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308 lines
10 KiB
C++
308 lines
10 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//===========================================================================//
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#include "basetypes.h"
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#include "commonmacros.h"
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#include "checksum_md5.h"
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#include <string.h>
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#include <stdio.h>
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#include "tier1/strtools.h"
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#include "tier0/dbg.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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// The four core functions - F1 is optimized somewhat
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// #define F1(x, y, z) (x & y | ~x & z)
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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// This is the central step in the MD5 algorithm.
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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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//-----------------------------------------------------------------------------
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// Purpose: 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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// Input : buf[4] -
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// in[16] -
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// Output : static void
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//-----------------------------------------------------------------------------
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static void MD5Transform(unsigned int buf[4], unsigned int const in[16])
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{
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register unsigned int a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Start MD5 accumulation. Set bit count to 0 and buffer to mysterious initialization constants.
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// Input : *ctx -
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//-----------------------------------------------------------------------------
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void MD5Init(MD5Context_t *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Update context to reflect the concatenation of another buffer full of bytes.
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// Input : *ctx -
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// *buf -
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// len -
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//-----------------------------------------------------------------------------
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void MD5Update(MD5Context_t *ctx, unsigned char const *buf, unsigned int len)
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{
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unsigned int t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((unsigned int) len << 3)) < t)
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ctx->bits[1]++; /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if (t)
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{
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unsigned char *p = (unsigned char *) ctx->in + t;
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t = 64 - t;
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if (len < t)
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{
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memcpy(p, buf, len);
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return;
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}
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memcpy(p, buf, t);
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//byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (unsigned int *) ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64)
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{
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memcpy(ctx->in, buf, 64);
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//byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (unsigned int *) ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy(ctx->in, buf, len);
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}
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//-----------------------------------------------------------------------------
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// Purpose: 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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// Input : digest[MD5_DIGEST_LENGTH] -
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// *ctx -
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//-----------------------------------------------------------------------------
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void MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5Context_t *ctx)
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{
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unsigned count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 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(p, 0, count);
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//byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (unsigned int *) ctx->in);
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/* Now fill the next block with 56 bytes */
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memset(ctx->in, 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(p, 0, count - 8);
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}
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//byteReverse(ctx->in, 14);
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/* Append length in bits and transform */
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((unsigned int *) ctx->in)[14] = ctx->bits[0];
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((unsigned int *) ctx->in)[15] = ctx->bits[1];
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MD5Transform(ctx->buf, (unsigned int *) ctx->in);
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//byteReverse((unsigned char *) ctx->buf, 4);
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memcpy(digest, ctx->buf, MD5_DIGEST_LENGTH);
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memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : *hash -
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// hashlen -
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// Output : char
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//-----------------------------------------------------------------------------
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char *MD5_Print( unsigned char *hash, int hashlen )
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{
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static char szReturn[64];
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Assert( hashlen <= 32 );
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Q_binarytohex( hash, hashlen, szReturn, sizeof( szReturn ) );
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return szReturn;
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}
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//-----------------------------------------------------------------------------
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// Purpose: generate pseudo random number from a seed number
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// Input : seed number
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// Output : pseudo random number
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//-----------------------------------------------------------------------------
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unsigned int MD5_PseudoRandom(unsigned int nSeed)
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{
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MD5Context_t ctx;
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unsigned char digest[MD5_DIGEST_LENGTH]; // The MD5 Hash
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memset( &ctx, 0, sizeof( ctx ) );
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MD5Init(&ctx);
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MD5Update(&ctx, (unsigned char*)&nSeed, sizeof(nSeed) );
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MD5Final(digest, &ctx);
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unsigned int rand;
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memcpy(&rand, digest+6, sizeof(rand)); // use 4 middle bytes for random value
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return rand;
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}
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//-----------------------------------------------------------------------------
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bool MD5_Compare( const MD5Value_t &data, const MD5Value_t &compare )
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{
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return V_memcmp( data.bits, compare.bits, MD5_DIGEST_LENGTH ) == 0;
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}
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//-----------------------------------------------------------------------------
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void MD5Value_t::Zero()
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{
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V_memset( bits, 0, sizeof( bits ) );
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}
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//-----------------------------------------------------------------------------
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bool MD5Value_t::IsZero() const
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{
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for ( int i = 0 ; i < Q_ARRAYSIZE( bits ) ; ++i )
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{
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if ( bits[i] != 0 )
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return false;
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}
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return true;
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}
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//-----------------------------------------------------------------------------
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void MD5_ProcessSingleBuffer( const void *p, int len, MD5Value_t &md5Result )
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{
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Assert( len >= 0 );
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MD5Context_t ctx;
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MD5Init( &ctx );
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MD5Update( &ctx, (unsigned char const *)p, len );
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MD5Final( md5Result.bits, &ctx );
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}
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