MdePkg/Include/Protocol/Rng.h

   1 /** @file
   2   EFI_RNG_PROTOCOL as defined in UEFI 2.4.
   3   The UEFI Random Number Generator Protocol is used to provide random bits for use
   4   in applications, or entropy for seeding other random number generators.
   5
   6 Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #ifndef __EFI_RNG_PROTOCOL_H__
  12 #define __EFI_RNG_PROTOCOL_H__
  13
  14 ///
  15 /// Global ID for the Random Number Generator Protocol
  16 ///
  17 #define EFI_RNG_PROTOCOL_GUID \
  18   { \
  19     0x3152bca5, 0xeade, 0x433d, {0x86, 0x2e, 0xc0, 0x1c, 0xdc, 0x29, 0x1f, 0x44 } \
  20   }
  21
  22 typedef struct _EFI_RNG_PROTOCOL EFI_RNG_PROTOCOL;
  23
  24 ///
  25 /// A selection of EFI_RNG_PROTOCOL algorithms.
  26 /// The algorithms listed are optional, not meant to be exhaustive and be argmented by
  27 /// vendors or other industry standards.
  28 ///
  29
  30 typedef EFI_GUID EFI_RNG_ALGORITHM;
  31
  32 ///
  33 /// The algorithms corresponds to SP800-90 as defined in
  34 /// NIST SP 800-90, "Recommendation for Random Number Generation Using Deterministic Random
  35 /// Bit Generators", March 2007.
  36 ///
  37 #define EFI_RNG_ALGORITHM_SP800_90_HASH_256_GUID \
  38   { \
  39     0xa7af67cb, 0x603b, 0x4d42, {0xba, 0x21, 0x70, 0xbf, 0xb6, 0x29, 0x3f, 0x96 } \
  40   }
  41 #define EFI_RNG_ALGORITHM_SP800_90_HMAC_256_GUID \
  42   { \
  43     0xc5149b43, 0xae85, 0x4f53, {0x99, 0x82, 0xb9, 0x43, 0x35, 0xd3, 0xa9, 0xe7 } \
  44   }
  45 #define EFI_RNG_ALGORITHM_SP800_90_CTR_256_GUID \
  46   { \
  47     0x44f0de6e, 0x4d8c, 0x4045, {0xa8, 0xc7, 0x4d, 0xd1, 0x68, 0x85, 0x6b, 0x9e } \
  48   }
  49 ///
  50 /// The algorithms correspond to X9.31 as defined in
  51 /// NIST, "Recommended Random Number Generator Based on ANSI X9.31 Appendix A.2.4 Using
  52 /// the 3-Key Triple DES and AES Algorithm", January 2005.
  53 ///
  54 #define EFI_RNG_ALGORITHM_X9_31_3DES_GUID \
  55   { \
  56     0x63c4785a, 0xca34, 0x4012, {0xa3, 0xc8, 0x0b, 0x6a, 0x32, 0x4f, 0x55, 0x46 } \
  57   }
  58 #define EFI_RNG_ALGORITHM_X9_31_AES_GUID \
  59   { \
  60     0xacd03321, 0x777e, 0x4d3d, {0xb1, 0xc8, 0x20, 0xcf, 0xd8, 0x88, 0x20, 0xc9 } \
  61   }
  62 ///
  63 /// The "raw" algorithm, when supported, is intended to provide entropy directly from
  64 /// the source, without it going through some deterministic random bit generator.
  65 ///
  66 #define EFI_RNG_ALGORITHM_RAW \
  67   { \
  68     0xe43176d7, 0xb6e8, 0x4827, {0xb7, 0x84, 0x7f, 0xfd, 0xc4, 0xb6, 0x85, 0x61 } \
  69   }
  70
  71 /**
  72   Returns information about the random number generation implementation.
  73
  74   @param[in]     This                 A pointer to the EFI_RNG_PROTOCOL instance.
  75   @param[in,out] RNGAlgorithmListSize On input, the size in bytes of RNGAlgorithmList.
  76                                       On output with a return code of EFI_SUCCESS, the size
  77                                       in bytes of the data returned in RNGAlgorithmList. On output
  78                                       with a return code of EFI_BUFFER_TOO_SMALL,
  79                                       the size of RNGAlgorithmList required to obtain the list.
  80   @param[out] RNGAlgorithmList        A caller-allocated memory buffer filled by the driver
  81                                       with one EFI_RNG_ALGORITHM element for each supported
  82                                       RNG algorithm. The list must not change across multiple
  83                                       calls to the same driver. The first algorithm in the list
  84                                       is the default algorithm for the driver.
  85
  86   @retval EFI_SUCCESS                 The RNG algorithm list was returned successfully.
  87   @retval EFI_UNSUPPORTED             The services is not supported by this driver.
  88   @retval EFI_DEVICE_ERROR            The list of algorithms could not be retrieved due to a
  89                                       hardware or firmware error.
  90   @retval EFI_INVALID_PARAMETER       One or more of the parameters are incorrect.
  91   @retval EFI_BUFFER_TOO_SMALL        The buffer RNGAlgorithmList is too small to hold the result.
  92
  93 **/
  94 typedef
  95 EFI_STATUS
  96 (EFIAPI *EFI_RNG_GET_INFO) (
  97   IN EFI_RNG_PROTOCOL             *This,
  98   IN OUT UINTN                    *RNGAlgorithmListSize,
  99   OUT EFI_RNG_ALGORITHM           *RNGAlgorithmList
 100   );
 101
 102 /**
 103   Produces and returns an RNG value using either the default or specified RNG algorithm.
 104
 105   @param[in]  This                    A pointer to the EFI_RNG_PROTOCOL instance.
 106   @param[in]  RNGAlgorithm            A pointer to the EFI_RNG_ALGORITHM that identifies the RNG
 107                                       algorithm to use. May be NULL in which case the function will
 108                                       use its default RNG algorithm.
 109   @param[in]  RNGValueLength          The length in bytes of the memory buffer pointed to by
 110                                       RNGValue. The driver shall return exactly this numbers of bytes.
 111   @param[out] RNGValue                A caller-allocated memory buffer filled by the driver with the
 112                                       resulting RNG value.
 113
 114   @retval EFI_SUCCESS                 The RNG value was returned successfully.
 115   @retval EFI_UNSUPPORTED             The algorithm specified by RNGAlgorithm is not supported by
 116                                       this driver.
 117   @retval EFI_DEVICE_ERROR            An RNG value could not be retrieved due to a hardware or
 118                                       firmware error.
 119   @retval EFI_NOT_READY               There is not enough random data available to satisfy the length
 120                                       requested by RNGValueLength.
 121   @retval EFI_INVALID_PARAMETER       RNGValue is NULL or RNGValueLength is zero.
 122
 123 **/
 124 typedef
 125 EFI_STATUS
 126 (EFIAPI *EFI_RNG_GET_RNG) (
 127   IN EFI_RNG_PROTOCOL            *This,
 128   IN EFI_RNG_ALGORITHM           *RNGAlgorithm, OPTIONAL
 129   IN UINTN                       RNGValueLength,
 130   OUT UINT8                      *RNGValue
 131   );
 132
 133 ///
 134 /// The Random Number Generator (RNG) protocol provides random bits for use in
 135 /// applications, or entropy for seeding other random number generators.
 136 ///
 137 struct _EFI_RNG_PROTOCOL {
 138   EFI_RNG_GET_INFO                GetInfo;
 139   EFI_RNG_GET_RNG                 GetRNG;
 140 };
 141
 142 extern EFI_GUID gEfiRngProtocolGuid;
 143 extern EFI_GUID gEfiRngAlgorithmSp80090Hash256Guid;
 144 extern EFI_GUID gEfiRngAlgorithmSp80090Hmac256Guid;
 145 extern EFI_GUID gEfiRngAlgorithmSp80090Ctr256Guid;
 146 extern EFI_GUID gEfiRngAlgorithmX9313DesGuid;
 147 extern EFI_GUID gEfiRngAlgorithmX931AesGuid;
 148 extern EFI_GUID gEfiRngAlgorithmRaw;
 149
 150 #endif