linux/include/crypto/sha512_base.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * sha512_base.h - core logic for SHA-512 implementations
   4 *
   5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   6 */
   7
   8#ifndef _CRYPTO_SHA512_BASE_H
   9#define _CRYPTO_SHA512_BASE_H
  10
  11#include <crypto/internal/hash.h>
  12#include <crypto/sha2.h>
  13#include <linux/crypto.h>
  14#include <linux/module.h>
  15#include <linux/string.h>
  16
  17#include <asm/unaligned.h>
  18
  19typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
  20                               int blocks);
  21
  22static inline int sha384_base_init(struct shash_desc *desc)
  23{
  24        struct sha512_state *sctx = shash_desc_ctx(desc);
  25
  26        sctx->state[0] = SHA384_H0;
  27        sctx->state[1] = SHA384_H1;
  28        sctx->state[2] = SHA384_H2;
  29        sctx->state[3] = SHA384_H3;
  30        sctx->state[4] = SHA384_H4;
  31        sctx->state[5] = SHA384_H5;
  32        sctx->state[6] = SHA384_H6;
  33        sctx->state[7] = SHA384_H7;
  34        sctx->count[0] = sctx->count[1] = 0;
  35
  36        return 0;
  37}
  38
  39static inline int sha512_base_init(struct shash_desc *desc)
  40{
  41        struct sha512_state *sctx = shash_desc_ctx(desc);
  42
  43        sctx->state[0] = SHA512_H0;
  44        sctx->state[1] = SHA512_H1;
  45        sctx->state[2] = SHA512_H2;
  46        sctx->state[3] = SHA512_H3;
  47        sctx->state[4] = SHA512_H4;
  48        sctx->state[5] = SHA512_H5;
  49        sctx->state[6] = SHA512_H6;
  50        sctx->state[7] = SHA512_H7;
  51        sctx->count[0] = sctx->count[1] = 0;
  52
  53        return 0;
  54}
  55
  56static inline int sha512_base_do_update(struct shash_desc *desc,
  57                                        const u8 *data,
  58                                        unsigned int len,
  59                                        sha512_block_fn *block_fn)
  60{
  61        struct sha512_state *sctx = shash_desc_ctx(desc);
  62        unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
  63
  64        sctx->count[0] += len;
  65        if (sctx->count[0] < len)
  66                sctx->count[1]++;
  67
  68        if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
  69                int blocks;
  70
  71                if (partial) {
  72                        int p = SHA512_BLOCK_SIZE - partial;
  73
  74                        memcpy(sctx->buf + partial, data, p);
  75                        data += p;
  76                        len -= p;
  77
  78                        block_fn(sctx, sctx->buf, 1);
  79                }
  80
  81                blocks = len / SHA512_BLOCK_SIZE;
  82                len %= SHA512_BLOCK_SIZE;
  83
  84                if (blocks) {
  85                        block_fn(sctx, data, blocks);
  86                        data += blocks * SHA512_BLOCK_SIZE;
  87                }
  88                partial = 0;
  89        }
  90        if (len)
  91                memcpy(sctx->buf + partial, data, len);
  92
  93        return 0;
  94}
  95
  96static inline int sha512_base_do_finalize(struct shash_desc *desc,
  97                                          sha512_block_fn *block_fn)
  98{
  99        const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
 100        struct sha512_state *sctx = shash_desc_ctx(desc);
 101        __be64 *bits = (__be64 *)(sctx->buf + bit_offset);
 102        unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
 103
 104        sctx->buf[partial++] = 0x80;
 105        if (partial > bit_offset) {
 106                memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
 107                partial = 0;
 108
 109                block_fn(sctx, sctx->buf, 1);
 110        }
 111
 112        memset(sctx->buf + partial, 0x0, bit_offset - partial);
 113        bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
 114        bits[1] = cpu_to_be64(sctx->count[0] << 3);
 115        block_fn(sctx, sctx->buf, 1);
 116
 117        return 0;
 118}
 119
 120static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
 121{
 122        unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
 123        struct sha512_state *sctx = shash_desc_ctx(desc);
 124        __be64 *digest = (__be64 *)out;
 125        int i;
 126
 127        for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
 128                put_unaligned_be64(sctx->state[i], digest++);
 129
 130        memzero_explicit(sctx, sizeof(*sctx));
 131        return 0;
 132}
 133
 134#endif /* _CRYPTO_SHA512_BASE_H */
 135
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