include/crypto/sha512_base.h

   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
  19 typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
  20                                int blocks);
  21
  22 static 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
  39 static 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
  56 static 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
  96 static 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
 120 static 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 */