arch/mips/cavium-octeon/crypto/octeon-sha512.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API.
   4  *
   5  * SHA-512 and SHA-384 Secure Hash Algorithm.
   6  *
   7  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
   8  *
   9  * Based on crypto/sha512_generic.c, which is:
  10  *
  11  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  12  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  13  * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
  14  */
  15
  16 #include <linux/mm.h>
  17 #include <crypto/sha2.h>
  18 #include <linux/init.h>
  19 #include <linux/types.h>
  20 #include <linux/module.h>
  21 #include <asm/byteorder.h>
  22 #include <asm/octeon/octeon.h>
  23 #include <crypto/internal/hash.h>
  24
  25 #include "octeon-crypto.h"
  26
  27 /*
  28  * We pass everything as 64-bit. OCTEON can handle misaligned data.
  29  */
  30
  31 static void octeon_sha512_store_hash(struct sha512_state *sctx)
  32 {
  33         write_octeon_64bit_hash_sha512(sctx->state[0], 0);
  34         write_octeon_64bit_hash_sha512(sctx->state[1], 1);
  35         write_octeon_64bit_hash_sha512(sctx->state[2], 2);
  36         write_octeon_64bit_hash_sha512(sctx->state[3], 3);
  37         write_octeon_64bit_hash_sha512(sctx->state[4], 4);
  38         write_octeon_64bit_hash_sha512(sctx->state[5], 5);
  39         write_octeon_64bit_hash_sha512(sctx->state[6], 6);
  40         write_octeon_64bit_hash_sha512(sctx->state[7], 7);
  41 }
  42
  43 static void octeon_sha512_read_hash(struct sha512_state *sctx)
  44 {
  45         sctx->state[0] = read_octeon_64bit_hash_sha512(0);
  46         sctx->state[1] = read_octeon_64bit_hash_sha512(1);
  47         sctx->state[2] = read_octeon_64bit_hash_sha512(2);
  48         sctx->state[3] = read_octeon_64bit_hash_sha512(3);
  49         sctx->state[4] = read_octeon_64bit_hash_sha512(4);
  50         sctx->state[5] = read_octeon_64bit_hash_sha512(5);
  51         sctx->state[6] = read_octeon_64bit_hash_sha512(6);
  52         sctx->state[7] = read_octeon_64bit_hash_sha512(7);
  53 }
  54
  55 static void octeon_sha512_transform(const void *_block)
  56 {
  57         const u64 *block = _block;
  58
  59         write_octeon_64bit_block_sha512(block[0], 0);
  60         write_octeon_64bit_block_sha512(block[1], 1);
  61         write_octeon_64bit_block_sha512(block[2], 2);
  62         write_octeon_64bit_block_sha512(block[3], 3);
  63         write_octeon_64bit_block_sha512(block[4], 4);
  64         write_octeon_64bit_block_sha512(block[5], 5);
  65         write_octeon_64bit_block_sha512(block[6], 6);
  66         write_octeon_64bit_block_sha512(block[7], 7);
  67         write_octeon_64bit_block_sha512(block[8], 8);
  68         write_octeon_64bit_block_sha512(block[9], 9);
  69         write_octeon_64bit_block_sha512(block[10], 10);
  70         write_octeon_64bit_block_sha512(block[11], 11);
  71         write_octeon_64bit_block_sha512(block[12], 12);
  72         write_octeon_64bit_block_sha512(block[13], 13);
  73         write_octeon_64bit_block_sha512(block[14], 14);
  74         octeon_sha512_start(block[15]);
  75 }
  76
  77 static int octeon_sha512_init(struct shash_desc *desc)
  78 {
  79         struct sha512_state *sctx = shash_desc_ctx(desc);
  80
  81         sctx->state[0] = SHA512_H0;
  82         sctx->state[1] = SHA512_H1;
  83         sctx->state[2] = SHA512_H2;
  84         sctx->state[3] = SHA512_H3;
  85         sctx->state[4] = SHA512_H4;
  86         sctx->state[5] = SHA512_H5;
  87         sctx->state[6] = SHA512_H6;
  88         sctx->state[7] = SHA512_H7;
  89         sctx->count[0] = sctx->count[1] = 0;
  90
  91         return 0;
  92 }
  93
  94 static int octeon_sha384_init(struct shash_desc *desc)
  95 {
  96         struct sha512_state *sctx = shash_desc_ctx(desc);
  97
  98         sctx->state[0] = SHA384_H0;
  99         sctx->state[1] = SHA384_H1;
 100         sctx->state[2] = SHA384_H2;
 101         sctx->state[3] = SHA384_H3;
 102         sctx->state[4] = SHA384_H4;
 103         sctx->state[5] = SHA384_H5;
 104         sctx->state[6] = SHA384_H6;
 105         sctx->state[7] = SHA384_H7;
 106         sctx->count[0] = sctx->count[1] = 0;
 107
 108         return 0;
 109 }
 110
 111 static void __octeon_sha512_update(struct sha512_state *sctx, const u8 *data,
 112                                    unsigned int len)
 113 {
 114         unsigned int part_len;
 115         unsigned int index;
 116         unsigned int i;
 117
 118         /* Compute number of bytes mod 128. */
 119         index = sctx->count[0] % SHA512_BLOCK_SIZE;
 120
 121         /* Update number of bytes. */
 122         if ((sctx->count[0] += len) < len)
 123                 sctx->count[1]++;
 124
 125         part_len = SHA512_BLOCK_SIZE - index;
 126
 127         /* Transform as many times as possible. */
 128         if (len >= part_len) {
 129                 memcpy(&sctx->buf[index], data, part_len);
 130                 octeon_sha512_transform(sctx->buf);
 131
 132                 for (i = part_len; i + SHA512_BLOCK_SIZE <= len;
 133                         i += SHA512_BLOCK_SIZE)
 134                         octeon_sha512_transform(&data[i]);
 135
 136                 index = 0;
 137         } else {
 138                 i = 0;
 139         }
 140
 141         /* Buffer remaining input. */
 142         memcpy(&sctx->buf[index], &data[i], len - i);
 143 }
 144
 145 static int octeon_sha512_update(struct shash_desc *desc, const u8 *data,
 146                                 unsigned int len)
 147 {
 148         struct sha512_state *sctx = shash_desc_ctx(desc);
 149         struct octeon_cop2_state state;
 150         unsigned long flags;
 151
 152         /*
 153          * Small updates never reach the crypto engine, so the generic sha512 is
 154          * faster because of the heavyweight octeon_crypto_enable() /
 155          * octeon_crypto_disable().
 156          */
 157         if ((sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
 158                 return crypto_sha512_update(desc, data, len);
 159
 160         flags = octeon_crypto_enable(&state);
 161         octeon_sha512_store_hash(sctx);
 162
 163         __octeon_sha512_update(sctx, data, len);
 164
 165         octeon_sha512_read_hash(sctx);
 166         octeon_crypto_disable(&state, flags);
 167
 168         return 0;
 169 }
 170
 171 static int octeon_sha512_final(struct shash_desc *desc, u8 *hash)
 172 {
 173         struct sha512_state *sctx = shash_desc_ctx(desc);
 174         static u8 padding[128] = { 0x80, };
 175         struct octeon_cop2_state state;
 176         __be64 *dst = (__be64 *)hash;
 177         unsigned int pad_len;
 178         unsigned long flags;
 179         unsigned int index;
 180         __be64 bits[2];
 181         int i;
 182
 183         /* Save number of bits. */
 184         bits[1] = cpu_to_be64(sctx->count[0] << 3);
 185         bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
 186
 187         /* Pad out to 112 mod 128. */
 188         index = sctx->count[0] & 0x7f;
 189         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 190
 191         flags = octeon_crypto_enable(&state);
 192         octeon_sha512_store_hash(sctx);
 193
 194         __octeon_sha512_update(sctx, padding, pad_len);
 195
 196         /* Append length (before padding). */
 197         __octeon_sha512_update(sctx, (const u8 *)bits, sizeof(bits));
 198
 199         octeon_sha512_read_hash(sctx);
 200         octeon_crypto_disable(&state, flags);
 201
 202         /* Store state in digest. */
 203         for (i = 0; i < 8; i++)
 204                 dst[i] = cpu_to_be64(sctx->state[i]);
 205
 206         /* Zeroize sensitive information. */
 207         memset(sctx, 0, sizeof(struct sha512_state));
 208
 209         return 0;
 210 }
 211
 212 static int octeon_sha384_final(struct shash_desc *desc, u8 *hash)
 213 {
 214         u8 D[64];
 215
 216         octeon_sha512_final(desc, D);
 217
 218         memcpy(hash, D, 48);
 219         memzero_explicit(D, 64);
 220
 221         return 0;
 222 }
 223
 224 static struct shash_alg octeon_sha512_algs[2] = { {
 225         .digestsize     =       SHA512_DIGEST_SIZE,
 226         .init           =       octeon_sha512_init,
 227         .update         =       octeon_sha512_update,
 228         .final          =       octeon_sha512_final,
 229         .descsize       =       sizeof(struct sha512_state),
 230         .base           =       {
 231                 .cra_name       =       "sha512",
 232                 .cra_driver_name=       "octeon-sha512",
 233                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 234                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 235                 .cra_module     =       THIS_MODULE,
 236         }
 237 }, {
 238         .digestsize     =       SHA384_DIGEST_SIZE,
 239         .init           =       octeon_sha384_init,
 240         .update         =       octeon_sha512_update,
 241         .final          =       octeon_sha384_final,
 242         .descsize       =       sizeof(struct sha512_state),
 243         .base           =       {
 244                 .cra_name       =       "sha384",
 245                 .cra_driver_name=       "octeon-sha384",
 246                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 247                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 248                 .cra_module     =       THIS_MODULE,
 249         }
 250 } };
 251
 252 static int __init octeon_sha512_mod_init(void)
 253 {
 254         if (!octeon_has_crypto())
 255                 return -ENOTSUPP;
 256         return crypto_register_shashes(octeon_sha512_algs,
 257                                        ARRAY_SIZE(octeon_sha512_algs));
 258 }
 259
 260 static void __exit octeon_sha512_mod_fini(void)
 261 {
 262         crypto_unregister_shashes(octeon_sha512_algs,
 263                                   ARRAY_SIZE(octeon_sha512_algs));
 264 }
 265
 266 module_init(octeon_sha512_mod_init);
 267 module_exit(octeon_sha512_mod_fini);
 268
 269 MODULE_LICENSE("GPL");
 270 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
 271 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");