monero: match monero's stricter check when decompressing points (#515)

* monero: match monero's stricter check when decompressing points

* Reverted type change for output key

Cargo.lock

@@ -4348,6 +4348,7 @@ dependencies = [
  "curve25519-dalek",
  "dalek-ff-group",
  "group",
+ "hex",
  "sha3",
  "std-shims",
  "subtle",

coins/monero/generators/Cargo.toml

@@ -26,6 +26,9 @@ curve25519-dalek = { version = "4", default-features = false, features = ["alloc
 group = { version = "0.13", default-features = false }
 dalek-ff-group = { path = "../../../crypto/dalek-ff-group", version = "0.4", default-features = false }
 
+[dev-dependencies]
+hex = "0.4"
+
 [features]
 std = ["std-shims/std", "subtle/std", "sha3/std", "dalek-ff-group/std"]
 default = ["std"]

coins/monero/generators/src/hash_to_point.rs

@@ -7,7 +7,16 @@ use dalek_ff_group::FieldElement;
 
 use crate::hash;
 
-/// Monero's hash to point function, as named `ge_fromfe_frombytes_vartime`.
+/// Decompress canonically encoded ed25519 point
+/// It does not check if the point is in the prime order subgroup
+pub fn decompress_point(bytes: [u8; 32]) -> Option<EdwardsPoint> {
+  CompressedEdwardsY(bytes)
+    .decompress()
+    // Ban points which are either unreduced or -0
+    .filter(|point| point.compress().to_bytes() == bytes)
+}
+
+/// Monero's hash to point function, as named `hash_to_ec`.
 pub fn hash_to_point(bytes: [u8; 32]) -> EdwardsPoint {
   #[allow(non_snake_case)]
   let A = FieldElement::from(486662u64);
@@ -47,5 +56,5 @@ pub fn hash_to_point(bytes: [u8; 32]) -> EdwardsPoint {
   let mut bytes = Y.to_repr();
   bytes[31] |= sign.unwrap_u8() << 7;
 
-  CompressedEdwardsY(bytes).decompress().unwrap().mul_by_cofactor()
+  decompress_point(bytes).unwrap().mul_by_cofactor()
 }

coins/monero/generators/src/lib.rs

@@ -9,7 +9,7 @@ use std_shims::{sync::OnceLock, vec::Vec};
 
 use sha3::{Digest, Keccak256};
 
-use curve25519_dalek::edwards::{EdwardsPoint as DalekPoint, CompressedEdwardsY};
+use curve25519_dalek::edwards::{EdwardsPoint as DalekPoint};
 
 use group::{Group, GroupEncoding};
 use dalek_ff_group::EdwardsPoint;
@@ -18,7 +18,10 @@ mod varint;
 use varint::write_varint;
 
 mod hash_to_point;
-pub use hash_to_point::hash_to_point;
+pub use hash_to_point::{hash_to_point, decompress_point};
+
+#[cfg(test)]
+mod tests;
 
 fn hash(data: &[u8]) -> [u8; 32] {
   Keccak256::digest(data).into()
@@ -29,10 +32,7 @@ static H_CELL: OnceLock<DalekPoint> = OnceLock::new();
 #[allow(non_snake_case)]
 pub fn H() -> DalekPoint {
   *H_CELL.get_or_init(|| {
-    CompressedEdwardsY(hash(&EdwardsPoint::generator().to_bytes()))
-      .decompress()
-      .unwrap()
-      .mul_by_cofactor()
+    decompress_point(hash(&EdwardsPoint::generator().to_bytes())).unwrap().mul_by_cofactor()
   })
 }
 

coins/monero/generators/src/tests/hash_to_point.rs

@@ -0,0 +1,38 @@
+use crate::{decompress_point, hash_to_point};
+
+#[test]
+fn crypto_tests() {
+  // tests.txt file copied from monero repo
+  // https://github.com/monero-project/monero/
+  //   blob/ac02af92867590ca80b2779a7bbeafa99ff94dcb/tests/crypto/tests.txt
+  let reader = include_str!("./tests.txt");
+
+  for line in reader.lines() {
+    let mut words = line.split_whitespace();
+    let command = words.next().unwrap();
+
+    match command {
+      "check_key" => {
+        let key = words.next().unwrap();
+        let expected = match words.next().unwrap() {
+          "true" => true,
+          "false" => false,
+          _ => unreachable!("invalid result"),
+        };
+
+        let actual = decompress_point(hex::decode(key).unwrap().try_into().unwrap());
+
+        assert_eq!(actual.is_some(), expected);
+      }
+      "hash_to_ec" => {
+        let bytes = words.next().unwrap();
+        let expected = words.next().unwrap();
+
+        let actual = hash_to_point(hex::decode(bytes).unwrap().try_into().unwrap());
+
+        assert_eq!(hex::encode(actual.compress().to_bytes()), expected);
+      }
+      _ => unreachable!("unknown command"),
+    }
+  }
+}

coins/monero/generators/src/tests/mod.rs

@@ -0,0 +1 @@
+mod hash_to_point;

coins/monero/generators/src/tests/tests.txt

@@ -0,0 +1,628 @@
+check_key c2cb3cf3840aa9893e00ec77093d3d44dba7da840b51c48462072d58d8efd183 false
+check_key bd85a61bae0c101d826cbed54b1290f941d26e70607a07fc6f0ad611eb8f70a6 true
+check_key 328f81cad4eba24ab2bad7c0e56b1e2e7346e625bcb06ae649aef3ffa0b8bef3 false
+check_key 6016a5463b9e5a58c3410d3f892b76278883473c3f0b69459172d3de49e85abe true
+check_key 4c71282b2add07cdc6898a2622553f1ca4eb851e5cb121181628be5f3814c5b1 false
+check_key 69393c25c3b50e177f81f20f852dd604e768eb30052e23108b3cfa1a73f2736e true
+check_key 3d5a89b676cb84c2be3428d20a660dc6a37cae13912e127888a5132e8bac2163 true
+check_key 78cd665deb28cebc6208f307734c56fccdf5fa7e2933fadfcdd2b6246e9ae95c false
+check_key e03b2414e260580f86ee294cd4c636a5b153e617f704e81dad248fbf715b2ee4 true
+check_key 28c3503ce82d7cdc8e0d96c4553bcf0352bbcfc73925495dbe541e7e1df105fc false
+check_key 06855c3c3e0d03fec354059bda319b39916bdc10b6581e3f41b335ee7b014fd5 false
+check_key 556381485df0d7d5a268ab5ecfb2984b060acc63471183fcf538bf273b0c0cb5 true
+check_key c7f76d82ac64b1e7fdc32761ff00d6f0f7ada4cf223aa5a11187e3a02e1d5319 true
+check_key cfa85d8bdb6f633fcf031adee3a299ac42eeb6bd707744049f652f6322f5aa47 true
+check_key 91e9b63ced2b08979fee713365464cc3417c4f238f9bdd3396efbb3c58e195ee true
+check_key 7b56e76fe94bd30b3b2f2c4ba5fe4c504821753a8965eb1cbcf8896e2d6aba19 true
+check_key 7338df494bc416cf5edcc02069e067f39cb269ce67bd9faba956021ce3b3de3a false
+check_key f9a1f27b1618342a558379f4815fa5039a8fe9d98a09f45c1af857ba99231dc1 false
+check_key b2a1f37718180d4448a7fcb5f788048b1a7132dde1cfd25f0b9b01776a21c687 true
+check_key 0d3a0f9443a8b24510ad1e76a8117cca03bce416edfe35e3c2a2c2712454f8dc false
+check_key d8d3d806a76f120c4027dc9c9d741ad32e06861b9cfbc4ce39289c04e251bb3c false
+check_key 1e9e3ba7bc536cd113606842835d1f05b4b9e65875742f3a35bfb2d63164b5d5 true
+check_key 5c52d0087997a2cdf1d01ed0560d94b4bfd328cb741cb9a8d46ff50374b35a57 true
+check_key bb669d4d7ffc4b91a14defedcdbd96b330108b01adc63aa685e2165284c0033b false
+check_key d2709ae751a0a6fd796c98456fa95a7b64b75a3434f1caa3496eeaf5c14109b4 true
+check_key e0c238cba781684e655b10a7d4af04ab7ff2e7022182d7ed2279d6adf36b3e7a false
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+check_key d42cf7fdf5e17e0a8a7f88505a2b7a3d297113bd93d3c20fa87e11509ec905a2 true
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coins/monero/src/bin/reserialize_chain.rs

@@ -2,10 +2,7 @@
 mod binaries {
   pub(crate) use std::sync::Arc;
 
-  pub(crate) use curve25519_dalek::{
-    scalar::Scalar,
-    edwards::{CompressedEdwardsY, EdwardsPoint},
-  };
+  pub(crate) use curve25519_dalek::{scalar::Scalar, edwards::EdwardsPoint};
 
   pub(crate) use multiexp::BatchVerifier;
 
@@ -20,6 +17,8 @@ mod binaries {
     rpc::{RpcError, Rpc, HttpRpc},
   };
 
+  pub(crate) use monero_generators::decompress_point;
+
   pub(crate) use tokio::task::JoinHandle;
 
   pub(crate) async fn check_block(rpc: Arc<Rpc<HttpRpc>>, block_i: usize) {
@@ -201,13 +200,12 @@ mod binaries {
                 };
 
                 let rpc_point = |point: &str| {
-                  CompressedEdwardsY(
+                  decompress_point(
                     hex::decode(point)
                       .expect("invalid hex for ring member")
                       .try_into()
                       .expect("invalid point len for ring member"),
                   )
-                  .decompress()
                   .expect("invalid point for ring member")
                 };
 

coins/monero/src/lib.rs

@@ -16,7 +16,7 @@ use sha3::{Digest, Keccak256};
 
 use curve25519_dalek::{constants::ED25519_BASEPOINT_TABLE, scalar::Scalar, edwards::EdwardsPoint};
 
-pub use monero_generators::H;
+pub use monero_generators::{H, decompress_point};
 
 mod merkle;
 

coins/monero/src/rpc/mod.rs

@@ -9,7 +9,9 @@ use std_shims::{
 
 use async_trait::async_trait;
 
-use curve25519_dalek::edwards::{EdwardsPoint, CompressedEdwardsY};
+use curve25519_dalek::edwards::EdwardsPoint;
+
+use monero_generators::decompress_point;
 
 use serde::{Serialize, Deserialize, de::DeserializeOwned};
 use serde_json::{Value, json};
@@ -86,10 +88,9 @@ fn hash_hex(hash: &str) -> Result<[u8; 32], RpcError> {
 }
 
 fn rpc_point(point: &str) -> Result<EdwardsPoint, RpcError> {
-  CompressedEdwardsY(
+  decompress_point(
     rpc_hex(point)?.try_into().map_err(|_| RpcError::InvalidPoint(point.to_string()))?,
   )
-  .decompress()
   .ok_or_else(|| RpcError::InvalidPoint(point.to_string()))
 }
 
@@ -585,12 +586,11 @@ impl<R: RpcConnection> Rpc<R> {
         // Only valid keys can be used in CLSAG proofs, hence the need for re-selection, yet
         // invalid keys may honestly exist on the blockchain
         // Only a recent hard fork checked output keys were valid points
-        let Some(key) = CompressedEdwardsY(
+        let Some(key) = decompress_point(
           rpc_hex(&out.key)?
             .try_into()
             .map_err(|_| RpcError::InvalidNode("non-32-byte point".to_string()))?,
-        )
-        .decompress() else {
+        ) else {
           return Ok(None);
         };
         Ok(

coins/monero/src/serialize.rs

@@ -4,10 +4,9 @@ use std_shims::{
   io::{self, Read, Write},
 };
 
-use curve25519_dalek::{
-  scalar::Scalar,
-  edwards::{EdwardsPoint, CompressedEdwardsY},
-};
+use curve25519_dalek::{scalar::Scalar, edwards::EdwardsPoint};
+
+use monero_generators::decompress_point;
 
 const VARINT_CONTINUATION_MASK: u8 = 0b1000_0000;
 
@@ -136,11 +135,7 @@ pub(crate) fn read_scalar<R: Read>(r: &mut R) -> io::Result<Scalar> {
 
 pub(crate) fn read_point<R: Read>(r: &mut R) -> io::Result<EdwardsPoint> {
   let bytes = read_bytes(r)?;
-  CompressedEdwardsY(bytes)
-    .decompress()
-    // Ban points which are either unreduced or -0
-    .filter(|point| point.compress().to_bytes() == bytes)
-    .ok_or_else(|| io::Error::other("invalid point"))
+  decompress_point(bytes).ok_or_else(|| io::Error::other("invalid point"))
 }
 
 pub(crate) fn read_torsion_free_point<R: Read>(r: &mut R) -> io::Result<EdwardsPoint> {

coins/monero/src/tests/address.rs

@@ -2,7 +2,9 @@ use hex_literal::hex;
 
 use rand_core::{RngCore, OsRng};
 
-use curve25519_dalek::{constants::ED25519_BASEPOINT_TABLE, edwards::CompressedEdwardsY};
+use curve25519_dalek::constants::ED25519_BASEPOINT_TABLE;
+
+use monero_generators::decompress_point;
 
 use crate::{
   random_scalar,
@@ -142,14 +144,8 @@ fn featured_vectors() {
       }
       _ => panic!("Unknown network"),
     };
-    let spend = CompressedEdwardsY::from_slice(&hex::decode(vector.spend).unwrap())
-      .unwrap()
-      .decompress()
-      .unwrap();
-    let view = CompressedEdwardsY::from_slice(&hex::decode(vector.view).unwrap())
-      .unwrap()
-      .decompress()
-      .unwrap();
+    let spend = decompress_point(hex::decode(vector.spend).unwrap().try_into().unwrap()).unwrap();
+    let view = decompress_point(hex::decode(vector.view).unwrap().try_into().unwrap()).unwrap();
 
     let addr = MoneroAddress::from_str(network, &vector.address).unwrap();
     assert_eq!(addr.spend, spend);

coins/monero/src/tests/bulletproofs/mod.rs

@@ -1,7 +1,8 @@
 use hex_literal::hex;
 use rand_core::OsRng;
 
-use curve25519_dalek::{scalar::Scalar, edwards::CompressedEdwardsY};
+use curve25519_dalek::scalar::Scalar;
+use monero_generators::decompress_point;
 use multiexp::BatchVerifier;
 
 use crate::{
@@ -14,7 +15,7 @@ mod plus;
 #[test]
 fn bulletproofs_vector() {
   let scalar = |scalar| Scalar::from_canonical_bytes(scalar).unwrap();
-  let point = |point| CompressedEdwardsY(point).decompress().unwrap();
+  let point = |point| decompress_point(point).unwrap();
 
   // Generated from Monero
   assert!(Bulletproofs::Original(OriginalStruct {

coins/monero/src/wallet/address.rs

@@ -3,7 +3,9 @@ use std_shims::string::{String, ToString};
 
 use zeroize::Zeroize;
 
-use curve25519_dalek::edwards::{EdwardsPoint, CompressedEdwardsY};
+use curve25519_dalek::edwards::EdwardsPoint;
+
+use monero_generators::decompress_point;
 
 use base58_monero::base58::{encode_check, decode_check};
 
@@ -240,12 +242,10 @@ impl<B: AddressBytes> Address<B> {
     }
 
     let mut meta = AddressMeta::from_byte(raw[0])?;
-    let spend = CompressedEdwardsY(raw[1 .. 33].try_into().unwrap())
-      .decompress()
-      .ok_or(AddressError::InvalidKey)?;
-    let view = CompressedEdwardsY(raw[33 .. 65].try_into().unwrap())
-      .decompress()
-      .ok_or(AddressError::InvalidKey)?;
+    let spend =
+      decompress_point(raw[1 .. 33].try_into().unwrap()).ok_or(AddressError::InvalidKey)?;
+    let view =
+      decompress_point(raw[33 .. 65].try_into().unwrap()).ok_or(AddressError::InvalidKey)?;
     let mut read = 65;
 
     if matches!(meta.kind, AddressType::Featured { .. }) {

coins/monero/src/wallet/scan.rs

@@ -9,6 +9,8 @@ use zeroize::{Zeroize, ZeroizeOnDrop};
 
 use curve25519_dalek::{constants::ED25519_BASEPOINT_TABLE, scalar::Scalar, edwards::EdwardsPoint};
 
+use monero_generators::decompress_point;
+
 use crate::{
   Commitment,
   serialize::{read_byte, read_u32, read_u64, read_bytes, read_scalar, read_point, read_raw_vec},
@@ -349,7 +351,7 @@ impl Scanner {
         }
       }
 
-      let output_key = output.key.decompress();
+      let output_key = decompress_point(output.key.to_bytes());
       if output_key.is_none() {
         continue;
       }

tests/full-stack/src/tests/mint_and_burn.rs

@@ -336,9 +336,7 @@ async fn mint_and_burn_test() {
 
     // Send in XMR
     {
-      use curve25519_dalek::{
-        constants::ED25519_BASEPOINT_POINT, scalar::Scalar, edwards::CompressedEdwardsY,
-      };
+      use curve25519_dalek::{constants::ED25519_BASEPOINT_POINT, scalar::Scalar};
       use monero_serai::{
         Protocol,
         transaction::Timelock,
@@ -346,6 +344,7 @@ async fn mint_and_burn_test() {
           ViewPair, Scanner, Decoys, Change, FeePriority, SignableTransaction,
           address::{Network, AddressType, AddressMeta, MoneroAddress},
         },
+        decompress_point,
       };
 
       // Grab the first output on the chain
@@ -382,9 +381,7 @@ async fn mint_and_burn_test() {
               Network::Mainnet,
               AddressType::Featured { guaranteed: true, subaddress: false, payment_id: None },
             ),
-            CompressedEdwardsY(monero_key_pair.1.to_vec().try_into().unwrap())
-              .decompress()
-              .unwrap(),
+            decompress_point(monero_key_pair.1.to_vec().try_into().unwrap()).unwrap(),
             ED25519_BASEPOINT_POINT *
               processor::additional_key::<processor::networks::monero::Monero>(0).0,
           ),

tests/processor/src/networks.rs

@@ -283,7 +283,7 @@ impl Wallet {
       }
 
       Wallet::Monero { handle, ref spend_key, ref view_pair, ref mut inputs } => {
-        use curve25519_dalek::{constants::ED25519_BASEPOINT_POINT, edwards::CompressedEdwardsY};
+        use curve25519_dalek::constants::ED25519_BASEPOINT_POINT;
         use monero_serai::{
           Protocol,
           wallet::{
@@ -291,6 +291,7 @@ impl Wallet {
             SpendableOutput, Decoys, Change, FeePriority, Scanner, SignableTransaction,
           },
           rpc::HttpRpc,
+          decompress_point,
         };
         use processor::{additional_key, networks::Monero};
 
@@ -317,8 +318,7 @@ impl Wallet {
         .await
         .unwrap();
 
-        let to_spend_key =
-          CompressedEdwardsY(<[u8; 32]>::try_from(to.as_ref()).unwrap()).decompress().unwrap();
+        let to_spend_key = decompress_point(<[u8; 32]>::try_from(to.as_ref()).unwrap()).unwrap();
         let to_view_key = additional_key::<Monero>(0);
         let to_addr = Address::new(
           AddressMeta::new(