[GH-ISSUE #210] compat: header protection fails to build on kernels < 5.5 #123

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opened 2026-10-13 21:06:46 +00:00 by bsakaguchi · 0 comments

bsakaguchi commented

2026-10-13 21:06:46 +00:00

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Originally created by @Ser9ei on GitHub (Aug 8, 2026).
Original GitHub issue: https://github.com/amnezia-vpn/amneziawg-linux-kernel-module/issues/210

On kernels before 5.5, <crypto/chacha.h> is either missing or provides a different skcipher-oriented API (struct chacha_ctx, crypto_chacha_init, …) without the library interface required by AWG 3.0 header protection:

chacha_init(u32 *state, const u32 *key, const u8 *iv)
chacha20_crypt(u32 *state, u8 *dst, const u8 *src, unsigned int bytes)
struct chacha_state { u32 x[...]; }

As a result, the module fails to build on older kernels.

Originally created by @Ser9ei on GitHub (Aug 8, 2026). Original GitHub issue: https://github.com/amnezia-vpn/amneziawg-linux-kernel-module/issues/210 On kernels before 5.5, <crypto/chacha.h> is either missing or provides a different skcipher-oriented API (struct chacha_ctx, crypto_chacha_init, …) without the library interface required by AWG 3.0 header protection: - chacha_init(u32 *state, const u32 *key, const u8 *iv) - chacha20_crypt(u32 *state, u8 *dst, const u8 *src, unsigned int bytes) - struct chacha_state { u32 x[...]; } As a result, the module fails to build on older kernels.

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amnezia-vpn/amneziawg-linux-kernel-module#123

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