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1/* SPDX-License-Identifier: GPL-2.0 OR MIT */2/*3 * Helper functions for BLAKE2b implementations.4 * Keep this in sync with the corresponding BLAKE2s header.5 */6 7#ifndef _CRYPTO_INTERNAL_BLAKE2B_H8#define _CRYPTO_INTERNAL_BLAKE2B_H9 10#include <crypto/blake2b.h>11#include <crypto/internal/hash.h>12#include <linux/string.h>13 14void blake2b_compress_generic(struct blake2b_state *state,15 const u8 *block, size_t nblocks, u32 inc);16 17static inline void blake2b_set_lastblock(struct blake2b_state *state)18{19 state->f[0] = -1;20}21 22typedef void (*blake2b_compress_t)(struct blake2b_state *state,23 const u8 *block, size_t nblocks, u32 inc);24 25static inline void __blake2b_update(struct blake2b_state *state,26 const u8 *in, size_t inlen,27 blake2b_compress_t compress)28{29 const size_t fill = BLAKE2B_BLOCK_SIZE - state->buflen;30 31 if (unlikely(!inlen))32 return;33 if (inlen > fill) {34 memcpy(state->buf + state->buflen, in, fill);35 (*compress)(state, state->buf, 1, BLAKE2B_BLOCK_SIZE);36 state->buflen = 0;37 in += fill;38 inlen -= fill;39 }40 if (inlen > BLAKE2B_BLOCK_SIZE) {41 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2B_BLOCK_SIZE);42 /* Hash one less (full) block than strictly possible */43 (*compress)(state, in, nblocks - 1, BLAKE2B_BLOCK_SIZE);44 in += BLAKE2B_BLOCK_SIZE * (nblocks - 1);45 inlen -= BLAKE2B_BLOCK_SIZE * (nblocks - 1);46 }47 memcpy(state->buf + state->buflen, in, inlen);48 state->buflen += inlen;49}50 51static inline void __blake2b_final(struct blake2b_state *state, u8 *out,52 blake2b_compress_t compress)53{54 int i;55 56 blake2b_set_lastblock(state);57 memset(state->buf + state->buflen, 0,58 BLAKE2B_BLOCK_SIZE - state->buflen); /* Padding */59 (*compress)(state, state->buf, 1, state->buflen);60 for (i = 0; i < ARRAY_SIZE(state->h); i++)61 __cpu_to_le64s(&state->h[i]);62 memcpy(out, state->h, state->outlen);63}64 65/* Helper functions for shash implementations of BLAKE2b */66 67struct blake2b_tfm_ctx {68 u8 key[BLAKE2B_KEY_SIZE];69 unsigned int keylen;70};71 72static inline int crypto_blake2b_setkey(struct crypto_shash *tfm,73 const u8 *key, unsigned int keylen)74{75 struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);76 77 if (keylen == 0 || keylen > BLAKE2B_KEY_SIZE)78 return -EINVAL;79 80 memcpy(tctx->key, key, keylen);81 tctx->keylen = keylen;82 83 return 0;84}85 86static inline int crypto_blake2b_init(struct shash_desc *desc)87{88 const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);89 struct blake2b_state *state = shash_desc_ctx(desc);90 unsigned int outlen = crypto_shash_digestsize(desc->tfm);91 92 __blake2b_init(state, outlen, tctx->key, tctx->keylen);93 return 0;94}95 96static inline int crypto_blake2b_update(struct shash_desc *desc,97 const u8 *in, unsigned int inlen,98 blake2b_compress_t compress)99{100 struct blake2b_state *state = shash_desc_ctx(desc);101 102 __blake2b_update(state, in, inlen, compress);103 return 0;104}105 106static inline int crypto_blake2b_final(struct shash_desc *desc, u8 *out,107 blake2b_compress_t compress)108{109 struct blake2b_state *state = shash_desc_ctx(desc);110 111 __blake2b_final(state, out, compress);112 return 0;113}114 115#endif /* _CRYPTO_INTERNAL_BLAKE2B_H */116