Add support for compile time FIELD_ELEMENTS_PER_BLOB

beacon_node/Cargo.toml

@@ -20,6 +20,7 @@ withdrawals-processing = [
     "execution_layer/withdrawals-processing",
     "http_api/withdrawals-processing",
 ]
+spec-minimal = ["beacon_chain/spec-minimal"]
 
 [dependencies]
 eth2_config = { path = "../common/eth2_config" }

beacon_node/beacon_chain/Cargo.toml

@@ -17,6 +17,7 @@ withdrawals-processing = [
     "execution_layer/withdrawals-processing",
     "operation_pool/withdrawals-processing"
 ]
+spec-minimal = ["kzg/minimal-spec"]
 
 [dev-dependencies]
 maplit = "1.0.2"

beacon_node/beacon_chain/src/kzg_utils.rs

@@ -1,13 +1,12 @@
-use kzg::{Error as KzgError, Kzg};
+use kzg::{Error as KzgError, Kzg, BYTES_PER_BLOB};
 use types::{Blob, BlobsSidecar, EthSpec, Hash256, KzgCommitment, KzgProof, Slot};
 
-// TODO(pawan): make this generic over blob size
+fn ssz_blob_to_crypto_blob<T: EthSpec>(blob: Blob<T>) -> Option<[u8; BYTES_PER_BLOB]> {
-fn ssz_blob_to_crypto_blob<T: EthSpec>(blob: Blob<T>) -> Option<[u8; 131072]> {
+    if blob.len() != BYTES_PER_BLOB {
-    if blob.len() != 131072 {
         return None;
     }
     let blob_vec: Vec<u8> = blob.into();
-    let mut arr = [0; 131072];
+    let mut arr = [0; BYTES_PER_BLOB];
     arr.copy_from_slice(&blob_vec);
     Some(arr)
 }

crypto/kzg/Cargo.toml

@@ -18,5 +18,9 @@ eth2_serde_utils = "0.1.1"
 hex = "0.4.2"
 eth2_hashing = "0.3.0"
 ethereum-types = "0.12.1"
-c-kzg = {git = "https://github.com/pawanjay176/c-kzg-4844", rev = "669a13800a8a0d094c5387db58e06936ef194a25" }
+c-kzg = {git = "https://github.com/pawanjay176/c-kzg-4844", rev = "48c048b12a7d29ae3e7bf09000e07870da4cb701" }
 
+[features]
+default = ["mainnet-spec"]
+mainnet-spec = ["c-kzg/mainnet-spec"]
+minimal-spec = ["c-kzg/minimal-spec"]

crypto/kzg/src/lib.rs

@@ -3,11 +3,12 @@ mod kzg_proof;
 
 pub use crate::{kzg_commitment::KzgCommitment, kzg_proof::KzgProof};
 pub use c_kzg::bytes_to_g1;
-use c_kzg::{Error as CKzgError, KZGSettings, BYTES_PER_FIELD_ELEMENT, FIELD_ELEMENTS_PER_BLOB};
+pub use c_kzg::{
+    Error as CKzgError, KZGSettings, BYTES_PER_BLOB, BYTES_PER_FIELD_ELEMENT,
+    FIELD_ELEMENTS_PER_BLOB,
+};
 use std::path::PathBuf;
 
-const BYTES_PER_BLOB: usize = FIELD_ELEMENTS_PER_BLOB * BYTES_PER_FIELD_ELEMENT;
-
 /// The consensus type `Blob` is generic over EthSpec, so it cannot be imported
 /// in this crate without creating a cyclic dependency between the kzg and consensus/types crates.
 /// So need to use a Vec here unless we think of a smarter way of doing this
@@ -32,7 +33,7 @@ pub struct Kzg {
 impl Kzg {
     pub fn new_from_file(file_path: PathBuf) -> Result<Self, Error> {
         Ok(Self {
-            trusted_setup: KZGSettings::load_trusted_setup(file_path)
+            trusted_setup: KZGSettings::load_trusted_setup_file(file_path)
                 .map_err(Error::InvalidTrustedSetup)?,
         })
     }

lighthouse/Cargo.toml

@@ -17,7 +17,7 @@ modern = ["bls/supranational-force-adx"]
 # Uses the slower Milagro BLS library, which is written in native Rust.
 milagro = ["bls/milagro"]
 # Support minimal spec (used for testing only).
-spec-minimal = []
+spec-minimal = ["beacon_node/spec-minimal"]
 # Support Gnosis spec and Gnosis Beacon Chain.
 gnosis = []
 # Support slasher MDBX backend.