arch/x86/crypto/morus1280_glue.c

   1 /*
   2  * The MORUS-1280 Authenticated-Encryption Algorithm
   3  *   Common x86 SIMD glue skeleton
   4  *
   5  * Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com>
   6  * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  */
  13
  14 #include <crypto/cryptd.h>
  15 #include <crypto/internal/aead.h>
  16 #include <crypto/internal/skcipher.h>
  17 #include <crypto/morus1280_glue.h>
  18 #include <crypto/scatterwalk.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/scatterlist.h>
  24 #include <asm/fpu/api.h>
  25
  26 struct morus1280_state {
  27         struct morus1280_block s[MORUS_STATE_BLOCKS];
  28 };
  29
  30 struct morus1280_ops {
  31         int (*skcipher_walk_init)(struct skcipher_walk *walk,
  32                                   struct aead_request *req, bool atomic);
  33
  34         void (*crypt_blocks)(void *state, const void *src, void *dst,
  35                              unsigned int length);
  36         void (*crypt_tail)(void *state, const void *src, void *dst,
  37                            unsigned int length);
  38 };
  39
  40 static void crypto_morus1280_glue_process_ad(
  41                 struct morus1280_state *state,
  42                 const struct morus1280_glue_ops *ops,
  43                 struct scatterlist *sg_src, unsigned int assoclen)
  44 {
  45         struct scatter_walk walk;
  46         struct morus1280_block buf;
  47         unsigned int pos = 0;
  48
  49         scatterwalk_start(&walk, sg_src);
  50         while (assoclen != 0) {
  51                 unsigned int size = scatterwalk_clamp(&walk, assoclen);
  52                 unsigned int left = size;
  53                 void *mapped = scatterwalk_map(&walk);
  54                 const u8 *src = (const u8 *)mapped;
  55
  56                 if (pos + size >= MORUS1280_BLOCK_SIZE) {
  57                         if (pos > 0) {
  58                                 unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
  59                                 memcpy(buf.bytes + pos, src, fill);
  60                                 ops->ad(state, buf.bytes, MORUS1280_BLOCK_SIZE);
  61                                 pos = 0;
  62                                 left -= fill;
  63                                 src += fill;
  64                         }
  65
  66                         ops->ad(state, src, left);
  67                         src += left & ~(MORUS1280_BLOCK_SIZE - 1);
  68                         left &= MORUS1280_BLOCK_SIZE - 1;
  69                 }
  70
  71                 memcpy(buf.bytes + pos, src, left);
  72
  73                 pos += left;
  74                 assoclen -= size;
  75                 scatterwalk_unmap(mapped);
  76                 scatterwalk_advance(&walk, size);
  77                 scatterwalk_done(&walk, 0, assoclen);
  78         }
  79
  80         if (pos > 0) {
  81                 memset(buf.bytes + pos, 0, MORUS1280_BLOCK_SIZE - pos);
  82                 ops->ad(state, buf.bytes, MORUS1280_BLOCK_SIZE);
  83         }
  84 }
  85
  86 static void crypto_morus1280_glue_process_crypt(struct morus1280_state *state,
  87                                                 struct morus1280_ops ops,
  88                                                 struct skcipher_walk *walk)
  89 {
  90         while (walk->nbytes >= MORUS1280_BLOCK_SIZE) {
  91                 ops.crypt_blocks(state, walk->src.virt.addr,
  92                                  walk->dst.virt.addr,
  93                                  round_down(walk->nbytes,
  94                                             MORUS1280_BLOCK_SIZE));
  95                 skcipher_walk_done(walk, walk->nbytes % MORUS1280_BLOCK_SIZE);
  96         }
  97
  98         if (walk->nbytes) {
  99                 ops.crypt_tail(state, walk->src.virt.addr, walk->dst.virt.addr,
 100                                walk->nbytes);
 101                 skcipher_walk_done(walk, 0);
 102         }
 103 }
 104
 105 int crypto_morus1280_glue_setkey(struct crypto_aead *aead, const u8 *key,
 106                                  unsigned int keylen)
 107 {
 108         struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
 109
 110         if (keylen == MORUS1280_BLOCK_SIZE) {
 111                 memcpy(ctx->key.bytes, key, MORUS1280_BLOCK_SIZE);
 112         } else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
 113                 memcpy(ctx->key.bytes, key, keylen);
 114                 memcpy(ctx->key.bytes + keylen, key, keylen);
 115         } else {
 116                 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
 117                 return -EINVAL;
 118         }
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL_GPL(crypto_morus1280_glue_setkey);
 123
 124 int crypto_morus1280_glue_setauthsize(struct crypto_aead *tfm,
 125                                       unsigned int authsize)
 126 {
 127         return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
 128 }
 129 EXPORT_SYMBOL_GPL(crypto_morus1280_glue_setauthsize);
 130
 131 static void crypto_morus1280_glue_crypt(struct aead_request *req,
 132                                         struct morus1280_ops ops,
 133                                         unsigned int cryptlen,
 134                                         struct morus1280_block *tag_xor)
 135 {
 136         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 137         struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
 138         struct morus1280_state state;
 139         struct skcipher_walk walk;
 140
 141         ops.skcipher_walk_init(&walk, req, true);
 142
 143         kernel_fpu_begin();
 144
 145         ctx->ops->init(&state, &ctx->key, req->iv);
 146         crypto_morus1280_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
 147         crypto_morus1280_glue_process_crypt(&state, ops, &walk);
 148         ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
 149
 150         kernel_fpu_end();
 151 }
 152
 153 int crypto_morus1280_glue_encrypt(struct aead_request *req)
 154 {
 155         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 156         struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
 157         struct morus1280_ops OPS = {
 158                 .skcipher_walk_init = skcipher_walk_aead_encrypt,
 159                 .crypt_blocks = ctx->ops->enc,
 160                 .crypt_tail = ctx->ops->enc_tail,
 161         };
 162
 163         struct morus1280_block tag = {};
 164         unsigned int authsize = crypto_aead_authsize(tfm);
 165         unsigned int cryptlen = req->cryptlen;
 166
 167         crypto_morus1280_glue_crypt(req, OPS, cryptlen, &tag);
 168
 169         scatterwalk_map_and_copy(tag.bytes, req->dst,
 170                                  req->assoclen + cryptlen, authsize, 1);
 171         return 0;
 172 }
 173 EXPORT_SYMBOL_GPL(crypto_morus1280_glue_encrypt);
 174
 175 int crypto_morus1280_glue_decrypt(struct aead_request *req)
 176 {
 177         static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
 178
 179         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 180         struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
 181         struct morus1280_ops OPS = {
 182                 .skcipher_walk_init = skcipher_walk_aead_decrypt,
 183                 .crypt_blocks = ctx->ops->dec,
 184                 .crypt_tail = ctx->ops->dec_tail,
 185         };
 186
 187         struct morus1280_block tag;
 188         unsigned int authsize = crypto_aead_authsize(tfm);
 189         unsigned int cryptlen = req->cryptlen - authsize;
 190
 191         scatterwalk_map_and_copy(tag.bytes, req->src,
 192                                  req->assoclen + cryptlen, authsize, 0);
 193
 194         crypto_morus1280_glue_crypt(req, OPS, cryptlen, &tag);
 195
 196         return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
 197 }
 198 EXPORT_SYMBOL_GPL(crypto_morus1280_glue_decrypt);
 199
 200 void crypto_morus1280_glue_init_ops(struct crypto_aead *aead,
 201                                     const struct morus1280_glue_ops *ops)
 202 {
 203         struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
 204         ctx->ops = ops;
 205 }
 206 EXPORT_SYMBOL_GPL(crypto_morus1280_glue_init_ops);
 207
 208 int cryptd_morus1280_glue_setkey(struct crypto_aead *aead, const u8 *key,
 209                                  unsigned int keylen)
 210 {
 211         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 212         struct cryptd_aead *cryptd_tfm = *ctx;
 213
 214         return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
 215 }
 216 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_setkey);
 217
 218 int cryptd_morus1280_glue_setauthsize(struct crypto_aead *aead,
 219                                       unsigned int authsize)
 220 {
 221         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 222         struct cryptd_aead *cryptd_tfm = *ctx;
 223
 224         return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
 225 }
 226 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_setauthsize);
 227
 228 int cryptd_morus1280_glue_encrypt(struct aead_request *req)
 229 {
 230         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 231         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 232         struct cryptd_aead *cryptd_tfm = *ctx;
 233
 234         aead = &cryptd_tfm->base;
 235         if (irq_fpu_usable() && (!in_atomic() ||
 236                                  !cryptd_aead_queued(cryptd_tfm)))
 237                 aead = cryptd_aead_child(cryptd_tfm);
 238
 239         aead_request_set_tfm(req, aead);
 240
 241         return crypto_aead_encrypt(req);
 242 }
 243 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_encrypt);
 244
 245 int cryptd_morus1280_glue_decrypt(struct aead_request *req)
 246 {
 247         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 248         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 249         struct cryptd_aead *cryptd_tfm = *ctx;
 250
 251         aead = &cryptd_tfm->base;
 252         if (irq_fpu_usable() && (!in_atomic() ||
 253                                  !cryptd_aead_queued(cryptd_tfm)))
 254                 aead = cryptd_aead_child(cryptd_tfm);
 255
 256         aead_request_set_tfm(req, aead);
 257
 258         return crypto_aead_decrypt(req);
 259 }
 260 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_decrypt);
 261
 262 int cryptd_morus1280_glue_init_tfm(struct crypto_aead *aead)
 263 {
 264         struct cryptd_aead *cryptd_tfm;
 265         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 266         const char *name = crypto_aead_alg(aead)->base.cra_driver_name;
 267         char internal_name[CRYPTO_MAX_ALG_NAME];
 268
 269         if (snprintf(internal_name, CRYPTO_MAX_ALG_NAME, "__%s", name)
 270                         >= CRYPTO_MAX_ALG_NAME)
 271                 return -ENAMETOOLONG;
 272
 273         cryptd_tfm = cryptd_alloc_aead(internal_name, CRYPTO_ALG_INTERNAL,
 274                                        CRYPTO_ALG_INTERNAL);
 275         if (IS_ERR(cryptd_tfm))
 276                 return PTR_ERR(cryptd_tfm);
 277
 278         *ctx = cryptd_tfm;
 279         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
 280         return 0;
 281 }
 282 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_init_tfm);
 283
 284 void cryptd_morus1280_glue_exit_tfm(struct crypto_aead *aead)
 285 {
 286         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 287
 288         cryptd_free_aead(*ctx);
 289 }
 290 EXPORT_SYMBOL_GPL(cryptd_morus1280_glue_exit_tfm);
 291
 292 MODULE_LICENSE("GPL");
 293 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
 294 MODULE_DESCRIPTION("MORUS-1280 AEAD mode -- glue for x86 optimizations");