crc32_le(9)

💅 crc32_le(9) — like, the Kernel API Manual bestie 🌈

okay so real talk, welcome to crc32_le(9), the little kernel function that computes the least-significant-bit-first IEEE CRC-32. she's iconic, she's everywhere, and yes she has ✨ lore ✨ — let's get into it 🫶

✨ NAME ✨

crc32_le — Compute least-significant-bit-first IEEE CRC-32 🎀

🌸 SYNOPSIS 🌸

u32 crc32_le (u32 crc , const void *p , size_t len );

like, that's the whole vibe check right there 💅

🦋 ARGUMENTS 🦋

• crc — the Initial CRC value, bestie. pass ~0 (recommended 👑) or 0 when you're starting a brand-new CRC computation, or hand over the previous CRC value if you're computing incrementally. no cap, incremental is a whole mood.
• p — Pointer to the data buffer 📍 like, where the bytes actually live.
• len — Length of data in bytes 🍓 (bytes!! not vibes, bytes).

💖 DESCRIPTION 💖

okay so this implements the CRC variant that everyone and their group chat knows as the IEEE CRC-32, or honestly just CRC-32, and it is widely used in Ethernet and a bunch of other applications 🌐🔥:

• Polynomial: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + x^0 — yes she's long, she's dramatic, she ate 💀
• Bit order: Least-significant-bit-first 🧚 (it's literally in the name, iykyk)
• Polynomial in integer form: 0xedb88320 ⭐

⚠️ okay important: this does *not* invert the CRC at the beginning or end. like, at all. the caller is expected to do that if it needs to. and ngl, inverting at both ends is recommended 💅

For new applications, please prefer to use CRC-32C instead — see crc32c 🌸 trust, it's the main character for new stuff 👑

🎀 CONTEXT 🎀

Any context 😌 she's flexible like that. no restrictions, go off.

💜 RETURN 💜

The new CRC value ✨ (that's it, that's the return, and she slays it every time)

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/crc32.h
• crc32_be(9)
• crc32c(9)

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and that's the page, bestie 🫶 source/version: ./include/linux — October 2026 — crc32_le(9). mwah, go compute some checksums, ily 💖🎀🦋