diff --git a/crates/crc/src/crc_32.rs b/crates/crc/src/crc_32.rs
index 614daa5..e0e0c3f 100755
--- a/crates/crc/src/crc_32.rs
+++ b/crates/crc/src/crc_32.rs
@@ -44,7 +44,6 @@ pub const CRC32_INIT: u32 = 0xffffffff;
 
 /// Implements CRC-32/ISO-HDLC with look up table
 pub struct Crc32(<Crc32 as Crc>::Checksum);
-impl Crc32 {}
 impl Crc for Crc32 {
     type Input = [u8];
     type Checksum = u32;
@@ -74,10 +73,8 @@ mod tests {
 
     #[test]
     fn test_check() {
-        let mut c = Crc32::new();
-        c.process(&CHECK_DATA);
         // see https://reveng.sourceforge.io/crc-catalogue/17plus.htm#crc.cat-bits.32 for the check
         // value
-        assert_eq!(*c.shift_reg(), 0xCBF43926);
+        assert_eq!(Crc32::checksum(&CHECK_DATA), 0xCBF43926);
     }
 }
diff --git a/crates/crc/src/lib.rs b/crates/crc/src/lib.rs
index e61b73e..cd32044 100755
--- a/crates/crc/src/lib.rs
+++ b/crates/crc/src/lib.rs
@@ -5,7 +5,7 @@
 //! ## Acknowledgements
 //!
 //! Many thanks to the [crc-catalogue](https://reveng.sourceforge.io/crc-catalogue/) for providing
-//! some test vectors.
+//! an overview over the various algorithms with test vectors and examples.
 
 #![cfg_attr(not(test), no_std)]
 
@@ -15,11 +15,16 @@ pub const CHECK_DATA: [u8; 9] = *b"123456789";
 
 pub use crc_32::*;
 
-pub trait Crc {
+pub trait Crc: Sized {
     type Input: ?Sized;
-    type Checksum: Eq + Default;
+    type Checksum: Eq + Default + Copy;
 
     fn new() -> Self;
     fn process(&mut self, data: &Self::Input);
     fn shift_reg(&mut self) -> &mut Self::Checksum;
+    fn checksum(data: &Self::Input) -> Self::Checksum {
+        let mut c = Self::new();
+        c.process(data);
+        *c.shift_reg()
+    }
 }