mesa: Add mesa SHA-1 functions

The upcoming shader cache uses the SHA-1 algorithm for cryptographic
naming. These new mesa_sha1 functions are implemented with any one of
several differeny cryptographics libraries.

This code was copied from the xserver repository, (where it has
apparently been functioning well on a variety of operating systems),
and comes licensed with a license identical to that of Mesa.

Bug fixes by José Fonseca <jfonseca@vmware.com>: Fix to put
conditional assignment in Makefile.am, not Makefile.sources to avoid
breaking scons build. Fix include file for CryptoAPI section. Fix
missing cast in openssl section.

Reviewed-by: Matt Turner <mattst88@gmail.com>

configure.ac

@@ -9,6 +9,7 @@ dnl Copyright © 2009-2014 Jon TURNEY
 dnl Copyright © 2011-2012 Benjamin Franzke
 dnl Copyright © 2008-2014 David Airlie
 dnl Copyright © 2009-2013 Brian Paul
+dnl Copyright © 2003-2007 Keith Packard, Daniel Stone
 dnl
 dnl Permission is hereby granted, free of charge, to any person obtaining a
 dnl copy of this software and associated documentation files (the "Software"),
@@ -924,6 +925,129 @@ fi
 
 AC_SUBST([MESA_LLVM])
 
+# SHA1 hashing
+AC_ARG_WITH([sha1],
+        [AS_HELP_STRING([--with-sha1=libc|libmd|libnettle|libgcrypt|libcrypto|libsha1|CommonCrypto|CryptoAPI],
+        [choose SHA1 implementation])])
+case "x$with_sha1" in
+x | xlibc | xlibmd | xlibnettle | xlibgcrypt | xlibcrypto | xlibsha1 | xCommonCrypto | xCryptoAPI)
+  ;;
+*)
+        AC_MSG_ERROR([Illegal value for --with-sha1: $with_sha1])
+esac
+
+AC_CHECK_FUNC([SHA1Init], [HAVE_SHA1_IN_LIBC=yes])
+if test "x$with_sha1" = x && test "x$HAVE_SHA1_IN_LIBC" = xyes; then
+	with_sha1=libc
+fi
+if test "x$with_sha1" = xlibc && test "x$HAVE_SHA1_IN_LIBC" != xyes; then
+	AC_MSG_ERROR([sha1 in libc requested but not found])
+fi
+if test "x$with_sha1" = xlibc; then
+	AC_DEFINE([HAVE_SHA1_IN_LIBC], [1],
+		[Use libc SHA1 functions])
+	SHA1_LIBS=""
+fi
+AC_CHECK_FUNC([CC_SHA1_Init], [HAVE_SHA1_IN_COMMONCRYPTO=yes])
+if test "x$with_sha1" = x && test "x$HAVE_SHA1_IN_COMMONCRYPTO" = xyes; then
+	with_sha1=CommonCrypto
+fi
+if test "x$with_sha1" = xCommonCrypto && test "x$HAVE_SHA1_IN_COMMONCRYPTO" != xyes; then
+	AC_MSG_ERROR([CommonCrypto requested but not found])
+fi
+if test "x$with_sha1" = xCommonCrypto; then
+	AC_DEFINE([HAVE_SHA1_IN_COMMONCRYPTO], [1],
+		[Use CommonCrypto SHA1 functions])
+	SHA1_LIBS=""
+fi
+dnl stdcall functions cannot be tested with AC_CHECK_LIB
+AC_CHECK_HEADER([wincrypt.h], [HAVE_SHA1_IN_CRYPTOAPI=yes], [], [#include <windows.h>])
+if test "x$with_sha1" = x && test "x$HAVE_SHA1_IN_CRYPTOAPI" = xyes; then
+	with_sha1=CryptoAPI
+fi
+if test "x$with_sha1" = xCryptoAPI && test "x$HAVE_SHA1_IN_CRYPTOAPI" != xyes; then
+	AC_MSG_ERROR([CryptoAPI requested but not found])
+fi
+if test "x$with_sha1" = xCryptoAPI; then
+	AC_DEFINE([HAVE_SHA1_IN_CRYPTOAPI], [1],
+		[Use CryptoAPI SHA1 functions])
+	SHA1_LIBS=""
+fi
+AC_CHECK_LIB([md], [SHA1Init], [HAVE_LIBMD=yes])
+if test "x$with_sha1" = x && test "x$HAVE_LIBMD" = xyes; then
+	with_sha1=libmd
+fi
+if test "x$with_sha1" = xlibmd && test "x$HAVE_LIBMD" != xyes; then
+	AC_MSG_ERROR([libmd requested but not found])
+fi
+if test "x$with_sha1" = xlibmd; then
+	AC_DEFINE([HAVE_SHA1_IN_LIBMD], [1],
+	          [Use libmd SHA1 functions])
+	SHA1_LIBS=-lmd
+fi
+PKG_CHECK_MODULES([LIBSHA1], [libsha1], [HAVE_LIBSHA1=yes], [HAVE_LIBSHA1=no])
+if test "x$with_sha1" = x && test "x$HAVE_LIBSHA1" = xyes; then
+   with_sha1=libsha1
+fi
+if test "x$with_sha1" = xlibsha1 && test "x$HAVE_LIBSHA1" != xyes; then
+	AC_MSG_ERROR([libsha1 requested but not found])
+fi
+if test "x$with_sha1" = xlibsha1; then
+	AC_DEFINE([HAVE_SHA1_IN_LIBSHA1], [1],
+	          [Use libsha1 for SHA1])
+	SHA1_LIBS=-lsha1
+fi
+AC_CHECK_LIB([nettle], [nettle_sha1_init], [HAVE_LIBNETTLE=yes])
+if test "x$with_sha1" = x && test "x$HAVE_LIBNETTLE" = xyes; then
+	with_sha1=libnettle
+fi
+if test "x$with_sha1" = xlibnettle && test "x$HAVE_LIBNETTLE" != xyes; then
+	AC_MSG_ERROR([libnettle requested but not found])
+fi
+if test "x$with_sha1" = xlibnettle; then
+	AC_DEFINE([HAVE_SHA1_IN_LIBNETTLE], [1],
+	          [Use libnettle SHA1 functions])
+	SHA1_LIBS=-lnettle
+fi
+AC_CHECK_LIB([gcrypt], [gcry_md_open], [HAVE_LIBGCRYPT=yes])
+if test "x$with_sha1" = x && test "x$HAVE_LIBGCRYPT" = xyes; then
+	with_sha1=libgcrypt
+fi
+if test "x$with_sha1" = xlibgcrypt && test "x$HAVE_LIBGCRYPT" != xyes; then
+	AC_MSG_ERROR([libgcrypt requested but not found])
+fi
+if test "x$with_sha1" = xlibgcrypt; then
+	AC_DEFINE([HAVE_SHA1_IN_LIBGCRYPT], [1],
+	          [Use libgcrypt SHA1 functions])
+	SHA1_LIBS=-lgcrypt
+fi
+# We don't need all of the OpenSSL libraries, just libcrypto
+AC_CHECK_LIB([crypto], [SHA1_Init], [HAVE_LIBCRYPTO=yes])
+PKG_CHECK_MODULES([OPENSSL], [openssl], [HAVE_OPENSSL_PKC=yes],
+                  [HAVE_OPENSSL_PKC=no])
+if test "x$HAVE_LIBCRYPTO" = xyes || test "x$HAVE_OPENSSL_PKC" = xyes; then
+	if test "x$with_sha1" = x; then
+		with_sha1=libcrypto
+	fi
+else
+	if test "x$with_sha1" = xlibcrypto; then
+		AC_MSG_ERROR([OpenSSL libcrypto requested but not found])
+	fi
+fi
+if test "x$with_sha1" = xlibcrypto; then
+	if test "x$HAVE_LIBCRYPTO" = xyes; then
+		SHA1_LIBS=-lcrypto
+	else
+		SHA1_LIBS="$OPENSSL_LIBS"
+		SHA1_CFLAGS="$OPENSSL_CFLAGS"
+	fi
+fi
+AC_MSG_CHECKING([for SHA1 implementation])
+AM_CONDITIONAL([HAVE_SHA1], [test x$with_sha1 != x])
+AC_MSG_RESULT([$with_sha1])
+AC_SUBST(SHA1_LIBS)
+AC_SUBST(SHA1_CFLAGS)
+
 # Check for libdrm
 PKG_CHECK_MODULES([LIBDRM], [libdrm >= $LIBDRM_REQUIRED],
                   [have_libdrm=yes], [have_libdrm=no])