You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.1 KiB
85 lines
2.1 KiB
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil -*- (for GNU Emacs)
|
|
//
|
|
// Copyright (c) 1985-2000 Microsoft Corporation
|
|
//
|
|
// This file is part of the Microsoft Research IPv6 Network Protocol Stack.
|
|
// You should have received a copy of the Microsoft End-User License Agreement
|
|
// for this software along with this release; see the file "license.txt".
|
|
// If not, please see http://www.research.microsoft.com/msripv6/license.htm,
|
|
// or write to Microsoft Research, One Microsoft Way, Redmond, WA 98052-6399.
|
|
//
|
|
// Abstract:
|
|
//
|
|
// This file contains the support routines for computing MD5 on TCP invariants.
|
|
//
|
|
|
|
#define MD5_SCRATCH_LENGTH 4
|
|
#define MD5_DATA_LENGTH 16
|
|
|
|
//
|
|
// Data structure for MD5 (Message Digest) computation.
|
|
//
|
|
// MD5_CONTEXT
|
|
//
|
|
typedef struct _MD5_CONTEXT {
|
|
ULONG Scratch[MD5_SCRATCH_LENGTH];
|
|
ULONG Data[MD5_DATA_LENGTH];
|
|
} MD5_CONTEXT, *PMD5_CONTEXT;
|
|
|
|
|
|
//
|
|
// The Length of TCP connection invariants should be a multiple of 4.
|
|
//
|
|
C_ASSERT(TCP_MD5_DATA_LENGTH % 4 == 0);
|
|
|
|
|
|
FORCEINLINE
|
|
VOID
|
|
MD5InitializeScratch(
|
|
PMD5_CONTEXT Md5Context
|
|
)
|
|
{
|
|
//
|
|
// Load the constants as suggested by RFC 1321, Appendix A.3.
|
|
//
|
|
|
|
Md5Context->Scratch[0] = (UINT32)0x67452301;
|
|
Md5Context->Scratch[1] = (UINT32)0xefcdab89;
|
|
Md5Context->Scratch[2] = (UINT32)0x98badcfe;
|
|
Md5Context->Scratch[3] = (UINT32)0x10325476;
|
|
}
|
|
|
|
|
|
FORCEINLINE
|
|
VOID
|
|
MD5InitializeData(
|
|
PMD5_CONTEXT Md5Context,
|
|
ULONG RandomValue
|
|
)
|
|
{
|
|
ULONG RandomValueIndex = (TCP_MD5_DATA_LENGTH / 4);
|
|
|
|
//
|
|
// The unused part of the Data buffer should be zero.
|
|
//
|
|
RtlZeroMemory(&Md5Context->Data, sizeof(ULONG) * MD5_DATA_LENGTH);
|
|
|
|
Md5Context->Data[RandomValueIndex] = RandomValue;
|
|
Md5Context->Data[RandomValueIndex + 1] = 0x80;
|
|
|
|
ASSERT((RandomValueIndex + 1) < (MD5_DATA_LENGTH - 2));
|
|
Md5Context->Data[MD5_DATA_LENGTH - 2] =
|
|
(TCP_MD5_DATA_LENGTH + sizeof(ULONG)) * 8;
|
|
|
|
}
|
|
|
|
|
|
//
|
|
// This function will be exported as part of MD5.H; until then,
|
|
// we will define it as extern.
|
|
//
|
|
extern
|
|
VOID
|
|
TransformMD5(ULONG block[4], ULONG buffer[16]);
|
|
|
|
|