XMSS/XMSSMT hooks support: fix build.

INSTALL

@@ -401,10 +401,16 @@ We also have vcpkg ports for wolftpm, wolfmqtt and curl.
     The patch may be found in the wolfssl-examples repo here:
       pq/stateful_hash_sig/0001-Patch-to-support-xmss-reference-integration.patch
 
+    To build patched xmss-reference:
+      $ make xmss_lib.a
+
+    To build verify-only patched xmss-reference:
+      $ make xmss_verify_lib.a
+
     Note that this patch adds wolfCrypt SHA256 hashing to xmss-reference, and
     thus benefits from all the same asm speedups as wolfCrypt SHA hashing.
     Depending on architecture you may build with --enable-intelasm, or
-    and --enable-armasm, and see 30-50% speedups in XMSS/XMSS^MT.
+    and --enable-armasm, and see 30-40% speedups in XMSS/XMSS^MT.
 
     For full keygen, signing, verifying, and benchmarking support, build
     wolfSSL with:

configure.ac

@@ -1201,10 +1201,32 @@ AC_ARG_WITH([libxmss],
             AC_MSG_ERROR([libxmss isn't found.
             If it's already installed, specify its path using --with-libxmss=/dir/])
         fi
+        if test "$XMSS_VERIFY_ONLY" = "yes"; then
+            if test -e $trylibxmssdir/xmss_verify_lib.a; then
+                CPPFLAGS="$AM_CPPFLAGS -DHAVE_LIBXMSS -I$trylibxmssdir"
+                LIB_STATIC_ADD="$LIB_STATIC_ADD $trylibxmssdir/xmss_verify_lib.a"
+                enable_shared=no
+                enable_static=yes
+                libxmss_linked=yes
+            else
+                AC_MSG_ERROR([xmss_verify_lib.a isn't found.
+                If it's already installed, specify its path using --with-libxmss=/dir/])
+            fi
+        elif test -e $trylibxmssdir/xmss_lib.a; then
+            CPPFLAGS="$AM_CPPFLAGS -DHAVE_LIBXMSS -I$trylibxmssdir"
+            LIB_STATIC_ADD="$LIB_STATIC_ADD $trylibxmssdir/xmss_lib.a"
+            enable_shared=no
+            enable_static=yes
+            libxmss_linked=yes
+        else
+            AC_MSG_ERROR([libxmss isn't found.
+            If it's already installed, specify its path using --with-libxmss=/dir/])
+        fi
 
         XMSS_ROOT=$trylibxmssdir
 
         AC_MSG_RESULT([yes])
+        AM_CPPFLAGS="$CPPFLAGS"
 
         AM_CFLAGS="$AM_CFLAGS -DHAVE_LIBXMSS -I$trylibxmssdir"
         ENABLED_LIBXMSS="yes"
@@ -1213,7 +1235,6 @@ AC_ARG_WITH([libxmss],
     [XMSS_ROOT=""]
 )
 
-
 # LMS
 AC_ARG_ENABLE([lms],
     [AS_HELP_STRING([--enable-lms],[Enable stateful LMS/HSS signatures (default: disabled)])],
@@ -9032,6 +9053,7 @@ AM_CONDITIONAL([BUILD_GE448], [test "x$ENABLED_GE448" = "xyes" || test "x$ENABLE
 AM_CONDITIONAL([BUILD_CURVE448],[test "x$ENABLED_CURVE448" = "xyes" || test "x$ENABLED_USERSETTINGS" = "xyes"])
 AM_CONDITIONAL([BUILD_CURVE448_SMALL],[test "x$ENABLED_CURVE448_SMALL" = "xyes" || test "x$ENABLED_USERSETTINGS" = "xyes"])
 AM_CONDITIONAL([BUILD_WC_LMS],[test "x$ENABLED_WC_LMS" != "xno" || test "x$ENABLED_USERSETTINGS" = "xyes"])
+AM_CONDITIONAL([BUILD_WC_XMSS],[test "x$ENABLED_WC_XMSS" != "xno" || test "x$ENABLED_USERSETTINGS" = "xyes"])
 AM_CONDITIONAL([BUILD_WC_KYBER],[test "x$ENABLED_WC_KYBER" != "xno" || test "x$ENABLED_USERSETTINGS" = "xyes"])
 AM_CONDITIONAL([BUILD_ECCSI],[test "x$ENABLED_ECCSI" = "xyes" || test "x$ENABLED_USERSETTINGS" = "xyes"])
 AM_CONDITIONAL([BUILD_SAKKE],[test "x$ENABLED_SAKKE" = "xyes" || test "x$ENABLED_USERSETTINGS" = "xyes"])

src/include.am

@@ -702,6 +702,10 @@ if BUILD_WC_LMS
 src_libwolfssl@LIBSUFFIX@_la_SOURCES += wolfcrypt/src/wc_lms.c
 endif
 
+if BUILD_WC_XMSS
+src_libwolfssl@LIBSUFFIX@_la_SOURCES += wolfcrypt/src/wc_xmss.c
+endif
+
 if BUILD_CURVE25519
 src_libwolfssl@LIBSUFFIX@_la_SOURCES += wolfcrypt/src/curve25519.c
 endif
@@ -809,14 +813,6 @@ endif
 
 if BUILD_LIBXMSS
 src_libwolfssl@LIBSUFFIX@_la_SOURCES += wolfcrypt/src/ext_xmss.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/params.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/thash.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/hash_address.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/wots.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/xmss.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/xmss_core_fast.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/xmss_commons.c
-src_libwolfssl@LIBSUFFIX@_la_SOURCES += $(XMSS_ROOT)/utils.c
 endif
 
 if BUILD_LIBZ

wolfcrypt/src/ext_xmss.c

@@ -26,6 +26,7 @@
 #include <wolfssl/wolfcrypt/settings.h>
 #include <wolfssl/wolfcrypt/error-crypt.h>
 #include <wolfssl/wolfcrypt/logging.h>
+#include <wolfssl/wolfcrypt/sha256.h>
 
 #ifdef WOLFSSL_HAVE_XMSS
 #include <wolfssl/wolfcrypt/ext_xmss.h>
@@ -37,6 +38,63 @@
     #include <wolfcrypt/src/misc.c>
 #endif
 
+#include <xmss_callbacks.h>
+
+#ifndef WOLFSSL_XMSS_VERIFY_ONLY
+static THREAD_LS_T WC_RNG * xmssRng = NULL;
+
+/* RNG callback used by xmss.
+ * */
+static int rng_cb(void * output, size_t length)
+{
+    int ret = 0;
+
+    if (output == NULL || xmssRng == NULL) {
+        return -1;
+    }
+
+    if (length == 0) {
+        return 0;
+    }
+
+    ret = wc_RNG_GenerateBlock(xmssRng, output, (word32) length);
+
+    if (ret) {
+        WOLFSSL_MSG("error: xmss rng_cb failed");
+        return -1;
+    }
+
+    return 0;
+}
+#endif /* ifndef WOLFSSL_XMSS_VERIFY_ONLY */
+
+/* SHA256 callback used by xmss.
+ * */
+static int sha256_cb(const unsigned char *in, unsigned long long inlen,
+                     unsigned char *out)
+{
+    wc_Sha256 sha;
+
+    if (wc_InitSha256_ex(&sha, NULL, INVALID_DEVID) != 0) {
+        WOLFSSL_MSG("SHA256 Init failed");
+        return -1;
+    }
+
+    if (wc_Sha256Update(&sha, in, (word32) inlen) != 0) {
+        WOLFSSL_MSG("SHA256 Update failed");
+        return -1;
+    }
+
+    if (wc_Sha256Final(&sha, out) != 0) {
+        WOLFSSL_MSG("SHA256 Final failed");
+        wc_Sha256Free(&sha);
+        return -1;
+    }
+    wc_Sha256Free(&sha);
+
+    return 0;
+}
+
 /* Init an Xmss key.
  *
  * Call this before setting the parms of an Xmss key.
@@ -119,6 +177,20 @@ static int wc_XmssKey_SetOid(XmssKey * key, uint32_t oid, int is_xmssmt)
         return -1;
     }
 
+    ret = xmss_set_sha_cb(sha256_cb);
+    if (ret != 0) {
+        WOLFSSL_MSG("error: xmss_set_sha_cb failed");
+        return -1;
+    }
+
+#ifndef WOLFSSL_XMSS_VERIFY_ONLY
+    ret = xmss_set_rng_cb(rng_cb);
+    if (ret != 0) {
+        WOLFSSL_MSG("error: xmss_set_rng_cb failed");
+        return -1;
+    }
+#endif
+
     key->oid = oid;
     key->is_xmssmt = is_xmssmt;
     key->state = WC_XMSS_STATE_PARMSET;
@@ -401,13 +473,15 @@ int wc_XmssKey_MakeKey(XmssKey* key, WC_RNG * rng)
         return ret;
     }
 
+    xmssRng = rng;
+
     /* Finally make the secret public key pair. Immediately write it to NV
      * storage and then clear from memory. */
     if (key->is_xmssmt) {
-        ret = xmssmt_keypair(key->pk, key->sk, key->oid, rng);
+        ret = xmssmt_keypair(key->pk, key->sk, key->oid);
     }
     else {
-        ret = xmss_keypair(key->pk, key->sk, key->oid, rng);
+        ret = xmss_keypair(key->pk, key->sk, key->oid);
     }
 
     if (ret == 0) {

wolfssl/wolfcrypt/xmss.h

@@ -144,7 +144,6 @@ WOLFSSL_API int  wc_XmssKey_ImportPubRaw(XmssKey * key, const byte * in,
     word32 inLen);
 WOLFSSL_API int  wc_XmssKey_Verify(XmssKey * key, const byte * sig, word32 sigSz,
     const byte * msg, int msgSz);
-WOLFSSL_API const char * wc_XmssKey_RcToStr(enum wc_XmssRc lmsRc);
 #ifdef __cplusplus
     } /* extern "C" */
 #endif