linux/include/crypto/sm3_base.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * sm3_base.h - core logic for SM3 implementations
   4 *
   5 * Copyright (C) 2017 ARM Limited or its affiliates.
   6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
   7 */
   8
   9#ifndef _CRYPTO_SM3_BASE_H
  10#define _CRYPTO_SM3_BASE_H
  11
  12#include <crypto/internal/hash.h>
  13#include <crypto/sm3.h>
  14#include <linux/crypto.h>
  15#include <linux/module.h>
  16#include <asm/unaligned.h>
  17
  18typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
  19
  20static inline int sm3_base_init(struct shash_desc *desc)
  21{
  22        struct sm3_state *sctx = shash_desc_ctx(desc);
  23
  24        sctx->state[0] = SM3_IVA;
  25        sctx->state[1] = SM3_IVB;
  26        sctx->state[2] = SM3_IVC;
  27        sctx->state[3] = SM3_IVD;
  28        sctx->state[4] = SM3_IVE;
  29        sctx->state[5] = SM3_IVF;
  30        sctx->state[6] = SM3_IVG;
  31        sctx->state[7] = SM3_IVH;
  32        sctx->count = 0;
  33
  34        return 0;
  35}
  36
  37static inline int sm3_base_do_update(struct shash_desc *desc,
  38                                      const u8 *data,
  39                                      unsigned int len,
  40                                      sm3_block_fn *block_fn)
  41{
  42        struct sm3_state *sctx = shash_desc_ctx(desc);
  43        unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
  44
  45        sctx->count += len;
  46
  47        if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
  48                int blocks;
  49
  50                if (partial) {
  51                        int p = SM3_BLOCK_SIZE - partial;
  52
  53                        memcpy(sctx->buffer + partial, data, p);
  54                        data += p;
  55                        len -= p;
  56
  57                        block_fn(sctx, sctx->buffer, 1);
  58                }
  59
  60                blocks = len / SM3_BLOCK_SIZE;
  61                len %= SM3_BLOCK_SIZE;
  62
  63                if (blocks) {
  64                        block_fn(sctx, data, blocks);
  65                        data += blocks * SM3_BLOCK_SIZE;
  66                }
  67                partial = 0;
  68        }
  69        if (len)
  70                memcpy(sctx->buffer + partial, data, len);
  71
  72        return 0;
  73}
  74
  75static inline int sm3_base_do_finalize(struct shash_desc *desc,
  76                                        sm3_block_fn *block_fn)
  77{
  78        const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
  79        struct sm3_state *sctx = shash_desc_ctx(desc);
  80        __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
  81        unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
  82
  83        sctx->buffer[partial++] = 0x80;
  84        if (partial > bit_offset) {
  85                memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
  86                partial = 0;
  87
  88                block_fn(sctx, sctx->buffer, 1);
  89        }
  90
  91        memset(sctx->buffer + partial, 0x0, bit_offset - partial);
  92        *bits = cpu_to_be64(sctx->count << 3);
  93        block_fn(sctx, sctx->buffer, 1);
  94
  95        return 0;
  96}
  97
  98static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
  99{
 100        struct sm3_state *sctx = shash_desc_ctx(desc);
 101        __be32 *digest = (__be32 *)out;
 102        int i;
 103
 104        for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
 105                put_unaligned_be32(sctx->state[i], digest++);
 106
 107        *sctx = (struct sm3_state){};
 108        return 0;
 109}
 110
 111#endif /* _CRYPTO_SM3_BASE_H */
 112