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/* $Id: alt-md4.cpp $ */
/** @file
* IPRT - Message-Digest Algorithm 4, Alternative Implementation.
*/
/*
* Copyright (C) 2009-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
/** The MD4 block size in bytes. */
#define RTMD4_BLOCK_SIZE 64
/** The MD4 block size in bits. */
#define RTMD4_BLOCK_SIZE_IN_BITS (RTMD4_BLOCK_SIZE * 8)
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/types.h>
/** Our private context structure. */
typedef struct RTMD4ALTPRIVATECTX
{
uint32_t uA;
uint32_t uB;
uint32_t uC;
uint32_t uD;
/** Message length in bits. */
uint64_t cTotalBits;
/** Input buffer. cTotalBits indicates how much is present. */
union
{
uint8_t abBuffer[RTMD4_BLOCK_SIZE];
uint32_t aX[RTMD4_BLOCK_SIZE / 4];
} u;
} RTMD4ALTPRIVATECTX;
#define RT_MD4_PRIVATE_ALT_CONTEXT
#include <iprt/md4.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/string.h>
AssertCompile(RT_SIZEOFMEMB(RTMD4CONTEXT, abPadding) >= RT_SIZEOFMEMB(RTMD4CONTEXT, AltPrivate));
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** MD4 padding. */
static const uint8_t g_abMd4Padding[RTMD4_BLOCK_SIZE] =
{
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
RTDECL(void) RTMd4Init(PRTMD4CONTEXT pCtx)
{
pCtx->AltPrivate.uA = UINT32_C(0x67452301);
pCtx->AltPrivate.uB = UINT32_C(0xefcdab89);
pCtx->AltPrivate.uC = UINT32_C(0x98badcfe);
pCtx->AltPrivate.uD = UINT32_C(0x10325476);
pCtx->AltPrivate.cTotalBits = 0;
RT_ZERO(pCtx->AltPrivate.u);
}
RT_EXPORT_SYMBOL(RTMd4Init);
DECLINLINE(uint32_t) rtMd4FuncF(uint32_t uX, uint32_t uY, uint32_t uZ)
{
return (uX & uY) | (~uX & uZ);
}
DECLINLINE(uint32_t) rtMd4FuncG(uint32_t uX, uint32_t uY, uint32_t uZ)
{
return (uX & (uY | uZ)) | (uY & uZ);
}
DECLINLINE(uint32_t) rtMd4FuncH(uint32_t uX, uint32_t uY, uint32_t uZ)
{
return uX ^ uY ^ uZ;
}
/**
* Process the current block.
*
* Requires one of the rtMD4BlockInit functions to be called first.
*
* @param pCtx The MD4 context.
*/
DECLINLINE(void) rtMD4BlockProcess(PRTMD4CONTEXT pCtx)
{
#ifdef RT_BIG_ENDIAN
/* Convert the X array to little endian. */
for (uint32_t i = 0; i < RT_ELEMENTS(pCtx->AltPrivate.u.aX); i++)
pCtx->AltPrivate.u.aX[i] = RT_BSWAP_U32(pCtx->AltPrivate.u.aX[i]);
#endif
/* Instead of saving A, B, C, D we copy them into variables and work on those. */
uint32_t A = pCtx->AltPrivate.uA;
uint32_t B = pCtx->AltPrivate.uB;
uint32_t C = pCtx->AltPrivate.uC;
uint32_t D = pCtx->AltPrivate.uD;
/* Round #1: */
#define ABCD_K_S(a,b,c,d, k, s) ASMRotateLeftU32(a + rtMd4FuncF(b, c, d) + pCtx->AltPrivate.u.aX[k], s)
A = ABCD_K_S(A,B,C,D, 0, 3); D = ABCD_K_S(D,A,B,C, 1, 7); C = ABCD_K_S(C,D,A,B, 2, 11); B = ABCD_K_S(B,C,D,A, 3, 19);
A = ABCD_K_S(A,B,C,D, 4, 3); D = ABCD_K_S(D,A,B,C, 5, 7); C = ABCD_K_S(C,D,A,B, 6, 11); B = ABCD_K_S(B,C,D,A, 7, 19);
A = ABCD_K_S(A,B,C,D, 8, 3); D = ABCD_K_S(D,A,B,C, 9, 7); C = ABCD_K_S(C,D,A,B, 10, 11); B = ABCD_K_S(B,C,D,A, 11, 19);
A = ABCD_K_S(A,B,C,D, 12, 3); D = ABCD_K_S(D,A,B,C, 13, 7); C = ABCD_K_S(C,D,A,B, 14, 11); B = ABCD_K_S(B,C,D,A, 15, 19);
#undef ABCD_K_S
/* Round #2: */
#define ABCD_K_S(a,b,c,d, k, s) ASMRotateLeftU32(a + rtMd4FuncG(b, c, d) + pCtx->AltPrivate.u.aX[k] + UINT32_C(0x5a827999), s)
A = ABCD_K_S(A,B,C,D, 0, 3); D = ABCD_K_S(D,A,B,C, 4, 5); C = ABCD_K_S(C,D,A,B, 8, 9); B = ABCD_K_S(B,C,D,A, 12, 13);
A = ABCD_K_S(A,B,C,D, 1, 3); D = ABCD_K_S(D,A,B,C, 5, 5); C = ABCD_K_S(C,D,A,B, 9, 9); B = ABCD_K_S(B,C,D,A, 13, 13);
A = ABCD_K_S(A,B,C,D, 2, 3); D = ABCD_K_S(D,A,B,C, 6, 5); C = ABCD_K_S(C,D,A,B, 10, 9); B = ABCD_K_S(B,C,D,A, 14, 13);
A = ABCD_K_S(A,B,C,D, 3, 3); D = ABCD_K_S(D,A,B,C, 7, 5); C = ABCD_K_S(C,D,A,B, 11, 9); B = ABCD_K_S(B,C,D,A, 15, 13);
#undef ABCD_K_S
/* Round #3: */
#define ABCD_K_S(a,b,c,d, k, s) ASMRotateLeftU32(a + rtMd4FuncH(b, c, d) + pCtx->AltPrivate.u.aX[k] + UINT32_C(0x6ed9eba1), s)
A = ABCD_K_S(A,B,C,D, 0, 3); D = ABCD_K_S(D,A,B,C, 8, 9); C = ABCD_K_S(C,D,A,B, 4, 11); B = ABCD_K_S(B,C,D,A, 12, 15);
A = ABCD_K_S(A,B,C,D, 2, 3); D = ABCD_K_S(D,A,B,C, 10, 9); C = ABCD_K_S(C,D,A,B, 6, 11); B = ABCD_K_S(B,C,D,A, 14, 15);
A = ABCD_K_S(A,B,C,D, 1, 3); D = ABCD_K_S(D,A,B,C, 9, 9); C = ABCD_K_S(C,D,A,B, 5, 11); B = ABCD_K_S(B,C,D,A, 13, 15);
A = ABCD_K_S(A,B,C,D, 3, 3); D = ABCD_K_S(D,A,B,C, 11, 9); C = ABCD_K_S(C,D,A,B, 7, 11); B = ABCD_K_S(B,C,D,A, 15, 15);
#undef ABCD_K_S
/* Perform the additions. */
pCtx->AltPrivate.uA += A;
pCtx->AltPrivate.uB += B;
pCtx->AltPrivate.uC += C;
pCtx->AltPrivate.uD += D;
}
RTDECL(void) RTMd4Update(PRTMD4CONTEXT pCtx, const void *pvBuf, size_t cbBuf)
{
uint8_t const *pbBuf = (uint8_t const *)pvBuf;
/*
* Deal with buffered bytes first.
*/
if (pCtx->AltPrivate.cTotalBits & (RTMD4_BLOCK_SIZE_IN_BITS - 1))
{
uint8_t cbBuffered = (pCtx->AltPrivate.cTotalBits >> 3) & (RTMD4_BLOCK_SIZE - 1);
uint8_t cbMissing = RTMD4_BLOCK_SIZE - cbBuffered;
if (cbBuf >= cbMissing)
{
memcpy(&pCtx->AltPrivate.u.abBuffer[cbBuffered], pbBuf, cbMissing);
pCtx->AltPrivate.cTotalBits += cbMissing << 3;
pbBuf += cbMissing;
cbBuf -= cbMissing;
rtMD4BlockProcess(pCtx);
}
else
{
memcpy(&pCtx->AltPrivate.u.abBuffer[cbBuffered], pbBuf, cbBuf);
pCtx->AltPrivate.cTotalBits += cbBuf << 3;
return;
}
}
/*
* Process full blocks directly from the input buffer.
*/
while (cbBuf >= RTMD4_BLOCK_SIZE)
{
memcpy(&pCtx->AltPrivate.u.abBuffer[0], pbBuf, RTMD4_BLOCK_SIZE);
rtMD4BlockProcess(pCtx);
pbBuf += RTMD4_BLOCK_SIZE;
cbBuf -= RTMD4_BLOCK_SIZE;
pCtx->AltPrivate.cTotalBits += RTMD4_BLOCK_SIZE_IN_BITS;
}
/*
* Stash any remaining bytes into the context buffer.
*/
if (cbBuf > 0)
{
memcpy(&pCtx->AltPrivate.u.abBuffer[0], pbBuf, cbBuf);
pCtx->AltPrivate.cTotalBits += cbBuf << 3;
}
}
RT_EXPORT_SYMBOL(RTMd4Update);
RTDECL(void) RTMd4Final(PRTMD4CONTEXT pCtx, uint8_t pabDigest[RTMD4_HASH_SIZE])
{
uint64_t const cTotalBits = pCtx->AltPrivate.cTotalBits;
/*
* Pad input to block size minus sizeof(cTotalBits).
*/
uint8_t cbMissing = RTMD4_BLOCK_SIZE - ((cTotalBits >> 3) & (RTMD4_BLOCK_SIZE - 1));
uint8_t cbPadding = cbMissing + (cbMissing > 8 ? 0 : RTMD4_BLOCK_SIZE) - 8;
Assert(cbPadding > 0 && cbPadding <= sizeof(g_abMd4Padding));
RTMd4Update(pCtx, g_abMd4Padding, cbPadding);
Assert(((pCtx->AltPrivate.cTotalBits >> 3) & (RTMD4_BLOCK_SIZE - 1)) == RTMD4_BLOCK_SIZE - 8);
/*
* Encode the total bitcount at the end of the buffer and do the final round.
*/
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 8] = (uint8_t)(cTotalBits );
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 7] = (uint8_t)(cTotalBits >> 8);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 6] = (uint8_t)(cTotalBits >> 16);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 5] = (uint8_t)(cTotalBits >> 24);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 4] = (uint8_t)(cTotalBits >> 32);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 3] = (uint8_t)(cTotalBits >> 40);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 2] = (uint8_t)(cTotalBits >> 48);
pCtx->AltPrivate.u.abBuffer[RTMD4_BLOCK_SIZE - 1] = (uint8_t)(cTotalBits >> 56);
rtMD4BlockProcess(pCtx);
/*
* Done. Just encode the digest.
*/
pabDigest[ 0] = (uint8_t)(pCtx->AltPrivate.uA );
pabDigest[ 1] = (uint8_t)(pCtx->AltPrivate.uA >> 8);
pabDigest[ 2] = (uint8_t)(pCtx->AltPrivate.uA >> 16);
pabDigest[ 3] = (uint8_t)(pCtx->AltPrivate.uA >> 24);
pabDigest[ 4] = (uint8_t)(pCtx->AltPrivate.uB );
pabDigest[ 5] = (uint8_t)(pCtx->AltPrivate.uB >> 8);
pabDigest[ 6] = (uint8_t)(pCtx->AltPrivate.uB >> 16);
pabDigest[ 7] = (uint8_t)(pCtx->AltPrivate.uB >> 24);
pabDigest[ 8] = (uint8_t)(pCtx->AltPrivate.uC );
pabDigest[ 9] = (uint8_t)(pCtx->AltPrivate.uC >> 8);
pabDigest[10] = (uint8_t)(pCtx->AltPrivate.uC >> 16);
pabDigest[11] = (uint8_t)(pCtx->AltPrivate.uC >> 24);
pabDigest[12] = (uint8_t)(pCtx->AltPrivate.uD );
pabDigest[13] = (uint8_t)(pCtx->AltPrivate.uD >> 8);
pabDigest[14] = (uint8_t)(pCtx->AltPrivate.uD >> 16);
pabDigest[15] = (uint8_t)(pCtx->AltPrivate.uD >> 24);
/*
* Nuke the state.
*/
RT_ZERO(pCtx->AltPrivate);
}
RT_EXPORT_SYMBOL(RTMd4Final);
RTDECL(void) RTMd4(const void *pvBuf, size_t cbBuf, uint8_t pabDigest[RTMD4_HASH_SIZE])
{
RTMD4CONTEXT Ctx;
RTMd4Init(&Ctx);
RTMd4Update(&Ctx, pvBuf, cbBuf);
RTMd4Final(&Ctx, pabDigest);
}
RT_EXPORT_SYMBOL(RTMd4);
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