arch/mips/cavium-octeon/crypto/octeon-sha1.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API.
   4  *
   5  * SHA1 Secure Hash Algorithm.
   6  *
   7  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
   8  *
   9  * Based on crypto/sha1_generic.c, which is:
  10  *
  11  * Copyright (c) Alan Smithee.
  12  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  13  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  14  */
  15
  16 #include <linux/mm.h>
  17 #include <crypto/sha1.h>
  18 #include <crypto/sha1_base.h>
  19 #include <linux/init.h>
  20 #include <linux/types.h>
  21 #include <linux/module.h>
  22 #include <asm/byteorder.h>
  23 #include <asm/octeon/octeon.h>
  24 #include <crypto/internal/hash.h>
  25
  26 #include "octeon-crypto.h"
  27
  28 /*
  29  * We pass everything as 64-bit. OCTEON can handle misaligned data.
  30  */
  31
  32 static void octeon_sha1_store_hash(struct sha1_state *sctx)
  33 {
  34         u64 *hash = (u64 *)sctx->state;
  35         union {
  36                 u32 word[2];
  37                 u64 dword;
  38         } hash_tail = { { sctx->state[4], } };
  39
  40         write_octeon_64bit_hash_dword(hash[0], 0);
  41         write_octeon_64bit_hash_dword(hash[1], 1);
  42         write_octeon_64bit_hash_dword(hash_tail.dword, 2);
  43         memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0]));
  44 }
  45
  46 static void octeon_sha1_read_hash(struct sha1_state *sctx)
  47 {
  48         u64 *hash = (u64 *)sctx->state;
  49         union {
  50                 u32 word[2];
  51                 u64 dword;
  52         } hash_tail;
  53
  54         hash[0]         = read_octeon_64bit_hash_dword(0);
  55         hash[1]         = read_octeon_64bit_hash_dword(1);
  56         hash_tail.dword = read_octeon_64bit_hash_dword(2);
  57         sctx->state[4]  = hash_tail.word[0];
  58         memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword));
  59 }
  60
  61 static void octeon_sha1_transform(const void *_block)
  62 {
  63         const u64 *block = _block;
  64
  65         write_octeon_64bit_block_dword(block[0], 0);
  66         write_octeon_64bit_block_dword(block[1], 1);
  67         write_octeon_64bit_block_dword(block[2], 2);
  68         write_octeon_64bit_block_dword(block[3], 3);
  69         write_octeon_64bit_block_dword(block[4], 4);
  70         write_octeon_64bit_block_dword(block[5], 5);
  71         write_octeon_64bit_block_dword(block[6], 6);
  72         octeon_sha1_start(block[7]);
  73 }
  74
  75 static void __octeon_sha1_update(struct sha1_state *sctx, const u8 *data,
  76                                  unsigned int len)
  77 {
  78         unsigned int partial;
  79         unsigned int done;
  80         const u8 *src;
  81
  82         partial = sctx->count % SHA1_BLOCK_SIZE;
  83         sctx->count += len;
  84         done = 0;
  85         src = data;
  86
  87         if ((partial + len) >= SHA1_BLOCK_SIZE) {
  88                 if (partial) {
  89                         done = -partial;
  90                         memcpy(sctx->buffer + partial, data,
  91                                done + SHA1_BLOCK_SIZE);
  92                         src = sctx->buffer;
  93                 }
  94
  95                 do {
  96                         octeon_sha1_transform(src);
  97                         done += SHA1_BLOCK_SIZE;
  98                         src = data + done;
  99                 } while (done + SHA1_BLOCK_SIZE <= len);
 100
 101                 partial = 0;
 102         }
 103         memcpy(sctx->buffer + partial, src, len - done);
 104 }
 105
 106 static int octeon_sha1_update(struct shash_desc *desc, const u8 *data,
 107                         unsigned int len)
 108 {
 109         struct sha1_state *sctx = shash_desc_ctx(desc);
 110         struct octeon_cop2_state state;
 111         unsigned long flags;
 112
 113         /*
 114          * Small updates never reach the crypto engine, so the generic sha1 is
 115          * faster because of the heavyweight octeon_crypto_enable() /
 116          * octeon_crypto_disable().
 117          */
 118         if ((sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
 119                 return crypto_sha1_update(desc, data, len);
 120
 121         flags = octeon_crypto_enable(&state);
 122         octeon_sha1_store_hash(sctx);
 123
 124         __octeon_sha1_update(sctx, data, len);
 125
 126         octeon_sha1_read_hash(sctx);
 127         octeon_crypto_disable(&state, flags);
 128
 129         return 0;
 130 }
 131
 132 static int octeon_sha1_final(struct shash_desc *desc, u8 *out)
 133 {
 134         struct sha1_state *sctx = shash_desc_ctx(desc);
 135         static const u8 padding[64] = { 0x80, };
 136         struct octeon_cop2_state state;
 137         __be32 *dst = (__be32 *)out;
 138         unsigned int pad_len;
 139         unsigned long flags;
 140         unsigned int index;
 141         __be64 bits;
 142         int i;
 143
 144         /* Save number of bits. */
 145         bits = cpu_to_be64(sctx->count << 3);
 146
 147         /* Pad out to 56 mod 64. */
 148         index = sctx->count & 0x3f;
 149         pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
 150
 151         flags = octeon_crypto_enable(&state);
 152         octeon_sha1_store_hash(sctx);
 153
 154         __octeon_sha1_update(sctx, padding, pad_len);
 155
 156         /* Append length (before padding). */
 157         __octeon_sha1_update(sctx, (const u8 *)&bits, sizeof(bits));
 158
 159         octeon_sha1_read_hash(sctx);
 160         octeon_crypto_disable(&state, flags);
 161
 162         /* Store state in digest */
 163         for (i = 0; i < 5; i++)
 164                 dst[i] = cpu_to_be32(sctx->state[i]);
 165
 166         /* Zeroize sensitive information. */
 167         memset(sctx, 0, sizeof(*sctx));
 168
 169         return 0;
 170 }
 171
 172 static int octeon_sha1_export(struct shash_desc *desc, void *out)
 173 {
 174         struct sha1_state *sctx = shash_desc_ctx(desc);
 175
 176         memcpy(out, sctx, sizeof(*sctx));
 177         return 0;
 178 }
 179
 180 static int octeon_sha1_import(struct shash_desc *desc, const void *in)
 181 {
 182         struct sha1_state *sctx = shash_desc_ctx(desc);
 183
 184         memcpy(sctx, in, sizeof(*sctx));
 185         return 0;
 186 }
 187
 188 static struct shash_alg octeon_sha1_alg = {
 189         .digestsize     =       SHA1_DIGEST_SIZE,
 190         .init           =       sha1_base_init,
 191         .update         =       octeon_sha1_update,
 192         .final          =       octeon_sha1_final,
 193         .export         =       octeon_sha1_export,
 194         .import         =       octeon_sha1_import,
 195         .descsize       =       sizeof(struct sha1_state),
 196         .statesize      =       sizeof(struct sha1_state),
 197         .base           =       {
 198                 .cra_name       =       "sha1",
 199                 .cra_driver_name=       "octeon-sha1",
 200                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 201                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 202                 .cra_module     =       THIS_MODULE,
 203         }
 204 };
 205
 206 static int __init octeon_sha1_mod_init(void)
 207 {
 208         if (!octeon_has_crypto())
 209                 return -ENOTSUPP;
 210         return crypto_register_shash(&octeon_sha1_alg);
 211 }
 212
 213 static void __exit octeon_sha1_mod_fini(void)
 214 {
 215         crypto_unregister_shash(&octeon_sha1_alg);
 216 }
 217
 218 module_init(octeon_sha1_mod_init);
 219 module_exit(octeon_sha1_mod_fini);
 220
 221 MODULE_LICENSE("GPL");
 222 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (OCTEON)");
 223 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");