b3sum

https://docs.rs/b3sum/latest/b3sum/

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b3sum is a command-line utility for calculating BLAKE3 hashes, similar to Coreutils tools like b2sum...

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### Install b3sum

Source: https://docs.rs/b3sum/latest/b3sum

Commands to install or build the b3sum utility using Cargo.

```bash
cargo install b3sum
```

```bash
cargo install --path .
```

```bash
cargo build --release
```

--------------------------------

### View b3sum CLI usage

Source: https://docs.rs/b3sum/latest/b3sum

Displays the command-line interface options and arguments for b3sum.

```text
Usage: b3sum [OPTIONS] [FILE]...

Arguments:
  [FILE]...  Files to hash, or checkfiles to check

Options:
      --keyed                 Use the keyed mode, reading the 32-byte key from stdin
      --derive-key <CONTEXT>  Use the key derivation mode, with the given context string
  -l, --length <LEN>          The number of output bytes, before hex encoding [default: 32]
      --seek <SEEK>           The starting output byte offset, before hex encoding [default: 0]
      --num-threads <NUM>     The maximum number of threads to use
      --no-mmap               Disable memory mapping
      --no-names              Omit filenames in the output
      --raw                   Write raw output bytes to stdout, rather than hex
      --tag                   Output BSD-style checksums: BLAKE3 ([FILE]) = [HASH]
  -c, --check                 Read BLAKE3 sums from the [FILE]s and check them
      --quiet                 Skip printing OK for each checked file
  -h, --help                  Print help (see more with '--help')
  -V, --version               Print version
```

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### Benchmark hashing performance

Source: https://docs.rs/b3sum/latest/b3sum

Compares the performance of SHA-256 and BLAKE3 by hashing a 1 GB file.

```bash
# Create a 1 GB file.
head -c 1000000000 /dev/zero > /tmp/bigfile
# Hash it with SHA-256.
time openssl sha256 /tmp/bigfile
# Hash it with BLAKE3.
time b3sum /tmp/bigfile
```

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### Hash a file

Source: https://docs.rs/b3sum/latest/b3sum

Calculates the BLAKE3 hash of a specific file.

```bash
b3sum foo.txt
```

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