add the protobuf files from the iden3 repo for reference

protos/README.md

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+
+These protobuf definitions are taken from 
+the [`circom-witnesscalc`](https://github.com/iden3/circom-witnesscalc/tree/main/protos) 
+repository

protos/messages.proto

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+syntax = "proto3";
+
+package circom_witnesscalc.proto;
+
+enum DuoOp {
+    Mul = 0;
+    Div = 1;
+    Add = 2;
+    Sub = 3;
+    Pow = 4;
+    Idiv = 5;
+    Mod = 6;
+    Eq = 7;
+    Neq = 8;
+    Lt = 9;
+    Gt = 10;
+    Leq = 11;
+    Geq = 12;
+    Land = 13;
+    Lor = 14;
+    Shl = 15;
+    Shr = 16;
+    Bor = 17;
+    Band = 18;
+    Bxor = 19;
+}
+
+enum UnoOp {
+    Neg = 0;
+    Id = 1;
+}
+
+enum TresOp {
+    TernCond = 0;
+}
+
+message BigUInt {
+  bytes valueLE = 1;
+}
+
+message InputNode {
+  uint32 idx = 1;
+}
+
+message ConstantNode {
+  BigUInt value = 1;
+}
+
+message UnoOpNode {
+  UnoOp op = 1;
+  uint32 aIdx = 2;
+}
+
+message DuoOpNode {
+  DuoOp op = 1;
+  uint32 aIdx = 2;
+  uint32 bIdx = 3;
+}
+
+message TresOpNode {
+  TresOp op = 1;
+  uint32 aIdx = 2;
+  uint32 bIdx = 3;
+  uint32 cIdx = 4;
+}
+
+message Node {
+  oneof node {
+    InputNode input = 1;
+    ConstantNode constant = 2;
+    UnoOpNode unoOp = 3;
+    DuoOpNode duoOp = 4;
+    TresOpNode tresOp = 5;
+  }
+}
+
+message SignalDescription {
+  uint32 offset = 1;
+  uint32 len = 2;
+}
+
+message GraphMetadata {
+  repeated uint32 witnessSignals = 1;
+  map<string, SignalDescription> inputs = 2;
+}

protos/vm.proto

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+syntax = "proto3";
+
+package circom_witnesscalc.proto.vm;
+
+import "protos/messages.proto";
+
+// Virtual Machine metadata
+message VmMd {
+  uint32 main_template_id = 1;
+  uint32 templates_num = 2;
+  uint32 functions_num = 3;
+  uint32 signals_num = 4;
+  uint32 constants_num = 5;
+  map<string, SignalDescription> inputs = 9;
+  repeated uint32 witness_signals = 7;
+  map<uint32, IoDefs> io_map = 8;
+}
+
+message ComponentTmpl {
+  string symbol = 1;
+  uint64 sub_cmp_idx = 2;
+  uint64 number_of_cmp = 3;
+  string name_subcomponent = 4;
+  uint64 signal_offset = 5;
+  uint64 signal_offset_jump = 6;
+  uint64 template_id = 7;
+  bool has_inputs = 8;
+}
+
+message Template {
+  string name = 1;
+  bytes code = 2;
+  repeated uint64 line_numbers = 3;
+  repeated ComponentTmpl components = 4;
+  uint64 var_stack_depth = 5;
+  uint64 number_of_inputs = 6;
+}
+
+message Function {
+  string name = 1;
+  string symbol = 2;
+  bytes code = 3;
+  repeated uint64 line_numbers = 4;
+}
+
+message IoDef {
+  uint32 code = 1;
+  uint32 offset = 2;
+  repeated uint32 lengths = 3;
+}
+
+message IoDefs {
+  repeated IoDef io_defs = 1;
+}