[Feature] Domain separators (#1105)

* Create domain separator in function in wasm

* Give domain separator camelCase name

* Add Record Scanner domain separator to SDK constants

Author: iamalwaysuncomfortable

sdk/src/browser.ts

@@ -127,6 +127,7 @@ export {
     PUBLIC_TRANSFER,
     PUBLIC_TRANSFER_AS_SIGNER,
     PUBLIC_TO_PRIVATE_TRANSFER,
+    RECORD_DOMAIN,
     VALID_TRANSFER_TYPES,
 } from "./constants.js";
 

sdk/src/constants.ts

@@ -111,3 +111,5 @@ export const PUBLIC_TO_PRIVATE_TRANSFER = new Set([
     "transfer_public_to_private",
     "transferPublicToPrivate",
 ]);
+
+export const RECORD_DOMAIN = "RecordScannerV0";

wasm/src/types/field.rs

@@ -18,10 +18,10 @@ use crate::{
     Plaintext,
     from_js_typed_array,
     to_bits_array_le,
-    types::native::{FieldNative, LiteralNative, PlaintextNative},
+    types::native::{CurrentNetwork, FieldNative, LiteralNative, PlaintextNative},
 };
-use snarkvm_console::prelude::{Double, FromBits, FromBytes, One, Pow, ToBits, ToBytes, Zero};
-use snarkvm_wasm::utilities::Uniform;
+use snarkvm_console::prelude::{Double, Environment, FromBits, FromBytes, One, Pow, ToBits, ToBytes, Zero};
+use snarkvm_wasm::{fields::PrimeField, utilities::Uniform};
 
 use js_sys::{Array, Uint8Array};
 use std::{ops::Deref, str::FromStr, sync::OnceLock};
@@ -115,6 +115,14 @@ impl Field {
         Field(self.0 / other.0)
     }
 
+    /// Initializes a new field as a domain separator.
+    #[wasm_bindgen(js_name = "newDomainSeparator")]
+    pub fn new_domain_separator(&self, domain: &str) -> Field {
+        let domain_native =
+            FieldNative::new(<CurrentNetwork as Environment>::Field::from_bytes_le_mod_order(domain.as_bytes()));
+        Field::from(domain_native)
+    }
+
     /// Power of a field element.
     pub fn pow(&self, other: &Field) -> Field {
         Field(self.0.pow(other.0))