crypto: add CRL move operator, export as DER

include/opendht/crypto.h

@@ -327,8 +327,11 @@ class OPENDHT_PUBLIC RevocationList
 public:
     RevocationList();
     RevocationList(const Blob& b);
+    RevocationList(RevocationList&& o) : crl(o.crl) { o.crl = nullptr; }
     ~RevocationList();
 
+    RevocationList& operator=(RevocationList&& o) { crl = o.crl; o.crl = nullptr; return *this; }
+
     void pack(Blob& b) const;
     void unpack(const uint8_t* dat, size_t dat_size);
     Blob getPacked() const {

src/crypto.cpp

@@ -865,7 +865,7 @@ void
 RevocationList::pack(Blob& b) const
 {
     gnutls_datum_t gdat {nullptr, 0};
-    if (auto err = gnutls_x509_crl_export2(crl, GNUTLS_X509_FMT_PEM, &gdat)) {
+    if (auto err = gnutls_x509_crl_export2(crl, GNUTLS_X509_FMT_DER, &gdat)) {
         throw CryptoException(std::string("Can't export CRL: ") + gnutls_strerror(err));
     }
     b.insert(b.end(), gdat.data, gdat.data + gdat.size);