b404c851c2
Changes since 0.3.8: - Add Hash::from_hex() and implement FromStr for Hash. - Implement Display for Hash, equivalent to Hash::to_hex(). - Implement PartialEq<[u8]> for Hash, using constant_time_eq. - Change derive_key() to return a 32-byte array. As with hash() and keyed_hash(), callers who want a non-default output length can use Hasher::finalize_xof(). - Replace Hasher::update_with_join() with Hasher::update_rayon(). The former was excessively generic, and the Join trait leaked implementation details. As part of this change, the Join trait is no longer public. - Upgraded arrayvec to 0.7.0, which uses const generics. This bumps the minimum supported Rust compiler version to 1.51. - Gate the digest and crypto-mac trait implementations behind an unstable feature, "traits-preview". As part of this change upgrade crypto-mac to 0.11.0. |
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src | ||
tests | ||
Cargo.toml | ||
README.md | ||
what_does_check_do.md |
b3sum
A command line utility for calculating
BLAKE3 hashes, similar to
Coreutils tools like b2sum
or md5sum
.
b3sum 0.3.6
USAGE:
b3sum [FLAGS] [OPTIONS] [FILE]...
FLAGS:
-c, --check Reads BLAKE3 sums from the [file]s and checks them
-h, --help Prints help information
--keyed Uses the keyed mode. The secret key is read from standard
input, and it must be exactly 32 raw bytes.
--no-mmap Disables memory mapping. Currently this also disables
multithreading.
--no-names Omits filenames in the output
--quiet Skips printing OK for each successfully verified file.
Must be used with --check.
--raw Writes raw output bytes to stdout, rather than hex.
--no-names is implied. In this case, only a single
input is allowed.
-V, --version Prints version information
OPTIONS:
--derive-key <CONTEXT> Uses the key derivation mode, with the given
context string. Cannot be used with --keyed.
-l, --length <LEN> The number of output bytes, prior to hex
encoding (default 32)
--num-threads <NUM> The maximum number of threads to use. By
default, this is the number of logical cores.
If this flag is omitted, or if its value is 0,
RAYON_NUM_THREADS is also respected.
ARGS:
<FILE>... Files to hash, or checkfiles to check. When no file is given,
or when - is given, read standard input.
See also this document about how the --check
flag
works.
Example
Hash the file foo.txt
:
b3sum foo.txt
Time hashing a gigabyte of data, to see how fast it is:
# 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
Installation
Prebuilt binaries are available for Linux, Windows, and macOS (requiring
the unidentified developer
workaround)
on the releases page.
If you've installed Rust and
Cargo,
you can also build b3sum
yourself with:
cargo install b3sum
On Linux for example, Cargo will put the compiled binary in
~/.cargo/bin
. You might want to add that directory to your $PATH
, or
rustup
might have done it for you when you installed Cargo.
If you want to install directly from this directory, you can run cargo install --path .
. Or you can just build with cargo build --release
,
which puts the binary at ./target/release/b3sum
.