Expose additional helper methods

Author: npaun

include/ncrypto.h

@@ -1790,12 +1790,19 @@ class Aead final : public ModeMixin<Aead> {
   static const Aead FromName(std::string_view name);
 
   // TODO(npaun): BoringSSL does not define NIDs for all AEADs.
-  // Decide if we will even implement this method.
-  // int getNid() const;
+  // This method is included only for implementing getCipherInfo and can't be
+  // used to construct an Aead instance.
+  int getNid() const;
   // static const AEAD FromNid(int nid);
 
   static const Aead FromCtx(std::string_view name, const AeadCtxPointer& ctx);
 
+  using AeadNameCallback = std::function<void(std::string_view name)>;
+
+  // Iterates the known ciphers if the underlying implementation
+  // is able to do so.
+  static void ForEach(AeadNameCallback callback);
+
   // Utilities to get various AEADs by type.
 
   static const Aead EMPTY;

src/ncrypto.cpp

@@ -5078,6 +5078,12 @@ std::string_view Aead::getName() const {
   return info_->name;
 }
 
+int Aead::getNid() const {
+  if (!aead_) return 0;
+
+  return info_->nid;
+}
+
 const Aead Aead::FromConstructor(Aead::AeadConstructor construct) {
   return Aead(&aeadIndex.at(construct), construct());
 }
@@ -5162,6 +5168,12 @@ const std::unordered_map<Aead::AeadConstructor, Aead::AeadInfo>
           .mode = EVP_CIPH_STREAM_CIPHER}},
     };
 
+void Aead::ForEach(AeadNameCallback callback) {
+  for (const auto& [_, info] : aeadIndex) {
+    callback(info.name);
+  }
+}
+
 const Aead Aead::EMPTY = Aead();
 const Aead Aead::AES_128_GCM = Aead::FromConstructor(EVP_aead_aes_128_gcm);
 const Aead Aead::AES_192_GCM = Aead::FromConstructor(EVP_aead_aes_192_gcm);