mirror of
https://github.com/ONLYOFFICE/core.git
synced 2026-07-11 06:22:44 +08:00
8a7c86603f
git-svn-id: svn://fileserver/activex/AVS/Sources/TeamlabOffice/trunk/ServerComponents@63069 954022d7-b5bf-4e40-9824-e11837661b57
486 lines
15 KiB
C++
486 lines
15 KiB
C++
#include "Encrypt.h"
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#include "Objects.h"
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// Оптимизационные функции.
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#define OptFunc1(x, y, z) (z ^ (x & (y ^ z)))
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#define OptFunc2(x, y, z) OptFunc1(z, x, y)
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#define OptFunc3(x, y, z) (x ^ y ^ z)
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#define OptFunc4(x, y, z) (y ^ (x | ~z))
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// Основной шаг в алгоритме MD5.
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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namespace PdfWriter
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{
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static const BYTE c_sPaddingString[] =
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{
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0x28, 0xBF, 0x4E, 0x5E, 0x4E, 0x75, 0x8A, 0x41,
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0x64, 0x00, 0x4E, 0x56, 0xFF, 0xFA, 0x01, 0x08,
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0x2E, 0x2E, 0x00, 0xB6, 0xD0, 0x68, 0x3E, 0x80,
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0x2F, 0x0C, 0xA9, 0xFE, 0x64, 0x53, 0x69, 0x7A
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};
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void PadOrTrancatePassword(const char* sPassword, BYTE* pNewPassword)
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{
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unsigned int unLen = StrLen(sPassword, PASSWD_LEN + 1);
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MemSet(pNewPassword, 0x00, PASSWD_LEN);
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if (unLen >= PASSWD_LEN)
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MemCpy(pNewPassword, (BYTE*)sPassword, PASSWD_LEN);
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else
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{
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if (unLen > 0)
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MemCpy(pNewPassword, (BYTE*)sPassword, unLen);
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MemCpy(pNewPassword + unLen, c_sPaddingString, PASSWD_LEN - unLen);
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}
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}
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// The core of the MD5 algorithm, this alters an existing MD5 hash to
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// reflect the addition of 16 longwords of new data. MD5Update blocks
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// the data and converts bytes into longwords for this routine.
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static void MD5ByteReverse(BYTE *pBuf, unsigned int nLongs)
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{
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unsigned int nTemp = 0;
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do
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{
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nTemp = (unsigned int)((unsigned int)pBuf[3] << 8 | pBuf[2]) << 16 | ((unsigned int)pBuf[1] << 8 | pBuf[0]);
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*(unsigned int *)pBuf = nTemp;
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pBuf += 4;
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} while (--nLongs);
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}
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static void MD5Transform(unsigned int anBuf[4], const unsigned int anIn[16])
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{
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register unsigned int a, b, c, d;
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a = anBuf[0];
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b = anBuf[1];
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c = anBuf[2];
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d = anBuf[3];
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MD5STEP(OptFunc1, a, b, c, d, anIn[0] + 0xd76aa478, 7);
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MD5STEP(OptFunc1, d, a, b, c, anIn[1] + 0xe8c7b756, 12);
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MD5STEP(OptFunc1, c, d, a, b, anIn[2] + 0x242070db, 17);
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MD5STEP(OptFunc1, b, c, d, a, anIn[3] + 0xc1bdceee, 22);
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MD5STEP(OptFunc1, a, b, c, d, anIn[4] + 0xf57c0faf, 7);
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MD5STEP(OptFunc1, d, a, b, c, anIn[5] + 0x4787c62a, 12);
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MD5STEP(OptFunc1, c, d, a, b, anIn[6] + 0xa8304613, 17);
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MD5STEP(OptFunc1, b, c, d, a, anIn[7] + 0xfd469501, 22);
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MD5STEP(OptFunc1, a, b, c, d, anIn[8] + 0x698098d8, 7);
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MD5STEP(OptFunc1, d, a, b, c, anIn[9] + 0x8b44f7af, 12);
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MD5STEP(OptFunc1, c, d, a, b, anIn[10] + 0xffff5bb1, 17);
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MD5STEP(OptFunc1, b, c, d, a, anIn[11] + 0x895cd7be, 22);
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MD5STEP(OptFunc1, a, b, c, d, anIn[12] + 0x6b901122, 7);
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MD5STEP(OptFunc1, d, a, b, c, anIn[13] + 0xfd987193, 12);
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MD5STEP(OptFunc1, c, d, a, b, anIn[14] + 0xa679438e, 17);
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MD5STEP(OptFunc1, b, c, d, a, anIn[15] + 0x49b40821, 22);
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MD5STEP(OptFunc2, a, b, c, d, anIn[1] + 0xf61e2562, 5);
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MD5STEP(OptFunc2, d, a, b, c, anIn[6] + 0xc040b340, 9);
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MD5STEP(OptFunc2, c, d, a, b, anIn[11] + 0x265e5a51, 14);
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MD5STEP(OptFunc2, b, c, d, a, anIn[0] + 0xe9b6c7aa, 20);
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MD5STEP(OptFunc2, a, b, c, d, anIn[5] + 0xd62f105d, 5);
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MD5STEP(OptFunc2, d, a, b, c, anIn[10] + 0x02441453, 9);
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MD5STEP(OptFunc2, c, d, a, b, anIn[15] + 0xd8a1e681, 14);
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MD5STEP(OptFunc2, b, c, d, a, anIn[4] + 0xe7d3fbc8, 20);
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MD5STEP(OptFunc2, a, b, c, d, anIn[9] + 0x21e1cde6, 5);
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MD5STEP(OptFunc2, d, a, b, c, anIn[14] + 0xc33707d6, 9);
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MD5STEP(OptFunc2, c, d, a, b, anIn[3] + 0xf4d50d87, 14);
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MD5STEP(OptFunc2, b, c, d, a, anIn[8] + 0x455a14ed, 20);
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MD5STEP(OptFunc2, a, b, c, d, anIn[13] + 0xa9e3e905, 5);
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MD5STEP(OptFunc2, d, a, b, c, anIn[2] + 0xfcefa3f8, 9);
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MD5STEP(OptFunc2, c, d, a, b, anIn[7] + 0x676f02d9, 14);
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MD5STEP(OptFunc2, b, c, d, a, anIn[12] + 0x8d2a4c8a, 20);
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MD5STEP(OptFunc3, a, b, c, d, anIn[5] + 0xfffa3942, 4);
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MD5STEP(OptFunc3, d, a, b, c, anIn[8] + 0x8771f681, 11);
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MD5STEP(OptFunc3, c, d, a, b, anIn[11] + 0x6d9d6122, 16);
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MD5STEP(OptFunc3, b, c, d, a, anIn[14] + 0xfde5380c, 23);
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MD5STEP(OptFunc3, a, b, c, d, anIn[1] + 0xa4beea44, 4);
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MD5STEP(OptFunc3, d, a, b, c, anIn[4] + 0x4bdecfa9, 11);
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MD5STEP(OptFunc3, c, d, a, b, anIn[7] + 0xf6bb4b60, 16);
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MD5STEP(OptFunc3, b, c, d, a, anIn[10] + 0xbebfbc70, 23);
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MD5STEP(OptFunc3, a, b, c, d, anIn[13] + 0x289b7ec6, 4);
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MD5STEP(OptFunc3, d, a, b, c, anIn[0] + 0xeaa127fa, 11);
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MD5STEP(OptFunc3, c, d, a, b, anIn[3] + 0xd4ef3085, 16);
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MD5STEP(OptFunc3, b, c, d, a, anIn[6] + 0x04881d05, 23);
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MD5STEP(OptFunc3, a, b, c, d, anIn[9] + 0xd9d4d039, 4);
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MD5STEP(OptFunc3, d, a, b, c, anIn[12] + 0xe6db99e5, 11);
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MD5STEP(OptFunc3, c, d, a, b, anIn[15] + 0x1fa27cf8, 16);
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MD5STEP(OptFunc3, b, c, d, a, anIn[2] + 0xc4ac5665, 23);
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MD5STEP(OptFunc4, a, b, c, d, anIn[0] + 0xf4292244, 6);
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MD5STEP(OptFunc4, d, a, b, c, anIn[7] + 0x432aff97, 10);
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MD5STEP(OptFunc4, c, d, a, b, anIn[14] + 0xab9423a7, 15);
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MD5STEP(OptFunc4, b, c, d, a, anIn[5] + 0xfc93a039, 21);
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MD5STEP(OptFunc4, a, b, c, d, anIn[12] + 0x655b59c3, 6);
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MD5STEP(OptFunc4, d, a, b, c, anIn[3] + 0x8f0ccc92, 10);
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MD5STEP(OptFunc4, c, d, a, b, anIn[10] + 0xffeff47d, 15);
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MD5STEP(OptFunc4, b, c, d, a, anIn[1] + 0x85845dd1, 21);
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MD5STEP(OptFunc4, a, b, c, d, anIn[8] + 0x6fa87e4f, 6);
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MD5STEP(OptFunc4, d, a, b, c, anIn[15] + 0xfe2ce6e0, 10);
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MD5STEP(OptFunc4, c, d, a, b, anIn[6] + 0xa3014314, 15);
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MD5STEP(OptFunc4, b, c, d, a, anIn[13] + 0x4e0811a1, 21);
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MD5STEP(OptFunc4, a, b, c, d, anIn[4] + 0xf7537e82, 6);
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MD5STEP(OptFunc4, d, a, b, c, anIn[11] + 0xbd3af235, 10);
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MD5STEP(OptFunc4, c, d, a, b, anIn[2] + 0x2ad7d2bb, 15);
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MD5STEP(OptFunc4, b, c, d, a, anIn[9] + 0xeb86d391, 21);
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anBuf[0] += a;
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anBuf[1] += b;
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anBuf[2] += c;
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anBuf[3] += d;
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}
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//----------------------------------------------------------------------------------------
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// CMd5
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//----------------------------------------------------------------------------------------
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CMd5::CMd5()
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{
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Init();
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};
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void CMd5::Init()
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{
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m_anBuf[0] = 0x67452301;
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m_anBuf[1] = 0xefcdab89;
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m_anBuf[2] = 0x98badcfe;
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m_anBuf[3] = 0x10325476;
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m_anBits[0] = 0;
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m_anBits[1] = 0;
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MemSet(m_anIn, 0x00, 64 * sizeof(BYTE));
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}
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void CMd5::Update(const BYTE* pBuffer, unsigned int unLen)
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{
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// Update bitcount
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unsigned int nTempBit = m_anBits[0];
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if ((m_anBits[0] = nTempBit + (unLen << 3)) < nTempBit)
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m_anBits[1]++; // Carry from low to high
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m_anBits[1] += unLen >> 29;
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nTempBit = (nTempBit >> 3) & 0x3f; // Bytes already in shsInfo->data
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// Handle any leading odd-sized chunks
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if (nTempBit)
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{
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BYTE *pTemp = (BYTE *)m_anIn + nTempBit;
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nTempBit = 64 - nTempBit;
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if (unLen < nTempBit && pBuffer)
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{
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MemCpy(pTemp, pBuffer, unLen);
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return;
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}
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if (pBuffer)
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MemCpy(pTemp, pBuffer, nTempBit);
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MD5ByteReverse(m_anIn, 16);
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MD5Transform(m_anBuf, (unsigned int *)m_anIn);
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pBuffer += nTempBit;
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unLen -= nTempBit;
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}
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// Process data in 64-byte chunks
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while (unLen >= 64)
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{
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MemCpy(m_anIn, pBuffer, 64);
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MD5ByteReverse(m_anIn, 16);
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MD5Transform(m_anBuf, (unsigned int *)m_anIn);
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pBuffer += 64;
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unLen -= 64;
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}
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// Handle any remaining bytes of data.
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MemCpy(m_anIn, pBuffer, unLen);
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}
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// Final wrapup - pad to 64-byte boundary with the bit pattern
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// 1 0* (64-bit count of bits processed, MSB-first)
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void CMd5::Final(BYTE anDigest[16])
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{
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// Вычисляем количество байтов по модулю 64
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unsigned int nCount = (m_anBits[0] >> 3) & 0x3F;
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// Устанавливаем первый символ в дополнительной строке(padding) значением 0x80.
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// Это безопасно, поскольку всегда как минимум один байт свободен.
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BYTE *pTemp = m_anIn + nCount;
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*pTemp++ = 0x80;
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// Bytes of padding needed to make 64 bytes
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nCount = 64 - 1 - nCount;
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// Pad out to 56 mod 64
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if (nCount < 8)
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{
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// Two lots of padding: Pad the first block to 64 bytes
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MemSet(pTemp, 0, nCount);
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MD5ByteReverse(m_anIn, 16);
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MD5Transform(m_anBuf, (unsigned int *)m_anIn);
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// Now fill the next block with 56 bytes
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MemSet(m_anIn, 0, 56);
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}
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else
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{
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// Pad block to 56 bytes
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MemSet(pTemp, 0, nCount - 8);
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}
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MD5ByteReverse(m_anIn, 14);
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// Append length in bits and transform
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((unsigned int *)m_anIn)[14] = m_anBits[0];
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((unsigned int *)m_anIn)[15] = m_anBits[1];
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MD5Transform(m_anBuf, (unsigned int *)m_anIn);
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MD5ByteReverse((BYTE *)m_anBuf, 4);
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MemCpy((BYTE *)anDigest, (BYTE *)m_anBuf, 16);
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Clear(); // In case it's sensitive
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}
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void CMd5::Clear()
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{
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MemSet(m_anBits, 0, 2 * sizeof(unsigned int));
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MemSet(m_anBuf, 0, 4 * sizeof(unsigned int));
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MemSet(m_anIn, 0x00, 64 * sizeof(BYTE));
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}
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//----------------------------------------------------------------------------------------
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// CArc4
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//----------------------------------------------------------------------------------------
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void CArc4::Init(const BYTE* pKey, unsigned int unKeyLen)
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{
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BYTE pTempArray[ARC4_BUF_SIZE];
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unsigned int nJ = 0;
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for (unsigned int nIndex = 0; nIndex < ARC4_BUF_SIZE; nIndex++)
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m_anState[nIndex] = nIndex;
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for (unsigned int nIndex = 0; nIndex < ARC4_BUF_SIZE; nIndex++)
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pTempArray[nIndex] = pKey[nIndex % unKeyLen];
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for (unsigned int nIndex = 0; nIndex < ARC4_BUF_SIZE; nIndex++)
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{
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nJ = (nJ + m_anState[nIndex] + pTempArray[nIndex]) % ARC4_BUF_SIZE;
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BYTE nTemp = m_anState[nIndex];
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m_anState[nIndex] = m_anState[nJ];
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m_anState[nJ] = nTemp;
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}
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m_nIndex1 = 0;
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m_nIndex2 = 0;
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}
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void CArc4::CryptBuf(const BYTE* pIn, BYTE* pOut, unsigned int unLen)
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{
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for (unsigned int nIndex = 0; nIndex < unLen; nIndex++)
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{
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m_nIndex1 = (m_nIndex1 + 1) % 256;
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m_nIndex2 = (m_nIndex2 + m_anState[m_nIndex1]) % 256;
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BYTE nTemp = m_anState[m_nIndex1];
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m_anState[m_nIndex1] = m_anState[m_nIndex2];
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m_anState[m_nIndex2] = nTemp;
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unsigned int nTempIndex = (m_anState[m_nIndex1] + m_anState[m_nIndex2]) % 256;
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BYTE nKoef = m_anState[nTempIndex];
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pOut[nIndex] = pIn[nIndex] ^ nKoef;
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}
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}
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//----------------------------------------------------------------------------------------
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// CEncrypt
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//----------------------------------------------------------------------------------------
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CEncrypt::CEncrypt()
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{
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Init();
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}
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void CEncrypt::Init()
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{
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m_eMode = encryptmode_R2;
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m_unKeyLen = 5;
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MemCpy(m_anOwnerPassword, c_sPaddingString, PASSWD_LEN);
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MemCpy(m_anUserPassword, c_sPaddingString, PASSWD_LEN);
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m_unPermission = ENABLE_PRINT | ENABLE_EDIT_ALL | ENABLE_COPY | ENABLE_EDIT | PERMISSION_PAD;
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MemSet(m_anOwnerKey, 0, PASSWD_LEN);
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MemSet(m_anUserKey, 0, PASSWD_LEN);
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MemSet(m_anEncryptID, 0, ID_LEN);
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MemSet(m_anEncryptionKey, 0, MD5_KEY_LEN + 5);
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MemSet(m_anMD5EncryptionKey, 0, MD5_KEY_LEN);
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}
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void CEncrypt::CreateUserKey()
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{
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CArc4 oContext;
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// Algorithm 3.4/5 step1
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// Algorithm 3.4 step2
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oContext.Init(m_anEncryptionKey, m_unKeyLen);
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oContext.CryptBuf(c_sPaddingString, m_anUserKey, PASSWD_LEN);
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if (encryptmode_R3 == m_eMode)
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{
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CMd5 oMmd5;
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BYTE anDigest[MD5_KEY_LEN];
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BYTE anDigest2[MD5_KEY_LEN];
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// Algorithm 3.5 step2 (same as Algorithm3.2 step2)
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oMmd5.Init();
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oMmd5.Update(c_sPaddingString, PASSWD_LEN);
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// Algorithm 3.5 step3
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oMmd5.Update(m_anEncryptID, ID_LEN);
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oMmd5.Final(anDigest);
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// Algorithm 3.5 step4
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oContext.Init(m_anEncryptionKey, m_unKeyLen);
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oContext.CryptBuf(anDigest, anDigest2, MD5_KEY_LEN);
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// Algorithm 3.5 step5
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for (unsigned int nI = 1; nI <= 19; nI++)
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{
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BYTE pNewKey[MD5_KEY_LEN];
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for (unsigned int nJ = 0; nJ < m_unKeyLen; nJ++)
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pNewKey[nJ] = m_anEncryptionKey[nJ] ^ nI;
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MemCpy(anDigest, anDigest2, MD5_KEY_LEN);
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oContext.Init(pNewKey, m_unKeyLen);
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oContext.CryptBuf(anDigest, anDigest2, MD5_KEY_LEN);
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}
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// use the result of Algorithm 3.4 as 'arbitrary padding'
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MemSet(m_anUserKey, 0, PASSWD_LEN);
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MemCpy(m_anUserKey, anDigest2, MD5_KEY_LEN);
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}
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}
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void CEncrypt::CreateOwnerKey()
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{
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CArc4 oArc4;
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CMd5 oMd5;
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BYTE anDigest[MD5_KEY_LEN];
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BYTE anTempPassword[PASSWD_LEN];
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// create md5-digest using the value of anOwnerPassword
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// Algorithm 3.3 step 2
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oMd5.Init();
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oMd5.Update(m_anOwnerPassword, PASSWD_LEN);
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oMd5.Final(anDigest);
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// Algorithm 3.3 step 3 (Revision 3 only)
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if (encryptmode_R3 == m_eMode)
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{
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for (unsigned int nIndex = 0; nIndex < 50; nIndex++)
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{
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oMd5.Init();
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oMd5.Update(anDigest, m_unKeyLen);
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oMd5.Final(anDigest);
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}
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}
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// Algorithm 3.3 step 4
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oArc4.Init(anDigest, m_unKeyLen);
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// Algorithm 3.3 step 6
|
|
oArc4.CryptBuf(m_anUserPassword, anTempPassword, PASSWD_LEN);
|
|
|
|
// Algorithm 3.3 step 7
|
|
if (encryptmode_R3 == m_eMode)
|
|
{
|
|
BYTE anTempPassword2[PASSWD_LEN];
|
|
|
|
for (unsigned int i = 1; i <= 19; i++)
|
|
{
|
|
BYTE anNewKey[MD5_KEY_LEN];
|
|
|
|
for (unsigned int j = 0; j < m_unKeyLen; j++)
|
|
anNewKey[j] = anDigest[j] ^ i;
|
|
|
|
MemCpy(anTempPassword2, anTempPassword, PASSWD_LEN);
|
|
oArc4.Init(anNewKey, m_unKeyLen);
|
|
oArc4.CryptBuf(anTempPassword2, anTempPassword, PASSWD_LEN);
|
|
}
|
|
}
|
|
|
|
// Algorithm 3.3 step 8
|
|
MemCpy(m_anOwnerKey, anTempPassword, PASSWD_LEN);
|
|
}
|
|
void CEncrypt::CreateEncryptionKey()
|
|
{
|
|
CMd5 oMd5;
|
|
BYTE anTempFlag[4];
|
|
|
|
// Algorithm3.2 step2
|
|
oMd5.Init();
|
|
oMd5.Update(m_anUserPassword, PASSWD_LEN);
|
|
|
|
// Algorithm3.2 step3
|
|
oMd5.Update(m_anOwnerKey, PASSWD_LEN);
|
|
|
|
|
|
// Algorithm3.2 step4
|
|
anTempFlag[0] = m_unPermission;
|
|
anTempFlag[1] = (m_unPermission >> 8);
|
|
anTempFlag[2] = (m_unPermission >> 16);
|
|
anTempFlag[3] = (m_unPermission >> 24);
|
|
|
|
oMd5.Update(anTempFlag, 4);
|
|
|
|
// Algorithm3.2 step5
|
|
oMd5.Update(m_anEncryptID, ID_LEN);
|
|
oMd5.Final(m_anEncryptionKey);
|
|
|
|
// Algorithm 3.2 step6 (Revision 3 only)
|
|
if (encryptmode_R3 == m_eMode)
|
|
{
|
|
for (unsigned int nIndex = 0; nIndex < 50; nIndex++)
|
|
{
|
|
oMd5.Init();
|
|
oMd5.Update(m_anEncryptionKey, m_unKeyLen);
|
|
oMd5.Final(m_anEncryptionKey);
|
|
}
|
|
}
|
|
}
|
|
void CEncrypt::InitKey(unsigned int unObjectId, unsigned short unGenNo)
|
|
{
|
|
m_anEncryptionKey[m_unKeyLen + 0] = (BYTE) unObjectId;
|
|
m_anEncryptionKey[m_unKeyLen + 1] = (BYTE)(unObjectId >> 8);
|
|
m_anEncryptionKey[m_unKeyLen + 2] = (BYTE)(unObjectId >> 16);
|
|
m_anEncryptionKey[m_unKeyLen + 3] = (BYTE) unGenNo;
|
|
m_anEncryptionKey[m_unKeyLen + 4] = (BYTE)(unGenNo >> 8);
|
|
|
|
CMd5 oMd5;
|
|
oMd5.Init();
|
|
oMd5.Update(m_anEncryptionKey, m_unKeyLen + 5);
|
|
oMd5.Final(m_anMD5EncryptionKey);
|
|
|
|
unsigned int unKeyLen = (m_unKeyLen + 5 > ENCRYPT_KEY_MAX) ? ENCRYPT_KEY_MAX : m_unKeyLen + 5;
|
|
m_oArc4Context.Init(m_anMD5EncryptionKey, unKeyLen);
|
|
}
|
|
void CEncrypt::Reset()
|
|
{
|
|
unsigned int unKeyLen = (m_unKeyLen + 5 > ENCRYPT_KEY_MAX) ? ENCRYPT_KEY_MAX : m_unKeyLen + 5;
|
|
m_oArc4Context.Init(m_anMD5EncryptionKey, unKeyLen);
|
|
}
|
|
void CEncrypt::CryptBuf(const BYTE* pSrc, BYTE* pDst, unsigned int unLen)
|
|
{
|
|
m_oArc4Context.CryptBuf(pSrc, pDst, unLen);
|
|
}
|
|
void CEncrypt::SetPermission(unsigned int unPermission)
|
|
{
|
|
m_unPermission = unPermission;
|
|
}
|
|
void CEncrypt::SetMode(EEncryptMode eMode, unsigned int unKeyLen)
|
|
{
|
|
if (encryptmode_R2 == eMode)
|
|
m_unKeyLen = 5;
|
|
else
|
|
{
|
|
if (unKeyLen >= 5 && unKeyLen <= 16)
|
|
m_unKeyLen = unKeyLen;
|
|
else
|
|
m_unKeyLen = 16;
|
|
}
|
|
|
|
m_eMode = eMode;
|
|
}
|
|
} |