diff --git a/backends/twitter/libtwitcurl/SHA1.h b/backends/twitter/libtwitcurl/SHA1.h
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+/*
+	100% free public domain implementation of the SHA-1 algorithm
+	by Dominik Reichl <dominik.reichl@t-online.de>
+	Web: http://www.dominik-reichl.de/
+
+	Version 1.6 - 2005-02-07 (thanks to Howard Kapustein for patches)
+	- You can set the endianness in your files, no need to modify the
+	  header file of the CSHA1 class any more
+	- Aligned data support
+	- Made support/compilation of the utility functions (ReportHash
+	  and HashFile) optional (useful, if bytes count, for example in
+	  embedded environments)
+
+	Version 1.5 - 2005-01-01
+	- 64-bit compiler compatibility added
+	- Made variable wiping optional (define SHA1_WIPE_VARIABLES)
+	- Removed unnecessary variable initializations
+	- ROL32 improvement for the Microsoft compiler (using _rotl)
+
+	======== 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
+*/
+
+#ifndef ___SHA1_HDR___
+#define ___SHA1_HDR___
+
+#if !defined(SHA1_UTILITY_FUNCTIONS) && !defined(SHA1_NO_UTILITY_FUNCTIONS)
+#define SHA1_UTILITY_FUNCTIONS
+#endif
+
+#include <memory.h> // Needed for memset and memcpy
+
+#ifdef SHA1_UTILITY_FUNCTIONS
+#include <stdio.h>  // Needed for file access and sprintf
+#include <string.h> // Needed for strcat and strcpy
+#endif
+
+#ifdef _MSC_VER
+#include <stdlib.h>
+#endif
+
+// You can define the endian mode in your files, without modifying the SHA1
+// source files. Just #define SHA1_LITTLE_ENDIAN or #define SHA1_BIG_ENDIAN
+// in your files, before including the SHA1.h header file. If you don't
+// define anything, the class defaults to little endian.
+
+#if !defined(SHA1_LITTLE_ENDIAN) && !defined(SHA1_BIG_ENDIAN)
+#define SHA1_LITTLE_ENDIAN
+#endif
+
+// Same here. If you want variable wiping, #define SHA1_WIPE_VARIABLES, if
+// not, #define SHA1_NO_WIPE_VARIABLES. If you don't define anything, it
+// defaults to wiping.
+
+#if !defined(SHA1_WIPE_VARIABLES) && !defined(SHA1_NO_WIPE_VARIABLES)
+#define SHA1_WIPE_VARIABLES
+#endif
+
+/////////////////////////////////////////////////////////////////////////////
+// Define 8- and 32-bit variables
+
+#ifndef UINT_32
+
+#ifdef _MSC_VER
+
+#define UINT_8  unsigned __int8
+#define UINT_32 unsigned __int32
+
+#else
+
+#define UINT_8 unsigned char
+
+#if (ULONG_MAX == 0xFFFFFFFF)
+#define UINT_32 unsigned long
+#else
+#define UINT_32 unsigned int
+#endif
+
+#endif
+#endif
+
+/////////////////////////////////////////////////////////////////////////////
+// Declare SHA1 workspace
+
+typedef union
+{
+	UINT_8  c[64];
+	UINT_32 l[16];
+} SHA1_WORKSPACE_BLOCK;
+
+class CSHA1
+{
+public:
+#ifdef SHA1_UTILITY_FUNCTIONS
+	// Two different formats for ReportHash(...)
+	enum
+	{
+		REPORT_HEX = 0,
+		REPORT_DIGIT = 1
+	};
+#endif
+
+	// Constructor and Destructor
+	CSHA1();
+	~CSHA1();
+
+	UINT_32 m_state[5];
+	UINT_32 m_count[2];
+	UINT_32 __reserved1[1];
+	UINT_8  m_buffer[64];
+	UINT_8  m_digest[20];
+	UINT_32 __reserved2[3];
+
+	void Reset();
+
+	// Update the hash value
+	void Update(UINT_8 *data, UINT_32 len);
+#ifdef SHA1_UTILITY_FUNCTIONS
+	bool HashFile(char *szFileName);
+#endif
+
+	// Finalize hash and report
+	void Final();
+
+	// Report functions: as pre-formatted and raw data
+#ifdef SHA1_UTILITY_FUNCTIONS
+	void ReportHash(char *szReport, unsigned char uReportType = REPORT_HEX);
+#endif
+	void GetHash(UINT_8 *puDest);
+
+private:
+	// Private SHA-1 transformation
+	void Transform(UINT_32 *state, UINT_8 *buffer);
+
+	// Member variables
+	UINT_8 m_workspace[64];
+	SHA1_WORKSPACE_BLOCK *m_block; // SHA1 pointer to the byte array above
+};
+
+#endif