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cksum: add support for --algorithm=crc32b

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$ echo -n '123456789' | cksum --raw -a crc32b | basenc --base16
  CBF43926

* bootstrap.conf: Explicitly depend on the crc module.
* doc/coreutils.texi (cksum): Add "crc32b" as an argument to -a.
* src/cksum.c (crc32b_sum_stream): A new function similar to
crc_sum_stream, but which does not include the length in
the CRC calculation.
* src/cksum.h: Add crc32b_sum_stream prototype.
* src/digest.c: Add "crc32b" as an argument to -a.
* tests/cksum/cksum.sh: Refactor to test both crc and crc32b.
* tests/cksum/cksum-a.sh: Add "crc32b" case.
* tests/cksum/cksum-base64.pl: Likewise.
* tests/misc/read-errors.sh: Likewise.
* NEWS: Mention the new feature.
This commit is contained in:
Pádraig Brady
2024-11-01 15:11:55 +00:00
parent ee231019e1
commit a94929715c
10 changed files with 87 additions and 30 deletions
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8
doc/coreutils.texi
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@@ -4051,7 +4051,8 @@ and the file name unless no arguments were given.
The 32-bit CRC used is based on the polynomial used
for CRC error checking in the ISO/IEC 8802-3:1996 standard (Ethernet).
Similar output formats are used for the other legacy checksums
selectable with @option{--algorithm=sysv} or @option{--algorithm=bsd},
selectable with @option{--algorithm=crc32b}, and
@option{--algorithm=sysv} or @option{--algorithm=bsd}
detailed at @ref{sum invocation}.
@item Tagged output format
@@ -4100,6 +4101,7 @@ Supported legacy checksums (which are not supported by @option{--check}):
@samp{sysv} equivalent to @command{sum -s}
@samp{bsd} equivalent to @command{sum -r}
@samp{crc} equivalent to @command{cksum} (the default)
@samp{crc32b} only available through @command{cksum}
@end example
Supported more modern digest algorithms are:
@@ -4151,7 +4153,7 @@ as the length is automatically determined when checking.
Print only the unencoded raw binary digest for a single input.
Do not output the file name or anything else.
Use network byte order (big endian) where applicable:
for @samp{bsd}, @samp{crc}, and @samp{sysv}.
for @samp{bsd}, @samp{crc}, @samp{crc32b}, and @samp{sysv}.
This option works only with a single input.
Unlike other output formats, @command{cksum} provides no way to
@option{--check} a @option{--raw} checksum.
@@ -4225,7 +4227,7 @@ a checksum inconsistent with the associated file, or if no valid
line is found, @command{cksum} exits with nonzero status. Otherwise,
it exits successfully.
The @command{cksum} command does not support @option{--check}
with the older @samp{sysv}, @samp{bsd}, or @samp{crc} algorithms.
with the older @samp{sysv}, @samp{bsd}, @samp{crc} or @samp{crc32b} algorithms.
@item --ignore-missing
@opindex --ignore-missing