feat(hints): Implement NewHint#39

CHANGELOG.md

@@ -2,12 +2,27 @@
 
 #### Upcoming Changes
 
+<<<<<<< HEAD
+* Implement hint on ec_recover.json whitelist [#1037](https://github.com/lambdaclass/cairo-rs/pull/1037):
+=======
 * Implement hint for `starkware.cairo.common.cairo_keccak.keccak.finalize_keccak` as described by whitelist `starknet/security/whitelists/cairo_keccak.json` [#1041](https://github.com/lambdaclass/cairo-rs/pull/1041)
+>>>>>>> 50c90d944bc090578824bb50bed1b1ada5a5fbc0
 
     `BuiltinHintProcessor` now supports the following hint:
 
     ```python
     %{
+<<<<<<< HEAD
+        from starkware.cairo.common.cairo_secp.secp_utils import pack
+        from starkware.python.math_utils import div_mod, safe_div
+
+        a = pack(ids.a, PRIME)
+        b = pack(ids.b, PRIME)
+        product = a * b
+        m = pack(ids.m, PRIME)
+
+        value = res = product % m
+=======
         # Add dummy pairs of input and output.
         _keccak_state_size_felts = int(ids.KECCAK_STATE_SIZE_FELTS)
         _block_size = int(ids.BLOCK_SIZE)
@@ -16,6 +31,7 @@
         inp = [0] * _keccak_state_size_felts
         padding = (inp + keccak_func(inp)) * _block_size
         segments.write_arg(ids.keccak_ptr_end, padding)
+>>>>>>> 50c90d944bc090578824bb50bed1b1ada5a5fbc0
     %}
     ```
 
@@ -52,6 +68,8 @@
     %}
     ```
 
+<<<<<<< HEAD
+=======
 * Implement hints on field_arithmetic lib (Part 2) [#1004](https://github.com/lambdaclass/cairo-rs/pull/1004)
 
     `BuiltinHintProcessor` now supports the following hint:
@@ -110,6 +128,7 @@
         ids.x_inverse_mod_p.high = x_inverse_mod_p_split[1]
     ```
 
+>>>>>>> fb731257da6fc2842abff103fccab964ae87bb38
 * BREAKING CHANGE: Fix `CairoRunner::get_memory_holes` [#1027](https://github.com/lambdaclass/cairo-rs/pull/1027):
 
   * Skip builtin segements when counting memory holes

cairo_programs/ec_recover.cairo

@@ -43,8 +43,33 @@ func test_sub_a_b_hint{range_check_ptr: felt}() {
     return();
 }
 
+func test_product_mod_hint{range_check_ptr: felt}() {
+
+    tempvar a = BigInt3(60, 0, 0);
+    tempvar b = BigInt3(2, 0, 0);
+    tempvar m = BigInt3(100, 0, 0);
+
+    %{
+        from starkware.cairo.common.cairo_secp.secp_utils import pack
+        from starkware.python.math_utils import div_mod, safe_div
+
+        a = pack(ids.a, PRIME)
+        b = pack(ids.b, PRIME)
+        product = a * b
+        m = pack(ids.m, PRIME)
+
+        value = res = product % m
+    %}
+
+    let (res) = nondet_bigint3();
+    assert res = BigInt3(20,0,0);
+
+    return();
+}
+
 func main{range_check_ptr: felt}() {
     test_div_mod_n_packed_hint();
     test_sub_a_b_hint();
+    test_product_mod_hint();
     return();
 }

src/hint_processor/builtin_hint_processor/builtin_hint_processor_definition.rs

@@ -1,5 +1,5 @@
 use super::{
-    ec_recover::{ec_recover_divmod_n_packed, ec_recover_sub_a_b},
+    ec_recover::{ec_recover_divmod_n_packed, ec_recover_product_mod, ec_recover_sub_a_b},
     field_arithmetic::uint384_div,
     vrf::{fq::uint512_unsigned_div_rem, inv_mod_p_uint512::inv_mod_p_uint512},
 };
@@ -603,6 +603,9 @@ impl HintProcessor for BuiltinHintProcessor {
             hint_code::EC_RECOVER_SUB_A_B => {
                 ec_recover_sub_a_b(vm, exec_scopes, &hint_data.ids_data, &hint_data.ap_tracking)
             }
+            hint_code::EC_RECOVER_PRODUCT_MOD => {
+                ec_recover_product_mod(vm, exec_scopes, &hint_data.ids_data, &hint_data.ap_tracking)
+            }
             #[cfg(feature = "skip_next_instruction_hint")]
             hint_code::SKIP_NEXT_INSTRUCTION => skip_next_instruction(vm),
             code => Err(HintError::UnknownHint(code.to_string())),

src/hint_processor/builtin_hint_processor/ec_recover.rs

@@ -63,6 +63,37 @@ pub fn ec_recover_sub_a_b(
     Ok(())
 }
 
+/* Implements Hint:
+%{
+    from starkware.cairo.common.cairo_secp.secp_utils import pack
+    from starkware.python.math_utils import div_mod, safe_div
+
+    a = pack(ids.a, PRIME)
+    b = pack(ids.b, PRIME)
+    product = a * b
+    m = pack(ids.m, PRIME)
+
+    value = res = product % m
+%}
+ */
+pub fn ec_recover_product_mod(
+    vm: &mut VirtualMachine,
+    exec_scopes: &mut ExecutionScopes,
+    ids_data: &HashMap<String, HintReference>,
+    ap_tracking: &ApTracking,
+) -> Result<(), HintError> {
+    let a = bigint3_pack(BigInt3::from_var_name("a", vm, ids_data, ap_tracking)?);
+    let b = bigint3_pack(BigInt3::from_var_name("b", vm, ids_data, ap_tracking)?);
+    let m = bigint3_pack(BigInt3::from_var_name("m", vm, ids_data, ap_tracking)?);
+
+    let product = a * b;
+    exec_scopes.insert_value("product", product.clone());
+    let value = product.mod_floor(&m);
+    exec_scopes.insert_value("value", value.clone());
+    exec_scopes.insert_value("res", value);
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use num_bigint::BigInt;
@@ -157,4 +188,46 @@ mod tests {
             [("value", BigInt::from(75)), ("res", BigInt::from(75))]
         );
     }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn run_ec_recover_product_mod_ok() {
+        let mut vm = vm!();
+        let mut exec_scopes = ExecutionScopes::new();
+
+        vm.run_context.fp = 8;
+        let ids_data = non_continuous_ids_data![("a", -8), ("b", -5), ("m", -2)];
+
+        vm.segments = segments![
+            //a
+            ((1, 0), 60),
+            ((1, 1), 0),
+            ((1, 2), 0),
+            //b
+            ((1, 3), 2),
+            ((1, 4), 0),
+            ((1, 5), 0),
+            //m
+            ((1, 6), 100),
+            ((1, 7), 0),
+            ((1, 8), 0)
+        ];
+
+        assert!(run_hint!(
+            vm,
+            ids_data,
+            hint_code::EC_RECOVER_PRODUCT_MOD,
+            &mut exec_scopes
+        )
+        .is_ok());
+
+        check_scope!(
+            &exec_scopes,
+            [
+                ("value", BigInt::from(20)),
+                ("res", BigInt::from(20)),
+                ("product", BigInt::from(120))
+            ]
+        );
+    }
 }

src/hint_processor/builtin_hint_processor/hint_code.rs

@@ -1035,6 +1035,14 @@ from starkware.python.math_utils import div_mod, safe_div
 a = pack(ids.a, PRIME)
 b = pack(ids.b, PRIME)
 value = res = a - b"#;
+pub const EC_RECOVER_PRODUCT_MOD: &str = r#"from starkware.cairo.common.cairo_secp.secp_utils import pack
+from starkware.python.math_utils import div_mod, safe_div
+
+a = pack(ids.a, PRIME)
+b = pack(ids.b, PRIME)
+product = a * b
+m = pack(ids.m, PRIME)
 
+value = res = product % m"#;
 #[cfg(feature = "skip_next_instruction_hint")]
 pub const SKIP_NEXT_INSTRUCTION: &str = "skip_next_instruction()";