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431 lines
16 KiB
C++
431 lines
16 KiB
C++
#include "Encrypt.h"
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#include "Objects.h"
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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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// 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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}
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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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void MD5Init (MD5Context *pContext)
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{
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pContext->anBuf[0] = 0x67452301;
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pContext->anBuf[1] = 0xefcdab89;
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pContext->anBuf[2] = 0x98badcfe;
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pContext->anBuf[3] = 0x10325476;
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pContext->anBits[0] = 0;
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pContext->anBits[1] = 0;
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}
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void MD5Update(MD5Context *pContext, const BYTE *pBuf, unsigned int nLen)
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{
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// Update bitcount
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unsigned int nTempBit = pContext->anBits[0];
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if ( ( pContext->anBits[0] = nTempBit + ((unsigned int) nLen << 3) ) < nTempBit )
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pContext->anBits[1]++; // Carry from low to high
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pContext->anBits[1] += nLen >> 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 *) pContext->anIn + nTempBit;
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nTempBit = 64 - nTempBit;
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if ( nLen < nTempBit && pBuf )
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{
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UtilsMemCpy( pTemp, pBuf, nLen);
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return;
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}
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if (pBuf ) UtilsMemCpy( pTemp, pBuf, nTempBit);
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MD5ByteReverse( pContext->anIn, 16);
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MD5Transform( pContext->anBuf, (unsigned int *) pContext->anIn);
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pBuf += nTempBit;
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nLen -= nTempBit;
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}
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// Process data in 64-byte chunks
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while ( nLen >= 64 )
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{
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UtilsMemCpy( pContext->anIn, pBuf, 64);
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MD5ByteReverse( pContext->anIn, 16);
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MD5Transform( pContext->anBuf, (unsigned int *) pContext->anIn);
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pBuf += 64;
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nLen -= 64;
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}
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// Handle any remaining bytes of data.
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UtilsMemCpy( pContext->anIn, pBuf, nLen);
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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 MD5Final (BYTE anDigest[16], MD5Context *pContext)
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{
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// Вычисляем количество байтов по модулю 64
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unsigned int nCount = ( pContext->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 = pContext->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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UtilsMemSet( pTemp, 0, nCount);
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MD5ByteReverse( pContext->anIn, 16);
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MD5Transform( pContext->anBuf, (unsigned int *) pContext->anIn);
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// Now fill the next block with 56 bytes
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UtilsMemSet( pContext->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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UtilsMemSet( pTemp, 0, nCount - 8);
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}
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MD5ByteReverse( pContext->anIn, 14);
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// Append length in bits and transform
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((unsigned int *) pContext->anIn)[14] = pContext->anBits[0];
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((unsigned int *) pContext->anIn)[15] = pContext->anBits[1];
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MD5Transform( pContext->anBuf, (unsigned int *) pContext->anIn);
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MD5ByteReverse( (BYTE *)pContext->anBuf, 4);
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UtilsMemCpy( (BYTE *)anDigest, (BYTE *)pContext->anBuf, 16);
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UtilsMemSet( (BYTE *)pContext, 0, sizeof (pContext)); // In case it's sensitive
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}
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//-------- EncryptRecPtr - Вспомогательные функции ---------------------------------------------
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void ARC4Init (ARC4ContextRec *pContext, const BYTE *pKey, unsigned int nKeyLen)
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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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pContext->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 % nKeyLen];
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for ( unsigned int nIndex = 0; nIndex < ARC4_BUF_SIZE; nIndex++)
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{
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nJ = ( nJ + pContext->anState[nIndex] + pTempArray[nIndex] ) % ARC4_BUF_SIZE;
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BYTE nTemp = pContext->anState[nIndex];
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pContext->anState[nIndex] = pContext->anState[nJ];
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pContext->anState[nJ] = nTemp;
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}
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pContext->nIndex1 = 0;
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pContext->nIndex2 = 0;
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}
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void ARC4CryptBuf (ARC4ContextRec *pContext, const BYTE *pIn, BYTE *pOut, unsigned int nLen )
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{
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for ( unsigned int nIndex = 0; nIndex < nLen; nIndex++)
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{
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pContext->nIndex1 = ( pContext->nIndex1 + 1 ) % 256;
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pContext->nIndex2 = ( pContext->nIndex2 + pContext->anState[ pContext->nIndex1 ] ) % 256;
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BYTE nTemp = pContext->anState[ pContext->nIndex1 ];
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pContext->anState[ pContext->nIndex1 ] = pContext->anState[ pContext->nIndex2 ];
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pContext->anState[ pContext->nIndex2 ] = nTemp;
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unsigned int nTempIndex = ( pContext->anState[ pContext->nIndex1 ] + pContext->anState[ pContext->nIndex2 ] ) % 256;
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BYTE nKoef = pContext->anState[nTempIndex];
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pOut[nIndex] = pIn[nIndex] ^ nKoef;
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}
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}
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//-------- EncryptRecPtr - Основные функции ----------------------------------------------------
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void PadOrTrancatePassword (const char *sPassword, BYTE *pNewPassword)
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{
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unsigned int nLen = UtilsStrLen( sPassword, PASSWD_LEN + 1);
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UtilsMemSet( pNewPassword, 0x00, PASSWD_LEN);
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if ( nLen >= PASSWD_LEN )
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UtilsMemCpy( pNewPassword, (BYTE*)sPassword, PASSWD_LEN);
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else
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{
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if ( nLen > 0 )
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UtilsMemCpy( pNewPassword, (BYTE*)sPassword, nLen);
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UtilsMemCpy( pNewPassword + nLen, c_sPaddingString, PASSWD_LEN - nLen);
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}
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}
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void EncryptInit (EncryptRecPtr pAttr)
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{
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UtilsMemSet( pAttr, 0, sizeof(EncryptRec) );
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pAttr->eMode = EncryptR2;
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pAttr->nKeyLen = 5;
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UtilsMemCpy( pAttr->anOwnerPassword, c_sPaddingString, PASSWD_LEN);
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UtilsMemCpy( pAttr->anUserPassword, c_sPaddingString, PASSWD_LEN);
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pAttr->nPermission = ENABLE_PRINT | ENABLE_EDIT_ALL | ENABLE_COPY | ENABLE_EDIT | PERMISSION_PAD;
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}
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void EncryptCreateUserKey (EncryptRecPtr pAttr)
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{
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ARC4ContextRec oContext;
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// Algorithm 3.4/5 step1
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// Algorithm 3.4 step2
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ARC4Init( &oContext, pAttr->anEncryptionKey, pAttr->nKeyLen);
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ARC4CryptBuf( &oContext, c_sPaddingString, pAttr->anUserKey, PASSWD_LEN);
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if ( EncryptR3 == pAttr->eMode )
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{
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MD5Context oMD5Context;
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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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MD5Init( &oMD5Context);
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MD5Update( &oMD5Context, c_sPaddingString, PASSWD_LEN);
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// Algorithm 3.5 step3
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MD5Update( &oMD5Context, pAttr->anEncryptID, ID_LEN);
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MD5Final( anDigest, &oMD5Context);
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// Algorithm 3.5 step4
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ARC4Init( &oContext, pAttr->anEncryptionKey, pAttr->nKeyLen);
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ARC4CryptBuf( &oContext, 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 < pAttr->nKeyLen; nJ++ )
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pNewKey[nJ] = pAttr->anEncryptionKey[nJ] ^ nI;
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UtilsMemCpy( anDigest, anDigest2, MD5_KEY_LEN);
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ARC4Init( &oContext, pNewKey, pAttr->nKeyLen );
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ARC4CryptBuf( &oContext, 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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UtilsMemSet( pAttr->anUserKey, 0, PASSWD_LEN);
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UtilsMemCpy( pAttr->anUserKey, anDigest2, MD5_KEY_LEN);
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}
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}
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void EncryptCreateOwnerKey (EncryptRecPtr pAttr)
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{
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ARC4ContextRec oARC4Context;
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MD5Context oMD5Context;
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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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MD5Init( &oMD5Context);
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MD5Update( &oMD5Context, pAttr->anOwnerPassword, PASSWD_LEN);
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MD5Final( anDigest, &oMD5Context);
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// Algorithm 3.3 step 3 (Revision 3 only)
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if ( EncryptR3 == pAttr->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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MD5Init( &oMD5Context);
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//MD5Update( &oMD5Context, anDigest, MD5_KEY_LEN);
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MD5Update ( &oMD5Context, anDigest, pAttr->nKeyLen );
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MD5Final( anDigest, &oMD5Context);
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}
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}
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// Algorithm 3.3 step 4
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ARC4Init( &oARC4Context, anDigest, pAttr->nKeyLen );
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// Algorithm 3.3 step 6
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ARC4CryptBuf( &oARC4Context, pAttr->anUserPassword, anTempPassword, PASSWD_LEN);
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// Algorithm 3.3 step 7
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if ( EncryptR3 == pAttr->eMode )
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{
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BYTE anTempPassword2[PASSWD_LEN];
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for (unsigned int i = 1; i <= 19; i++)
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{
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BYTE anNewKey[MD5_KEY_LEN];
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for (unsigned int j = 0; j < pAttr->nKeyLen; j++)
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anNewKey[j] = anDigest[j] ^ i;
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UtilsMemCpy( anTempPassword2, anTempPassword, PASSWD_LEN);
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ARC4Init( &oARC4Context, anNewKey, pAttr->nKeyLen);
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ARC4CryptBuf( &oARC4Context, anTempPassword2, anTempPassword, PASSWD_LEN);
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}
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}
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// Algorithm 3.3 step 8
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UtilsMemCpy( pAttr->anOwnerKey, anTempPassword, PASSWD_LEN);
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}
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void EncryptCreateEncryptionKey (EncryptRecPtr pAttr)
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{
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MD5Context oMD5Context;
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BYTE anTempFlag[4];
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// Algorithm3.2 step2
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MD5Init( &oMD5Context);
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MD5Update( &oMD5Context, pAttr->anUserPassword, PASSWD_LEN);
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// Algorithm3.2 step3
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MD5Update( &oMD5Context, pAttr->anOwnerKey, PASSWD_LEN);
|
|
|
|
|
|
// Algorithm3.2 step4
|
|
anTempFlag[0] = pAttr->nPermission;
|
|
anTempFlag[1] = (pAttr->nPermission >> 8);
|
|
anTempFlag[2] = (pAttr->nPermission >> 16);
|
|
anTempFlag[3] = (pAttr->nPermission >> 24);
|
|
|
|
MD5Update( &oMD5Context, anTempFlag, 4);
|
|
|
|
// Algorithm3.2 step5
|
|
MD5Update(&oMD5Context, pAttr->anEncryptID, ID_LEN);
|
|
MD5Final( pAttr->anEncryptionKey, &oMD5Context);
|
|
|
|
// Algorithm 3.2 step6 (Revision 3 only)
|
|
if ( EncryptR3 == pAttr->eMode )
|
|
{
|
|
for ( unsigned int nIndex = 0; nIndex < 50; nIndex++)
|
|
{
|
|
MD5Init( &oMD5Context);
|
|
MD5Update( &oMD5Context, pAttr->anEncryptionKey, pAttr->nKeyLen);
|
|
MD5Final( pAttr->anEncryptionKey, &oMD5Context);
|
|
}
|
|
}
|
|
}
|
|
void EncryptInitKey (EncryptRecPtr pAttr, unsigned int nObjectId, unsigned short nGenNo )
|
|
{
|
|
MD5Context oContext;
|
|
|
|
pAttr->anEncryptionKey[pAttr->nKeyLen] = nObjectId;
|
|
pAttr->anEncryptionKey[pAttr->nKeyLen + 1] = (nObjectId >> 8);
|
|
pAttr->anEncryptionKey[pAttr->nKeyLen + 2] = (nObjectId >> 16);
|
|
pAttr->anEncryptionKey[pAttr->nKeyLen + 3] = nGenNo;
|
|
pAttr->anEncryptionKey[pAttr->nKeyLen + 4] = (nGenNo >> 8);
|
|
|
|
MD5Init( &oContext);
|
|
MD5Update( &oContext, pAttr->anEncryptionKey, pAttr->nKeyLen + 5);
|
|
MD5Final( pAttr->anMD5EncryptionKey, &oContext);
|
|
|
|
unsigned int nKeyLen = ( pAttr->nKeyLen + 5 > ENCRYPT_KEY_MAX) ? ENCRYPT_KEY_MAX : pAttr->nKeyLen + 5;
|
|
|
|
ARC4Init( &pAttr->oARC4Context, pAttr->anMD5EncryptionKey, nKeyLen );
|
|
}
|
|
|
|
void EncryptReset (EncryptRecPtr pAttr)
|
|
{
|
|
unsigned int nKeyLen = ( pAttr->nKeyLen + 5 > ENCRYPT_KEY_MAX) ? ENCRYPT_KEY_MAX : pAttr->nKeyLen + 5;
|
|
ARC4Init( &pAttr->oARC4Context, pAttr->anMD5EncryptionKey, nKeyLen );
|
|
}
|
|
void EncryptCryptBuf (EncryptRecPtr pAttr, const BYTE *pSrc, BYTE *pDst, unsigned int nLen)
|
|
{
|
|
ARC4CryptBuf( &pAttr->oARC4Context, pSrc, pDst, nLen);
|
|
}
|