Add BignumPointer::bigLength

Author: jasnell

include/ncrypto.h

@@ -526,6 +526,7 @@ class BignumPointer final {
   unsigned long getWord() const;  // NOLINT(runtime/int)
 
   size_t byteLength() const;
+  size_t bitLength() const;
 
   DataPointer toHex() const;
   DataPointer encode() const;

src/ncrypto.cpp

@@ -242,10 +242,15 @@ void BignumPointer::reset(const unsigned char* data, size_t len) {
 BIGNUM* BignumPointer::release() { return bn_.release(); }
 
 size_t BignumPointer::byteLength() const {
-  if (bn_ == nullptr) return 0;
+  if (!bn_) return 0;
   return BN_num_bytes(bn_.get());
 }
 
+size_t BignumPointer::bitLength() const {
+  if (!bn_) return 0;
+  return BN_num_bits(bn_.get());
+}
+
 DataPointer BignumPointer::encode() const {
   return EncodePadded(bn_.get(), byteLength());
 }