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|
# Digest CRC
[](https://github.com/postmodern/digest-crc/actions/workflows/ruby.yml)
* [Source](https://github.com/postmodern/digest-crc)
* [Issues](https://github.com/postmodern/digest-crc/issues)
* [Documentation](http://rubydoc.info/gems/digest-crc/frames)
## Description
Adds support for calculating Cyclic Redundancy Check (CRC) to the Digest
module.
## Features
* Provides support for the following CRC algorithms:
* [CRC1](https://rubydoc.info/gems/digest-crc/Digest/CRC1)
* [CRC5](https://rubydoc.info/gems/digest-crc/Digest/CRC5)
* [CRC8](https://rubydoc.info/gems/digest-crc/Digest/CRC8)
* [CRC8 1-Wire](https://rubydoc.info/gems/digest-crc/Digest/CRC8_1Wire)
* [CRC15](https://rubydoc.info/gems/digest-crc/Digest/CRC15)
* [CRC16](https://rubydoc.info/gems/digest-crc/Digest/CRC16)
* [CRC16 CCITT](https://rubydoc.info/gems/digest-crc/Digest/CRC16CCITT)
* [CRC16 DNP](https://rubydoc.info/gems/digest-crc/Digest/CRC16DNP)
* [CRC16 Genibus](https://rubydoc.info/gems/digest-crc/Digest/CRC16Genibus)
* [CRC16 Kermit](https://rubydoc.info/gems/digest-crc/Digest/CRC16Kermit)
* [CRC16 Modbus](https://rubydoc.info/gems/digest-crc/Digest/CRC16Modbus)
* [CRC16 USB](https://rubydoc.info/gems/digest-crc/Digest/CRC16USB)
* [CRC16 X25](https://rubydoc.info/gems/digest-crc/Digest/CRC16X25)
* [CRC16 XModem](https://rubydoc.info/gems/digest-crc/Digest/CRC16XModem)
* [CRC16 ZModem](https://rubydoc.info/gems/digest-crc/Digest/CRC16ZModem)
* [CRC16 QT](https://rubydoc.info/gems/digest-crc/Digest/CRC16QT)
* [CRC24](https://rubydoc.info/gems/digest-crc/Digest/CRC24)
* [CRC32](https://rubydoc.info/gems/digest-crc/Digest/CRC32)
* [CRC32 BZip2](https://rubydoc.info/gems/digest-crc/Digest/CRC32BZip2)
* [CRC32c](https://rubydoc.info/gems/digest-crc/Digest/CRC32c)
* [CRC32 Jam](https://rubydoc.info/gems/digest-crc/Digest/CRC32Jam)
* [CRC32 MPEG](https://rubydoc.info/gems/digest-crc/Digest/CRC32MPEG)
* [CRC32 POSIX](https://rubydoc.info/gems/digest-crc/Digest/CRC32POSIX)
* [CRC32 XFER](https://rubydoc.info/gems/digest-crc/Digest/CRC32XFER)
* [CRC64](https://rubydoc.info/gems/digest-crc/Digest/CRC64)
* [CRC64 Jones](https://rubydoc.info/gems/digest-crc/Digest/CRC64Jones)
* [CRC64 NVMe](https://rubydoc.info/gems/digest-crc/Digest/CRC64Nvme)
* [CRC64 XZ](https://rubydoc.info/gems/digest-crc/Digest/CRC64XZ)
* Pure Ruby implementation.
* Provides CRC Tables for optimized calculations.
* Supports _optional_ C extensions which increases performance by ~40x.
* If the C extensions cannot be compiled for whatever reason, digest-crc
will automatically fallback to the pure-Ruby implementation.
## Install
```
gem install digest-crc
```
**Note:** to enable the C extensions ensure that you are using CRuby and have
a C compiler (`gcc` or `clang`) and `make` installed, _before_ installing
digest-crc.
* Debian / Ubuntu:
$ sudo apt install gcc make
* RedHat / Fedora:
$ sudo dnf install gcc make
* Alpine Linux:
$ apk add build-base
* macOS: install XCode
## Examples
Calculate a CRC32:
```ruby
require 'digest/crc32'
Digest::CRC32.hexdigest('hello')
# => "3610a686"
```
Calculate a CRC32 of a file:
```ruby
Digest::CRC32.file('README.md')
# => #<Digest::CRC32: 127ad531>
```
Incrementally calculate a CRC32:
```ruby
crc = Digest::CRC32.new
crc << 'one'
crc << 'two'
crc << 'three'
crc.hexdigest
# => "09e1c092"
```
Directly access the checksum:
```ruby
crc.checksum
# => 165789842
```
Defining your own CRC class:
```ruby
require 'digest/crc32'
module Digest
class CRC3000 < CRC32
WIDTH = 32
REFLECT_INPUT = true
INIT_CRC = 0xffffffff
XOR_MASK = 0xffffffff
TABLE = [
# ....
].freeze
end
end
```
## Benchmarks
### Ruby 2.7.4 (pure Ruby)
$ bundle exec rake clean
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.423741 0.000000 0.423741 ( 0.425887)
Digest::CRC5#update 1.486578 0.000011 1.486589 ( 1.493215)
Digest::CRC8#update 1.261386 0.000000 1.261386 ( 1.266399)
Digest::CRC8_1Wire#update 1.250344 0.000000 1.250344 ( 1.255009)
Digest::CRC15#update 1.482515 0.000000 1.482515 ( 1.488131)
Digest::CRC16#update 1.216744 0.000811 1.217555 ( 1.222228)
Digest::CRC16CCITT#update 1.480490 0.000000 1.480490 ( 1.486745)
Digest::CRC16DNP#update 1.200067 0.000000 1.200067 ( 1.204835)
Digest::CRC16Genibus#update 1.492910 0.000000 1.492910 ( 1.498923)
Digest::CRC16Modbus#update 1.217449 0.000003 1.217452 ( 1.222348)
Digest::CRC16QT#update 1.223311 0.000000 1.223311 ( 1.229211)
Digest::CRC16USB#update 1.233744 0.000000 1.233744 ( 1.238615)
Digest::CRC16X25#update 1.223077 0.000000 1.223077 ( 1.227607)
Digest::CRC16XModem#update 1.487674 0.000000 1.487674 ( 1.493316)
Digest::CRC16ZModem#update 1.484288 0.000000 1.484288 ( 1.490096)
Digest::CRC24#update 1.490272 0.000000 1.490272 ( 1.496027)
Digest::CRC32#update 1.225311 0.000000 1.225311 ( 1.230572)
Digest::CRC32BZip2#update 1.503096 0.000000 1.503096 ( 1.509202)
Digest::CRC32c#update 1.220390 0.000000 1.220390 ( 1.225487)
Digest::CRC32Jam#update 1.216066 0.000000 1.216066 ( 1.220591)
Digest::CRC32MPEG#update 1.486808 0.000000 1.486808 ( 1.492611)
Digest::CRC32POSIX#update 1.494508 0.000957 1.495465 ( 1.503262)
Digest::CRC32XFER#update 1.504802 0.005830 1.510632 ( 1.522066)
Digest::CRC64#update 3.260784 0.015674 3.276458 ( 3.310506)
Digest::CRC64Jones#update 3.195204 0.000000 3.195204 ( 3.213054)
Digest::CRC64XZ#update 3.173597 0.000000 3.173597 ( 3.190438)
### Ruby 2.7.4 (C extensions)
$ bundle exec rake build:c_exts
...
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.443619 0.000007 0.443626 ( 0.446545)
Digest::CRC5#update 0.025134 0.000806 0.025940 ( 0.026129)
Digest::CRC8#update 0.022564 0.000000 0.022564 ( 0.022775)
Digest::CRC8_1Wire#update 0.021427 0.000008 0.021435 ( 0.021551)
Digest::CRC15#update 0.030377 0.000833 0.031210 ( 0.031406)
Digest::CRC16#update 0.024004 0.000002 0.024006 ( 0.024418)
Digest::CRC16CCITT#update 0.026930 0.000001 0.026931 ( 0.027238)
Digest::CRC16DNP#update 0.024279 0.000000 0.024279 ( 0.024446)
Digest::CRC16Genibus#update 0.026477 0.000004 0.026481 ( 0.026656)
Digest::CRC16Modbus#update 0.023568 0.000000 0.023568 ( 0.023704)
Digest::CRC16QT#update 0.024161 0.000000 0.024161 ( 0.024316)
Digest::CRC16USB#update 0.023891 0.000000 0.023891 ( 0.024038)
Digest::CRC16X25#update 0.023849 0.000000 0.023849 ( 0.023991)
Digest::CRC16XModem#update 0.026254 0.000000 0.026254 ( 0.026523)
Digest::CRC16ZModem#update 0.026391 0.000000 0.026391 ( 0.026529)
Digest::CRC24#update 0.028805 0.000854 0.029659 ( 0.029830)
Digest::CRC32#update 0.024030 0.000000 0.024030 ( 0.024200)
Digest::CRC32BZip2#update 0.026942 0.000000 0.026942 ( 0.027244)
Digest::CRC32c#update 0.023989 0.000000 0.023989 ( 0.024159)
Digest::CRC32Jam#update 0.023940 0.000000 0.023940 ( 0.024066)
Digest::CRC32MPEG#update 0.027063 0.000000 0.027063 ( 0.027213)
Digest::CRC32POSIX#update 0.027137 0.000000 0.027137 ( 0.028160)
Digest::CRC32XFER#update 0.026956 0.000002 0.026958 ( 0.027103)
Digest::CRC64#update 0.024222 0.000005 0.024227 ( 0.024796)
Digest::CRC64Jones#update 0.025331 0.000000 0.025331 ( 0.025789)
Digest::CRC64XZ#update 0.024131 0.000001 0.024132 ( 0.024348)
### Ruby 3.0.2 (pure Ruby)
$ bundle exec rake clean
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.331405 0.000002 0.331407 ( 0.333588)
Digest::CRC5#update 1.206847 0.000020 1.206867 ( 1.224072)
Digest::CRC8#update 1.018571 0.000000 1.018571 ( 1.023002)
Digest::CRC8_1Wire#update 1.018802 0.000000 1.018802 ( 1.023292)
Digest::CRC15#update 1.207586 0.000000 1.207586 ( 1.212691)
Digest::CRC16#update 1.032505 0.000965 1.033470 ( 1.040862)
Digest::CRC16CCITT#update 1.198079 0.000000 1.198079 ( 1.203134)
Digest::CRC16DNP#update 0.994582 0.000000 0.994582 ( 1.006520)
Digest::CRC16Genibus#update 1.190596 0.000000 1.190596 ( 1.196087)
Digest::CRC16Modbus#update 1.007826 0.000000 1.007826 ( 1.012934)
Digest::CRC16QT#update 0.996298 0.000001 0.996299 ( 1.000255)
Digest::CRC16USB#update 0.995806 0.000000 0.995806 ( 0.999822)
Digest::CRC16X25#update 1.019589 0.000000 1.019589 ( 1.031010)
Digest::CRC16XModem#update 1.146947 0.000000 1.146947 ( 1.150817)
Digest::CRC16ZModem#update 1.145145 0.000000 1.145145 ( 1.149483)
Digest::CRC24#update 1.149009 0.000000 1.149009 ( 1.152854)
Digest::CRC32#update 0.970976 0.000000 0.970976 ( 0.974227)
Digest::CRC32BZip2#update 1.148596 0.000000 1.148596 ( 1.152381)
Digest::CRC32c#update 0.972566 0.000000 0.972566 ( 0.975790)
Digest::CRC32Jam#update 0.975854 0.000000 0.975854 ( 0.979217)
Digest::CRC32MPEG#update 1.148578 0.000000 1.148578 ( 1.153088)
Digest::CRC32POSIX#update 1.146218 0.000986 1.147204 ( 1.152460)
Digest::CRC32XFER#update 1.149823 0.000000 1.149823 ( 1.153692)
Digest::CRC64#update 2.869948 0.000016 2.869964 ( 2.884261)
Digest::CRC64Jones#update 2.867662 0.000000 2.867662 ( 2.886559)
Digest::CRC64XZ#update 2.858847 0.000000 2.858847 ( 2.874058)
### Ruby 3.0.2 (C extensions)
$ bundle exec rake build:c_exts
...
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.349055 0.000000 0.349055 ( 0.350454)
Digest::CRC5#update 0.023144 0.000000 0.023144 ( 0.023248)
Digest::CRC8#update 0.021378 0.000000 0.021378 ( 0.021522)
Digest::CRC8_1Wire#update 0.021019 0.000000 0.021019 ( 0.021145)
Digest::CRC15#update 0.030063 0.000003 0.030066 ( 0.030245)
Digest::CRC16#update 0.024395 0.000000 0.024395 ( 0.024572)
Digest::CRC16CCITT#update 0.026979 0.000000 0.026979 ( 0.027138)
Digest::CRC16DNP#update 0.024665 0.000000 0.024665 ( 0.024844)
Digest::CRC16Genibus#update 0.027054 0.000000 0.027054 ( 0.027217)
Digest::CRC16Modbus#update 0.023963 0.000000 0.023963 ( 0.024257)
Digest::CRC16QT#update 0.024218 0.000000 0.024218 ( 0.024360)
Digest::CRC16USB#update 0.024393 0.000000 0.024393 ( 0.024561)
Digest::CRC16X25#update 0.025127 0.000000 0.025127 ( 0.025292)
Digest::CRC16XModem#update 0.028123 0.000000 0.028123 ( 0.028377)
Digest::CRC16ZModem#update 0.028205 0.000000 0.028205 ( 0.028571)
Digest::CRC24#update 0.031386 0.000000 0.031386 ( 0.031740)
Digest::CRC32#update 0.023832 0.000000 0.023832 ( 0.023948)
Digest::CRC32BZip2#update 0.027159 0.000000 0.027159 ( 0.027315)
Digest::CRC32c#update 0.024172 0.000000 0.024172 ( 0.024310)
Digest::CRC32Jam#update 0.024376 0.000000 0.024376 ( 0.024494)
Digest::CRC32MPEG#update 0.026035 0.000784 0.026819 ( 0.026940)
Digest::CRC32POSIX#update 0.026784 0.000000 0.026784 ( 0.026907)
Digest::CRC32XFER#update 0.026770 0.000000 0.026770 ( 0.026893)
Digest::CRC64#update 0.024400 0.000009 0.024409 ( 0.024531)
Digest::CRC64Jones#update 0.023477 0.000781 0.024258 ( 0.024390)
Digest::CRC64XZ#update 0.024611 0.000000 0.024611 ( 0.024779)
### JRuby 9.2.18.0 (pure Ruby)
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 1.080000 0.050000 1.130000 ( 0.676022)
Digest::CRC5#update 2.030000 0.040000 2.070000 ( 1.089240)
Digest::CRC8#update 1.590000 0.000000 1.590000 ( 0.999138)
Digest::CRC8_1Wire#update 0.920000 0.010000 0.930000 ( 0.873813)
Digest::CRC15#update 1.470000 0.030000 1.500000 ( 1.118886)
Digest::CRC16#update 1.780000 0.010000 1.790000 ( 1.067874)
Digest::CRC16CCITT#update 1.500000 0.070000 1.570000 ( 1.185564)
Digest::CRC16DNP#update 1.250000 0.000000 1.250000 ( 0.972322)
Digest::CRC16Genibus#update 1.700000 0.010000 1.710000 ( 1.092047)
Digest::CRC16Modbus#update 1.000000 0.010000 1.010000 ( 0.915328)
Digest::CRC16QT#update 1.250000 0.000000 1.250000 ( 0.968528)
Digest::CRC16USB#update 1.150000 0.010000 1.160000 ( 0.990387)
Digest::CRC16X25#update 0.940000 0.000000 0.940000 ( 0.926926)
Digest::CRC16XModem#update 1.390000 0.010000 1.400000 ( 1.100584)
Digest::CRC16ZModem#update 1.760000 0.020000 1.780000 ( 1.094003)
Digest::CRC24#update 1.690000 0.010000 1.700000 ( 1.106875)
Digest::CRC32#update 1.410000 0.020000 1.430000 ( 1.082506)
Digest::CRC32BZip2#update 1.510000 0.010000 1.520000 ( 1.104225)
Digest::CRC32c#update 1.270000 0.010000 1.280000 ( 1.023881)
Digest::CRC32Jam#update 1.190000 0.010000 1.200000 ( 0.998146)
Digest::CRC32MPEG#update 1.580000 0.010000 1.590000 ( 1.099086)
Digest::CRC32POSIX#update 1.550000 0.010000 1.560000 ( 1.142051)
Digest::CRC32XFER#update 1.360000 0.000000 1.360000 ( 1.071381)
Digest::CRC64#update 3.730000 0.020000 3.750000 ( 2.780390)
Digest::CRC64Jones#update 2.710000 0.020000 2.730000 ( 2.608007)
Digest::CRC64XZ#update 2.910000 0.020000 2.930000 ( 2.629401)
### TruffleRuby 21.2.0 (pure Ruby)
$ bundle exec rake clean
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.455340 0.000000 0.455340 ( 0.457710)
Digest::CRC5#update 1.406700 0.000000 1.406700 ( 1.412535)
Digest::CRC8#update 1.248323 0.000000 1.248323 ( 1.255452)
Digest::CRC8_1Wire#update 1.269434 0.000000 1.269434 ( 1.275315)
Digest::CRC15#update 1.428752 0.000000 1.428752 ( 1.434836)
Digest::CRC16#update 1.220394 0.000967 1.221361 ( 1.229684)
Digest::CRC16CCITT#update 1.434932 0.001000 1.435932 ( 1.452391)
Digest::CRC16DNP#update 1.191351 0.000000 1.191351 ( 1.202262)
Digest::CRC16Genibus#update 1.434067 0.000000 1.434067 ( 1.440300)
Digest::CRC16Modbus#update 1.200827 0.000000 1.200827 ( 1.205658)
Digest::CRC16QT#update 1.195077 0.000000 1.195077 ( 1.200328)
Digest::CRC16USB#update 1.196266 0.000000 1.196266 ( 1.201262)
Digest::CRC16X25#update 1.206690 0.000000 1.206690 ( 1.211781)
Digest::CRC16XModem#update 1.430468 0.000000 1.430468 ( 1.436801)
Digest::CRC16ZModem#update 1.442524 0.000000 1.442524 ( 1.448624)
Digest::CRC24#update 1.447611 0.000018 1.447629 ( 1.454534)
Digest::CRC32#update 1.214314 0.000000 1.214314 ( 1.219838)
Digest::CRC32BZip2#update 1.427408 0.000000 1.427408 ( 1.433626)
Digest::CRC32c#update 1.204985 0.000000 1.204985 ( 1.210273)
Digest::CRC32Jam#update 1.235039 0.000000 1.235039 ( 1.240686)
Digest::CRC32MPEG#update 1.429731 0.000000 1.429731 ( 1.435404)
Digest::CRC32POSIX#update 1.458886 0.000000 1.458886 ( 1.465914)
Digest::CRC32XFER#update 1.422109 0.000000 1.422109 ( 1.427635)
Digest::CRC64#update 3.283506 0.000000 3.283506 ( 3.303129)
Digest::CRC64Jones#update 3.297402 0.000000 3.297402 ( 3.317357)
Digest::CRC64XZ#update 3.278551 0.001875 3.280426 ( 3.315165)
### TruffleRuby 21.2.0 (C extensions)
$ bundle exec rake build:c_exts
...
$ bundle exec ./benchmarks.rb
Loading Digest::CRC classes ...
Generating 1000 8Kb lengthed strings ...
Benchmarking Digest::CRC classes ...
user system total real
Digest::CRC1#update 0.480586 0.000014 0.480600 ( 0.482817)
Digest::CRC5#update 0.023795 0.000000 0.023795 ( 0.023941)
Digest::CRC8#update 0.020619 0.000000 0.020619 ( 0.020747)
Digest::CRC8_1Wire#update 0.020571 0.000000 0.020571 ( 0.020700)
Digest::CRC15#update 0.031224 0.000000 0.031224 ( 0.031412)
Digest::CRC16#update 0.024013 0.000000 0.024013 ( 0.024174)
Digest::CRC16CCITT#update 0.026790 0.000000 0.026790 ( 0.027079)
Digest::CRC16DNP#update 0.024253 0.000000 0.024253 ( 0.024427)
Digest::CRC16Genibus#update 0.027237 0.000000 0.027237 ( 0.027390)
Digest::CRC16Modbus#update 0.024376 0.000000 0.024376 ( 0.024548)
Digest::CRC16QT#update 0.024361 0.000000 0.024361 ( 0.024518)
Digest::CRC16USB#update 0.024142 0.000000 0.024142 ( 0.024311)
Digest::CRC16X25#update 0.024098 0.000000 0.024098 ( 0.024222)
Digest::CRC16XModem#update 0.026306 0.000000 0.026306 ( 0.026502)
Digest::CRC16ZModem#update 0.026536 0.000000 0.026536 ( 0.026688)
Digest::CRC24#update 0.029732 0.000000 0.029732 ( 0.029902)
Digest::CRC32#update 0.024219 0.000000 0.024219 ( 0.024391)
Digest::CRC32BZip2#update 0.026817 0.000000 0.026817 ( 0.027044)
Digest::CRC32c#update 0.023681 0.000000 0.023681 ( 0.023798)
Digest::CRC32Jam#update 0.024243 0.000000 0.024243 ( 0.024419)
Digest::CRC32MPEG#update 0.026865 0.000000 0.026865 ( 0.027020)
Digest::CRC32POSIX#update 0.026583 0.000000 0.026583 ( 0.026748)
Digest::CRC32XFER#update 0.027423 0.000000 0.027423 ( 0.027615)
Digest::CRC64#update 0.024150 0.000000 0.024150 ( 0.024310)
Digest::CRC64Jones#update 0.024218 0.000000 0.024218 ( 0.024363)
Digest::CRC64XZ#update 0.024124 0.000000 0.024124 ( 0.024255)
## Crystal
[crystal-crc] is a [Crystal][crystal-lang] port of this library.
[crystal-crc]: https://github.com/postmodern/crystal-crc
[crystal-lang]: https://www.crystal-lang.org/
## Thanks
Special thanks go out to the [pycrc](http://www.tty1.net/pycrc/) library
which is able to generate C source-code for all of the CRC algorithms,
including their CRC Tables.
## License
Copyright (c) 2010-2025 Hal Brodigan
See {file:LICENSE.txt} for license information.
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