fn remove_padding()

in aws-lc-rs/src/cipher/padded.rs [42:66]

• 21 lines of code
• 7 McCabe index (conditional complexity)

    fn remove_padding(self, block_len: usize, in_out: &mut [u8]) -> Result<&mut [u8], Unspecified> {
        match self {
            PaddingStrategy::PKCS7 => {
                let block_size: u8 = block_len.try_into().map_err(|_| Unspecified)?;

                if in_out.is_empty() || in_out.len() < block_len {
                    return Err(Unspecified);
                }

                let padding: u8 = in_out[in_out.len() - 1];
                if padding == 0 || padding > block_size {
                    return Err(Unspecified);
                }

                for item in in_out.iter().skip(in_out.len() - padding as usize) {
                    if *item != padding {
                        return Err(Unspecified);
                    }
                }

                let final_len = in_out.len() - padding as usize;
                Ok(&mut in_out[0..final_len])
            }
        }
    }