NAME¶

b3sum - compute and check BLAKE3 hash

USAGE¶

b3sum [FLAGS] [OPTIONS] [FILE]...

Print or check BLAKE3 checksums.

With no FILE, or when FILE is -, read standard input.

-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

--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.

<FILE>...: Files to hash, or checkfiles to check. When no file is given, or when - is given, read standard input.