/* 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 _CRYPTO_BLAKE2S_H
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#define _CRYPTO_BLAKE2S_H
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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enum blake2s_lengths {
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BLAKE2S_BLOCK_SIZE = 64,
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BLAKE2S_HASH_SIZE = 32,
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BLAKE2S_KEY_SIZE = 32,
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BLAKE2S_128_HASH_SIZE = 16,
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BLAKE2S_160_HASH_SIZE = 20,
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BLAKE2S_224_HASH_SIZE = 28,
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BLAKE2S_256_HASH_SIZE = 32,
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};
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struct blake2s_state {
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/* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
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u32 h[8];
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u32 t[2];
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u32 f[2];
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u8 buf[BLAKE2S_BLOCK_SIZE];
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unsigned int buflen;
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unsigned int outlen;
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};
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enum blake2s_iv {
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BLAKE2S_IV0 = 0x6A09E667UL,
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BLAKE2S_IV1 = 0xBB67AE85UL,
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BLAKE2S_IV2 = 0x3C6EF372UL,
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BLAKE2S_IV3 = 0xA54FF53AUL,
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BLAKE2S_IV4 = 0x510E527FUL,
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BLAKE2S_IV5 = 0x9B05688CUL,
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BLAKE2S_IV6 = 0x1F83D9ABUL,
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BLAKE2S_IV7 = 0x5BE0CD19UL,
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};
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static inline void __blake2s_init(struct blake2s_state *state, size_t outlen,
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const void *key, size_t keylen)
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{
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state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen);
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state->h[1] = BLAKE2S_IV1;
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state->h[2] = BLAKE2S_IV2;
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state->h[3] = BLAKE2S_IV3;
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state->h[4] = BLAKE2S_IV4;
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state->h[5] = BLAKE2S_IV5;
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state->h[6] = BLAKE2S_IV6;
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state->h[7] = BLAKE2S_IV7;
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state->t[0] = 0;
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state->t[1] = 0;
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state->f[0] = 0;
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state->f[1] = 0;
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state->buflen = 0;
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state->outlen = outlen;
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if (keylen) {
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memcpy(state->buf, key, keylen);
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memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen);
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state->buflen = BLAKE2S_BLOCK_SIZE;
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}
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}
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static inline void blake2s_init(struct blake2s_state *state,
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const size_t outlen)
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{
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__blake2s_init(state, outlen, NULL, 0);
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}
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static inline void blake2s_init_key(struct blake2s_state *state,
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const size_t outlen, const void *key,
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const size_t keylen)
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{
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WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
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!key || !keylen || keylen > BLAKE2S_KEY_SIZE));
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__blake2s_init(state, outlen, key, keylen);
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}
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void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
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void blake2s_final(struct blake2s_state *state, u8 *out);
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static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
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const size_t outlen, const size_t inlen,
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const size_t keylen)
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{
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struct blake2s_state state;
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WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
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outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
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(!key && keylen)));
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__blake2s_init(&state, outlen, key, keylen);
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blake2s_update(&state, in, inlen);
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blake2s_final(&state, out);
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}
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#endif /* _CRYPTO_BLAKE2S_H */
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