src/Tizen.Security.SecureRepository/Tizen.Security.SecureRepository/Crypto/SafeCipherParametersHandle.cs

   1 /*
   2  *  Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License
  15  */
  16
  17 using System;
  18 using System.Runtime.InteropServices;
  19
  20 namespace Tizen.Security.SecureRepository.Crypto
  21 {
  22     internal class SafeCipherParametersHandle : SafeHandle
  23     {
  24         internal SafeCipherParametersHandle(CipherAlgorithmType algorithm) :
  25             base(IntPtr.Zero, true)
  26         {
  27             IntPtr ptr = IntPtr.Zero;
  28             Interop.CkmcTypes.GenerateNewParam((int)algorithm, out ptr);
  29             this.SetHandle(ptr);
  30         }
  31
  32         internal void SetInteger(CipherParameterName name, long value)
  33         {
  34             Interop.CheckNThrowException(
  35                 Interop.CkmcTypes.ParamListSetInteger(
  36                     Ptr, (int)name, value),
  37                 "Failed to add parameter.");
  38         }
  39
  40         internal void SetBuffer(CipherParameterName name, byte[] value)
  41         {
  42             var rawBuff = new Interop.CkmcRawBuffer(new PinnedObject(value), value.Length);
  43             IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rawBuff));
  44             try
  45             {
  46                 Marshal.StructureToPtr<Interop.CkmcRawBuffer>(rawBuff, ptr, false);
  47                 Interop.CheckNThrowException(
  48                     Interop.CkmcTypes.ParamListSetBuffer(
  49                         Ptr, (int)name, ptr),
  50                     "Failed to add parameter.");
  51             }
  52             finally
  53             {
  54                 Marshal.FreeHGlobal(ptr);
  55             }
  56         }
  57
  58         internal long GetInteger(CipherParameterName name)
  59         {
  60             long value = 0;
  61             Interop.CheckNThrowException(
  62                 Interop.CkmcTypes.ParamListGetInteger(
  63                     Ptr, (int)name, out value),
  64                 "Failed to get parameter.");
  65             return value;
  66         }
  67
  68         internal byte[] GetBuffer(CipherParameterName name)
  69         {
  70             IntPtr ptr = IntPtr.Zero;
  71
  72             try
  73             {
  74                 Interop.CheckNThrowException(
  75                     Interop.CkmcTypes.ParamListGetBuffer(
  76                         Ptr, (int)name, out ptr),
  77                     "Failed to get parameter.");
  78                 return new SafeRawBufferHandle(ptr).Data;
  79             }
  80             finally
  81             {
  82                 if (ptr != IntPtr.Zero)
  83                     Interop.CkmcTypes.BufferFree(ptr);
  84             }
  85         }
  86
  87         internal CipherAlgorithmType Algorithm
  88         {
  89             get
  90             {
  91                 return (CipherAlgorithmType)GetInteger(
  92                     CipherParameterName.AlgorithmType);
  93             }
  94         }
  95
  96         internal IntPtr Ptr
  97         {
  98             get { return this.handle; }
  99         }
 100
 101         public override bool IsInvalid
 102         {
 103             get { return this.handle == IntPtr.Zero; }
 104         }
 105
 106         protected override bool ReleaseHandle()
 107         {
 108             Interop.CkmcTypes.ParamListFree(this.handle);
 109             this.SetHandle(IntPtr.Zero);
 110             return true;
 111         }
 112     }
 113 }