md5.cpp

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/* md5.cpp                                
 *
 * Copyright (C) 2003 Sawtooth Consulting Ltd.
 *
 * This file is part of yaSSL.
 *
 * yaSSL 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * yaSSL 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */


/* based on Wei Dai's md5.cpp from CryptoPP */

#include "runtime.hpp"
#include "md5.hpp"
#include "algorithm.hpp"    // mySTL::swap

   
#if defined(TAOCRYPT_X86ASM_AVAILABLE) && defined(TAO_ASM)
    #define DO_MD5_ASM
#endif

namespace TaoCrypt {

void MD5::Init()
{
    digest_[0] = 0x67452301L;
    digest_[1] = 0xefcdab89L;
    digest_[2] = 0x98badcfeL;
    digest_[3] = 0x10325476L;

    buffLen_ = 0;
    loLen_  = 0;
    hiLen_  = 0;
}


MD5::MD5(const MD5& that) : HASHwithTransform(DIGEST_SIZE / sizeof(word32),
                                              BLOCK_SIZE) 
{ 
    buffLen_ = that.buffLen_;
    loLen_  =  that.loLen_;
    hiLen_  =  that.hiLen_;

    memcpy(digest_, that.digest_, DIGEST_SIZE);
    memcpy(buffer_, that.buffer_, BLOCK_SIZE);
}

MD5& MD5::operator= (const MD5& that)
{
    MD5 tmp(that);
    Swap(tmp);

    return *this;
}


void MD5::Swap(MD5& other)
{
    mySTL::swap(loLen_,   other.loLen_);
    mySTL::swap(hiLen_,   other.hiLen_);
    mySTL::swap(buffLen_, other.buffLen_);

    memcpy(digest_, other.digest_, DIGEST_SIZE);
    memcpy(buffer_, other.buffer_, BLOCK_SIZE);
}


// Update digest with data of size len, do in blocks
void MD5::Update(const byte* data, word32 len)
{
    byte* local = (byte*)buffer_;

    // remove buffered data if possible
    if (buffLen_)  {   
        word32 add = min(len, BLOCK_SIZE - buffLen_);
        memcpy(&local[buffLen_], data, add);

        buffLen_ += add;
        data     += add;
        len      -= add;

        if (buffLen_ == BLOCK_SIZE) {
            ByteReverseIf(local, local, BLOCK_SIZE, LittleEndianOrder);
            Transform();
            AddLength(BLOCK_SIZE);
            buffLen_ = 0;
        }
    }

    // do block size transforms or all at once for asm
    if (buffLen_ == 0) {
        #ifndef DO_MD5_ASM
            while (len >= BLOCK_SIZE) {
                memcpy(&local[0], data, BLOCK_SIZE);

                data     += BLOCK_SIZE;
                len      -= BLOCK_SIZE;

                ByteReverseIf(local, local, BLOCK_SIZE, LittleEndianOrder);
                Transform();
                AddLength(BLOCK_SIZE);
            }
        #else
            word32 times = len / BLOCK_SIZE;
            if (times) {
                AsmTransform(data, times);
                const word32 add = BLOCK_SIZE * times;
                AddLength(add);
                len  -= add;
                data += add;
            }
        #endif
    }

    // cache any data left
    if (len) {
        memcpy(&local[buffLen_], data, len);
        buffLen_ += len;
    }
}


#ifdef DO_MD5_ASM


/*
    // w = rotlFixed(w + f(x, y, z) + index[edi] + data, s) + x
#define ASMMD5STEP(f, w, x, y, z, index, data, s)       \
    f(x, y, z)                                          \
    AS2(    mov   ebp, [edi + index * 4]            )   \
    AS2(    lea     w, [esi + w + data]             )   \
    AS2(    add     w, ebp                          )   \
    AS2(    rol     w, s                            )   \
    AS2(    add     w, x                            )


    // F1(x, y, z) (z ^ (x & (y ^ z)))
    // place in esi
#define ASMF1(x, y, z) \
    AS2(    mov   esi, y                )   \
    AS2(    xor   esi, z                )   \
    AS2(    and   esi, x                )   \
    AS2(    xor   esi, z                )


#define ASMF2(x, y, z) ASMF1(z, x, y)


    // F3(x ^ y ^ z)
    // place in esi
#define ASMF3(x, y, z)  \
    AS2(    mov   esi, x                )   \
    AS2(    xor   esi, y                )   \
    AS2(    xor   esi, z                )



    // F4(x, y, z) (y ^ (x | ~z))
    // place in esi
#define ASMF4(x, y, z)  \
    AS2(    mov   esi, z                )   \
    AS1(    not   esi                   )   \
    AS2(     or   esi, x                )   \
    AS2(    xor   esi, y                )
*/


    // combine above ASMMD5STEP(f w/ each f ASMF1 - F4

    // esi already set up, after using set for next round
    // ebp already set up, set up using next round index
    
#define MD5STEP1(w, x, y, z, index, data, s)    \
    AS2(    xor   esi, z                    )   \
    AS2(    and   esi, x                    )   \
    AS2(    lea     w, [ebp + w + data]     )   \
    AS2(    xor   esi, z                    )   \
    AS2(    add     w, esi                  )   \
    AS2(    mov   esi, x                    )   \
    AS2(    rol     w, s                    )   \
    AS2(    mov   ebp, [edi + index * 4]    )   \
    AS2(    add     w, x                    )

#define MD5STEP2(w, x, y, z, index, data, s)    \
    AS2(    xor   esi, x                    )   \
    AS2(    and   esi, z                    )   \
    AS2(    lea     w, [ebp + w + data]     )   \
    AS2(    xor   esi, y                    )   \
    AS2(    add     w, esi                  )   \
    AS2(    mov   esi, x                    )   \
    AS2(    rol     w, s                    )   \
    AS2(    mov   ebp, [edi + index * 4]    )   \
    AS2(    add     w, x                    )


#define MD5STEP3(w, x, y, z, index, data, s)    \
    AS2(    xor   esi, z                    )   \
    AS2(    lea     w, [ebp + w + data]     )   \
    AS2(    xor   esi, x                    )   \
    AS2(    add     w, esi                  )   \
    AS2(    mov   esi, x                    )   \
    AS2(    rol     w, s                    )   \
    AS2(    mov   ebp, [edi + index * 4]    )   \
    AS2(    add     w, x                    )


#define MD5STEP4(w, x, y, z, index, data, s)    \
    AS2(     or   esi, x                    )   \
    AS2(    lea     w, [ebp + w + data]     )   \
    AS2(    xor   esi, y                    )   \
    AS2(    add     w, esi                  )   \
    AS2(    mov   esi, y                    )   \
    AS2(    rol     w, s                    )   \
    AS1(    not   esi                       )   \
    AS2(    mov   ebp, [edi + index * 4]    )   \
    AS2(    add     w, x                    )



#ifdef _MSC_VER
    __declspec(naked) 
#endif
void MD5::AsmTransform(const byte* data, word32 times)
{
#ifdef __GNUC__
    #define AS1(x)    asm(#x);
    #define AS2(x, y) asm(#x ", " #y);

    #define PROLOG()  \
        asm(".intel_syntax noprefix"); \
        AS2(    movd  mm3, edi                      )   \
        AS2(    movd  mm4, ebx                      )   \
        AS2(    movd  mm5, esi                      )   \
        AS2(    movd  mm6, ebp                      )   \
        AS2(    mov   ecx, DWORD PTR [ebp +  8]     )   \
        AS2(    mov   edi, DWORD PTR [ebp + 12]     )   \
        AS2(    mov   eax, DWORD PTR [ebp + 16]     )

    #define EPILOG()  \
        AS2(    movd  ebp, mm6                  )   \
        AS2(    movd  esi, mm5                  )   \