feat!: update aes128_encrypt to return an array

.github/workflows/reports.yml

@@ -299,7 +299,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - project: { repo: AztecProtocol/aztec-packages, path: noir-projects/noir-contracts, is_library: true }
+          # - project: { repo: AztecProtocol/aztec-packages, path: noir-projects/noir-contracts, is_library: true }
           - project: { repo: AztecProtocol/aztec-packages, path: noir-projects/noir-protocol-circuits/crates/private-kernel-inner, take_average: true }
           - project: { repo: AztecProtocol/aztec-packages, path: noir-projects/noir-protocol-circuits/crates/private-kernel-tail, take_average: true  }
           - project: { repo: AztecProtocol/aztec-packages, path: noir-projects/noir-protocol-circuits/crates/private-kernel-reset, take_average: true }

compiler/noirc_evaluator/src/acir/acir_variable.rs

@@ -1421,7 +1421,7 @@ impl<F: AcirField, B: BlackBoxFunctionSolver<F>> AcirContext<F, B> {
                     }
                 }?;
                 output_count = input_size + (16 - input_size % 16);
-                (vec![], vec![F::from(output_count as u128)])
+                (vec![], vec![])
             }
             BlackBoxFunc::RecursiveAggregation => {
                 let proof_type_var = match inputs.pop() {

compiler/noirc_evaluator/src/brillig/brillig_gen/brillig_black_box.rs

@@ -355,15 +355,14 @@ pub(crate) fn convert_black_box_call<F: AcirField + DebugToString, Registers: Re
         BlackBoxFunc::AES128Encrypt => {
             if let (
                 [inputs, BrilligVariable::BrilligArray(iv), BrilligVariable::BrilligArray(key)],
-                [BrilligVariable::SingleAddr(out_len), BrilligVariable::BrilligVector(outputs)],
+                [outputs],
             ) = (function_arguments, function_results)
             {
                 let inputs = convert_array_or_vector(brillig_context, *inputs, bb_func);
                 let iv = brillig_context.codegen_brillig_array_to_heap_array(*iv);
                 let key = brillig_context.codegen_brillig_array_to_heap_array(*key);
 
-                let outputs_vector =
-                    brillig_context.codegen_brillig_vector_to_heap_vector(*outputs);
+                let outputs_vector = convert_array_or_vector(brillig_context, *outputs, bb_func);
 
                 brillig_context.black_box_op_instruction(BlackBoxOp::AES128Encrypt {
                     inputs,
@@ -372,11 +371,6 @@ pub(crate) fn convert_black_box_call<F: AcirField + DebugToString, Registers: Re
                     outputs: outputs_vector,
                 });
 
-                brillig_context.mov_instruction(out_len.address, outputs_vector.size);
-                // Returns slice, so we need to allocate memory for it after the fact
-
-                brillig_context.initialize_externally_returned_vector(*outputs, outputs_vector);
-
                 brillig_context.deallocate_heap_vector(inputs);
                 brillig_context.deallocate_heap_vector(outputs_vector);
                 brillig_context.deallocate_heap_array(iv);

noir_stdlib/src/aes128.nr

@@ -1,4 +1,8 @@
 #[foreign(aes128_encrypt)]
 // docs:start:aes128
-pub fn aes128_encrypt<let N: u32>(input: [u8; N], iv: [u8; 16], key: [u8; 16]) -> [u8] {}
+pub fn aes128_encrypt<let N: u32>(
+    input: [u8; N],
+    iv: [u8; 16],
+    key: [u8; 16],
+) -> [u8; N + 16 - N % 16] {}
 // docs:end:aes128

test_programs/execution_success/aes128_encrypt/src/main.nr

@@ -22,12 +22,12 @@ unconstrained fn decode_hex<let N: u32, let M: u32>(s: str<N>) -> [u8; M] {
 
 unconstrained fn cipher(plaintext: [u8; 12], iv: [u8; 16], key: [u8; 16]) -> [u8; 16] {
     let result = std::aes128::aes128_encrypt(plaintext, iv, key);
-    result.as_array()
+    result
 }
 
 fn main(inputs: str<12>, iv: str<16>, key: str<16>, output: str<32>) {
     let result: [u8; 16] =
-        std::aes128::aes128_encrypt(inputs.as_bytes(), iv.as_bytes(), key.as_bytes()).as_array();
+        std::aes128::aes128_encrypt(inputs.as_bytes(), iv.as_bytes(), key.as_bytes());
 
     let output_bytes: [u8; 16] = unsafe {
         //@safety: testing context