesRegister.cpp b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAesRegister.cpp
new file mode 100644
index 0000000000..c0b2060939
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/7zAesRegister.cpp
@@ -0,0 +1,17 @@
+// 7zAesRegister.cpp
+
+#include "StdAfx.h"
+
+#include "../Common/RegisterCodec.h"
+
+#include "7zAes.h"
+
+namespace NCrypto {
+namespace N7z {
+
+REGISTER_FILTER_E(7zAES,
+    CDecoder(),
+    CEncoder(),
+    0x6F10701, "7zAES")
+
+}}
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.cpp b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.cpp
new file mode 100644
index 0000000000..1d399d707f
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.cpp
@@ -0,0 +1,112 @@
+// Crypto/MyAes.cpp
+
+#include "StdAfx.h"
+
+#include "../../../C/CpuArch.h"
+
+#include "MyAes.h"
+
+namespace NCrypto {
+
+static struct CAesTabInit { CAesTabInit() { AesGenTables();} } g_AesTabInit;
+
+CAesCbcCoder::CAesCbcCoder(bool encodeMode, unsigned keySize):
+  _keySize(keySize),
+  _keyIsSet(false),
+  _encodeMode(encodeMode)
+{
+  _offset = ((0 - (unsigned)(ptrdiff_t)_aes) & 0xF) / sizeof(UInt32);
+  memset(_iv, 0, AES_BLOCK_SIZE);
+  SetFunctions(0);
+}
+
+STDMETHODIMP CAesCbcCoder::Init()
+{
+  AesCbc_Init(_aes + _offset, _iv);
+  return _keyIsSet ? S_OK : E_FAIL;
+}
+
+STDMETHODIMP_(UInt32) CAesCbcCoder::Filter(Byte *data, UInt32 size)
+{
+  if (!_keyIsSet)
+    return 0;
+  if (size == 0)
+    return 0;
+  if (size < AES_BLOCK_SIZE)
+    return AES_BLOCK_SIZE;
+  size >>= 4;
+  _codeFunc(_aes + _offset, data, size);
+  return size << 4;
+}
+
+STDMETHODIMP CAesCbcCoder::SetKey(const Byte *data, UInt32 size)
+{
+  if ((size & 0x7) != 0 || size < 16 || size > 32)
+    return E_INVALIDARG;
+  if (_keySize != 0 && size != _keySize)
+    return E_INVALIDARG;
+  AES_SET_KEY_FUNC setKeyFunc = _encodeMode ? Aes_SetKey_Enc : Aes_SetKey_Dec;
+  setKeyFunc(_aes + _offset + 4, data, size);
+  _keyIsSet = true;
+  return S_OK;
+}
+
+STDMETHODIMP CAesCbcCoder::SetInitVector(const Byte *data, UInt32 size)
+{
+  if (size != AES_BLOCK_SIZE)
+    return E_INVALIDARG;
+  memcpy(_iv, data, size);
+  CAesCbcCoder::Init(); // don't call virtual function here !!!
+  return S_OK;
+}
+
+EXTERN_C_BEGIN
+
+void MY_FAST_CALL AesCbc_Encode(UInt32 *ivAes, Byte *data, size_t numBlocks);
+void MY_FAST_CALL AesCbc_Decode(UInt32 *ivAes, Byte *data, size_t numBlocks);
+void MY_FAST_CALL AesCtr_Code(UInt32 *ivAes, Byte *data, size_t numBlocks);
+
+void MY_FAST_CALL AesCbc_Encode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);
+void MY_FAST_CALL AesCbc_Decode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);
+void MY_FAST_CALL AesCtr_Code_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);
+
+EXTERN_C_END
+
+bool CAesCbcCoder::SetFunctions(UInt32 algo)
+{
+  _codeFunc = _encodeMode ?
+      g_AesCbc_Encode :
+      g_AesCbc_Decode;
+  if (algo == 1)
+  {
+    _codeFunc = _encodeMode ?
+        AesCbc_Encode:
+        AesCbc_Decode;
+  }
+  if (algo == 2)
+  {
+    #ifdef MY_CPU_X86_OR_AMD64
+    if (g_AesCbc_Encode != AesCbc_Encode_Intel)
+    #endif
+      return false;
+  }
+  return true;
+}
+
+STDMETHODIMP CAesCbcCoder::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *coderProps, UInt32 numProps)
+{
+  for (UInt32 i = 0; i < numProps; i++)
+  {
+    const PROPVARIANT &prop = coderProps[i];
+    if (propIDs[i] == NCoderPropID::kDefaultProp)
+    {
+      if (prop.vt != VT_UI4)
+        return E_INVALIDARG;
+      if (!SetFunctions(prop.ulVal))
+        return E_NOTIMPL;
+    }
+  }
+  return S_OK;
+}
+
+}
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.h b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.h
new file mode 100644
index 0000000000..8d5ed98c3f
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAes.h
@@ -0,0 +1,57 @@
+// Crypto/MyAes.h
+
+#ifndef __CRYPTO_MY_AES_H
+#define __CRYPTO_MY_AES_H
+
+#include "../../../C/Aes.h"
+
+#include "../../Common/MyCom.h"
+
+#include "../ICoder.h"
+
+namespace NCrypto {
+
+class CAesCbcCoder:
+  public ICompressFilter,
+  public ICryptoProperties,
+  public ICompressSetCoderProperties,
+  public CMyUnknownImp
+{
+  AES_CODE_FUNC _codeFunc;
+  unsigned _offset;
+  unsigned _keySize;
+  bool _keyIsSet;
+  bool _encodeMode;
+  UInt32 _aes[AES_NUM_IVMRK_WORDS + 3];
+  Byte _iv[AES_BLOCK_SIZE];
+
+  bool SetFunctions(UInt32 algo);
+
+public:
+  CAesCbcCoder(bool encodeMode, unsigned keySize);
+  
+  virtual ~CAesCbcCoder() {};   // we need virtual destructor for derived classes
+  
+  MY_UNKNOWN_IMP3(ICompressFilter, ICryptoProperties, ICompressSetCoderProperties)
+  
+  INTERFACE_ICompressFilter(;)
+  
+  STDMETHOD(SetKey)(const Byte *data, UInt32 size);
+  STDMETHOD(SetInitVector)(const Byte *data, UInt32 size);
+  
+  STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
+};
+
+struct CAesCbcEncoder: public CAesCbcCoder
+{
+  CAesCbcEncoder(unsigned keySize = 0): CAesCbcCoder(true, keySize) {}
+};
+
+struct CAesCbcDecoder: public CAesCbcCoder
+{
+  CAesCbcDecoder(unsigned keySize = 0): CAesCbcCoder(false, keySize) {}
+};
+
+}
+
+#endif
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAesReg.cpp b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAesReg.cpp
new file mode 100644
index 0000000000..3427ad6257
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/MyAesReg.cpp
@@ -0,0 +1,16 @@
+// MyAesReg.cpp
+
+#include "StdAfx.h"
+
+#include "../Common/RegisterCodec.h"
+
+#include "MyAes.h"
+
+namespace NCrypto {
+
+REGISTER_FILTER_E(AES256CBC,
+    CAesCbcDecoder(32),
+    CAesCbcEncoder(32),
+    0x6F00181, "AES256CBC")
+
+}
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.cpp b/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.cpp
new file mode 100644
index 0000000000..542f39bd56
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.cpp
@@ -0,0 +1,124 @@
+// RandGen.cpp
+
+#include "StdAfx.h"
+
+#ifndef _7ZIP_ST
+#include "../../Windows/Synchronization.h"
+#endif
+
+#include "RandGen.h"
+
+#ifndef _WIN32
+#include <unistd.h>
+#define USE_POSIX_TIME
+#define USE_POSIX_TIME2
+#endif
+
+#ifdef USE_POSIX_TIME
+#include <time.h>
+#ifdef USE_POSIX_TIME2
+#include <sys/time.h>
+#endif
+#endif
+
+// This is not very good random number generator.
+// Please use it only for salt.
+// First generated data block depends from timer and processID.
+// Other generated data blocks depend from previous state
+// Maybe it's possible to restore original timer value from generated value.
+
+#define HASH_UPD(x) Sha256_Update(&hash, (const Byte *)&x, sizeof(x));
+
+void CRandomGenerator::Init()
+{
+  CSha256 hash;
+  Sha256_Init(&hash);
+
+  #ifdef _WIN32
+  DWORD w = ::GetCurrentProcessId();
+  HASH_UPD(w);
+  w = ::GetCurrentThreadId();
+  HASH_UPD(w);
+  #else
+  pid_t pid = getpid();
+  HASH_UPD(pid);
+  pid = getppid();
+  HASH_UPD(pid);
+  #endif
+
+  for (unsigned i = 0; i <
+    #ifdef _DEBUG
+    2;
+    #else
+    1000;
+    #endif
+    i++)
+  {
+    #ifdef _WIN32
+    LARGE_INTEGER v;
+    if (::QueryPerformanceCounter(&v))
+      HASH_UPD(v.QuadPart);
+    #endif
+
+    #ifdef USE_POSIX_TIME
+    #ifdef USE_POSIX_TIME2
+    timeval v;
+    if (gettimeofday(&v, 0) == 0)
+    {
+      HASH_UPD(v.tv_sec);
+      HASH_UPD(v.tv_usec);
+    }
+    #endif
+    time_t v2 = time(NULL);
+    HASH_UPD(v2);
+    #endif
+
+    #ifdef _WIN32
+    DWORD tickCount = ::GetTickCount();
+    HASH_UPD(tickCount);
+    #endif
+    
+    for (unsigned j = 0; j < 100; j++)
+    {
+      Sha256_Final(&hash, _buff);
+      Sha256_Init(&hash);
+      Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
+    }
+  }
+  Sha256_Final(&hash, _buff);
+  _needInit = false;
+}
+
+#ifndef _7ZIP_ST
+  static NWindows::NSynchronization::CCriticalSection g_CriticalSection;
+  #define MT_LOCK NWindows::NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
+#else
+  #define MT_LOCK
+#endif
+
+void CRandomGenerator::Generate(Byte *data, unsigned size)
+{
+  MT_LOCK
+
+  if (_needInit)
+    Init();
+  while (size != 0)
+  {
+    CSha256 hash;
+    
+    Sha256_Init(&hash);
+    Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
+    Sha256_Final(&hash, _buff);
+    
+    Sha256_Init(&hash);
+    UInt32 salt = 0xF672ABD1;
+    HASH_UPD(salt);
+    Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
+    Byte buff[SHA256_DIGEST_SIZE];
+    Sha256_Final(&hash, buff);
+    for (unsigned i = 0; i < SHA256_DIGEST_SIZE && size != 0; i++, size--)
+      *data++ = buff[i];
+  }
+}
+
+CRandomGenerator g_RandomGenerator;
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.h b/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.h
new file mode 100644
index 0000000000..ff44450f8f
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/RandGen.h
@@ -0,0 +1,21 @@
+// RandGen.h
+
+#ifndef __CRYPTO_RAND_GEN_H
+#define __CRYPTO_RAND_GEN_H
+
+#include "../../../C/Sha256.h"
+
+class CRandomGenerator
+{
+  Byte _buff[SHA256_DIGEST_SIZE];
+  bool _needInit;
+
+  void Init();
+public:
+  CRandomGenerator(): _needInit(true) {};
+  void Generate(Byte *data, unsigned size);
+};
+
+extern CRandomGenerator g_RandomGenerator;
+
+#endif
diff --git a/other-licenses/7zstub/src/CPP/7zip/Crypto/StdAfx.h b/other-licenses/7zstub/src/CPP/7zip/Crypto/StdAfx.h
new file mode 100644
index 0000000000..42a088f121
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Crypto/StdAfx.h
@@ -0,0 +1,8 @@
+// StdAfx.h
+
+#ifndef __STDAFX_H
+#define __STDAFX_H
+
+#include "../../Common/Common.h"
+
+#endif