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diff --git a/public/tier1/checksum_sha1.h b/public/tier1/checksum_sha1.h
new file mode 100644
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+++ b/public/tier1/checksum_sha1.h
@@ -0,0 +1,174 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Implementation of SHA-1
+//
+//=============================================================================
+
+#ifndef CHECKSUM_SHA1_H
+#define CHECKSUM_SHA1_H
+
+#if defined( _WIN32 )
+#pragma once
+#endif
+
+/*
+	100% free public domain implementation of the SHA-1
+	algorithm by Dominik Reichl <[email protected]>
+
+
+	=== Test Vectors (from FIPS PUB 180-1) ===
+
+	SHA1("abc") =
+		A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
+
+	SHA1("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") =
+		84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
+
+	SHA1(A million repetitions of "a") =
+		34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
+*/
+
+#if !defined(_MINIMUM_BUILD_)
+#include <stdio.h>  // Needed for file access
+#if defined( _PS3 )
+#include <sys/memory.h>
+#else
+#include <memory.h>
+#endif
+#include <string.h> // Needed for strcat and strcpy
+#endif
+
+// If you're compiling big endian, just comment out the following line
+#define SHA1_LITTLE_ENDIAN
+
+typedef union
+{
+	unsigned char c[64];
+	unsigned long l[16];
+} SHA1_WORKSPACE_BLOCK;
+
+// SHA1 hash
+const unsigned int k_cubHash = 20;
+const unsigned int k_cchHash = 41; // k_cubHash * 2, plus 1 for terminator
+#pragma pack( push, 1 )
+typedef	unsigned char SHADigest_t[ k_cubHash ];
+#pragma pack( pop )
+
+#if !defined(_MINIMUM_BUILD_)
+class CSHA1
+#else 
+class Minimum_CSHA1 
+#endif
+{
+public:
+	// Two different formats for ReportHash(...)
+	enum
+	{
+		REPORT_HEX = 0,
+		REPORT_DIGIT = 1
+	};
+
+	// Constructor and Destructor
+#if !defined(_MINIMUM_BUILD_) 
+	CSHA1();
+	virtual ~CSHA1() ;
+#else
+	Minimum_CSHA1() ; 
+	~Minimum_CSHA1() ;	// no virtual destructor's in the minimal builds !
+#endif	
+
+	unsigned long m_state[5];
+	unsigned long m_count[2];
+	unsigned char m_buffer[64];
+	unsigned char m_digest[k_cubHash];
+
+	void Reset();
+
+	// Update the hash value
+	void Update(unsigned char *data, unsigned int len);
+#if !defined(_MINIMUM_BUILD_) 
+	bool HashFile(char *szFileName);
+#endif
+
+	// Finalize hash and report
+	void Final();
+#if !defined(_MINIMUM_BUILD_) 
+	void ReportHash(char *szReport, unsigned char uReportType = REPORT_HEX);
+#endif
+	void GetHash(unsigned char *uDest);
+
+private:
+	// Private SHA-1 transformation
+	void Transform(unsigned long state[5], unsigned char buffer[64]);
+
+	// Member variables
+	unsigned char m_workspace[64];
+	SHA1_WORKSPACE_BLOCK *m_block; // SHA1 pointer to the byte array above
+};
+
+#define GenerateHash( hash, pubData, cubData ) { CSHA1 sha1; sha1.Update( (byte *)pubData, cubData ); sha1.Final(); sha1.GetHash( hash ); } 
+
+#if !defined(_MINIMUM_BUILD_)
+// hash comparison function, for use with CUtlMap/CUtlRBTree
+bool HashLessFunc( SHADigest_t const &lhs, SHADigest_t const &rhs );
+
+// utility class for manipulating SHA1 hashes in their compact form
+struct CSHA
+{
+public:
+	SHADigest_t m_shaDigest;
+
+	CSHA()
+	{
+		memset( m_shaDigest, 0, k_cubHash );
+	}
+
+	explicit CSHA( const SHADigest_t rhs )
+	{
+		memcpy( m_shaDigest, rhs, k_cubHash );
+	}
+
+	SHADigest_t &SHADigest()
+	{
+		return m_shaDigest;
+	}
+
+	bool operator<( const CSHA &rhs ) const
+	{
+		return memcmp( m_shaDigest, rhs.m_shaDigest, k_cubHash ) < 0;
+	}
+
+	bool operator==( const CSHA &rhs ) const
+	{
+		return memcmp( m_shaDigest, rhs.m_shaDigest, k_cubHash ) == 0;
+	}
+
+	bool operator!=( const CSHA &rhs ) const
+	{
+		return !(*this == rhs);
+	}
+
+	bool operator==( const SHADigest_t &rhs ) const
+	{
+		return memcmp( m_shaDigest, rhs, k_cubHash ) == 0;
+	}
+
+	bool operator!=( const SHADigest_t &rhs ) const
+	{
+		return !(*this == rhs);
+	}
+
+	CSHA &operator=( const SHADigest_t rhs )
+	{
+		memcpy( m_shaDigest, rhs, k_cubHash );
+		return *this;
+	}
+
+	void AssignTo( SHADigest_t rhs ) const
+	{
+		memcpy( rhs, m_shaDigest, k_cubHash );
+	}
+};
+#endif // _MINIMUM_BUILD_
+
+#endif // CHECKSUM_SHA1_H