Fix non constant compare of TLS 1.3 binder, check for negative dst_len in wc_XChaCha20Poly1305_crypt_oneshot.

Author: kareem-wolfssl

src/tls13.c

@@ -6201,7 +6201,8 @@ static int DoPreSharedKeys(WOLFSSL* ssl, const byte* input, word32 inputSz,
         if (ret != 0)
             return ret;
         if (binderLen != current->binderLen ||
-                             XMEMCMP(binder, current->binder, binderLen) != 0) {
+                             ConstantCompare(binder, current->binder,
+                                binderLen) != 0) {
             WOLFSSL_ERROR_VERBOSE(BAD_BINDER);
             return BAD_BINDER;
         }

wolfcrypt/src/chacha20_poly1305.c

@@ -401,7 +401,7 @@ static WC_INLINE int wc_XChaCha20Poly1305_crypt_oneshot(
         goto out;
     }
 
-    if ((long int)dst_space < dst_len) {
+    if (dst_len <= 0 || (long int)dst_space < dst_len) {
         ret = BUFFER_E;
         goto out;
     }