t.c

// .net
public static byte[] DecryptBytes(byte[] message)
{
    if (message == null || message.Length == 0)
    {
        return message;
    }
    byte[] result;
    using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
    {
        rijndaelManaged.Key = Encoding.UTF8.GetBytes("OTFjM2I3MzdlMzcxNjBkMmUxYTYxNmYx");
        Debug.Log(rijndaelManaged.Key);
        rijndaelManaged.IV = Convert.FromBase64String("2vYybHoCnSa9SD8Nu6ssAA==");
        Debug.Log(rijndaelManaged.IV);
        rijndaelManaged.Padding = PaddingMode.None;
        Debug.Log(rijndaelManaged.Padding);
        rijndaelManaged.Mode = CipherMode.ECB;
        Debug.Log(rijndaelManaged.Mode);
        using (MemoryStream memoryStream = new MemoryStream())
        {
            using (ICryptoTransform cryptoTransform = rijndaelManaged.CreateDecryptor())
            {
                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write))
                {
                    cryptoStream.Write(message, 0, message.Length);
                    cryptoStream.FlushFinalBlock();
                    result = memoryStream.ToArray();
                }
            }
        }
    }
    return result;
}

// il2cpp converted
// System.Byte[] Spine.Unity.Examples.SpineBeginnerTwo::DecryptBytes(System.Byte[])
extern Il2CppClass* RijndaelManaged_t1034060848_il2cpp_TypeInfo_var;
extern Il2CppClass* Encoding_t663144255_il2cpp_TypeInfo_var;
extern Il2CppClass* Debug_t1368543263_il2cpp_TypeInfo_var;
extern Il2CppClass* Convert_t2607082565_il2cpp_TypeInfo_var;
extern Il2CppClass* PaddingMode_t3032142640_il2cpp_TypeInfo_var;
extern Il2CppClass* CipherMode_t162592484_il2cpp_TypeInfo_var;
extern Il2CppClass* MemoryStream_t743994179_il2cpp_TypeInfo_var;
extern Il2CppClass* CryptoStream_t3531341937_il2cpp_TypeInfo_var;
extern Il2CppClass* IDisposable_t2427283555_il2cpp_TypeInfo_var;
extern Il2CppCodeGenString* _stringLiteral4235975035;
extern Il2CppCodeGenString* _stringLiteral4293549973;
extern const uint32_t SpineBeginnerTwo_DecryptBytes_m16726682_MetadataUsageId;
extern "C"  ByteU5BU5D_t3397334013* SpineBeginnerTwo_DecryptBytes_m16726682 (Il2CppObject * __this /* static, unused */, ByteU5BU5D_t3397334013* ___message0, const MethodInfo* method)
{
	static bool s_Il2CppMethodInitialized;
	if (!s_Il2CppMethodInitialized)
	{
		il2cpp_codegen_initialize_method (SpineBeginnerTwo_DecryptBytes_m16726682_MetadataUsageId);
		s_Il2CppMethodInitialized = true;
	}
	ByteU5BU5D_t3397334013* V_0 = NULL;
	RijndaelManaged_t1034060848 * V_1 = NULL;
	MemoryStream_t743994179 * V_2 = NULL;
	Il2CppObject * V_3 = NULL;
	CryptoStream_t3531341937 * V_4 = NULL;
	Exception_t1927440687 * __last_unhandled_exception = 0;
	NO_UNUSED_WARNING (__last_unhandled_exception);
	Exception_t1927440687 * __exception_local = 0;
	NO_UNUSED_WARNING (__exception_local);
	int32_t __leave_target = 0;
	NO_UNUSED_WARNING (__leave_target);
	{
		ByteU5BU5D_t3397334013* L_0 = ___message0;
		if (!L_0)
		{
			goto IL_000e;
		}
	}
	{
		ByteU5BU5D_t3397334013* L_1 = ___message0;
		if ((((int32_t)((int32_t)(((Il2CppArray *)L_1)->max_length)))))
		{
			goto IL_0010;
		}
	}

IL_000e:
	{
		ByteU5BU5D_t3397334013* L_2 = ___message0;
		return L_2;
	}

IL_0010:
	{
		RijndaelManaged_t1034060848 * L_3 = (RijndaelManaged_t1034060848 *)il2cpp_codegen_object_new(RijndaelManaged_t1034060848_il2cpp_TypeInfo_var);
		RijndaelManaged__ctor_m1723326849(L_3, /*hidden argument*/NULL);
		V_1 = L_3;
	}

IL_0016:
	try
	{ // begin try (depth: 1)
		{
			RijndaelManaged_t1034060848 * L_4 = V_1;
			IL2CPP_RUNTIME_CLASS_INIT(Encoding_t663144255_il2cpp_TypeInfo_var);
			Encoding_t663144255 * L_5 = Encoding_get_UTF8_m1752852937(NULL /*static, unused*/, /*hidden argument*/NULL);
			ByteU5BU5D_t3397334013* L_6 = VirtFuncInvoker1< ByteU5BU5D_t3397334013*, String_t* >::Invoke(10 /* System.Byte[] System.Text.Encoding::GetBytes(System.String) */, L_5, _stringLiteral4235975035);
			VirtActionInvoker1< ByteU5BU5D_t3397334013* >::Invoke(12 /* System.Void System.Security.Cryptography.SymmetricAlgorithm::set_Key(System.Byte[]) */, L_4, L_6);
			RijndaelManaged_t1034060848 * L_7 = V_1;
			ByteU5BU5D_t3397334013* L_8 = VirtFuncInvoker0< ByteU5BU5D_t3397334013* >::Invoke(11 /* System.Byte[] System.Security.Cryptography.SymmetricAlgorithm::get_Key() */, L_7);
			IL2CPP_RUNTIME_CLASS_INIT(Debug_t1368543263_il2cpp_TypeInfo_var);
			Debug_Log_m920475918(NULL /*static, unused*/, (Il2CppObject *)(Il2CppObject *)L_8, /*hidden argument*/NULL);
			RijndaelManaged_t1034060848 * L_9 = V_1;
			IL2CPP_RUNTIME_CLASS_INIT(Convert_t2607082565_il2cpp_TypeInfo_var);
			ByteU5BU5D_t3397334013* L_10 = Convert_FromBase64String_m3629466114(NULL /*static, unused*/, _stringLiteral4293549973, /*hidden argument*/NULL);
			VirtActionInvoker1< ByteU5BU5D_t3397334013* >::Invoke(10 /* System.Void System.Security.Cryptography.SymmetricAlgorithm::set_IV(System.Byte[]) */, L_9, L_10);
			RijndaelManaged_t1034060848 * L_11 = V_1;
			ByteU5BU5D_t3397334013* L_12 = VirtFuncInvoker0< ByteU5BU5D_t3397334013* >::Invoke(9 /* System.Byte[] System.Security.Cryptography.SymmetricAlgorithm::get_IV() */, L_11);
			Debug_Log_m920475918(NULL /*static, unused*/, (Il2CppObject *)(Il2CppObject *)L_12, /*hidden argument*/NULL);
			RijndaelManaged_t1034060848 * L_13 = V_1;
			VirtActionInvoker1< int32_t >::Invoke(19 /* System.Void System.Security.Cryptography.SymmetricAlgorithm::set_Padding(System.Security.Cryptography.PaddingMode) */, L_13, 1);
			RijndaelManaged_t1034060848 * L_14 = V_1;
			int32_t L_15 = VirtFuncInvoker0< int32_t >::Invoke(18 /* System.Security.Cryptography.PaddingMode System.Security.Cryptography.SymmetricAlgorithm::get_Padding() */, L_14);
			int32_t L_16 = L_15;
			Il2CppObject * L_17 = Box(PaddingMode_t3032142640_il2cpp_TypeInfo_var, &L_16);
			Debug_Log_m920475918(NULL /*static, unused*/, L_17, /*hidden argument*/NULL);
			RijndaelManaged_t1034060848 * L_18 = V_1;
			VirtActionInvoker1< int32_t >::Invoke(17 /* System.Void System.Security.Cryptography.SymmetricAlgorithm::set_Mode(System.Security.Cryptography.CipherMode) */, L_18, 2);
			RijndaelManaged_t1034060848 * L_19 = V_1;
			int32_t L_20 = VirtFuncInvoker0< int32_t >::Invoke(16 /* System.Security.Cryptography.CipherMode System.Security.Cryptography.SymmetricAlgorithm::get_Mode() */, L_19);
			int32_t L_21 = L_20;
			Il2CppObject * L_22 = Box(CipherMode_t162592484_il2cpp_TypeInfo_var, &L_21);
			Debug_Log_m920475918(NULL /*static, unused*/, L_22, /*hidden argument*/NULL);
			MemoryStream_t743994179 * L_23 = (MemoryStream_t743994179 *)il2cpp_codegen_object_new(MemoryStream_t743994179_il2cpp_TypeInfo_var);
			MemoryStream__ctor_m1043059966(L_23, /*hidden argument*/NULL);
			V_2 = L_23;
		}

IL_0085:
		try
		{ // begin try (depth: 2)
			{
				RijndaelManaged_t1034060848 * L_24 = V_1;
				Il2CppObject * L_25 = VirtFuncInvoker0< Il2CppObject * >::Invoke(20 /* System.Security.Cryptography.ICryptoTransform System.Security.Cryptography.SymmetricAlgorithm::CreateDecryptor() */, L_24);
				V_3 = L_25;
			}

IL_008c:
			try
			{ // begin try (depth: 3)
				{
					MemoryStream_t743994179 * L_26 = V_2;
					Il2CppObject * L_27 = V_3;
					CryptoStream_t3531341937 * L_28 = (CryptoStream_t3531341937 *)il2cpp_codegen_object_new(CryptoStream_t3531341937_il2cpp_TypeInfo_var);
					CryptoStream__ctor_m2578098817(L_28, L_26, L_27, 1, /*hidden argument*/NULL);
					V_4 = L_28;
				}

IL_0096:
				try
				{ // begin try (depth: 4)
					CryptoStream_t3531341937 * L_29 = V_4;
					ByteU5BU5D_t3397334013* L_30 = ___message0;
					ByteU5BU5D_t3397334013* L_31 = ___message0;
					VirtActionInvoker3< ByteU5BU5D_t3397334013*, int32_t, int32_t >::Invoke(18 /* System.Void System.IO.Stream::Write(System.Byte[],System.Int32,System.Int32) */, L_29, L_30, 0, (((int32_t)((int32_t)(((Il2CppArray *)L_31)->max_length)))));
					CryptoStream_t3531341937 * L_32 = V_4;
					CryptoStream_FlushFinalBlock_m3450379637(L_32, /*hidden argument*/NULL);
					MemoryStream_t743994179 * L_33 = V_2;
					ByteU5BU5D_t3397334013* L_34 = VirtFuncInvoker0< ByteU5BU5D_t3397334013* >::Invoke(25 /* System.Byte[] System.IO.MemoryStream::ToArray() */, L_33);
					V_0 = L_34;
					IL2CPP_LEAVE(0xC4, FINALLY_00b5);
				} // end try (depth: 4)
				catch(Il2CppExceptionWrapper& e)
				{
					__last_unhandled_exception = (Exception_t1927440687 *)e.ex;
					goto FINALLY_00b5;
				}

FINALLY_00b5:
				{ // begin finally (depth: 4)
					{
						CryptoStream_t3531341937 * L_35 = V_4;
						if (!L_35)
						{
							goto IL_00c3;
						}
					}

IL_00bc:
					{
						CryptoStream_t3531341937 * L_36 = V_4;
						InterfaceActionInvoker0::Invoke(0 /* System.Void System.IDisposable::Dispose() */, IDisposable_t2427283555_il2cpp_TypeInfo_var, L_36);
					}

IL_00c3:
					{
						IL2CPP_END_FINALLY(181)
					}
				} // end finally (depth: 4)
				IL2CPP_CLEANUP(181)
				{
					IL2CPP_JUMP_TBL(0xC4, IL_00c4)
					IL2CPP_RETHROW_IF_UNHANDLED(Exception_t1927440687 *)
				}

IL_00c4:
				{
					IL2CPP_LEAVE(0xD6, FINALLY_00c9);
				}
			} // end try (depth: 3)
			catch(Il2CppExceptionWrapper& e)
			{
				__last_unhandled_exception = (Exception_t1927440687 *)e.ex;
				goto FINALLY_00c9;
			}

FINALLY_00c9:
			{ // begin finally (depth: 3)
				{
					Il2CppObject * L_37 = V_3;
					if (!L_37)
					{
						goto IL_00d5;
					}
				}

IL_00cf:
				{
					Il2CppObject * L_38 = V_3;
					InterfaceActionInvoker0::Invoke(0 /* System.Void System.IDisposable::Dispose() */, IDisposable_t2427283555_il2cpp_TypeInfo_var, L_38);
				}

IL_00d5:
				{
					IL2CPP_END_FINALLY(201)
				}
			} // end finally (depth: 3)
			IL2CPP_CLEANUP(201)
			{
				IL2CPP_JUMP_TBL(0xD6, IL_00d6)
				IL2CPP_RETHROW_IF_UNHANDLED(Exception_t1927440687 *)
			}

IL_00d6:
			{
				IL2CPP_LEAVE(0xE8, FINALLY_00db);
			}
		} // end try (depth: 2)
		catch(Il2CppExceptionWrapper& e)
		{
			__last_unhandled_exception = (Exception_t1927440687 *)e.ex;
			goto FINALLY_00db;
		}

FINALLY_00db:
		{ // begin finally (depth: 2)
			{
				MemoryStream_t743994179 * L_39 = V_2;
				if (!L_39)
				{
					goto IL_00e7;
				}
			}

IL_00e1:
			{
				MemoryStream_t743994179 * L_40 = V_2;
				InterfaceActionInvoker0::Invoke(0 /* System.Void System.IDisposable::Dispose() */, IDisposable_t2427283555_il2cpp_TypeInfo_var, L_40);
			}

IL_00e7:
			{
				IL2CPP_END_FINALLY(219)
			}
		} // end finally (depth: 2)
		IL2CPP_CLEANUP(219)
		{
			IL2CPP_JUMP_TBL(0xE8, IL_00e8)
			IL2CPP_RETHROW_IF_UNHANDLED(Exception_t1927440687 *)
		}

IL_00e8:
		{
			IL2CPP_LEAVE(0xFA, FINALLY_00ed);
		}
	} // end try (depth: 1)
	catch(Il2CppExceptionWrapper& e)
	{
		__last_unhandled_exception = (Exception_t1927440687 *)e.ex;
		goto FINALLY_00ed;
	}

FINALLY_00ed:
	{ // begin finally (depth: 1)
		{
			RijndaelManaged_t1034060848 * L_41 = V_1;
			if (!L_41)
			{
				goto IL_00f9;
			}
		}

IL_00f3:
		{
			RijndaelManaged_t1034060848 * L_42 = V_1;
			InterfaceActionInvoker0::Invoke(0 /* System.Void System.IDisposable::Dispose() */, IDisposable_t2427283555_il2cpp_TypeInfo_var, L_42);
		}

IL_00f9:
		{
			IL2CPP_END_FINALLY(237)
		}
	} // end finally (depth: 1)
	IL2CPP_CLEANUP(237)
	{
		IL2CPP_JUMP_TBL(0xFA, IL_00fa)
		IL2CPP_RETHROW_IF_UNHANDLED(Exception_t1927440687 *)
	}

IL_00fa:
	{
		ByteU5BU5D_t3397334013* L_43 = V_0;
		return L_43;
	}
}