Merge pull request #9872 from SparkiDev/asn_improvements_1

ASN: improve handling of ASN.1 parsing/encoding

Author: douzzer

src/pk_ec.c

@@ -3581,7 +3581,7 @@ int wolfSSL_EC_KEY_LoadDer_ex(WOLFSSL_EC_KEY* key, const unsigned char* derBuf,
          * have a PKCS8 header then do not error out.
          */
         if ((ret = ToTraditionalInline_ex((const byte*)derBuf, &idx,
-                (word32)derSz, &algId)) > 0) {
+                (word32)derSz, &algId)) >= 0) {
             WOLFSSL_MSG("Found PKCS8 header");
             key->pkcs8HeaderSz = (word16)idx;
             res = 1;

src/pk_rsa.c

@@ -924,7 +924,7 @@ int wolfSSL_RSA_LoadDer_ex(WOLFSSL_RSA* rsa, const unsigned char* derBuf,
          * have a PKCS8 header then do not error out. */
         res = ToTraditionalInline_ex((const byte*)derBuf, &idx, (word32)derSz,
             &algId);
-        if (res > 0) {
+        if (res >= 0) {
             /* Store size of PKCS#8 header for encoding. */
             WOLFSSL_MSG("Found PKCS8 header");
             rsa->pkcs8HeaderSz = (word16)idx;