pbs-tools/src/sha.rs

   1 //! SHA helpers.
   2
   3 use std::io::Read;
   4
   5 use anyhow::Error;
   6
   7 /// Calculate the sha256sum from a readable object.
   8 pub fn sha256(file: &mut dyn Read) -> Result<([u8; 32], u64), Error> {
   9     let mut hasher = openssl::sha::Sha256::new();
  10     let mut buffer = proxmox::tools::vec::undefined(256 * 1024);
  11     let mut size: u64 = 0;
  12
  13     loop {
  14         let count = match file.read(&mut buffer) {
  15             Ok(0) => break,
  16             Ok(count) => count,
  17             Err(ref err) if err.kind() == std::io::ErrorKind::Interrupted => {
  18                 continue;
  19             }
  20             Err(err) => return Err(err.into()),
  21         };
  22         size += count as u64;
  23         hasher.update(&buffer[..count]);
  24     }
  25
  26     let csum = hasher.finish();
  27
  28     Ok((csum, size))
  29 }