stdlib
modify function signatures to return 32 bytes
#[foreign(sha256)]
-fn sha256(_input : []Field) -> [2]Field {}
+fn sha256(_input : []Field) -> [32]u8 {}
#[foreign(blake2s)]
-fn blake2s(_input : []Field) -> [2]Field {}
+fn blake2s(_input : []Field) -> [32]u8 {}
#[foreign(pedersen)]
fn pedersen(_input : []Field) -> Field {}
