Merge pull request zama-ai#80 from zama-ai/fix/64bits

fix: add FheType for Euint64 for kms

README.md

@@ -20,24 +20,25 @@
 
 **fhEVM-go** is an open-source library used to easily integrate the [fhEVM](https://docs.zama.ai/fhevm) into an EVM-compatible blockchain.
 
-
 ## Main features
 
 fhEVM-go gives your EVM the ability to compute on encrypted data using fully homomorphic encryption by:
+
 - a collection of operations on encrypted data via precompiled contracts
 - various additional EVM components that support encrypted computation
 
-
 ## Getting started
 
 In order to use the library, you need to clone the repository and build it. This is required because the library depends on the `tfhe-rs` library that needs to be built from source (for now), and Go doesn't support such a build.
+
 ```bash
 $ git clone https://github.com/zama-ai/fhevm-go
 $ cd fhevm-go
 $ make build
 ```
 
 That's it! You can now use it in your project by adding it to `go.mod`, and adding a `replace` to point to your local build. An example using `fhevm-go` v1.0.0:
+
 ```
 ...
 require(
@@ -57,6 +58,11 @@ replace(
 > [!NOTE]
 > The replace in necessary for now as Go build system can't build the `tfhe-rs` library that `fhevm-go` needs. It's therefore necessary that we build it manually as mentioned above, then point to our ready-to-use directory in `go.mod`.
 
+## Regenerate protobuff files
+
+To re-generate these files, install `protoc`, `protoc-gen-go` and `protoc-gen-go-grpc` and run protoc
+`cd proto && protoc --go_out=../kms --go_opt=paths=source_relative --go-grpc_out=../kms --go-grpc_opt=paths=source_relative kms.proto && cd ..`.
+
 ## Documentation
 
 Full, comprehensive documentation is available at [https://docs.zama.ai/fhevm-go](https://docs.zama.ai/fhevm-go).

fhevm/precompiles.go

@@ -2099,6 +2099,8 @@ func reencryptRun(environment EVMEnvironment, caller common.Address, addr common
 			fheType = kms.FheType_Euint16
 		case FheUint32:
 			fheType = kms.FheType_Euint32
+		case FheUint64:
+			fheType = kms.FheType_Euint64
 		}
 
 		pubKey := input[32:64]
@@ -2230,6 +2232,8 @@ func decryptValue(environment EVMEnvironment, ct *tfheCiphertext) (uint64, error
 		fheType = kms.FheType_Euint16
 	case FheUint32:
 		fheType = kms.FheType_Euint32
+	case FheUint64:
+		fheType = kms.FheType_Euint64
 	}
 
 	// TODO: generate merkle proof for some data

kms/constants.go

@@ -0,0 +1,6 @@
+package kms
+
+import "os"
+
+// URL of the KMS gRPC endpoint
+var KmsEndpointAddr = os.Getenv("KMS_ENDPOINT_ADDR")

proto/kms.proto

@@ -15,6 +15,7 @@ enum FheType {
   Euint8 = 1;
   Euint16 = 2;
   Euint32 = 3;
+  Euint64 = 4;
 }
 
 message Proof {
@@ -32,7 +33,7 @@ message DecryptionRequest {
 message DecryptionResponse {
   bytes signature = 1;
   FheType fhe_type = 2;
-  uint32 plaintext = 3;
+  uint64 plaintext = 3;
 }
 
 message ReencryptionRequest {