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23a16c9533
Add a library API for BLAKE2b, closely modeled after the BLAKE2s API. This will allow in-kernel users such as btrfs to use BLAKE2b without going through the generic crypto layer. In addition, as usual the BLAKE2b crypto_shash algorithms will be reimplemented on top of this. Note: to create lib/crypto/blake2b.c I made a copy of lib/crypto/blake2s.c and made the updates from BLAKE2s => BLAKE2b. This way, the BLAKE2s and BLAKE2b code is kept consistent. Therefore, it borrows the SPDX-License-Identifier and Copyright from lib/crypto/blake2s.c rather than crypto/blake2b_generic.c. The library API uses 'struct blake2b_ctx', consistent with other lib/crypto/ APIs. The existing 'struct blake2b_state' will be removed once the blake2b crypto_shash algorithms are updated to stop using it. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20251018043106.375964-7-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Helper functions for BLAKE2b implementations.
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* Keep this in sync with the corresponding BLAKE2s header.
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*/
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#ifndef _CRYPTO_INTERNAL_BLAKE2B_H
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#define _CRYPTO_INTERNAL_BLAKE2B_H
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#include <asm/byteorder.h>
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#include <crypto/blake2b.h>
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#include <crypto/internal/hash.h>
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#include <linux/array_size.h>
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#include <linux/compiler.h>
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#include <linux/build_bug.h>
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#include <linux/errno.h>
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#include <linux/math.h>
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#include <linux/string.h>
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#include <linux/types.h>
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static inline void blake2b_set_lastblock(struct blake2b_state *state)
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{
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state->f[0] = -1;
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state->f[1] = 0;
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}
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static inline void blake2b_set_nonlast(struct blake2b_state *state)
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{
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state->f[0] = 0;
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state->f[1] = 0;
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}
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typedef void (*blake2b_compress_t)(struct blake2b_state *state,
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const u8 *block, size_t nblocks, u32 inc);
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/* Helper functions for shash implementations of BLAKE2b */
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struct blake2b_tfm_ctx {
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u8 key[BLAKE2B_BLOCK_SIZE];
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unsigned int keylen;
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};
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static inline int crypto_blake2b_setkey(struct crypto_shash *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
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if (keylen > BLAKE2B_KEY_SIZE)
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return -EINVAL;
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BUILD_BUG_ON(BLAKE2B_KEY_SIZE > BLAKE2B_BLOCK_SIZE);
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memcpy(tctx->key, key, keylen);
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memset(tctx->key + keylen, 0, BLAKE2B_BLOCK_SIZE - keylen);
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tctx->keylen = keylen;
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return 0;
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}
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static inline void __crypto_blake2b_init(struct blake2b_state *state,
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size_t outlen, size_t keylen)
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{
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state->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen);
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state->h[1] = BLAKE2B_IV1;
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state->h[2] = BLAKE2B_IV2;
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state->h[3] = BLAKE2B_IV3;
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state->h[4] = BLAKE2B_IV4;
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state->h[5] = BLAKE2B_IV5;
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state->h[6] = BLAKE2B_IV6;
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state->h[7] = BLAKE2B_IV7;
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state->t[0] = 0;
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state->t[1] = 0;
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}
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static inline int crypto_blake2b_init(struct shash_desc *desc)
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{
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const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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struct blake2b_state *state = shash_desc_ctx(desc);
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unsigned int outlen = crypto_shash_digestsize(desc->tfm);
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__crypto_blake2b_init(state, outlen, tctx->keylen);
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return tctx->keylen ?
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crypto_shash_update(desc, tctx->key, BLAKE2B_BLOCK_SIZE) : 0;
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}
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static inline int crypto_blake2b_update_bo(struct shash_desc *desc,
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const u8 *in, unsigned int inlen,
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blake2b_compress_t compress)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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blake2b_set_nonlast(state);
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compress(state, in, inlen / BLAKE2B_BLOCK_SIZE, BLAKE2B_BLOCK_SIZE);
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return inlen - round_down(inlen, BLAKE2B_BLOCK_SIZE);
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}
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static inline int crypto_blake2b_finup(struct shash_desc *desc, const u8 *in,
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unsigned int inlen, u8 *out,
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blake2b_compress_t compress)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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u8 buf[BLAKE2B_BLOCK_SIZE];
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int i;
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memcpy(buf, in, inlen);
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memset(buf + inlen, 0, BLAKE2B_BLOCK_SIZE - inlen);
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blake2b_set_lastblock(state);
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compress(state, buf, 1, inlen);
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for (i = 0; i < ARRAY_SIZE(state->h); i++)
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__cpu_to_le64s(&state->h[i]);
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memcpy(out, state->h, crypto_shash_digestsize(desc->tfm));
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memzero_explicit(buf, sizeof(buf));
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return 0;
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}
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#endif /* _CRYPTO_INTERNAL_BLAKE2B_H */
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