Disable XTS-384 as an allowed use in FIPS mode

Author: kaleb-himes

fips-check.sh

@@ -240,9 +240,9 @@ linuxv5|linuxv5.2.1)
   )
   ;;
 v6.0.0)
-  WOLF_REPO_TAG='WCv6.0.0-RC3'
+  WOLF_REPO_TAG='WCv6.0.0-RC4'
   FIPS_REPO_TAG='WCv6.0.0-RC4'
-  ASM_PICKUPS_TAG='WCv6.0.0-RC3'
+  ASM_PICKUPS_TAG='WCv6.0.0-RC4'
   FIPS_OPTION='v6'
   FIPS_FILES=(
     "wolfcrypt/src/fips.c:${FIPS_REPO_TAG}"

wolfcrypt/src/aes.c

@@ -12818,7 +12818,12 @@ int wc_AesXtsSetKeyNoInit(XtsAes* aes, const byte* key, word32 len, int dir)
     }
 
     if ((len != (AES_128_KEY_SIZE*2)) &&
+#ifndef HAVE_FIPS
+        /* XTS-384 not allowed by FIPS and can not be treated like
+         * RSA-4096 bit keys back in the day, can not vendor affirm
+         * the use of 2 concatenated 192-bit keys (XTS-384) */
         (len != (AES_192_KEY_SIZE*2)) &&
+#endif
         (len != (AES_256_KEY_SIZE*2)))
     {
         WOLFSSL_MSG("Unsupported key size");