arch/mips/cavium-octeon/crypto/octeon-sha256.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API.
   4  *
   5  * SHA-224 and SHA-256 Secure Hash Algorithm.
   6  *
   7  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
   8  *
   9  * Based on crypto/sha256_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) 2002 James Morris <jmorris@intercode.com.au>
  14  * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
  15  */
  16
  17 #include <linux/mm.h>
  18 #include <crypto/sha2.h>
  19 #include <crypto/sha256_base.h>
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <asm/byteorder.h>
  24 #include <asm/octeon/octeon.h>
  25 #include <crypto/internal/hash.h>
  26
  27 #include "octeon-crypto.h"
  28
  29 /*
  30  * We pass everything as 64-bit. OCTEON can handle misaligned data.
  31  */
  32
  33 static void octeon_sha256_store_hash(struct sha256_state *sctx)
  34 {
  35         u64 *hash = (u64 *)sctx->state;
  36
  37         write_octeon_64bit_hash_dword(hash[0], 0);
  38         write_octeon_64bit_hash_dword(hash[1], 1);
  39         write_octeon_64bit_hash_dword(hash[2], 2);
  40         write_octeon_64bit_hash_dword(hash[3], 3);
  41 }
  42
  43 static void octeon_sha256_read_hash(struct sha256_state *sctx)
  44 {
  45         u64 *hash = (u64 *)sctx->state;
  46
  47         hash[0] = read_octeon_64bit_hash_dword(0);
  48         hash[1] = read_octeon_64bit_hash_dword(1);
  49         hash[2] = read_octeon_64bit_hash_dword(2);
  50         hash[3] = read_octeon_64bit_hash_dword(3);
  51 }
  52
  53 static void octeon_sha256_transform(const void *_block)
  54 {
  55         const u64 *block = _block;
  56
  57         write_octeon_64bit_block_dword(block[0], 0);
  58         write_octeon_64bit_block_dword(block[1], 1);
  59         write_octeon_64bit_block_dword(block[2], 2);
  60         write_octeon_64bit_block_dword(block[3], 3);
  61         write_octeon_64bit_block_dword(block[4], 4);
  62         write_octeon_64bit_block_dword(block[5], 5);
  63         write_octeon_64bit_block_dword(block[6], 6);
  64         octeon_sha256_start(block[7]);
  65 }
  66
  67 static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
  68                                    unsigned int len)
  69 {
  70         unsigned int partial;
  71         unsigned int done;
  72         const u8 *src;
  73
  74         partial = sctx->count % SHA256_BLOCK_SIZE;
  75         sctx->count += len;
  76         done = 0;
  77         src = data;
  78
  79         if ((partial + len) >= SHA256_BLOCK_SIZE) {
  80                 if (partial) {
  81                         done = -partial;
  82                         memcpy(sctx->buf + partial, data,
  83                                done + SHA256_BLOCK_SIZE);
  84                         src = sctx->buf;
  85                 }
  86
  87                 do {
  88                         octeon_sha256_transform(src);
  89                         done += SHA256_BLOCK_SIZE;
  90                         src = data + done;
  91                 } while (done + SHA256_BLOCK_SIZE <= len);
  92
  93                 partial = 0;
  94         }
  95         memcpy(sctx->buf + partial, src, len - done);
  96 }
  97
  98 static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
  99                                 unsigned int len)
 100 {
 101         struct sha256_state *sctx = shash_desc_ctx(desc);
 102         struct octeon_cop2_state state;
 103         unsigned long flags;
 104
 105         /*
 106          * Small updates never reach the crypto engine, so the generic sha256 is
 107          * faster because of the heavyweight octeon_crypto_enable() /
 108          * octeon_crypto_disable().
 109          */
 110         if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
 111                 return crypto_sha256_update(desc, data, len);
 112
 113         flags = octeon_crypto_enable(&state);
 114         octeon_sha256_store_hash(sctx);
 115
 116         __octeon_sha256_update(sctx, data, len);
 117
 118         octeon_sha256_read_hash(sctx);
 119         octeon_crypto_disable(&state, flags);
 120
 121         return 0;
 122 }
 123
 124 static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
 125 {
 126         struct sha256_state *sctx = shash_desc_ctx(desc);
 127         static const u8 padding[64] = { 0x80, };
 128         struct octeon_cop2_state state;
 129         __be32 *dst = (__be32 *)out;
 130         unsigned int pad_len;
 131         unsigned long flags;
 132         unsigned int index;
 133         __be64 bits;
 134         int i;
 135
 136         /* Save number of bits. */
 137         bits = cpu_to_be64(sctx->count << 3);
 138
 139         /* Pad out to 56 mod 64. */
 140         index = sctx->count & 0x3f;
 141         pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
 142
 143         flags = octeon_crypto_enable(&state);
 144         octeon_sha256_store_hash(sctx);
 145
 146         __octeon_sha256_update(sctx, padding, pad_len);
 147
 148         /* Append length (before padding). */
 149         __octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
 150
 151         octeon_sha256_read_hash(sctx);
 152         octeon_crypto_disable(&state, flags);
 153
 154         /* Store state in digest */
 155         for (i = 0; i < 8; i++)
 156                 dst[i] = cpu_to_be32(sctx->state[i]);
 157
 158         /* Zeroize sensitive information. */
 159         memset(sctx, 0, sizeof(*sctx));
 160
 161         return 0;
 162 }
 163
 164 static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
 165 {
 166         u8 D[SHA256_DIGEST_SIZE];
 167
 168         octeon_sha256_final(desc, D);
 169
 170         memcpy(hash, D, SHA224_DIGEST_SIZE);
 171         memzero_explicit(D, SHA256_DIGEST_SIZE);
 172
 173         return 0;
 174 }
 175
 176 static int octeon_sha256_export(struct shash_desc *desc, void *out)
 177 {
 178         struct sha256_state *sctx = shash_desc_ctx(desc);
 179
 180         memcpy(out, sctx, sizeof(*sctx));
 181         return 0;
 182 }
 183
 184 static int octeon_sha256_import(struct shash_desc *desc, const void *in)
 185 {
 186         struct sha256_state *sctx = shash_desc_ctx(desc);
 187
 188         memcpy(sctx, in, sizeof(*sctx));
 189         return 0;
 190 }
 191
 192 static struct shash_alg octeon_sha256_algs[2] = { {
 193         .digestsize     =       SHA256_DIGEST_SIZE,
 194         .init           =       sha256_base_init,
 195         .update         =       octeon_sha256_update,
 196         .final          =       octeon_sha256_final,
 197         .export         =       octeon_sha256_export,
 198         .import         =       octeon_sha256_import,
 199         .descsize       =       sizeof(struct sha256_state),
 200         .statesize      =       sizeof(struct sha256_state),
 201         .base           =       {
 202                 .cra_name       =       "sha256",
 203                 .cra_driver_name=       "octeon-sha256",
 204                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 205                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 206                 .cra_module     =       THIS_MODULE,
 207         }
 208 }, {
 209         .digestsize     =       SHA224_DIGEST_SIZE,
 210         .init           =       sha224_base_init,
 211         .update         =       octeon_sha256_update,
 212         .final          =       octeon_sha224_final,
 213         .descsize       =       sizeof(struct sha256_state),
 214         .base           =       {
 215                 .cra_name       =       "sha224",
 216                 .cra_driver_name=       "octeon-sha224",
 217                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 218                 .cra_module     =       THIS_MODULE,
 219         }
 220 } };
 221
 222 static int __init octeon_sha256_mod_init(void)
 223 {
 224         if (!octeon_has_crypto())
 225                 return -ENOTSUPP;
 226         return crypto_register_shashes(octeon_sha256_algs,
 227                                        ARRAY_SIZE(octeon_sha256_algs));
 228 }
 229
 230 static void __exit octeon_sha256_mod_fini(void)
 231 {
 232         crypto_unregister_shashes(octeon_sha256_algs,
 233                                   ARRAY_SIZE(octeon_sha256_algs));
 234 }
 235
 236 module_init(octeon_sha256_mod_init);
 237 module_exit(octeon_sha256_mod_fini);
 238
 239 MODULE_LICENSE("GPL");
 240 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
 241 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");