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 <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_sha256_store_hash(struct sha256_state *sctx)
  33 {
  34         u64 *hash = (u64 *)sctx->state;
  35
  36         write_octeon_64bit_hash_dword(hash[0], 0);
  37         write_octeon_64bit_hash_dword(hash[1], 1);
  38         write_octeon_64bit_hash_dword(hash[2], 2);
  39         write_octeon_64bit_hash_dword(hash[3], 3);
  40 }
  41
  42 static void octeon_sha256_read_hash(struct sha256_state *sctx)
  43 {
  44         u64 *hash = (u64 *)sctx->state;
  45
  46         hash[0] = read_octeon_64bit_hash_dword(0);
  47         hash[1] = read_octeon_64bit_hash_dword(1);
  48         hash[2] = read_octeon_64bit_hash_dword(2);
  49         hash[3] = read_octeon_64bit_hash_dword(3);
  50 }
  51
  52 static void octeon_sha256_transform(const void *_block)
  53 {
  54         const u64 *block = _block;
  55
  56         write_octeon_64bit_block_dword(block[0], 0);
  57         write_octeon_64bit_block_dword(block[1], 1);
  58         write_octeon_64bit_block_dword(block[2], 2);
  59         write_octeon_64bit_block_dword(block[3], 3);
  60         write_octeon_64bit_block_dword(block[4], 4);
  61         write_octeon_64bit_block_dword(block[5], 5);
  62         write_octeon_64bit_block_dword(block[6], 6);
  63         octeon_sha256_start(block[7]);
  64 }
  65
  66 static int octeon_sha224_init(struct shash_desc *desc)
  67 {
  68         struct sha256_state *sctx = shash_desc_ctx(desc);
  69
  70         sctx->state[0] = SHA224_H0;
  71         sctx->state[1] = SHA224_H1;
  72         sctx->state[2] = SHA224_H2;
  73         sctx->state[3] = SHA224_H3;
  74         sctx->state[4] = SHA224_H4;
  75         sctx->state[5] = SHA224_H5;
  76         sctx->state[6] = SHA224_H6;
  77         sctx->state[7] = SHA224_H7;
  78         sctx->count = 0;
  79
  80         return 0;
  81 }
  82
  83 static int octeon_sha256_init(struct shash_desc *desc)
  84 {
  85         struct sha256_state *sctx = shash_desc_ctx(desc);
  86
  87         sctx->state[0] = SHA256_H0;
  88         sctx->state[1] = SHA256_H1;
  89         sctx->state[2] = SHA256_H2;
  90         sctx->state[3] = SHA256_H3;
  91         sctx->state[4] = SHA256_H4;
  92         sctx->state[5] = SHA256_H5;
  93         sctx->state[6] = SHA256_H6;
  94         sctx->state[7] = SHA256_H7;
  95         sctx->count = 0;
  96
  97         return 0;
  98 }
  99
 100 static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
 101                                    unsigned int len)
 102 {
 103         unsigned int partial;
 104         unsigned int done;
 105         const u8 *src;
 106
 107         partial = sctx->count % SHA256_BLOCK_SIZE;
 108         sctx->count += len;
 109         done = 0;
 110         src = data;
 111
 112         if ((partial + len) >= SHA256_BLOCK_SIZE) {
 113                 if (partial) {
 114                         done = -partial;
 115                         memcpy(sctx->buf + partial, data,
 116                                done + SHA256_BLOCK_SIZE);
 117                         src = sctx->buf;
 118                 }
 119
 120                 do {
 121                         octeon_sha256_transform(src);
 122                         done += SHA256_BLOCK_SIZE;
 123                         src = data + done;
 124                 } while (done + SHA256_BLOCK_SIZE <= len);
 125
 126                 partial = 0;
 127         }
 128         memcpy(sctx->buf + partial, src, len - done);
 129 }
 130
 131 static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
 132                                 unsigned int len)
 133 {
 134         struct sha256_state *sctx = shash_desc_ctx(desc);
 135         struct octeon_cop2_state state;
 136         unsigned long flags;
 137
 138         /*
 139          * Small updates never reach the crypto engine, so the generic sha256 is
 140          * faster because of the heavyweight octeon_crypto_enable() /
 141          * octeon_crypto_disable().
 142          */
 143         if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
 144                 return crypto_sha256_update(desc, data, len);
 145
 146         flags = octeon_crypto_enable(&state);
 147         octeon_sha256_store_hash(sctx);
 148
 149         __octeon_sha256_update(sctx, data, len);
 150
 151         octeon_sha256_read_hash(sctx);
 152         octeon_crypto_disable(&state, flags);
 153
 154         return 0;
 155 }
 156
 157 static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
 158 {
 159         struct sha256_state *sctx = shash_desc_ctx(desc);
 160         static const u8 padding[64] = { 0x80, };
 161         struct octeon_cop2_state state;
 162         __be32 *dst = (__be32 *)out;
 163         unsigned int pad_len;
 164         unsigned long flags;
 165         unsigned int index;
 166         __be64 bits;
 167         int i;
 168
 169         /* Save number of bits. */
 170         bits = cpu_to_be64(sctx->count << 3);
 171
 172         /* Pad out to 56 mod 64. */
 173         index = sctx->count & 0x3f;
 174         pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
 175
 176         flags = octeon_crypto_enable(&state);
 177         octeon_sha256_store_hash(sctx);
 178
 179         __octeon_sha256_update(sctx, padding, pad_len);
 180
 181         /* Append length (before padding). */
 182         __octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
 183
 184         octeon_sha256_read_hash(sctx);
 185         octeon_crypto_disable(&state, flags);
 186
 187         /* Store state in digest */
 188         for (i = 0; i < 8; i++)
 189                 dst[i] = cpu_to_be32(sctx->state[i]);
 190
 191         /* Zeroize sensitive information. */
 192         memset(sctx, 0, sizeof(*sctx));
 193
 194         return 0;
 195 }
 196
 197 static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
 198 {
 199         u8 D[SHA256_DIGEST_SIZE];
 200
 201         octeon_sha256_final(desc, D);
 202
 203         memcpy(hash, D, SHA224_DIGEST_SIZE);
 204         memzero_explicit(D, SHA256_DIGEST_SIZE);
 205
 206         return 0;
 207 }
 208
 209 static int octeon_sha256_export(struct shash_desc *desc, void *out)
 210 {
 211         struct sha256_state *sctx = shash_desc_ctx(desc);
 212
 213         memcpy(out, sctx, sizeof(*sctx));
 214         return 0;
 215 }
 216
 217 static int octeon_sha256_import(struct shash_desc *desc, const void *in)
 218 {
 219         struct sha256_state *sctx = shash_desc_ctx(desc);
 220
 221         memcpy(sctx, in, sizeof(*sctx));
 222         return 0;
 223 }
 224
 225 static struct shash_alg octeon_sha256_algs[2] = { {
 226         .digestsize     =       SHA256_DIGEST_SIZE,
 227         .init           =       octeon_sha256_init,
 228         .update         =       octeon_sha256_update,
 229         .final          =       octeon_sha256_final,
 230         .export         =       octeon_sha256_export,
 231         .import         =       octeon_sha256_import,
 232         .descsize       =       sizeof(struct sha256_state),
 233         .statesize      =       sizeof(struct sha256_state),
 234         .base           =       {
 235                 .cra_name       =       "sha256",
 236                 .cra_driver_name=       "octeon-sha256",
 237                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 238                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 239                 .cra_module     =       THIS_MODULE,
 240         }
 241 }, {
 242         .digestsize     =       SHA224_DIGEST_SIZE,
 243         .init           =       octeon_sha224_init,
 244         .update         =       octeon_sha256_update,
 245         .final          =       octeon_sha224_final,
 246         .descsize       =       sizeof(struct sha256_state),
 247         .base           =       {
 248                 .cra_name       =       "sha224",
 249                 .cra_driver_name=       "octeon-sha224",
 250                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 251                 .cra_module     =       THIS_MODULE,
 252         }
 253 } };
 254
 255 static int __init octeon_sha256_mod_init(void)
 256 {
 257         if (!octeon_has_crypto())
 258                 return -ENOTSUPP;
 259         return crypto_register_shashes(octeon_sha256_algs,
 260                                        ARRAY_SIZE(octeon_sha256_algs));
 261 }
 262
 263 static void __exit octeon_sha256_mod_fini(void)
 264 {
 265         crypto_unregister_shashes(octeon_sha256_algs,
 266                                   ARRAY_SIZE(octeon_sha256_algs));
 267 }
 268
 269 module_init(octeon_sha256_mod_init);
 270 module_exit(octeon_sha256_mod_fini);
 271
 272 MODULE_LICENSE("GPL");
 273 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
 274 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");