arch/x86/crypto/morus640_glue.c

   1 /*
   2  * The MORUS-640 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/morus640_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 morus640_state {
  27         struct morus640_block s[MORUS_STATE_BLOCKS];
  28 };
  29
  30 struct morus640_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_morus640_glue_process_ad(
  41                 struct morus640_state *state,
  42                 const struct morus640_glue_ops *ops,
  43                 struct scatterlist *sg_src, unsigned int assoclen)
  44 {
  45         struct scatter_walk walk;
  46         struct morus640_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 >= MORUS640_BLOCK_SIZE) {
  57                         if (pos > 0) {
  58                                 unsigned int fill = MORUS640_BLOCK_SIZE - pos;
  59                                 memcpy(buf.bytes + pos, src, fill);
  60                                 ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
  61                                 pos = 0;
  62                                 left -= fill;
  63                                 src += fill;
  64                         }
  65
  66                         ops->ad(state, src, left);
  67                         src += left & ~(MORUS640_BLOCK_SIZE - 1);
  68                         left &= MORUS640_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, MORUS640_BLOCK_SIZE - pos);
  82                 ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
  83         }
  84 }
  85
  86 static void crypto_morus640_glue_process_crypt(struct morus640_state *state,
  87                                                struct morus640_ops ops,
  88                                                struct aead_request *req)
  89 {
  90         struct skcipher_walk walk;
  91         u8 *cursor_src, *cursor_dst;
  92         unsigned int chunksize, base;
  93
  94         ops.skcipher_walk_init(&walk, req, false);
  95
  96         while (walk.nbytes) {
  97                 cursor_src = walk.src.virt.addr;
  98                 cursor_dst = walk.dst.virt.addr;
  99                 chunksize = walk.nbytes;
 100
 101                 ops.crypt_blocks(state, cursor_src, cursor_dst, chunksize);
 102
 103                 base = chunksize & ~(MORUS640_BLOCK_SIZE - 1);
 104                 cursor_src += base;
 105                 cursor_dst += base;
 106                 chunksize &= MORUS640_BLOCK_SIZE - 1;
 107
 108                 if (chunksize > 0)
 109                         ops.crypt_tail(state, cursor_src, cursor_dst,
 110                                        chunksize);
 111
 112                 skcipher_walk_done(&walk, 0);
 113         }
 114 }
 115
 116 int crypto_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
 117                                 unsigned int keylen)
 118 {
 119         struct morus640_ctx *ctx = crypto_aead_ctx(aead);
 120
 121         if (keylen != MORUS640_BLOCK_SIZE) {
 122                 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
 123                 return -EINVAL;
 124         }
 125
 126         memcpy(ctx->key.bytes, key, MORUS640_BLOCK_SIZE);
 127         return 0;
 128 }
 129 EXPORT_SYMBOL_GPL(crypto_morus640_glue_setkey);
 130
 131 int crypto_morus640_glue_setauthsize(struct crypto_aead *tfm,
 132                                      unsigned int authsize)
 133 {
 134         return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
 135 }
 136 EXPORT_SYMBOL_GPL(crypto_morus640_glue_setauthsize);
 137
 138 static void crypto_morus640_glue_crypt(struct aead_request *req,
 139                                        struct morus640_ops ops,
 140                                        unsigned int cryptlen,
 141                                        struct morus640_block *tag_xor)
 142 {
 143         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 144         struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
 145         struct morus640_state state;
 146
 147         kernel_fpu_begin();
 148
 149         ctx->ops->init(&state, &ctx->key, req->iv);
 150         crypto_morus640_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
 151         crypto_morus640_glue_process_crypt(&state, ops, req);
 152         ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
 153
 154         kernel_fpu_end();
 155 }
 156
 157 int crypto_morus640_glue_encrypt(struct aead_request *req)
 158 {
 159         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 160         struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
 161         struct morus640_ops OPS = {
 162                 .skcipher_walk_init = skcipher_walk_aead_encrypt,
 163                 .crypt_blocks = ctx->ops->enc,
 164                 .crypt_tail = ctx->ops->enc_tail,
 165         };
 166
 167         struct morus640_block tag = {};
 168         unsigned int authsize = crypto_aead_authsize(tfm);
 169         unsigned int cryptlen = req->cryptlen;
 170
 171         crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
 172
 173         scatterwalk_map_and_copy(tag.bytes, req->dst,
 174                                  req->assoclen + cryptlen, authsize, 1);
 175         return 0;
 176 }
 177 EXPORT_SYMBOL_GPL(crypto_morus640_glue_encrypt);
 178
 179 int crypto_morus640_glue_decrypt(struct aead_request *req)
 180 {
 181         static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
 182
 183         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 184         struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
 185         struct morus640_ops OPS = {
 186                 .skcipher_walk_init = skcipher_walk_aead_decrypt,
 187                 .crypt_blocks = ctx->ops->dec,
 188                 .crypt_tail = ctx->ops->dec_tail,
 189         };
 190
 191         struct morus640_block tag;
 192         unsigned int authsize = crypto_aead_authsize(tfm);
 193         unsigned int cryptlen = req->cryptlen - authsize;
 194
 195         scatterwalk_map_and_copy(tag.bytes, req->src,
 196                                  req->assoclen + cryptlen, authsize, 0);
 197
 198         crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
 199
 200         return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
 201 }
 202 EXPORT_SYMBOL_GPL(crypto_morus640_glue_decrypt);
 203
 204 void crypto_morus640_glue_init_ops(struct crypto_aead *aead,
 205                                    const struct morus640_glue_ops *ops)
 206 {
 207         struct morus640_ctx *ctx = crypto_aead_ctx(aead);
 208         ctx->ops = ops;
 209 }
 210 EXPORT_SYMBOL_GPL(crypto_morus640_glue_init_ops);
 211
 212 int cryptd_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
 213                                 unsigned int keylen)
 214 {
 215         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 216         struct cryptd_aead *cryptd_tfm = *ctx;
 217
 218         return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
 219 }
 220 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setkey);
 221
 222 int cryptd_morus640_glue_setauthsize(struct crypto_aead *aead,
 223                                      unsigned int authsize)
 224 {
 225         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 226         struct cryptd_aead *cryptd_tfm = *ctx;
 227
 228         return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
 229 }
 230 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setauthsize);
 231
 232 int cryptd_morus640_glue_encrypt(struct aead_request *req)
 233 {
 234         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 235         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 236         struct cryptd_aead *cryptd_tfm = *ctx;
 237
 238         aead = &cryptd_tfm->base;
 239         if (irq_fpu_usable() && (!in_atomic() ||
 240                                  !cryptd_aead_queued(cryptd_tfm)))
 241                 aead = cryptd_aead_child(cryptd_tfm);
 242
 243         aead_request_set_tfm(req, aead);
 244
 245         return crypto_aead_encrypt(req);
 246 }
 247 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_encrypt);
 248
 249 int cryptd_morus640_glue_decrypt(struct aead_request *req)
 250 {
 251         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 252         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 253         struct cryptd_aead *cryptd_tfm = *ctx;
 254
 255         aead = &cryptd_tfm->base;
 256         if (irq_fpu_usable() && (!in_atomic() ||
 257                                  !cryptd_aead_queued(cryptd_tfm)))
 258                 aead = cryptd_aead_child(cryptd_tfm);
 259
 260         aead_request_set_tfm(req, aead);
 261
 262         return crypto_aead_decrypt(req);
 263 }
 264 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_decrypt);
 265
 266 int cryptd_morus640_glue_init_tfm(struct crypto_aead *aead)
 267 {
 268         struct cryptd_aead *cryptd_tfm;
 269         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 270         const char *name = crypto_aead_alg(aead)->base.cra_driver_name;
 271         char internal_name[CRYPTO_MAX_ALG_NAME];
 272
 273         if (snprintf(internal_name, CRYPTO_MAX_ALG_NAME, "__%s", name)
 274                         >= CRYPTO_MAX_ALG_NAME)
 275                 return -ENAMETOOLONG;
 276
 277         cryptd_tfm = cryptd_alloc_aead(internal_name, CRYPTO_ALG_INTERNAL,
 278                                        CRYPTO_ALG_INTERNAL);
 279         if (IS_ERR(cryptd_tfm))
 280                 return PTR_ERR(cryptd_tfm);
 281
 282         *ctx = cryptd_tfm;
 283         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
 284         return 0;
 285 }
 286 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_init_tfm);
 287
 288 void cryptd_morus640_glue_exit_tfm(struct crypto_aead *aead)
 289 {
 290         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 291
 292         cryptd_free_aead(*ctx);
 293 }
 294 EXPORT_SYMBOL_GPL(cryptd_morus640_glue_exit_tfm);
 295
 296 MODULE_LICENSE("GPL");
 297 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
 298 MODULE_DESCRIPTION("MORUS-640 AEAD mode -- glue for x86 optimizations");