/* $Id: alt-md4.cpp $ */ /** @file * IPRT - Message-Digest Algorithm 4, Alternative Implementation. */ /* * Copyright (C) 2009-2019 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /********************************************************************************************************************************* * 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 /** 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 #include #include #include 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);