Function pad7816

src/pq.rs:288–295

ISO/IEC 7816-4 padding to the next multiple of 64, with a minimum floor (itself a multiple of 64). Always appends at least the `0x80` marker.

(plaintext: &mut Vec<u8>, floor: usize)

/// ISO/IEC 7816-4 padding to the next multiple of 64, with a minimum floor
/// (itself a multiple of 64). Always appends at least the `0x80` marker.
pub fn pad7816(plaintext: &mut Vec<u8>, floor: usize) {
    plaintext.push(0x80);
    let mut target = (plaintext.len() + 63) & !63;
    if target < floor {
        target = floor;
    }
    plaintext.resize(target, 0);
}

#[cfg(test)]
mod tests {