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node.js CRC-32C algorithm with hardware acceleration and software fallback.
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README.md

fast-crc32c NPM version Build Status Dependency Status

fast-crc32c is a CRC-32C algorithm implementation for node.js, which uses hardware acceleration (via voxer/sse4_crc32 by Anand Suresh), and fallback to software implementation when hardware acceleration fails.

Performance

CRC-32C is faster then CRC-32, which could take advantage of full CPU operand register width (64bit) instead of CRC-32's 8bit.

When using hardware acceleration, CRC-32C is about 7x ~ 9x faster than software implemented CRC-32C.

Benchmark

The 3 tested implementations are:

  • sse4_crc32c Hardware accelerated CRC-32C from sse4_crc32
  • js_crc32c Javascript implemented CRC-32C
  • js_crc32 Javascript implemented CRC-32 from buffer-crc32
$ npm run-script benchmark

> fast-crc32c@1.0.2 benchmark /Users/xshi/Projects/node-fast-crc32c
> node benchmark

sse4_crc32c_hw for inputs 1024B x 1,837,024 ops/sec ±1.76% (83 runs sampled)
sse4_crc32c_hw for inputs 16856835B, avg 2057B x 203 ops/sec ±2.37% (78 runs sampled)
sse4_crc32c_sw for inputs 1024B x 911,096 ops/sec ±1.07% (85 runs sampled)
sse4_crc32c_sw for inputs 16856835B, avg 2057B x 72.74 ops/sec ±1.29% (72 runs sampled)
js_crc32c for inputs 1024B x 356,253 ops/sec ±1.07% (86 runs sampled)
js_crc32c for inputs 16856835B, avg 2057B x 22.40 ops/sec ±1.09% (41 runs sampled)
js_crc32 for inputs 1024B x 351,668 ops/sec ±0.94% (87 runs sampled)
js_crc32 for inputs 16856835B, avg 2057B x 22.25 ops/sec ±1.11% (40 runs sampled)
1024B 16856835B, avg 2057B
sse4_crc32c_hw 1,837,024 ops/sec 203 ops/sec
sse4_crc32c_sw 911,096 ops/sec 72.74 ops/sec
js_crc32c 356,253 ops/sec 22.40 ops/sec
js_crc32 351,668 ops/sec 22.25 ops/sec

Install

npm install fast-crc32c --save

Usage

var crc32 = require('fast-crc32c');
var result = crc32.calculate(data, initial);
  • data required, String|Buffer, data to digest
  • initial optional, Number, initial CRC-32C digest
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