Add support for --with-wolfcrypt=/dir/. Fix for build error with `-…

…-disable-wolfcrypt`. Fix for unused `auth` in store example. ZD 12204

configure.ac

@@ -127,6 +127,26 @@ fi
 
 
 # wolfCrypt
+AC_MSG_CHECKING([for wolfSSL])
+WOLFSSL_URL="http://www.wolfssl.com/download.html"
+AC_ARG_WITH(wolfcrypt,
+  [AC_HELP_STRING([--with-wolfcrypt=PATH], [PATH to wolfssl install (default /usr/local)])],
+  [
+    if test "x$withval" != "xno" ; then
+      if test -d "$withval/lib"; then
+        LDFLAGS="$LDFLAGS -L${withval}/lib"
+      fi
+      if test -d "$withval/include"; then
+        CPPFLAGS="$CPPFLAGS -I${withval}/include"
+      fi
+    fi
+    if test "x$withval" = "xyes" ; then
+      LDFLAGS="$LDFLAGS -L/usr/local/lib"
+      CPPFLAGS="$CPPFLAGS -I/usr/local/include"
+    fi
+  ]
+)
+
 AC_ARG_ENABLE([wolfcrypt],
     [AS_HELP_STRING([--enable-wolfcrypt],[Enable wolfCrypt hooks for RNG, Auth Sessions and Parameter encryption (default: enabled)])],
     [ ENABLED_WOLFCRYPT=$enableval ],
@@ -135,12 +155,33 @@ AC_ARG_ENABLE([wolfcrypt],
 
 if test "x$ENABLED_WOLFCRYPT" = "xyes"
 then
-    TAO_REQUIRE_LIBWOLFSSL
+    LIBS="$LIBS -lwolfssl"
+
+    AC_LIB_HAVE_LINKFLAGS(wolfssl,,
+    [
+        #include <wolfssl/wolfcrypt/wc_port.h>
+    ],[
+        wolfCrypt_Init();
+    ])
+    AM_CONDITIONAL(HAVE_LIBWOLFSSL, [test "x${ac_cv_libwolfssl}" = "xyes"])
+
+    AS_IF([test "x${ac_cv_libwolfssl}" = "xyes"],[
+        save_LIBS="${LIBS}"
+        LIBS="${LIBS} ${LTLIBWOLFSSL}"
+        AC_CHECK_FUNCS(wolfCrypt_Cleanup)
+        LIBS="$save_LIBS"
+    ])
+
+    if test "x$ac_cv_libwolfssl" = "xno" && test "x$ENABLED_WOLFCRYPT" = "xno"; then
+      AC_MSG_ERROR([WolfSSL library not found. You can get it from $WOLFSSL_URL
+        If it's already installed, specify its path using --with-wolfcrypt=/dir/])
+    fi
 else
     AM_CFLAGS="$AM_CFLAGS -DWOLFTPM2_NO_WOLFCRYPT"
 fi
 
 
+
 # I2C Support
 AC_ARG_ENABLE([i2c],
     [AS_HELP_STRING([--enable-i2c],[Enable I2C TPM Support (default: disabled)])],

examples/attestation/activate_credential.c

@@ -54,10 +54,12 @@ int TPM2_ActivateCredential_Example(void* userCtx, int argc, char *argv[])
     WOLFTPM2_KEY storage;
     WOLFTPM2_KEYBLOB akKey;
     WOLFTPM2_SESSION tpmSession;
+#if !defined(WOLFTPM2_NO_WOLFCRYPT) && !defined(NO_FILESYSTEM)
     FILE *fp;
+    int dataSize = 0;
+#endif
     const char *input = "cred.blob";
     const char *keyblob = "keyblob.bin";
-    int dataSize = 0;
 
     union {
         ActivateCredential_In activCred;

examples/attestation/make_credential.c

@@ -51,10 +51,12 @@ int TPM2_MakeCredential_Example(void* userCtx, int argc, char *argv[])
     WOLFTPM2_DEV dev;
     WOLFTPM2_KEY storage;
     WOLFTPM2_KEYBLOB akKey;
+#if !defined(WOLFTPM2_NO_WOLFCRYPT) && !defined(NO_FILESYSTEM)
     FILE *fp;
+    int dataSize = 0;
+#endif
     const char *output = "cred.blob";
     const char *keyblob = "keyblob.bin";
-    int dataSize = 0;
 
     union {
         MakeCredential_In makeCred;

examples/nvram/store.c

@@ -62,7 +62,6 @@ int TPM2_NVRAM_Store_Example(void* userCtx, int argc, char *argv[])
     WOLFTPM2_SESSION tpmSession;
     WOLFTPM2_HANDLE parent;
     WOLFTPM2_NV nv;
-    TPM2B_AUTH auth;
     word32 nvAttributes;
     const char* filename = "keyblob.bin";
     int paramEncAlg = TPM_ALG_NULL;
@@ -112,7 +111,6 @@ int TPM2_NVRAM_Store_Example(void* userCtx, int argc, char *argv[])
     XMEMSET(&keyBlob, 0, sizeof(keyBlob));
     XMEMSET(&tpmSession, 0, sizeof(tpmSession));
     XMEMSET(&parent, 0, sizeof(parent));
-    XMEMSET(&auth, 0, sizeof(auth));
 
     rc = wolfTPM2_Init(&dev, TPM2_IoCb, userCtx);
     if (rc != TPM_RC_SUCCESS) {