Function solana_core::chacha::chacha_cbc_encrypt_ledger

pub fn chacha_cbc_encrypt_ledger(
    blocktree: &Arc<Blocktree>, 
    start_slot: Slot, 
    slots_per_segment: u64, 
    out_path: &Path, 
    ivec: &mut [u8; 64]
) -> Result<usize>