libscrc
Library for calculating CRC3/CRC4/CRC8/CRC16/CRC24/CRC32/CRC64/CRC82
Decision gist · record as of 2026-08-14
Yes, if you need CRC calculation and can accept GPLv3+ licensing. The package is actively maintained, widely pre-compiled, and covers an unusually comprehensive set of CRC variants. Install friction is low for most modern Python environments. Not suitable for proprietary projects without a separate license agreement.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Medium install friction due to compiled wheels.
- The package is actively maintained with recent commits and has broad pre-built wheel coverage across Python 2.7 through 3.12 and multiple platforms (x86_64, ARM, Windows), reducing build requirements for most users.
License · maintenance · safety
copyleft license (copyleft) — Licensed under GPLv3+, a copyleft license. Any derivative work or distribution must also be open-source under compatible terms; proprietary projects cannot use this without obtaining an alternative license.
last release 2022-08-18 (1457 days) · last repo commit 2026-06-07 · 61 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 498,874 downloads/mo, #6,327 on PyPI
Alternatives
Verify before relying
pip install libscrc
import libscrc
crc16 = libscrc.modbus(b'1234')
crc16 = libscrc.xmodem(b'5678', crc16) # incremental- Whether the package is still actively maintained beyond the last release date (2022-08-18) given the 1457 days since release
- Performance characteristics and typical use cases for incremental CRC computation introduced in v1.4+
What it is and what it does
libscrc is a Python binding to a compiled CRC calculation library supporting a large range of CRC polynomial variants used in industrial protocols, telecommunications, and data integrity applications. It exposes individual functions for each CRC type (e.g., libscrc.modbus, libscrc.xmodem, libscrc.crc32) that accept byte strings or bytearrays and return integer checksums. The library supports both single-pass calculation and incremental computation, where a previous CRC result can be passed as a second argument to continue checksumming additional data.
The package is distributed as pre-compiled wheels for CPython 2.7 and 3.4–3.12 across Linux (x86_64, ARM, ARM64), macOS, Windows, and musl-based systems, minimizing compilation overhead on common platforms. It has no runtime dependencies beyond the Python standard library and wheel metadata.
Use it for
- Verify Modbus RTU protocol checksums in industrial automation and SCADA systems
- Calculate CRC16 or CRC32 for data transmission protocols like Xmodem or Zmodem
- Implement incremental CRC checksums for streaming or large file integrity checks
- Validate RFID EPC tags and other embedded system checksums
- Compute TCP/UDP pseudo-header checksums for network packet validation
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need CRC calculation and can accept GPLv3+ licensing.
The package is actively maintained, widely pre-compiled, and covers an unusually comprehensive set of CRC variants. Install friction is low for most modern Python environments. Not suitable for proprietary projects without a separate license agreement.
Install
libscrc on PyPI
Before you install
Medium install friction due to compiled wheels. The package is actively maintained with recent commits and has broad pre-built wheel coverage across Python 2.7 through 3.12 and multiple platforms (x86_64, ARM, Windows), reducing build requirements for most users.
License in practice
Licensed under GPLv3+, a copyleft license. Any derivative work or distribution must also be open-source under compatible terms; proprietary projects cannot use this without obtaining an alternative license.
Quickstart
pip install libscrc
import libscrc
crc16 = libscrc.modbus(b'1234')
crc16 = libscrc.xmodem(b'5678', crc16) # incrementalVerify before relying
- Whether the package is still actively maintained beyond the last release date (2022-08-18) given the 1457 days since release
- Performance characteristics and typical use cases for incremental CRC computation introduced in v1.4+
Package facts
| License | copyleft license copyleft |
| Python support | Not specified |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | 1 packagewheel |
| Maintenance | Actively maintained 1,457 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 498,874 / month, #6,327 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)Programming Language :: Python :: 2Programming Language :: Python :: 2.7Programming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.4Programming Language :: Python :: 3.5Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: Libraries :: Python Modules |
Evidence: libscrc-1.8.1-cp27-cp27m-macosx_12_0_x86_64.whl; libscrc-1.8.1-cp27-cp27mu-manylinux_2_17_armv7l.manylinux2014_armv7l.whl; libscrc-1.8.1-cp27-cp27mu-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp310-cp310-macosx_10_9_universal2.whl; libscrc-1.8.1-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl; libscrc-1.8.1-cp310-cp310-manylinux_2_17_armv7l.manylinux2014_armv7l.whl; libscrc-1.8.1-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp310-cp310-musllinux_1_2_x86_64.whl; libscrc-1.8.1-cp310-cp310-win32.whl; libscrc-1.8.1-cp310-cp310-win_amd64.whl; libscrc-1.8.1-cp311-cp311-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp312-cp312-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp34-cp34m-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp34-cp34m-win32.whl; libscrc-1.8.1-cp34-cp34m-win_amd64.whl; libscrc-1.8.1-cp35-cp35m-manylinux_2_17_armv7l.manylinux2014_armv7l.whl; libscrc-1.8.1-cp35-cp35m-manylinux_2_5_x86_64.manylinux1_x86_64.whl; libscrc-1.8.1-cp35-cp35m-win32.whl; libscrc-1.8.1-cp35-cp35m-win_amd64.whl; libscrc-1.8.1-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
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See also fastcrc · crccheck · crc · crcengine · anycrc · crcmod · lpc-checksum · filehash · hexrec · deflate