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