Differential D26137 Diff 78675 sys/dev/if_wg/include/zinc/chacha20.h

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sys/dev/if_wg/include/zinc/chacha20.h

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				/* SPDX-License-Identifier: GPL-2.0 OR MIT */
				/*
				* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
				*/

				#ifndef _ZINC_CHACHA20_H
				#define _ZINC_CHACHA20_H

				#include <sys/param.h>
				#include <sys/support.h>

				enum chacha20_lengths {
				CHACHA20_NONCE_SIZE = 16,
				CHACHA20_KEY_SIZE = 32,
				CHACHA20_KEY_WORDS = CHACHA20_KEY_SIZE / sizeof(u32),
				CHACHA20_BLOCK_SIZE = 64,
				CHACHA20_BLOCK_WORDS = CHACHA20_BLOCK_SIZE / sizeof(u32),
				HCHACHA20_NONCE_SIZE = CHACHA20_NONCE_SIZE,
				HCHACHA20_KEY_SIZE = CHACHA20_KEY_SIZE
				};

				enum chacha20_constants { /* expand 32-byte k */
				CHACHA20_CONSTANT_EXPA = 0x61707865U,
				CHACHA20_CONSTANT_ND_3 = 0x3320646eU,
				CHACHA20_CONSTANT_2_BY = 0x79622d32U,
				CHACHA20_CONSTANT_TE_K = 0x6b206574U
				};

				struct chacha20_ctx {
				union {
				u32 state[16];
				struct {
				u32 constant[4];
				u32 key[8];
				u32 counter[4];
				};
				};
				};

				static inline void chacha20_init(struct chacha20_ctx *ctx,
				const u8 key[CHACHA20_KEY_SIZE],
				const u64 nonce)
				{
				ctx->constant[0] = CHACHA20_CONSTANT_EXPA;
				ctx->constant[1] = CHACHA20_CONSTANT_ND_3;
				ctx->constant[2] = CHACHA20_CONSTANT_2_BY;
				ctx->constant[3] = CHACHA20_CONSTANT_TE_K;
				ctx->key[0] = get_unaligned_le32(key + 0);
				ctx->key[1] = get_unaligned_le32(key + 4);
				ctx->key[2] = get_unaligned_le32(key + 8);
				ctx->key[3] = get_unaligned_le32(key + 12);
				ctx->key[4] = get_unaligned_le32(key + 16);
				ctx->key[5] = get_unaligned_le32(key + 20);
				ctx->key[6] = get_unaligned_le32(key + 24);
				ctx->key[7] = get_unaligned_le32(key + 28);
				ctx->counter[0] = 0;
				ctx->counter[1] = 0;
				ctx->counter[2] = nonce & U32_MAX;
				ctx->counter[3] = nonce >> 32;
				}
				void chacha20(struct chacha20_ctx ctx, u8 dst, const u8 *src, u32 len,
				simd_context_t *simd_context);

				void hchacha20(u32 derived_key[CHACHA20_KEY_WORDS],
				const u8 nonce[HCHACHA20_NONCE_SIZE],
				const u8 key[HCHACHA20_KEY_SIZE], simd_context_t *simd_context);

				#endif /* _ZINC_CHACHA20_H */