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1 files changed, 62 insertions, 0 deletions

diff --git a/public/tier1/checksum_md5.h b/public/tier1/checksum_md5.h
new file mode 100644
index 0000000..e7cf7ec
--- /dev/null
+++ b/public/tier1/checksum_md5.h
@@ -0,0 +1,62 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Generic MD5 hashing algo
+//
+//=============================================================================//
+
+#ifndef CHECKSUM_MD5_H
+#define CHECKSUM_MD5_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+// 16 bytes == 128 bit digest
+#define MD5_DIGEST_LENGTH 16  
+#define MD5_BIT_LENGTH ( MD5_DIGEST_LENGTH * sizeof(unsigned char) )
+struct MD5Value_t
+{
+	unsigned char bits[MD5_DIGEST_LENGTH];
+
+	void Zero();
+	bool IsZero() const;
+
+	bool operator==( const MD5Value_t &src ) const;
+	bool operator!=( const MD5Value_t &src ) const;
+
+};
+
+// MD5 Hash
+typedef struct
+{
+	unsigned int	buf[4];
+    unsigned int	bits[2];
+    unsigned char	in[64];
+} MD5Context_t;
+
+void MD5Init( MD5Context_t *context );
+void MD5Update( MD5Context_t *context, unsigned char const *buf, unsigned int len );
+void MD5Final( unsigned char digest[ MD5_DIGEST_LENGTH ], MD5Context_t *context );
+
+char *MD5_Print(unsigned char *digest, int hashlen );
+
+/// Convenience wrapper to calculate the MD5 for a buffer, all in one step, without
+/// bothering with the context object.
+void MD5_ProcessSingleBuffer( const void *p, int len, MD5Value_t &md5Result );
+
+unsigned int MD5_PseudoRandom(unsigned int nSeed);
+
+/// Returns true if the values match.
+bool MD5_Compare( const MD5Value_t &data, const MD5Value_t &compare );
+
+inline bool MD5Value_t::operator==( const MD5Value_t &src ) const
+{
+	return MD5_Compare( *this, src );
+}
+
+inline bool MD5Value_t::operator!=( const MD5Value_t &src ) const
+{
+	return !MD5_Compare( *this, src );
+}
+
+#endif // CHECKSUM_MD5_H