feat: reexport signature functions (#248)

make signature functions available

ethabi/src/lib.rs

@@ -71,6 +71,7 @@ pub use crate::{
 	log::{Log, LogFilter, LogParam, ParseLog, RawLog},
 	param::Param,
 	param_type::ParamType,
+	signature::{long_signature, short_signature},
 	state_mutability::StateMutability,
 	token::Token,
 };

ethabi/src/signature.rs

@@ -15,12 +15,14 @@ use crate::{
 	Hash,
 };
 
+/// Returns the first four bytes of the Keccak-256 hash of the signature of the given params
 pub fn short_signature(name: &str, params: &[ParamType]) -> [u8; 4] {
 	let mut result = [0u8; 4];
 	fill_signature(name, params, &mut result);
 	result
 }
 
+/// Returns the full Keccak-256 hash of the signature of the given params
 pub fn long_signature(name: &str, params: &[ParamType]) -> Hash {
 	let mut result = [0u8; 32];
 	fill_signature(name, params, &mut result);