initial commit - bench sig aggregation

benchmarks/bench_bls_sig_agggregation.nim

@@ -0,0 +1,36 @@
+import
+  ./bench_common,
+  ../src/scheme1,
+  nimcrypto, endians
+
+func attestation_signed_data(
+    fork_version: int,
+    slot: int64,
+    shard_id: int16,
+    parent_hashes: seq[array[32, byte]],
+    shard_block_hash: array[32, byte],
+    justified_slot: int64
+  ): MDigest[256]=
+
+  var ctx: blake2_512
+  ctx.init()
+
+  var be_slot: array[8, byte]
+  bigEndian64(be_slot[0].addr, slot.unsafeAddr)
+  ctx.update be_slot
+
+  let size_p_hashes = uint parent_hashes.len * sizeof(array[32, byte])
+  ctx.update(cast[ptr byte](parent_hashes[0].unsafeAddr), size_p_hashes)
+
+  var be_shard_id: array[2, byte]
+  bigEndian16(be_shard_id.addr, shard_id.unsafeAddr)
+  ctx.update be_shard_id
+
+  ctx.update shard_block_hash
+
+  var be_justified_slot: array[8, byte]
+  bigEndian64(be_justified_slot[0].addr, justified_slot.unsafeAddr)
+  ctx.update be_justified_slot
+
+  result.data[0 ..< 32] = ctx.finish().data.toOpenArray(0, 31)
+  ctx.clear()