feat: intialize cargo features in post-quantum to use signature schemes based on feature

crates/crypto/post_quantum/Cargo.toml

@@ -9,6 +9,12 @@ repository.workspace = true
 rust-version.workspace = true
 version.workspace = true
 
+[features]
+default = ["signature-scheme-prod"]
+
+signature-scheme-prod = []
+signature-scheme-test = []
+
 [dependencies]
 anyhow.workspace = true
 ethereum_ssz.workspace = true

crates/crypto/post_quantum/src/hashsig/mod.rs

@@ -1,8 +1,11 @@
 pub mod errors;
 pub mod private_key;
 pub mod public_key;
+pub mod scheme;
 pub mod signature;
 
-use hashsig::signature::generalized_xmss::instantiations_poseidon::lifetime_2_to_the_18::winternitz::SIGWinternitzLifetime18W4;
+#[cfg(feature = "signature-scheme-prod")]
+pub type HashSigScheme = hashsig::signature::generalized_xmss::instantiations_poseidon_top_level::lifetime_2_to_the_32::hashing_optimized::SIGTopLevelTargetSumLifetime32Dim64Base8;
 
-pub type HashSigScheme = SIGWinternitzLifetime18W4;
+#[cfg(feature = "signature-scheme-test")]
+pub type HashSigScheme = crate::hashsig::scheme::SIGTopLevelTargetSumLifetime8Dim16Base4;

crates/crypto/post_quantum/src/hashsig/scheme.rs

@@ -0,0 +1,62 @@
+use hashsig::{
+    inc_encoding::target_sum::TargetSumEncoding,
+    signature::generalized_xmss::GeneralizedXMSSSignatureScheme,
+    symmetric::{
+        message_hash::top_level_poseidon::TopLevelPoseidonMessageHash,
+        prf::shake_to_field::ShakePRFtoF, tweak_hash::poseidon::PoseidonTweakHash,
+    },
+};
+
+// TEST_CONFIG signature scheme parameters based on leanSpec configuration
+// Source: https://github.com/leanEthereum/leanSpec/blob/a2bc45b66b1fa8506dfae54f9966563d1e54101c/src/lean_spec/subspecs/xmss/constants.py#L121-L137
+
+const LOG_LIFETIME: usize = 8;
+const DIMENSION: usize = 16;
+const BASE: usize = 4;
+const FINAL_LAYER: usize = 24;
+const TARGET_SUM: usize = 24;
+
+const PARAMETER_LENGTH: usize = 5;
+const TWEAK_LENGTH_FIELD_ELEMENTS: usize = 2;
+const MESSAGE_LENGTH_FIELD_ELEMENTS: usize = 9;
+const RAND_LENGTH_FIELD_ELEMENTS: usize = 7;
+const HASH_LENGTH_FIELD_ELEMENTS: usize = 8;
+
+const CAPACITY: usize = 9;
+
+const POSEIDON_OUTPUT_LENGTH_PER_INVOCATION_FIELD_ELEMENTS: usize = 15;
+const POSEIDON_INVOCATIONS: usize = 1;
+const POSEIDON_OUTPUT_LENGTH_FIELD_ELEMENTS: usize =
+    POSEIDON_OUTPUT_LENGTH_PER_INVOCATION_FIELD_ELEMENTS * POSEIDON_INVOCATIONS;
+
+type MessageHash = TopLevelPoseidonMessageHash<
+    POSEIDON_OUTPUT_LENGTH_PER_INVOCATION_FIELD_ELEMENTS,
+    POSEIDON_INVOCATIONS,
+    POSEIDON_OUTPUT_LENGTH_FIELD_ELEMENTS,
+    DIMENSION,
+    BASE,
+    FINAL_LAYER,
+    TWEAK_LENGTH_FIELD_ELEMENTS,
+    MESSAGE_LENGTH_FIELD_ELEMENTS,
+    PARAMETER_LENGTH,
+    RAND_LENGTH_FIELD_ELEMENTS,
+>;
+type TweakableHash = PoseidonTweakHash<
+    PARAMETER_LENGTH,
+    HASH_LENGTH_FIELD_ELEMENTS,
+    TWEAK_LENGTH_FIELD_ELEMENTS,
+    CAPACITY,
+    DIMENSION,
+>;
+
+#[allow(clippy::upper_case_acronyms)]
+type PseudoRandomFunction = ShakePRFtoF<HASH_LENGTH_FIELD_ELEMENTS>;
+
+type IncomparableEncoding = TargetSumEncoding<MessageHash, TARGET_SUM>;
+
+pub type SIGTopLevelTargetSumLifetime8Dim16Base4 = GeneralizedXMSSSignatureScheme<
+    PseudoRandomFunction,
+    IncomparableEncoding,
+    TweakableHash,
+    LOG_LIFETIME,
+>;