https://github.com/jaybrown/cn
Apple's open source command line interface to CommonNumerics routines (CRC-8/16/32/64, Base16/32/64)
https://github.com/jaybrown/cn
adler-32 algorithm base16 base32 base64 castagnoli checksum cli commoncrypto commonnumerics crc crc-16 crc-32 crc-32c crc-8 fletcher hash hashing macos osx
Last synced: 3 months ago
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Apple's open source command line interface to CommonNumerics routines (CRC-8/16/32/64, Base16/32/64)
- Host: GitHub
- URL: https://github.com/jaybrown/cn
- Owner: JayBrown
- License: other
- Created: 2017-02-16T11:54:54.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2017-02-16T15:50:10.000Z (over 8 years ago)
- Last Synced: 2025-03-14T09:30:49.330Z (7 months ago)
- Topics: adler-32, algorithm, base16, base32, base64, castagnoli, checksum, cli, commoncrypto, commonnumerics, crc, crc-16, crc-32, crc-32c, crc-8, fletcher, hash, hashing, macos, osx
- Language: C
- Homepage:
- Size: 32.2 KB
- Stars: 2
- Watchers: 2
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGES.md
- License: LICENSE.md
Awesome Lists containing this project
README
The **cn** command line interface to CommonNumerics routines has been published by Apple as part of their **[Open Source](https://opensource.apple.com)** project.
It belongs to the **[CommonCrypto library](https://opensource.apple.com/source/CommonCrypto/)**, but it has not been built/installed into macOS.
You can install **cn** using **[Homebrew](https://brew.sh)** (recommended) with `brew tap JayBrown/cn && brew install cn` ([tap repo with formula](https://github.com/JayBrown/homebrew-cn)), or you can **manually make/build** with `make clean` and `make cn`.
## Functionality (man page)
```
cn(1) BSD General Commands Manual cn(1)
NAME
cn -- Command line interface to CommonNumerics routines.
SYNOPSIS
cn [-p prompt] [command] [command_options] [command_args]
DESCRIPTION
A simple command line utility allowing you to perform CRC and Base Encode/Decode with the Common Numerics functions.
cn has the following standard options for all sub-commands:
-h Show help information.
-a Use the specified algorithm. The CRC, Encode, and Decode commands have various algorithms that can be used
on data provided to them.
-s - Performs the operation on the specified string value.
-v Function in Verbose mode.
CN COMMAND SUMMARY
cn currently only provides functions for two activities: CRC calculation and Base Encoding and Decoding (base16, base32,
base64).
Here are brief descriptions of all the cn commands:
crc Perform a CRC on the data provided either as a string or on stdin.
Algorithms
10 - kCN_CRC_8
11 - kCN_CRC_8_ICODE
12 - kCN_CRC_8_ITU
13 - kCN_CRC_8_ROHC
14 - kCN_CRC_8_WCDMA
20 - kCN_CRC_16
21 - kCN_CRC_16_CCITT_TRUE
22 - kCN_CRC_16_CCITT_FALSE
23 - kCN_CRC_16_USB
24 - kCN_CRC_16_XMODEM
25 - kCN_CRC_16_DECT_R
26 - kCN_CRC_16_DECT_X
27 - kCN_CRC_16_ICODE
28 - kCN_CRC_16_VERIFONE
29 - kCN_CRC_16_A
30 - kCN_CRC_16_B
31 - kCN_CRC_16_Fletcher
40 - kCN_CRC_32_Adler
41 - kCN_CRC_32
42 - kCN_CRC_32_CASTAGNOLI
43 - kCN_CRC_32_BZIP2
44 - kCN_CRC_32_MPEG_2
45 - kCN_CRC_32_POSIX
46 - kCN_CRC_32_XFER
60 - kCN_CRC_64_ECMA_182
Encode|Decode Encode or Decode data provided either as a string or on stdin using one of the algorithms specified below.
Algorithms
1 - kCNEncodingBase64
2 - kCNEncodingBase32
3 - kCNEncodingBase32Recovery
4 - kCNEncodingBase32HEX
5 - kCNEncodingBase16
ENVIRONMENT
CN_READ_SIZE The "read size" to use when processing incoming data.
CN_WIDTH The number of columns in which to output data when performing a base encoding. The default is 64 columns.
HISTORY
cn was introduced in Mac OS X version 10.9 and iOS version 7.0.
Darwin February 16, 2017 Darwin
```