CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4.c

   1 /** @file
   2   ARC4 Wrapper Implementation over OpenSSL.
   3
   4 Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "InternalCryptLib.h"
  16 #include <openssl/rc4.h>
  17
  18 /**
  19   Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
  20
  21   @return  The size, in bytes, of the context buffer required for ARC4 operations.
  22
  23 **/
  24 UINTN
  25 EFIAPI
  26 Arc4GetContextSize (
  27   VOID
  28   )
  29 {
  30   //
  31   // Memory for 2 copies of RC4_KEY is allocated, one for working copy, and the other
  32   // for backup copy. When Arc4Reset() is called, we can use the backup copy to restore
  33   // the working copy to the initial state.
  34   //
  35   return (UINTN) (2 * sizeof (RC4_KEY));
  36 }
  37
  38 /**
  39   Initializes user-supplied memory as ARC4 context for subsequent use.
  40
  41   This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
  42   In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
  43   operations.
  44
  45   If Arc4Context is NULL, then return FALSE.
  46   If Key is NULL, then return FALSE.
  47   If KeySize does not in the range of [5, 256] bytes, then return FALSE.
  48
  49   @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
  50   @param[in]   Key          Pointer to the user-supplied ARC4 key.
  51   @param[in]   KeySize      Size of ARC4 key in bytes.
  52
  53   @retval TRUE   ARC4 context initialization succeeded.
  54   @retval FALSE  ARC4 context initialization failed.
  55
  56 **/
  57 BOOLEAN
  58 EFIAPI
  59 Arc4Init (
  60   OUT  VOID         *Arc4Context,
  61   IN   CONST UINT8  *Key,
  62   IN   UINTN        KeySize
  63   )
  64 {
  65   RC4_KEY  *Rc4Key;
  66
  67   //
  68   // Check input parameters.
  69   //
  70   if (Arc4Context == NULL || Key == NULL || (KeySize < 5 || KeySize > 256)) {
  71     return FALSE;
  72   }
  73
  74   Rc4Key = (RC4_KEY *) Arc4Context;
  75
  76   RC4_set_key (Rc4Key, (UINT32) KeySize, Key);
  77
  78   CopyMem (Rc4Key +  1, Rc4Key, sizeof (RC4_KEY));
  79
  80   return TRUE;
  81 }
  82
  83 /**
  84   Performs ARC4 encryption on a data buffer of the specified size.
  85
  86   This function performs ARC4 encryption on data buffer pointed by Input, of specified
  87   size of InputSize.
  88   Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
  89   invalid ARC4 context is undefined.
  90
  91   If Arc4Context is NULL, then return FALSE.
  92   If Input is NULL, then return FALSE.
  93   If Output is NULL, then return FALSE.
  94
  95   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
  96   @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
  97   @param[in]       InputSize    Size of the Input buffer in bytes.
  98   @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
  99
 100   @retval TRUE   ARC4 encryption succeeded.
 101   @retval FALSE  ARC4 encryption failed.
 102
 103 **/
 104 BOOLEAN
 105 EFIAPI
 106 Arc4Encrypt (
 107   IN OUT  VOID         *Arc4Context,
 108   IN      CONST UINT8  *Input,
 109   IN      UINTN        InputSize,
 110   OUT     UINT8        *Output
 111   )
 112 {
 113   RC4_KEY  *Rc4Key;
 114
 115   //
 116   // Check input parameters.
 117   //
 118   if (Arc4Context == NULL || Input == NULL || Output == NULL || InputSize > INT_MAX) {
 119     return FALSE;
 120   }
 121
 122   Rc4Key = (RC4_KEY *) Arc4Context;
 123
 124   RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
 125
 126   return TRUE;
 127 }
 128
 129 /**
 130   Performs ARC4 decryption on a data buffer of the specified size.
 131
 132   This function performs ARC4 decryption on data buffer pointed by Input, of specified
 133   size of InputSize.
 134   Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
 135   invalid ARC4 context is undefined.
 136
 137   If Arc4Context is NULL, then return FALSE.
 138   If Input is NULL, then return FALSE.
 139   If Output is NULL, then return FALSE.
 140
 141   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
 142   @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
 143   @param[in]       InputSize    Size of the Input buffer in bytes.
 144   @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
 145
 146   @retval TRUE   ARC4 decryption succeeded.
 147   @retval FALSE  ARC4 decryption failed.
 148
 149 **/
 150 BOOLEAN
 151 EFIAPI
 152 Arc4Decrypt (
 153   IN OUT  VOID   *Arc4Context,
 154   IN      UINT8  *Input,
 155   IN      UINTN  InputSize,
 156   OUT     UINT8  *Output
 157   )
 158 {
 159   RC4_KEY  *Rc4Key;
 160
 161   //
 162   // Check input parameters.
 163   //
 164   if (Arc4Context == NULL || Input == NULL || Output == NULL || InputSize > INT_MAX) {
 165     return FALSE;
 166   }
 167
 168   Rc4Key = (RC4_KEY *) Arc4Context;
 169
 170   RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
 171
 172   return TRUE;
 173 }
 174
 175 /**
 176   Resets the ARC4 context to the initial state.
 177
 178   The function resets the ARC4 context to the state it had immediately after the
 179   ARC4Init() function call.
 180   Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
 181   should be already correctly initialized by ARC4Init().
 182
 183   If Arc4Context is NULL, then return FALSE.
 184
 185   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
 186
 187   @retval TRUE   ARC4 reset succeeded.
 188   @retval FALSE  ARC4 reset failed.
 189
 190 **/
 191 BOOLEAN
 192 EFIAPI
 193 Arc4Reset (
 194   IN OUT  VOID  *Arc4Context
 195   )
 196 {
 197   RC4_KEY  *Rc4Key;
 198
 199   //
 200   // Check input parameters.
 201   //
 202   if (Arc4Context == NULL) {
 203     return FALSE;
 204   }
 205
 206   Rc4Key = (RC4_KEY *) Arc4Context;
 207
 208   CopyMem (Rc4Key, Rc4Key + 1, sizeof (RC4_KEY));
 209
 210   return TRUE;
 211 }