Method unpad

block-padding/src/lib.rs:168–180

(block: &[u8], strict: bool)

impl Pkcs7 {
    #[inline]
    fn unpad(block: &[u8], strict: bool) -> Result<&[u8], Error> {
        assert!(block.len() <= 255, "block size is too big for PKCS#7");
        let bs = block.len();
        let n = block[bs - 1];
        if n == 0 || n as usize > bs {
            return Err(Error);
        }
        let s = bs - n as usize;
        if strict && block[s..bs - 1].iter().any(|&v| v != n) {
            return Err(Error);
        }
        Ok(&block[..s])
    }
}

impl Padding for Pkcs7 {