forked from Qortal/Brooklyn
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _ZINC_CHACHA20_H
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#define _ZINC_CHACHA20_H
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#include <asm/unaligned.h>
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#include <linux/simd.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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enum chacha20_lengths {
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CHACHA20_NONCE_SIZE = 16,
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CHACHA20_KEY_SIZE = 32,
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CHACHA20_KEY_WORDS = CHACHA20_KEY_SIZE / sizeof(u32),
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CHACHA20_BLOCK_SIZE = 64,
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CHACHA20_BLOCK_WORDS = CHACHA20_BLOCK_SIZE / sizeof(u32),
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HCHACHA20_NONCE_SIZE = CHACHA20_NONCE_SIZE,
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HCHACHA20_KEY_SIZE = CHACHA20_KEY_SIZE
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};
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enum chacha20_constants { /* expand 32-byte k */
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CHACHA20_CONSTANT_EXPA = 0x61707865U,
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CHACHA20_CONSTANT_ND_3 = 0x3320646eU,
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CHACHA20_CONSTANT_2_BY = 0x79622d32U,
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CHACHA20_CONSTANT_TE_K = 0x6b206574U
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};
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struct chacha20_ctx {
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union {
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u32 state[16];
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struct {
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u32 constant[4];
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u32 key[8];
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u32 counter[4];
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};
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};
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};
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static inline void chacha20_init(struct chacha20_ctx *ctx,
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const u8 key[CHACHA20_KEY_SIZE],
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const u64 nonce)
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{
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ctx->constant[0] = CHACHA20_CONSTANT_EXPA;
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ctx->constant[1] = CHACHA20_CONSTANT_ND_3;
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ctx->constant[2] = CHACHA20_CONSTANT_2_BY;
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ctx->constant[3] = CHACHA20_CONSTANT_TE_K;
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ctx->key[0] = get_unaligned_le32(key + 0);
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ctx->key[1] = get_unaligned_le32(key + 4);
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ctx->key[2] = get_unaligned_le32(key + 8);
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ctx->key[3] = get_unaligned_le32(key + 12);
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ctx->key[4] = get_unaligned_le32(key + 16);
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ctx->key[5] = get_unaligned_le32(key + 20);
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ctx->key[6] = get_unaligned_le32(key + 24);
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ctx->key[7] = get_unaligned_le32(key + 28);
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ctx->counter[0] = 0;
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ctx->counter[1] = 0;
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ctx->counter[2] = nonce & U32_MAX;
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ctx->counter[3] = nonce >> 32;
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}
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void chacha20(struct chacha20_ctx *ctx, u8 *dst, const u8 *src, u32 len,
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simd_context_t *simd_context);
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void hchacha20(u32 derived_key[CHACHA20_KEY_WORDS],
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const u8 nonce[HCHACHA20_NONCE_SIZE],
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const u8 key[HCHACHA20_KEY_SIZE], simd_context_t *simd_context);
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#endif /* _ZINC_CHACHA20_H */
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