30 lines
758 B
Rust
30 lines
758 B
Rust
//! SHA helpers.
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use std::io::Read;
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use anyhow::Error;
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/// Calculate the sha256sum from a readable object.
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pub fn sha256(file: &mut dyn Read) -> Result<([u8; 32], u64), Error> {
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let mut hasher = openssl::sha::Sha256::new();
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let mut buffer = proxmox::tools::vec::undefined(256 * 1024);
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let mut size: u64 = 0;
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loop {
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let count = match file.read(&mut buffer) {
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Ok(0) => break,
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Ok(count) => count,
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Err(ref err) if err.kind() == std::io::ErrorKind::Interrupted => {
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continue;
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}
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Err(err) => return Err(err.into()),
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};
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size += count as u64;
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hasher.update(&buffer[..count]);
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}
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let csum = hasher.finish();
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Ok((csum, size))
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}
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