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458c0480dc
Without the barrier_data() inside memzero_explicit(), the compiler may optimize away the state-clearing if it can tell that the state is not used afterwards. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* sm3_base.h - core logic for SM3 implementations
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*
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* Copyright (C) 2017 ARM Limited or its affiliates.
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* Written by Gilad Ben-Yossef <gilad@benyossef.com>
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*/
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#ifndef _CRYPTO_SM3_BASE_H
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#define _CRYPTO_SM3_BASE_H
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#include <crypto/internal/hash.h>
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#include <crypto/sm3.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/unaligned.h>
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typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
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static inline int sm3_base_init(struct shash_desc *desc)
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{
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struct sm3_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SM3_IVA;
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sctx->state[1] = SM3_IVB;
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sctx->state[2] = SM3_IVC;
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sctx->state[3] = SM3_IVD;
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sctx->state[4] = SM3_IVE;
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sctx->state[5] = SM3_IVF;
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sctx->state[6] = SM3_IVG;
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sctx->state[7] = SM3_IVH;
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sctx->count = 0;
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return 0;
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}
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static inline int sm3_base_do_update(struct shash_desc *desc,
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const u8 *data,
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unsigned int len,
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sm3_block_fn *block_fn)
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{
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struct sm3_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
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sctx->count += len;
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if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
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int blocks;
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if (partial) {
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int p = SM3_BLOCK_SIZE - partial;
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memcpy(sctx->buffer + partial, data, p);
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data += p;
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len -= p;
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block_fn(sctx, sctx->buffer, 1);
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}
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blocks = len / SM3_BLOCK_SIZE;
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len %= SM3_BLOCK_SIZE;
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if (blocks) {
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block_fn(sctx, data, blocks);
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data += blocks * SM3_BLOCK_SIZE;
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}
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partial = 0;
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}
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if (len)
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memcpy(sctx->buffer + partial, data, len);
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return 0;
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}
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static inline int sm3_base_do_finalize(struct shash_desc *desc,
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sm3_block_fn *block_fn)
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{
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const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
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struct sm3_state *sctx = shash_desc_ctx(desc);
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__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
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unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
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sctx->buffer[partial++] = 0x80;
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if (partial > bit_offset) {
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memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
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partial = 0;
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block_fn(sctx, sctx->buffer, 1);
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}
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memset(sctx->buffer + partial, 0x0, bit_offset - partial);
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*bits = cpu_to_be64(sctx->count << 3);
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block_fn(sctx, sctx->buffer, 1);
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return 0;
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}
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static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
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{
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struct sm3_state *sctx = shash_desc_ctx(desc);
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__be32 *digest = (__be32 *)out;
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int i;
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for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], digest++);
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memzero_explicit(sctx, sizeof(*sctx));
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return 0;
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}
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#endif /* _CRYPTO_SM3_BASE_H */
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