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 #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
  15 typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
  16                                int blocks);
  17
  18 static 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
  35 static 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
  52 static 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
  92 static 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
 116 static 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 }