/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Helper functions for BLAKE2s implementations.
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* Keep this in sync with the corresponding BLAKE2b header.
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*/
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#ifndef _CRYPTO_INTERNAL_BLAKE2S_H
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#define _CRYPTO_INTERNAL_BLAKE2S_H
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#include <crypto/blake2s.h>
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#include <crypto/internal/hash.h>
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#include <linux/string.h>
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void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
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size_t nblocks, const u32 inc);
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void blake2s_compress(struct blake2s_state *state, const u8 *block,
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size_t nblocks, const u32 inc);
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bool blake2s_selftest(void);
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static inline void blake2s_set_lastblock(struct blake2s_state *state)
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{
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state->f[0] = -1;
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}
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/* Helper functions for BLAKE2s shared by the library and shash APIs */
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static __always_inline void
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__blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen,
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bool force_generic)
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{
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const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
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if (unlikely(!inlen))
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return;
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if (inlen > fill) {
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memcpy(state->buf + state->buflen, in, fill);
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if (force_generic)
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blake2s_compress_generic(state, state->buf, 1,
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BLAKE2S_BLOCK_SIZE);
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else
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blake2s_compress(state, state->buf, 1,
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BLAKE2S_BLOCK_SIZE);
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state->buflen = 0;
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in += fill;
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inlen -= fill;
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}
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if (inlen > BLAKE2S_BLOCK_SIZE) {
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const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
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/* Hash one less (full) block than strictly possible */
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if (force_generic)
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blake2s_compress_generic(state, in, nblocks - 1,
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BLAKE2S_BLOCK_SIZE);
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else
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blake2s_compress(state, in, nblocks - 1,
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BLAKE2S_BLOCK_SIZE);
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in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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}
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memcpy(state->buf + state->buflen, in, inlen);
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state->buflen += inlen;
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}
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static __always_inline void
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__blake2s_final(struct blake2s_state *state, u8 *out, bool force_generic)
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{
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blake2s_set_lastblock(state);
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memset(state->buf + state->buflen, 0,
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BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
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if (force_generic)
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blake2s_compress_generic(state, state->buf, 1, state->buflen);
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else
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blake2s_compress(state, state->buf, 1, state->buflen);
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cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
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memcpy(out, state->h, state->outlen);
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}
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/* Helper functions for shash implementations of BLAKE2s */
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struct blake2s_tfm_ctx {
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u8 key[BLAKE2S_KEY_SIZE];
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unsigned int keylen;
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};
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static inline int crypto_blake2s_setkey(struct crypto_shash *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
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if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
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return -EINVAL;
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memcpy(tctx->key, key, keylen);
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tctx->keylen = keylen;
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return 0;
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}
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static inline int crypto_blake2s_init(struct shash_desc *desc)
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{
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const struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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struct blake2s_state *state = shash_desc_ctx(desc);
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unsigned int outlen = crypto_shash_digestsize(desc->tfm);
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__blake2s_init(state, outlen, tctx->key, tctx->keylen);
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return 0;
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}
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static inline int crypto_blake2s_update(struct shash_desc *desc,
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const u8 *in, unsigned int inlen,
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bool force_generic)
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{
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struct blake2s_state *state = shash_desc_ctx(desc);
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__blake2s_update(state, in, inlen, force_generic);
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return 0;
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}
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static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
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bool force_generic)
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{
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struct blake2s_state *state = shash_desc_ctx(desc);
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__blake2s_final(state, out, force_generic);
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return 0;
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}
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#endif /* _CRYPTO_INTERNAL_BLAKE2S_H */
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