Fix interface of recover_key

programs/eosio-tester/main.cpp

@@ -1059,17 +1059,16 @@ struct callbacks {
       std::memcpy(hash_val, hash.data(), hash.data_size());
    }
 
-   int32_t recover_key( span<const char> digest_span,
+   int32_t recover_key( const void* digest_val,
                         span<const char> sig,
-                        void* pub ) {
-      fc::sha256 digest;
-      std::memcpy(digest.data(), digest_span.data(), digest.data_size());
+                        span<char> pub ) {
+
+      fc::sha256 digest((const char*)digest_val, fc::sha256().data_size());
 
       fc::crypto::signature s;
       fc::datastream<const char*> ds( sig.data(), sig.size() );
       fc::raw::unpack(ds, s);
 
-      // TODO: enforce supported key types
       // EOS_ASSERT(static_cast<unsigned>(s.which()) < db.get<protocol_state_object>().num_supported_key_types,
       //            eosio::chain::unactivated_signature_type,
       //            "Unactivated signature type used during assert_recover_key");
@@ -1082,19 +1081,19 @@ struct callbacks {
 
       // the key types newer than the first 2 may be varible in length
       if (static_cast<unsigned>(s.which()) >= eosio::chain::config::genesis_num_supported_key_types ) {
-         // EOS_ASSERT(pub.size() >= 33, eosio::chain::wasm_execution_error,
-         //           "destination buffer must at least be able to hold an ECC public key");
+         EOS_ASSERT(pub.size() >= 33, eosio::chain::wasm_execution_error,
+                    "destination buffer must at least be able to hold an ECC public key");
 
          auto packed_pubkey = fc::raw::pack(recovered);
-         auto copy_size = packed_pubkey.size();
-         std::memcpy(pub, packed_pubkey.data(), copy_size);
+         auto copy_size = std::min<size_t>(pub.size(), packed_pubkey.size());
+         std::memcpy(pub.data(), packed_pubkey.data(), copy_size);
          return packed_pubkey.size();
       } else {
          // legacy behavior, key types 0 and 1 always pack to 33 bytes.
          // this will do one less copy for those keys while maintaining the rules of
          //    [0..33) dest sizes: assert (asserts in fc::raw::pack)
          //    [33..inf) dest sizes: return packed size (always 33)
-         fc::datastream<char*> out_ds( (char*)pub, static_cast<size_t>(33) );
+         fc::datastream<char*> out_ds( (char*)pub.data(), pub.size() );
          fc::raw::pack(out_ds, recovered);
          return out_ds.tellp();
       }