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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 */ |