LXR linux/include/crypto/sha512

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