1HEADmaster

1 files changed, 305 insertions, 0 deletions

diff --git a/tier1/checksum_md5.cpp b/tier1/checksum_md5.cpp
new file mode 100644
index 0000000..4276d0a
--- /dev/null
+++ b/tier1/checksum_md5.cpp
@@ -0,0 +1,305 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#include "basetypes.h"
+#include "commonmacros.h"
+#include "checksum_md5.h"
+#include <string.h>
+#include <stdio.h>
+#include "tier1/strtools.h"
+#include "tier0/dbg.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// The four core functions - F1 is optimized somewhat
+// #define F1(x, y, z) (x & y | ~x & z)
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+// This is the central step in the MD5 algorithm.
+#define MD5STEP(f, w, x, y, z, data, s) \
+        ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+//-----------------------------------------------------------------------------
+// Purpose: The core of the MD5 algorithm, this alters an existing MD5 hash to
+//  reflect the addition of 16 longwords of new data.  MD5Update blocks
+//  the data and converts bytes into longwords for this routine.
+// Input  : buf[4] - 
+//			in[16] - 
+// Output : static void
+//-----------------------------------------------------------------------------
+static void MD5Transform(unsigned int buf[4], unsigned int const in[16])
+{
+    register unsigned int a, b, c, d;
+
+    a = buf[0];
+    b = buf[1];
+    c = buf[2];
+    d = buf[3];
+
+    MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+    MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+    MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+    MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+    MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+    MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+    MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+    MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+    MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+    MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+    MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+    MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+    MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+    MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+    MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+    MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+    MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+    MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+    MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+    MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+    MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+    MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+    MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+    MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+    MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+    MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+    MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+    MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+    MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+    MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+    MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+    MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+    MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+    MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+    MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+    MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+    MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+    MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+    MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+    MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+    buf[0] += a;
+    buf[1] += b;
+    buf[2] += c;
+    buf[3] += d;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious initialization constants.
+
+// Input  : *ctx - 
+//-----------------------------------------------------------------------------
+void MD5Init(MD5Context_t *ctx)
+{
+    ctx->buf[0] = 0x67452301;
+    ctx->buf[1] = 0xefcdab89;
+    ctx->buf[2] = 0x98badcfe;
+    ctx->buf[3] = 0x10325476;
+
+    ctx->bits[0] = 0;
+    ctx->bits[1] = 0;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Update context to reflect the concatenation of another buffer full of bytes.
+// Input  : *ctx - 
+//			*buf - 
+//			len - 
+//-----------------------------------------------------------------------------
+void MD5Update(MD5Context_t *ctx, unsigned char const *buf, unsigned int len)
+{
+    unsigned int t;
+
+    /* Update bitcount */
+
+    t = ctx->bits[0];
+    if ((ctx->bits[0] = t + ((unsigned int) len << 3)) < t)
+        ctx->bits[1]++;         /* Carry from low to high */
+    ctx->bits[1] += len >> 29;
+
+    t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
+
+    /* Handle any leading odd-sized chunks */
+
+    if (t)
+	{
+        unsigned char *p = (unsigned char *) ctx->in + t;
+
+        t = 64 - t;
+        if (len < t)
+		{
+            memcpy(p, buf, len);
+            return;
+        }
+        memcpy(p, buf, t);
+        //byteReverse(ctx->in, 16);
+        MD5Transform(ctx->buf, (unsigned int *) ctx->in);
+        buf += t;
+        len -= t;
+    }
+    /* Process data in 64-byte chunks */
+
+    while (len >= 64)
+	{
+        memcpy(ctx->in, buf, 64);
+        //byteReverse(ctx->in, 16);
+        MD5Transform(ctx->buf, (unsigned int *) ctx->in);
+        buf += 64;
+        len -= 64;
+    }
+
+    /* Handle any remaining bytes of data. */
+    memcpy(ctx->in, buf, len);
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Final wrapup - pad to 64-byte boundary with the bit pattern 
+// 1 0* (64-bit count of bits processed, MSB-first)
+// Input  : digest[MD5_DIGEST_LENGTH] - 
+//			*ctx - 
+//-----------------------------------------------------------------------------
+void MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5Context_t *ctx)
+{
+    unsigned count;
+    unsigned char *p;
+
+    /* Compute number of bytes mod 64 */
+    count = (ctx->bits[0] >> 3) & 0x3F;
+
+    /* Set the first char of padding to 0x80.  This is safe since there is
+       always at least one byte free */
+    p = ctx->in + count;
+    *p++ = 0x80;
+
+    /* Bytes of padding needed to make 64 bytes */
+    count = 64 - 1 - count;
+
+    /* Pad out to 56 mod 64 */
+    if (count < 8)
+	{
+        /* Two lots of padding:  Pad the first block to 64 bytes */
+        memset(p, 0, count);
+        //byteReverse(ctx->in, 16);
+        MD5Transform(ctx->buf, (unsigned int *) ctx->in);
+
+        /* Now fill the next block with 56 bytes */
+        memset(ctx->in, 0, 56);
+    }
+	else
+	{
+        /* Pad block to 56 bytes */
+        memset(p, 0, count - 8);
+    }
+    //byteReverse(ctx->in, 14);
+
+    /* Append length in bits and transform */
+    ((unsigned int *) ctx->in)[14] = ctx->bits[0];
+    ((unsigned int *) ctx->in)[15] = ctx->bits[1];
+
+    MD5Transform(ctx->buf, (unsigned int *) ctx->in);
+    //byteReverse((unsigned char *) ctx->buf, 4);
+    memcpy(digest, ctx->buf, MD5_DIGEST_LENGTH);
+    memset(ctx, 0, sizeof(*ctx));        /* In case it's sensitive */
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *hash - 
+//			hashlen - 
+// Output : char
+//-----------------------------------------------------------------------------
+char *MD5_Print( unsigned char *hash, int hashlen )
+{
+	static char szReturn[64];
+
+	Assert( hashlen <= 32 );
+
+	Q_binarytohex( hash, hashlen, szReturn, sizeof( szReturn ) );
+	return szReturn;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: generate pseudo random number from a seed number
+// Input  : seed number
+// Output : pseudo random number
+//-----------------------------------------------------------------------------
+unsigned int MD5_PseudoRandom(unsigned int nSeed)
+{
+	MD5Context_t ctx;
+	unsigned char digest[MD5_DIGEST_LENGTH]; // The MD5 Hash
+
+	memset( &ctx, 0, sizeof( ctx ) );
+		
+	MD5Init(&ctx);
+	MD5Update(&ctx, (unsigned char*)&nSeed, sizeof(nSeed) );
+	MD5Final(digest, &ctx);
+
+	return *(unsigned int*)(digest+6);	// use 4 middle bytes for random value
+}
+
+//-----------------------------------------------------------------------------
+bool MD5_Compare( const MD5Value_t &data, const MD5Value_t &compare )
+{
+	return V_memcmp( data.bits, compare.bits, MD5_DIGEST_LENGTH ) == 0;
+}
+
+//-----------------------------------------------------------------------------
+void MD5Value_t::Zero()
+{
+	V_memset( bits, 0, sizeof( bits ) );
+}
+
+//-----------------------------------------------------------------------------
+bool MD5Value_t::IsZero() const
+{
+	for ( int i = 0 ; i < Q_ARRAYSIZE( bits ) ; ++i )
+	{
+		if ( bits[i] != 0 )
+			return false;
+	}
+
+	return true;
+}
+
+//-----------------------------------------------------------------------------
+void MD5_ProcessSingleBuffer( const void *p, int len, MD5Value_t &md5Result )
+{
+	Assert( len >= 0 );
+	MD5Context_t ctx;
+	MD5Init( &ctx );
+	MD5Update( &ctx, (unsigned char const *)p, len );
+	MD5Final( md5Result.bits, &ctx );
+}