drivers/crypto/amcc/crypto4xx_alg.c

   1 /**
   2  * AMCC SoC PPC4xx Crypto Driver
   3  *
   4  * Copyright (c) 2008 Applied Micro Circuits Corporation.
   5  * All rights reserved. James Hsiao <jhsiao@amcc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * This file implements the Linux crypto algorithms.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/spinlock_types.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/crypto.h>
  25 #include <linux/hash.h>
  26 #include <crypto/internal/hash.h>
  27 #include <linux/dma-mapping.h>
  28 #include <crypto/algapi.h>
  29 #include <crypto/aead.h>
  30 #include <crypto/aes.h>
  31 #include <crypto/gcm.h>
  32 #include <crypto/sha.h>
  33 #include <crypto/ctr.h>
  34 #include <crypto/skcipher.h>
  35 #include "crypto4xx_reg_def.h"
  36 #include "crypto4xx_core.h"
  37 #include "crypto4xx_sa.h"
  38
  39 static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
  40                                      u32 save_iv, u32 ld_h, u32 ld_iv,
  41                                      u32 hdr_proc, u32 h, u32 c, u32 pad_type,
  42                                      u32 op_grp, u32 op, u32 dir)
  43 {
  44         sa->sa_command_0.w = 0;
  45         sa->sa_command_0.bf.save_hash_state = save_h;
  46         sa->sa_command_0.bf.save_iv = save_iv;
  47         sa->sa_command_0.bf.load_hash_state = ld_h;
  48         sa->sa_command_0.bf.load_iv = ld_iv;
  49         sa->sa_command_0.bf.hdr_proc = hdr_proc;
  50         sa->sa_command_0.bf.hash_alg = h;
  51         sa->sa_command_0.bf.cipher_alg = c;
  52         sa->sa_command_0.bf.pad_type = pad_type & 3;
  53         sa->sa_command_0.bf.extend_pad = pad_type >> 2;
  54         sa->sa_command_0.bf.op_group = op_grp;
  55         sa->sa_command_0.bf.opcode = op;
  56         sa->sa_command_0.bf.dir = dir;
  57 }
  58
  59 static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
  60                                      u32 hmac_mc, u32 cfb, u32 esn,
  61                                      u32 sn_mask, u32 mute, u32 cp_pad,
  62                                      u32 cp_pay, u32 cp_hdr)
  63 {
  64         sa->sa_command_1.w = 0;
  65         sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
  66         sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
  67         sa->sa_command_1.bf.feedback_mode = cfb,
  68         sa->sa_command_1.bf.sa_rev = 1;
  69         sa->sa_command_1.bf.hmac_muting = hmac_mc;
  70         sa->sa_command_1.bf.extended_seq_num = esn;
  71         sa->sa_command_1.bf.seq_num_mask = sn_mask;
  72         sa->sa_command_1.bf.mutable_bit_proc = mute;
  73         sa->sa_command_1.bf.copy_pad = cp_pad;
  74         sa->sa_command_1.bf.copy_payload = cp_pay;
  75         sa->sa_command_1.bf.copy_hdr = cp_hdr;
  76 }
  77
  78 static inline int crypto4xx_crypt(struct skcipher_request *req,
  79                                   const unsigned int ivlen, bool decrypt)
  80 {
  81         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
  82         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
  83         __le32 iv[AES_IV_SIZE];
  84
  85         if (ivlen)
  86                 crypto4xx_memcpy_to_le32(iv, req->iv, ivlen);
  87
  88         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  89                 req->cryptlen, iv, ivlen, decrypt ? ctx->sa_in : ctx->sa_out,
  90                 ctx->sa_len, 0, NULL);
  91 }
  92
  93 int crypto4xx_encrypt_noiv(struct skcipher_request *req)
  94 {
  95         return crypto4xx_crypt(req, 0, false);
  96 }
  97
  98 int crypto4xx_encrypt_iv(struct skcipher_request *req)
  99 {
 100         return crypto4xx_crypt(req, AES_IV_SIZE, false);
 101 }
 102
 103 int crypto4xx_decrypt_noiv(struct skcipher_request *req)
 104 {
 105         return crypto4xx_crypt(req, 0, true);
 106 }
 107
 108 int crypto4xx_decrypt_iv(struct skcipher_request *req)
 109 {
 110         return crypto4xx_crypt(req, AES_IV_SIZE, true);
 111 }
 112
 113 /**
 114  * AES Functions
 115  */
 116 static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher,
 117                                 const u8 *key,
 118                                 unsigned int keylen,
 119                                 unsigned char cm,
 120                                 u8 fb)
 121 {
 122         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 123         struct dynamic_sa_ctl *sa;
 124         int    rc;
 125
 126         if (keylen != AES_KEYSIZE_256 &&
 127                 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
 128                 crypto_skcipher_set_flags(cipher,
 129                                 CRYPTO_TFM_RES_BAD_KEY_LEN);
 130                 return -EINVAL;
 131         }
 132
 133         /* Create SA */
 134         if (ctx->sa_in || ctx->sa_out)
 135                 crypto4xx_free_sa(ctx);
 136
 137         rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
 138         if (rc)
 139                 return rc;
 140
 141         /* Setup SA */
 142         sa = ctx->sa_in;
 143
 144         set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_ECB ?
 145                                  SA_NOT_SAVE_IV : SA_SAVE_IV),
 146                                  SA_NOT_LOAD_HASH, (cm == CRYPTO_MODE_ECB ?
 147                                  SA_LOAD_IV_FROM_SA : SA_LOAD_IV_FROM_STATE),
 148                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
 149                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 150                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
 151                                  DIR_INBOUND);
 152
 153         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
 154                                  fb, SA_EXTENDED_SN_OFF,
 155                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 156                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 157                                  SA_NOT_COPY_HDR);
 158         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 159                                  key, keylen);
 160         sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
 161         sa->sa_command_1.bf.key_len = keylen >> 3;
 162
 163         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 164         sa = ctx->sa_out;
 165         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 166         /*
 167          * SA_OPCODE_ENCRYPT is the same value as SA_OPCODE_DECRYPT.
 168          * it's the DIR_(IN|OUT)BOUND that matters
 169          */
 170         sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT;
 171
 172         return 0;
 173 }
 174
 175 int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
 176                              const u8 *key, unsigned int keylen)
 177 {
 178         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
 179                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 180 }
 181
 182 int crypto4xx_setkey_aes_cfb(struct crypto_skcipher *cipher,
 183                              const u8 *key, unsigned int keylen)
 184 {
 185         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CFB,
 186                                     CRYPTO_FEEDBACK_MODE_128BIT_CFB);
 187 }
 188
 189 int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
 190                              const u8 *key, unsigned int keylen)
 191 {
 192         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
 193                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 194 }
 195
 196 int crypto4xx_setkey_aes_ofb(struct crypto_skcipher *cipher,
 197                              const u8 *key, unsigned int keylen)
 198 {
 199         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_OFB,
 200                                     CRYPTO_FEEDBACK_MODE_64BIT_OFB);
 201 }
 202
 203 int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
 204                              const u8 *key, unsigned int keylen)
 205 {
 206         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 207         int rc;
 208
 209         rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
 210                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 211         if (rc)
 212                 return rc;
 213
 214         ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
 215                                                  CTR_RFC3686_NONCE_SIZE]);
 216
 217         return 0;
 218 }
 219
 220 int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
 221 {
 222         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 223         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 224         __le32 iv[AES_IV_SIZE / 4] = {
 225                 ctx->iv_nonce,
 226                 cpu_to_le32p((u32 *) req->iv),
 227                 cpu_to_le32p((u32 *) (req->iv + 4)),
 228                 cpu_to_le32(1) };
 229
 230         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 231                                   req->cryptlen, iv, AES_IV_SIZE,
 232                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 233 }
 234
 235 int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
 236 {
 237         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 238         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 239         __le32 iv[AES_IV_SIZE / 4] = {
 240                 ctx->iv_nonce,
 241                 cpu_to_le32p((u32 *) req->iv),
 242                 cpu_to_le32p((u32 *) (req->iv + 4)),
 243                 cpu_to_le32(1) };
 244
 245         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 246                                   req->cryptlen, iv, AES_IV_SIZE,
 247                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 248 }
 249
 250 static int
 251 crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
 252 {
 253         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 254         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 255         size_t iv_len = crypto_skcipher_ivsize(cipher);
 256         unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
 257         unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
 258                         AES_BLOCK_SIZE;
 259
 260         /*
 261          * The hardware uses only the last 32-bits as the counter while the
 262          * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
 263          * the whole IV is a counter.  So fallback if the counter is going to
 264          * overlow.
 265          */
 266         if (counter + nblks < counter) {
 267                 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher.cipher);
 268                 int ret;
 269
 270                 skcipher_request_set_sync_tfm(subreq, ctx->sw_cipher.cipher);
 271                 skcipher_request_set_callback(subreq, req->base.flags,
 272                         NULL, NULL);
 273                 skcipher_request_set_crypt(subreq, req->src, req->dst,
 274                         req->cryptlen, req->iv);
 275                 ret = encrypt ? crypto_skcipher_encrypt(subreq)
 276                         : crypto_skcipher_decrypt(subreq);
 277                 skcipher_request_zero(subreq);
 278                 return ret;
 279         }
 280
 281         return encrypt ? crypto4xx_encrypt_iv(req)
 282                        : crypto4xx_decrypt_iv(req);
 283 }
 284
 285 static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
 286                                        struct crypto_skcipher *cipher,
 287                                        const u8 *key,
 288                                        unsigned int keylen)
 289 {
 290         int rc;
 291
 292         crypto_sync_skcipher_clear_flags(ctx->sw_cipher.cipher,
 293                                     CRYPTO_TFM_REQ_MASK);
 294         crypto_sync_skcipher_set_flags(ctx->sw_cipher.cipher,
 295                 crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 296         rc = crypto_sync_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
 297         crypto_skcipher_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 298         crypto_skcipher_set_flags(cipher,
 299                 crypto_sync_skcipher_get_flags(ctx->sw_cipher.cipher) &
 300                         CRYPTO_TFM_RES_MASK);
 301
 302         return rc;
 303 }
 304
 305 int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
 306                              const u8 *key, unsigned int keylen)
 307 {
 308         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 309         int rc;
 310
 311         rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
 312         if (rc)
 313                 return rc;
 314
 315         return crypto4xx_setkey_aes(cipher, key, keylen,
 316                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 317 }
 318
 319 int crypto4xx_encrypt_ctr(struct skcipher_request *req)
 320 {
 321         return crypto4xx_ctr_crypt(req, true);
 322 }
 323
 324 int crypto4xx_decrypt_ctr(struct skcipher_request *req)
 325 {
 326         return crypto4xx_ctr_crypt(req, false);
 327 }
 328
 329 static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
 330                                                 unsigned int len,
 331                                                 bool is_ccm, bool decrypt)
 332 {
 333         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 334
 335         /* authsize has to be a multiple of 4 */
 336         if (aead->authsize & 3)
 337                 return true;
 338
 339         /*
 340          * hardware does not handle cases where plaintext
 341          * is less than a block.
 342          */
 343         if (len < AES_BLOCK_SIZE)
 344                 return true;
 345
 346         /* assoc len needs to be a multiple of 4 and <= 1020 */
 347         if (req->assoclen & 0x3 || req->assoclen > 1020)
 348                 return true;
 349
 350         /* CCM supports only counter field length of 2 and 4 bytes */
 351         if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
 352                 return true;
 353
 354         return false;
 355 }
 356
 357 static int crypto4xx_aead_fallback(struct aead_request *req,
 358         struct crypto4xx_ctx *ctx, bool do_decrypt)
 359 {
 360         struct aead_request *subreq = aead_request_ctx(req);
 361
 362         aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
 363         aead_request_set_callback(subreq, req->base.flags,
 364                                   req->base.complete, req->base.data);
 365         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 366                                req->iv);
 367         aead_request_set_ad(subreq, req->assoclen);
 368         return do_decrypt ? crypto_aead_decrypt(subreq) :
 369                             crypto_aead_encrypt(subreq);
 370 }
 371
 372 static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
 373                                          struct crypto_aead *cipher,
 374                                          const u8 *key,
 375                                          unsigned int keylen)
 376 {
 377         int rc;
 378
 379         crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
 380         crypto_aead_set_flags(ctx->sw_cipher.aead,
 381                 crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 382         rc = crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
 383         crypto_aead_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 384         crypto_aead_set_flags(cipher,
 385                 crypto_aead_get_flags(ctx->sw_cipher.aead) &
 386                         CRYPTO_TFM_RES_MASK);
 387
 388         return rc;
 389 }
 390
 391 /**
 392  * AES-CCM Functions
 393  */
 394
 395 int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
 396                              unsigned int keylen)
 397 {
 398         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 399         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 400         struct dynamic_sa_ctl *sa;
 401         int rc = 0;
 402
 403         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 404         if (rc)
 405                 return rc;
 406
 407         if (ctx->sa_in || ctx->sa_out)
 408                 crypto4xx_free_sa(ctx);
 409
 410         rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
 411         if (rc)
 412                 return rc;
 413
 414         /* Setup SA */
 415         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 416         sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
 417
 418         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 419                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 420                                  SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 421                                  SA_CIPHER_ALG_AES,
 422                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 423                                  SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);
 424
 425         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 426                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 427                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 428                                  SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 429                                  SA_NOT_COPY_HDR);
 430
 431         sa->sa_command_1.bf.key_len = keylen >> 3;
 432
 433         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);
 434
 435         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 436         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 437
 438         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 439                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 440                                  SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 441                                  SA_CIPHER_ALG_AES,
 442                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 443                                  SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);
 444
 445         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 446                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 447                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 448                                  SA_COPY_PAD, SA_COPY_PAYLOAD,
 449                                  SA_NOT_COPY_HDR);
 450
 451         sa->sa_command_1.bf.key_len = keylen >> 3;
 452         return 0;
 453 }
 454
 455 static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
 456 {
 457         struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
 458         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 459         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 460         __le32 iv[16];
 461         u32 tmp_sa[SA_AES128_CCM_LEN + 4];
 462         struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
 463         unsigned int len = req->cryptlen;
 464
 465         if (decrypt)
 466                 len -= crypto_aead_authsize(aead);
 467
 468         if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
 469                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 470
 471         memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
 472         sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
 473
 474         if (req->iv[0] == 1) {
 475                 /* CRYPTO_MODE_AES_ICM */
 476                 sa->sa_command_1.bf.crypto_mode9_8 = 1;
 477         }
 478
 479         iv[3] = cpu_to_le32(0);
 480         crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));
 481
 482         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 483                                   len, iv, sizeof(iv),
 484                                   sa, ctx->sa_len, req->assoclen, rctx->dst);
 485 }
 486
 487 int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
 488 {
 489         return crypto4xx_crypt_aes_ccm(req, false);
 490 }
 491
 492 int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
 493 {
 494         return crypto4xx_crypt_aes_ccm(req, true);
 495 }
 496
 497 int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
 498                                unsigned int authsize)
 499 {
 500         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 501         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 502
 503         return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
 504 }
 505
 506 /**
 507  * AES-GCM Functions
 508  */
 509
 510 static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
 511 {
 512         switch (keylen) {
 513         case 16:
 514         case 24:
 515         case 32:
 516                 return 0;
 517         default:
 518                 return -EINVAL;
 519         }
 520 }
 521
 522 static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
 523                                              unsigned int keylen)
 524 {
 525         struct crypto_cipher *aes_tfm = NULL;
 526         uint8_t src[16] = { 0 };
 527         int rc = 0;
 528
 529         aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_NEED_FALLBACK);
 530         if (IS_ERR(aes_tfm)) {
 531                 rc = PTR_ERR(aes_tfm);
 532                 pr_warn("could not load aes cipher driver: %d\n", rc);
 533                 return rc;
 534         }
 535
 536         rc = crypto_cipher_setkey(aes_tfm, key, keylen);
 537         if (rc) {
 538                 pr_err("setkey() failed: %d\n", rc);
 539                 goto out;
 540         }
 541
 542         crypto_cipher_encrypt_one(aes_tfm, src, src);
 543         crypto4xx_memcpy_to_le32(hash_start, src, 16);
 544 out:
 545         crypto_free_cipher(aes_tfm);
 546         return rc;
 547 }
 548
 549 int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
 550                              const u8 *key, unsigned int keylen)
 551 {
 552         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 553         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 554         struct dynamic_sa_ctl *sa;
 555         int    rc = 0;
 556
 557         if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0) {
 558                 crypto_aead_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 559                 return -EINVAL;
 560         }
 561
 562         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 563         if (rc)
 564                 return rc;
 565
 566         if (ctx->sa_in || ctx->sa_out)
 567                 crypto4xx_free_sa(ctx);
 568
 569         rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
 570         if (rc)
 571                 return rc;
 572
 573         sa  = (struct dynamic_sa_ctl *) ctx->sa_in;
 574
 575         sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
 576         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 577                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 578                                  SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
 579                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 580                                  SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
 581                                  DIR_INBOUND);
 582         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 583                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 584                                  SA_SEQ_MASK_ON, SA_MC_DISABLE,
 585                                  SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 586                                  SA_NOT_COPY_HDR);
 587
 588         sa->sa_command_1.bf.key_len = keylen >> 3;
 589
 590         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 591                                  key, keylen);
 592
 593         rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
 594                 key, keylen);
 595         if (rc) {
 596                 pr_err("GCM hash key setting failed = %d\n", rc);
 597                 goto err;
 598         }
 599
 600         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 601         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 602         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 603         sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;
 604
 605         return 0;
 606 err:
 607         crypto4xx_free_sa(ctx);
 608         return rc;
 609 }
 610
 611 static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
 612                                           bool decrypt)
 613 {
 614         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 615         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 616         __le32 iv[4];
 617         unsigned int len = req->cryptlen;
 618
 619         if (decrypt)
 620                 len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
 621
 622         if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
 623                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 624
 625         crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
 626         iv[3] = cpu_to_le32(1);
 627
 628         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 629                                   len, iv, sizeof(iv),
 630                                   decrypt ? ctx->sa_in : ctx->sa_out,
 631                                   ctx->sa_len, req->assoclen, rctx->dst);
 632 }
 633
 634 int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
 635 {
 636         return crypto4xx_crypt_aes_gcm(req, false);
 637 }
 638
 639 int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
 640 {
 641         return crypto4xx_crypt_aes_gcm(req, true);
 642 }
 643
 644 /**
 645  * HASH SHA1 Functions
 646  */
 647 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
 648                                    unsigned int sa_len,
 649                                    unsigned char ha,
 650                                    unsigned char hm)
 651 {
 652         struct crypto_alg *alg = tfm->__crt_alg;
 653         struct crypto4xx_alg *my_alg;
 654         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 655         struct dynamic_sa_hash160 *sa;
 656         int rc;
 657
 658         my_alg = container_of(__crypto_ahash_alg(alg), struct crypto4xx_alg,
 659                               alg.u.hash);
 660         ctx->dev   = my_alg->dev;
 661
 662         /* Create SA */
 663         if (ctx->sa_in || ctx->sa_out)
 664                 crypto4xx_free_sa(ctx);
 665
 666         rc = crypto4xx_alloc_sa(ctx, sa_len);
 667         if (rc)
 668                 return rc;
 669
 670         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 671                                  sizeof(struct crypto4xx_ctx));
 672         sa = (struct dynamic_sa_hash160 *)ctx->sa_in;
 673         set_dynamic_sa_command_0(&sa->ctrl, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 674                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
 675                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
 676                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 677                                  SA_OPCODE_HASH, DIR_INBOUND);
 678         set_dynamic_sa_command_1(&sa->ctrl, 0, SA_HASH_MODE_HASH,
 679                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 680                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 681                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 682                                  SA_NOT_COPY_HDR);
 683         /* Need to zero hash digest in SA */
 684         memset(sa->inner_digest, 0, sizeof(sa->inner_digest));
 685         memset(sa->outer_digest, 0, sizeof(sa->outer_digest));
 686
 687         return 0;
 688 }
 689
 690 int crypto4xx_hash_init(struct ahash_request *req)
 691 {
 692         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 693         int ds;
 694         struct dynamic_sa_ctl *sa;
 695
 696         sa = ctx->sa_in;
 697         ds = crypto_ahash_digestsize(
 698                         __crypto_ahash_cast(req->base.tfm));
 699         sa->sa_command_0.bf.digest_len = ds >> 2;
 700         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
 701
 702         return 0;
 703 }
 704
 705 int crypto4xx_hash_update(struct ahash_request *req)
 706 {
 707         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 708         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 709         struct scatterlist dst;
 710         unsigned int ds = crypto_ahash_digestsize(ahash);
 711
 712         sg_init_one(&dst, req->result, ds);
 713
 714         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 715                                   req->nbytes, NULL, 0, ctx->sa_in,
 716                                   ctx->sa_len, 0, NULL);
 717 }
 718
 719 int crypto4xx_hash_final(struct ahash_request *req)
 720 {
 721         return 0;
 722 }
 723
 724 int crypto4xx_hash_digest(struct ahash_request *req)
 725 {
 726         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 727         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 728         struct scatterlist dst;
 729         unsigned int ds = crypto_ahash_digestsize(ahash);
 730
 731         sg_init_one(&dst, req->result, ds);
 732
 733         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 734                                   req->nbytes, NULL, 0, ctx->sa_in,
 735                                   ctx->sa_len, 0, NULL);
 736 }
 737
 738 /**
 739  * SHA1 Algorithm
 740  */
 741 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
 742 {
 743         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
 744                                        SA_HASH_MODE_HASH);
 745 }