[Bug 47480] New: Rhinoceros 6 (.NET 4.x app) crashes in rsaenh during local license file validation
https://bugs.winehq.org/show_bug.cgi?id=47480 Bug ID: 47480 Summary: Rhinoceros 6 (.NET 4.x app) crashes in rsaenh during local license file validation Product: Wine Version: 4.12 Hardware: x86-64 OS: Linux Status: NEW Severity: normal Priority: P2 Component: rsaenh Assignee: wine-bugs(a)winehq.org Reporter: focht(a)gmx.net Distribution: --- Hello folks, as it says. Prerequisites: * .NET Framework 4.5.x ('winetricks -q dotnet452') The app installer downloads and installs MS VC++ 2005, 2010, 2013, 2017 runtime redistributables on its own. --- snip --- $ pwd /home/focht/.wine/drive_c/Program Files/Rhino 6/System $ WINEDEBUG=+seh,+loaddll,+process,+relay,+crypt wine ./Rhino.exe >>log.txt 2>&1 ... 00fd:Call advapi32.CryptImportKey(02499d30,103ab638,0000002c,00000000,00000001,0024a648) ret=0c7855dc 00fd:trace:crypt:CryptImportKey (0x2499d30, 0x103ab638, 44, 0x0, 00000001, 0x24a648) 00fd:Call rsaenh.CPImportKey(00000005,103ab638,0000002c,00000000,00000001,02499cf0) ret=7f515c928426 00fd:trace:crypt:RSAENH_CPImportKey (hProv=00000005, pbData=00000000103AB638, dwDataLen=44, hPubKey=00000000, dwFlags=00000001, phKey=0000000002499CF0) 00fd:trace:crypt:import_key blob type: 8 00fd:Call KERNEL32.IsBadStringPtrA(6652bb20,ffffffffffffffff) ret=6650c54b 00fd:Ret KERNEL32.IsBadStringPtrA() retval=00000000 ret=6650c54b 00fd:trace:crypt:new_key alg = "AES-256", dwKeyLen = 256 00fd:Call ntdll.RtlAllocateHeap(00010000,00000000,00000408) ret=665033c4 00fd:Ret ntdll.RtlAllocateHeap() retval=024e5020 ret=665033c4 00fd:Call msvcrt.memcpy(024e5360,103ab644,00000020) ret=665130b7 00fd:Ret msvcrt.memcpy() retval=024e5360 ret=665130b7 00fd:Ret rsaenh.CPImportKey() retval=00000001 ret=7f515c928426 ... 00fd:Call KERNEL32.CreateFileW(101bb42c L"C:\\ProgramData\\McNeel\\Rhinoceros\\6.0\\License Manager\\Licenses\\55500d41-3a41-4474-99b3-684032a4f4df.lic",ffffffff80000000,00000001,00000000,00000003,00100000,00000000) ret=0a2d47b4 00fd:Ret KERNEL32.CreateFileW() retval=00000308 ret=0a2d47b4 ... 00fd:Call advapi32.CryptContextAddRef(02499d30,00000000,00000000) ret=0c78b52c 00fd:trace:crypt:CryptContextAddRef (0x2499d30, (nil), 00000000) 00fd:Ret advapi32.CryptContextAddRef() retval=00000001 ret=0c78b52c ... 00fd:Call advapi32.CryptDuplicateKey(02499ce0,00000000,00000000,0024a5c8) ret=0c78c54f 00fd:trace:crypt:CryptDuplicateKey (0x2499ce0, (nil), 00000000, 0x24a5c8) 00fd:Call rsaenh.CPDuplicateKey(00000005,00000006,00000000,00000000,024e4910) ret=7f515c926238 00fd:trace:crypt:RSAENH_CPDuplicateKey (hUID=00000005, hKey=00000006, pdwReserved=0000000000000000, dwFlags=00000000, phKey=00000000024E4910) 00fd:Call ntdll.RtlAllocateHeap(00010000,00000000,00000408) ret=665033c4 00fd:Ret ntdll.RtlAllocateHeap() retval=024ca230 ret=665033c4 00fd:Call ntdll.RtlAllocateHeap(00010000,00000000,00000000) ret=6650d79d 00fd:Ret ntdll.RtlAllocateHeap() retval=024e4980 ret=6650d79d 00fd:Call msvcrt.memcpy(024e4980,00000000,00000000) ret=6650d7cf 00fd:Ret msvcrt.memcpy() retval=024e4980 ret=6650d7cf 00fd:Call ntdll.RtlAllocateHeap(00010000,00000000,00000000) ret=6650d7f8 00fd:Ret ntdll.RtlAllocateHeap() retval=0239bca0 ret=6650d7f8 00fd:Call msvcrt.memcpy(0239bca0,00000000,00000000) ret=6650d826 00fd:Ret msvcrt.memcpy() retval=0239bca0 ret=6650d826 00fd:Ret rsaenh.CPDuplicateKey() retval=00000001 ret=7f515c926238 00fd:Ret advapi32.CryptDuplicateKey() retval=00000001 ret=0c78c54f 00fd:Call advapi32.CryptContextAddRef(02499d30,00000000,00000000) ret=0c784f09 00fd:trace:crypt:CryptContextAddRef (0x2499d30, (nil), 00000000) 00fd:Ret advapi32.CryptContextAddRef() retval=00000001 ret=0c784f09 00fd:Call KERNEL32.GetLastError() ret=02b2a82b 00fd:Ret KERNEL32.GetLastError() retval=00000000 ret=02b2a82b ... 00fd:Call advapi32.CryptSetKeyParam(024e4900,00000004,101c2030,00000000) ret=0c78cbf6 00fd:trace:crypt:CryptSetKeyParam (0x24e4900, 4, 0x101c2030, 00000000) 00fd:Call rsaenh.CPSetKeyParam(00000005,00000004,00000004,101c2030,00000000) ret=7f515c928b9d 00fd:trace:crypt:RSAENH_CPSetKeyParam (hProv=00000005, hKey=00000004, dwParam=00000004, pbData=00000000101C2030, dwFlags=00000000) 00fd:Ret rsaenh.CPSetKeyParam() retval=00000001 ret=7f515c928b9d 00fd:Ret advapi32.CryptSetKeyParam() retval=00000001 ret=0c78cbf6 00fd:Call KERNEL32.GetLastError() ret=02b2a82b 00fd:Ret KERNEL32.GetLastError() retval=00000000 ret=02b2a82b 00fd:Call advapi32.CryptSetKeyParam(024e4900,00000001,101c1fe0,00000000) ret=0c78cbf6 00fd:trace:crypt:CryptSetKeyParam (0x24e4900, 1, 0x101c1fe0, 00000000) 00fd:Call rsaenh.CPSetKeyParam(00000005,00000004,00000001,101c1fe0,00000000) ret=7f515c928b9d 00fd:trace:crypt:RSAENH_CPSetKeyParam (hProv=00000005, hKey=00000004, dwParam=00000001, pbData=00000000101C1FE0, dwFlags=00000000) 00fd:Call msvcrt.memcpy(024ca5b0,101c1fe0,00000010) ret=6650db94 00fd:Ret msvcrt.memcpy() retval=024ca5b0 ret=6650db94 00fd:Ret rsaenh.CPSetKeyParam() retval=00000001 ret=7f515c928b9d 00fd:Ret advapi32.CryptSetKeyParam() retval=00000001 ret=0c78cbf6 00fd:Call KERNEL32.GetLastError() ret=02b2a82b 00fd:Ret KERNEL32.GetLastError() retval=00000000 ret=02b2a82b ... 00fd:Call advapi32.CryptDecrypt(024e4900,00000000,00000000,00000000,101c2100,0024a638) ret=0c78de54 00fd:trace:crypt:CryptDecrypt (0x24e4900, 0x0, 0, 00000000, 0x101c2100, 0x24a638) 00fd:Call rsaenh.CPDecrypt(00000005,00000004,00000000,00000000,00000000,101c2100,0024a638) ret=7f515c92594c 00fd:trace:crypt:RSAENH_CPDecrypt (hProv=00000005, hKey=00000004, hHash=00000000, Final=0, dwFlags=00000000, pbData=00000000101C2100, pdwDataLen=000000000024A638) 00fd:Call msvcrt.memcpy(101c2100,0024a240,00000010) ret=66513f82 00fd:Ret msvcrt.memcpy() retval=101c2100 ret=66513f82 00fd:Call msvcrt.memcpy(101c2110,0024a240,00000010) ret=66513f82 00fd:Ret msvcrt.memcpy() retval=101c2110 ret=66513f82 00fd:Call msvcrt.memcpy(101c2120,0024a240,00000010) ret=66513f82 ... 00fd:Call msvcrt.memcpy(101c2820,0024a240,00000010) ret=66513f82 00fd:Ret msvcrt.memcpy() retval=101c2820 ret=66513f82 00fd:Ret rsaenh.CPDecrypt() retval=00000001 ret=7f515c92594c 00fd:Ret advapi32.CryptDecrypt() retval=00000001 ret=0c78de54 ... 00fd:Call advapi32.CryptDecrypt(024e4900,00000000,00000000,00000000,101c2ff0,0024a6f8) ret=0c78de54 00fd:trace:crypt:CryptDecrypt (0x24e4900, 0x0, 0, 00000000, 0x101c2ff0, 0x24a6f8) 00fd:Call rsaenh.CPDecrypt(00000005,00000004,00000000,00000000,00000000,101c2ff0,0024a6f8) ret=7f515c92594c 00fd:trace:crypt:RSAENH_CPDecrypt (hProv=00000005, hKey=00000004, hHash=00000000, Final=0, dwFlags=00000000, pbData=00000000101C2FF0, pdwDataLen=000000000024A6F8) 00fd:Call msvcrt.memcpy(101c2ff0,0024a300,00000010) ret=66513f82 00fd:Ret msvcrt.memcpy() retval=101c2ff0 ret=66513f82 00fd:Ret rsaenh.CPDecrypt() retval=00000001 ret=7f515c92594c 00fd:Ret advapi32.CryptDecrypt() retval=00000001 ret=0c78de54 00fd:Call KERNEL32.GetLastError() ret=02b2a82b ... 00fd:Call advapi32.CryptDecrypt(024e4900,00000000,00000001,00000000,101c3068,0024a680) ret=0c78de54 00fd:trace:crypt:CryptDecrypt (0x24e4900, 0x0, 1, 00000000, 0x101c3068, 0x24a680) 00fd:Call rsaenh.CPDecrypt(00000005,00000004,00000000,00000001,00000000,101c3068,0024a680) ret=7f515c92594c 00fd:trace:crypt:RSAENH_CPDecrypt (hProv=00000005, hKey=00000004, hHash=00000000, Final=1, dwFlags=00000000, pbData=00000000101C3068, pdwDataLen=000000000024A680) 00fd:trace:seh:NtRaiseException code=c0000005 flags=0 addr=0x66513fc9 ip=66513fc9 tid=00fd 00fd:trace:seh:NtRaiseException info[0]=0000000000000000 00fd:trace:seh:NtRaiseException info[1]=00000001101c3067 00fd:trace:seh:NtRaiseException rax=0000000000000000 rbx=0000000000000005 rcx=00000000ffffffff rdx=00000000ffffffff 00fd:trace:seh:NtRaiseException rsi=0000000000000000 rdi=00000000101c3068 rbp=00000000024ca230 rsp=000000000024a1f0 00fd:trace:seh:NtRaiseException r8=0000000073620457 r9=000000000024a268 r10=00000000024ca230 r11=0000000000000000 00fd:trace:seh:NtRaiseException r12=0000000000000000 r13=000000000024a680 r14=0000000000000000 r15=0000000000000001 00fd:trace:seh:call_vectored_handlers calling handler at 0x2c729d8 code=c0000005 flags=0 00fd:Call KERNEL32.GetLastError() ret=02c72a0c 00fd:Ret KERNEL32.GetLastError() retval=00000000 ret=02c72a0c 00fd:trace:seh:call_vectored_handlers handler at 0x2c729d8 returned 0 ... --- snip --- Debugger: --- snip --- ... Wine-dbg>si 0x0000000066513fbe RSAENH_CPDecrypt+0x28e [Z:\home\focht\projects\wine\mainline-src\dlls\rsaenh\rsaenh.c:2696] in rsaenh: leal 0xffffffffffffffff(%rax),%edx 2696 if (pbData[*pdwDataLen-1] && Wine-dbg>si 0x0000000066513fc1 RSAENH_CPDecrypt+0x291 [Z:\home\focht\projects\wine\mainline-src\dlls\rsaenh\rsaenh.c:2696] in rsaenh: movq 0x0000000000000078(%rsp),%r10 2696 if (pbData[*pdwDataLen-1] && Wine-dbg>si 0x0000000066513fc6 RSAENH_CPDecrypt+0x296 [Z:\home\focht\projects\wine\mainline-src\dlls\rsaenh\rsaenh.c:2696] in rsaenh: movq %rdx,%rcx 2696 if (pbData[*pdwDataLen-1] && Wine-dbg>si 0x0000000066513fc9 RSAENH_CPDecrypt+0x299 [Z:\home\focht\projects\wine\mainline-src\dlls\rsaenh\rsaenh.c:2696] in rsaenh: movzbl (%rdi,%rdx,1),%r9d 2696 if (pbData[*pdwDataLen-1] && Wine-dbg>info reg Register dump: rip:0000000066513fc9 rsp:000000000022a2f0 rbp:00000000024c5650 eflags:00000202 ( - -- I - - - ) rax:0000000000000000 rbx:0000000000000005 rcx:00000000ffffffff rdx:00000000ffffffff rsi:0000000000000000 rdi:00000000101cbe58 r8:0000000073620457 r9:000000000022a368 r10:00000000024c5650 r11:0000000066513d30 r12:0000000000000000 r13:000000000022a680 r14:0000000000000000 r15:0000000000000001 --- snip --- https://source.winehq.org/git/wine.git/blob/18fbc3a3cf880f35ab497c0e2026fe85... --- snip --- 2623 BOOL WINAPI RSAENH_CPDecrypt(HCRYPTPROV hProv, HCRYPTKEY hKey, HCRYPTHASH hHash, BOOL Final, 2624 DWORD dwFlags, BYTE *pbData, DWORD *pdwDataLen) 2625 { 2626 CRYPTKEY *pCryptKey; 2627 BYTE *in, out[RSAENH_MAX_BLOCK_SIZE], o[RSAENH_MAX_BLOCK_SIZE]; 2628 DWORD i, j, k; 2629 DWORD dwMax; 2630 2631 TRACE("(hProv=%08lx, hKey=%08lx, hHash=%08lx, Final=%d, dwFlags=%08x, pbData=%p, " 2632 "pdwDataLen=%p)\n", hProv, hKey, hHash, Final, dwFlags, pbData, pdwDataLen); ... 2661 dwMax=*pdwDataLen; 2662 2663 if (GET_ALG_TYPE(pCryptKey->aiAlgid) == ALG_TYPE_BLOCK) { 2664 for (i=0, in=pbData; i<*pdwDataLen; i+=pCryptKey->dwBlockLen, in+=pCryptKey->dwBlockLen) { 2665 switch (pCryptKey->dwMode) { 2666 case CRYPT_MODE_ECB: 2667 encrypt_block_impl(pCryptKey->aiAlgid, 0, &pCryptKey->context, in, out, 2668 RSAENH_DECRYPT); 2669 break; 2670 2671 case CRYPT_MODE_CBC: 2672 encrypt_block_impl(pCryptKey->aiAlgid, 0, &pCryptKey->context, in, out, 2673 RSAENH_DECRYPT); 2674 for (j=0; j<pCryptKey->dwBlockLen; j++) out[j] ^= pCryptKey->abChainVector[j]; 2675 memcpy(pCryptKey->abChainVector, in, pCryptKey->dwBlockLen); 2676 break; 2677 2678 case CRYPT_MODE_CFB: 2679 for (j=0; j<pCryptKey->dwBlockLen; j++) { 2680 encrypt_block_impl(pCryptKey->aiAlgid, 0, &pCryptKey->context, 2681 pCryptKey->abChainVector, o, RSAENH_ENCRYPT); 2682 out[j] = in[j] ^ o[0]; 2683 for (k=0; k<pCryptKey->dwBlockLen-1; k++) 2684 pCryptKey->abChainVector[k] = pCryptKey->abChainVector[k+1]; 2685 pCryptKey->abChainVector[k] = in[j]; 2686 } 2687 break; 2688 2689 default: 2690 SetLastError(NTE_BAD_ALGID); 2691 return FALSE; 2692 } 2693 memcpy(in, out, pCryptKey->dwBlockLen); 2694 } 2695 if (Final) { 2696 if (pbData[*pdwDataLen-1] && 2697 pbData[*pdwDataLen-1] <= pCryptKey->dwBlockLen && 2698 pbData[*pdwDataLen-1] <= *pdwDataLen) { 2699 BOOL padOkay = TRUE; 2700 2701 /* check that every bad byte has the same value */ 2702 for (i = 1; padOkay && i < pbData[*pdwDataLen-1]; i++) 2703 if (pbData[*pdwDataLen - i - 1] != pbData[*pdwDataLen - 1]) 2704 padOkay = FALSE; 2705 if (padOkay) 2706 *pdwDataLen -= pbData[*pdwDataLen-1]; 2707 else { 2708 SetLastError(NTE_BAD_DATA); 2709 setup_key(pCryptKey); 2710 return FALSE; 2711 } 2712 } 2713 else { 2714 SetLastError(NTE_BAD_DATA); 2715 setup_key(pCryptKey); 2716 return FALSE; 2717 } 2718 } ... 2734 2735 if (Final) setup_key(pCryptKey); ... --- some --- Line 2696, the caller which seems some jitted .NET code passed zero *pdwDataLen for whatever reason. Microsoft docs: https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-cryp... --- quote --- ... pbData A pointer to a buffer that contains the data to be decrypted. After the decryption has been performed, the plaintext is placed back into this same buffer. The number of encrypted bytes in this buffer is specified by pdwDataLen. pdwDataLen A pointer to a DWORD value that indicates the length of the pbData buffer. Before calling this function, the calling application sets the DWORD value to the number of bytes to be decrypted. Upon return, the DWORD value contains the number of bytes of the decrypted plaintext. When a block cipher is used, this data length must be a multiple of the block size unless this is the final section of data to be decrypted and the Final parameter is TRUE. --- quote --- I've added a check for zero *pdwDataLen in line 2695 to skip that block and it made the app successfully start. I don't know if this is just undocumented behaviour or an application bug. $ sha1sum rhino_en-us_6.15.19164.21011.exe 85e34606c761ec7229cbe2c6ba7efeae7e778a97 rhino_en-us_6.15.19164.21011.exe $ du -sh rhino_en-us_6.15.19164.21011.exe 263M rhino_en-us_6.15.19164.21011.exe $ wine --version wine-4.12.1 Regards -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=47480 Anastasius Focht <focht(a)gmx.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |dotnet, download URL| |https://web.archive.org/web | |/20190707150806/http://file | |s.mcneel.com/dujour/exe/201 | |90613/rhino_en-us_6.15.1916 | |4.21011.exe -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=47480 Lorenzo Ferrillo <lorenzofer(a)live.it> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |lorenzofer(a)live.it --- Comment #1 from Lorenzo Ferrillo <lorenzofer(a)live.it> --- Project Reality Launcher 5.5.0 is also affected from this bug. (prequisiste winetricks dotnet40) -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=47480 Anastasius Focht <focht(a)gmx.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|Rhinoceros 6 (.NET 4.x app) |Multiple .NET 4.x games and |crashes in rsaenh during |applications crash in |local license file |rsaenh (Rhinoceros 6, |validation |Project Reality Launcher | |5.5.x)(CryptEncrypt / | |CryptDecrypt must support | |state reset) --- Comment #2 from Anastasius Focht <focht(a)gmx.net> --- Hello Lorenzo, --- quote --- Project Reality Launcher 5.5.0 is also affected from this bug. (prequisiste winetricks dotnet40) --- quote --- indeed, refining summary to reflect this. Managed backtrace of 'PRLauncher' process: --- snip --- Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at System.Security.Cryptography.CapiNative.UnsafeNativeMethods.CryptDecrypt(SafeCapiKeyHandle hKey, SafeCapiHashHandle hHash, Boolean Final, Int32 dwFlags, IntPtr pbData, Int32& pdwDataLen) at System.Security.Cryptography.CapiSymmetricAlgorithm.Reset() at System.Security.Cryptography.CapiSymmetricAlgorithm.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.Read(Byte[] buffer, Int32 offset, Int32 count) at System.IO.StreamReader.ReadBuffer() at System.IO.StreamReader.ReadToEnd() --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) ... at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) ... at PRLauncher.WPF.ViewModel.MainWindowViewModel.<.ctor>b__121_18() ... at -.f.c() wine: Unhandled exception 0xe0434352 in thread 2d at address 000000007104F93D (thread 002d), starting debugger... --- snip --- --- snip --- Threads: process tid prio (all id:s are in hex) ... 0000002c (D) C:\Program Files (x86)\Project Reality\Project Reality BF2\mods\pr\bin\PRLauncher.exe 00000042 0 ... 0000002e 0 0000002d 0 <== --- snip -- Corresponding .NET reference source: 'TransformFinalBlock' -> https://github.com/microsoft/referencesource/blob/master/System.Core/System/... which calls 'Reset' method -> https://github.com/microsoft/referencesource/blob/master/System.Core/System/... --- snip --- /// <summary> /// Reset the state of the algorithm so that it can begin processing a new message /// </summary> [SecuritySafeCritical] private void Reset() { Contract.Requires(m_key != null); Contract.Ensures(m_depadBuffer == null); // // CryptEncrypt / CryptDecrypt must be called with the Final parameter set to true so that // their internal state is reset. Since we do all padding by hand, this isn't done by // TransformFinalBlock so is done on an empty buffer here. // byte[] buffer = new byte[OutputBlockSize]; int resetSize = 0; unsafe { fixed (byte* pBuffer = buffer) { if (m_encryptionMode == EncryptionMode.Encrypt) { ... } else { if (!LocalAppContextSwitches.AesCryptoServiceProviderDontCorrectlyResetDecryptor) { resetSize = buffer.Length; } CapiNative.UnsafeNativeMethods.CryptDecrypt(m_key, SafeCapiHashHandle.InvalidHandle, true, 0, new IntPtr(pBuffer), ref resetSize); } } } // Also erase the depadding buffer so we don't cross data from the previous message into this one if (m_depadBuffer != null) { Array.Clear(m_depadBuffer, 0, m_depadBuffer.Length); m_depadBuffer = null; } } --- snip --- The function description highlights the use-case: --- quote --- Reset the state of the algorithm so that it can begin processing a new message --- quote --- Another tidbit from the sources, indicating a workaround: 'LocalAppContextSwitches.AesCryptoServiceProviderDontCorrectlyResetDecryptor' Download: http://files.realitymod.com/downloadassistant/PRBF2-Download-Assistant.exe $ sha1sum prbf2_1.5.0.0_full.iso b097e6cef3fa063a08fddd945ac74b389f864806 prbf2_1.5.0.0_full.iso $ du -sh prbf2_1.5.0.0_full.iso 8.3G prbf2_1.5.0.0_full.iso $ wine --version wine-5.0-rc3 Regards -- Do not reply to this email, post in Bugzilla using the above URL to reply. 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