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_CBC ?
 145                                  SA_SAVE_IV : SA_NOT_SAVE_IV),
 146                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 147                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
 148                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 149                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
 150                                  DIR_INBOUND);
 151
 152         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
 153                                  fb, SA_EXTENDED_SN_OFF,
 154                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 155                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 156                                  SA_NOT_COPY_HDR);
 157         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 158                                  key, keylen);
 159         sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
 160         sa->sa_command_1.bf.key_len = keylen >> 3;
 161
 162         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 163         sa = ctx->sa_out;
 164         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 165
 166         return 0;
 167 }
 168
 169 int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
 170                              const u8 *key, unsigned int keylen)
 171 {
 172         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
 173                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 174 }
 175
 176 int crypto4xx_setkey_aes_cfb(struct crypto_skcipher *cipher,
 177                              const u8 *key, unsigned int keylen)
 178 {
 179         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CFB,
 180                                     CRYPTO_FEEDBACK_MODE_128BIT_CFB);
 181 }
 182
 183 int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
 184                              const u8 *key, unsigned int keylen)
 185 {
 186         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
 187                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 188 }
 189
 190 int crypto4xx_setkey_aes_ofb(struct crypto_skcipher *cipher,
 191                              const u8 *key, unsigned int keylen)
 192 {
 193         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_OFB,
 194                                     CRYPTO_FEEDBACK_MODE_64BIT_OFB);
 195 }
 196
 197 int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
 198                              const u8 *key, unsigned int keylen)
 199 {
 200         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 201         int rc;
 202
 203         rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
 204                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 205         if (rc)
 206                 return rc;
 207
 208         ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
 209                                                  CTR_RFC3686_NONCE_SIZE]);
 210
 211         return 0;
 212 }
 213
 214 int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
 215 {
 216         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 217         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 218         __le32 iv[AES_IV_SIZE / 4] = {
 219                 ctx->iv_nonce,
 220                 cpu_to_le32p((u32 *) req->iv),
 221                 cpu_to_le32p((u32 *) (req->iv + 4)),
 222                 cpu_to_le32(1) };
 223
 224         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 225                                   req->cryptlen, iv, AES_IV_SIZE,
 226                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 227 }
 228
 229 int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
 230 {
 231         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 232         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 233         __le32 iv[AES_IV_SIZE / 4] = {
 234                 ctx->iv_nonce,
 235                 cpu_to_le32p((u32 *) req->iv),
 236                 cpu_to_le32p((u32 *) (req->iv + 4)),
 237                 cpu_to_le32(1) };
 238
 239         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 240                                   req->cryptlen, iv, AES_IV_SIZE,
 241                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 242 }
 243
 244 static int
 245 crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
 246 {
 247         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 248         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 249         size_t iv_len = crypto_skcipher_ivsize(cipher);
 250         unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
 251         unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
 252                         AES_BLOCK_SIZE;
 253
 254         /*
 255          * The hardware uses only the last 32-bits as the counter while the
 256          * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
 257          * the whole IV is a counter.  So fallback if the counter is going to
 258          * overlow.
 259          */
 260         if (counter + nblks < counter) {
 261                 struct skcipher_request *subreq = skcipher_request_ctx(req);
 262                 int ret;
 263
 264                 skcipher_request_set_tfm(subreq, ctx->sw_cipher.cipher);
 265                 skcipher_request_set_callback(subreq, req->base.flags,
 266                         NULL, NULL);
 267                 skcipher_request_set_crypt(subreq, req->src, req->dst,
 268                         req->cryptlen, req->iv);
 269                 ret = encrypt ? crypto_skcipher_encrypt(subreq)
 270                         : crypto_skcipher_decrypt(subreq);
 271                 skcipher_request_zero(subreq);
 272                 return ret;
 273         }
 274
 275         return encrypt ? crypto4xx_encrypt_iv(req)
 276                        : crypto4xx_decrypt_iv(req);
 277 }
 278
 279 static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
 280                                        struct crypto_skcipher *cipher,
 281                                        const u8 *key,
 282                                        unsigned int keylen)
 283 {
 284         int rc;
 285
 286         crypto_skcipher_clear_flags(ctx->sw_cipher.cipher,
 287                                     CRYPTO_TFM_REQ_MASK);
 288         crypto_skcipher_set_flags(ctx->sw_cipher.cipher,
 289                 crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 290         rc = crypto_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
 291         crypto_skcipher_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 292         crypto_skcipher_set_flags(cipher,
 293                 crypto_skcipher_get_flags(ctx->sw_cipher.cipher) &
 294                         CRYPTO_TFM_RES_MASK);
 295
 296         return rc;
 297 }
 298
 299 int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
 300                              const u8 *key, unsigned int keylen)
 301 {
 302         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 303         int rc;
 304
 305         rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
 306         if (rc)
 307                 return rc;
 308
 309         return crypto4xx_setkey_aes(cipher, key, keylen,
 310                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 311 }
 312
 313 int crypto4xx_encrypt_ctr(struct skcipher_request *req)
 314 {
 315         return crypto4xx_ctr_crypt(req, true);
 316 }
 317
 318 int crypto4xx_decrypt_ctr(struct skcipher_request *req)
 319 {
 320         return crypto4xx_ctr_crypt(req, false);
 321 }
 322
 323 static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
 324                                                 unsigned int len,
 325                                                 bool is_ccm, bool decrypt)
 326 {
 327         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 328
 329         /* authsize has to be a multiple of 4 */
 330         if (aead->authsize & 3)
 331                 return true;
 332
 333         /*
 334          * hardware does not handle cases where plaintext
 335          * is less than a block.
 336          */
 337         if (len < AES_BLOCK_SIZE)
 338                 return true;
 339
 340         /* assoc len needs to be a multiple of 4 and <= 1020 */
 341         if (req->assoclen & 0x3 || req->assoclen > 1020)
 342                 return true;
 343
 344         /* CCM supports only counter field length of 2 and 4 bytes */
 345         if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
 346                 return true;
 347
 348         return false;
 349 }
 350
 351 static int crypto4xx_aead_fallback(struct aead_request *req,
 352         struct crypto4xx_ctx *ctx, bool do_decrypt)
 353 {
 354         struct aead_request *subreq = aead_request_ctx(req);
 355
 356         aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
 357         aead_request_set_callback(subreq, req->base.flags,
 358                                   req->base.complete, req->base.data);
 359         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 360                                req->iv);
 361         aead_request_set_ad(subreq, req->assoclen);
 362         return do_decrypt ? crypto_aead_decrypt(subreq) :
 363                             crypto_aead_encrypt(subreq);
 364 }
 365
 366 static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
 367                                          struct crypto_aead *cipher,
 368                                          const u8 *key,
 369                                          unsigned int keylen)
 370 {
 371         int rc;
 372
 373         crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
 374         crypto_aead_set_flags(ctx->sw_cipher.aead,
 375                 crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 376         rc = crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
 377         crypto_aead_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 378         crypto_aead_set_flags(cipher,
 379                 crypto_aead_get_flags(ctx->sw_cipher.aead) &
 380                         CRYPTO_TFM_RES_MASK);
 381
 382         return rc;
 383 }
 384
 385 /**
 386  * AES-CCM Functions
 387  */
 388
 389 int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
 390                              unsigned int keylen)
 391 {
 392         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 393         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 394         struct dynamic_sa_ctl *sa;
 395         int rc = 0;
 396
 397         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 398         if (rc)
 399                 return rc;
 400
 401         if (ctx->sa_in || ctx->sa_out)
 402                 crypto4xx_free_sa(ctx);
 403
 404         rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
 405         if (rc)
 406                 return rc;
 407
 408         /* Setup SA */
 409         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 410         sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
 411
 412         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 413                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 414                                  SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 415                                  SA_CIPHER_ALG_AES,
 416                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 417                                  SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);
 418
 419         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 420                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 421                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 422                                  SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 423                                  SA_NOT_COPY_HDR);
 424
 425         sa->sa_command_1.bf.key_len = keylen >> 3;
 426
 427         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);
 428
 429         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 430         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 431
 432         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 433                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 434                                  SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 435                                  SA_CIPHER_ALG_AES,
 436                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 437                                  SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);
 438
 439         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 440                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 441                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 442                                  SA_COPY_PAD, SA_COPY_PAYLOAD,
 443                                  SA_NOT_COPY_HDR);
 444
 445         sa->sa_command_1.bf.key_len = keylen >> 3;
 446         return 0;
 447 }
 448
 449 static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
 450 {
 451         struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
 452         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 453         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 454         __le32 iv[16];
 455         u32 tmp_sa[SA_AES128_CCM_LEN + 4];
 456         struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
 457         unsigned int len = req->cryptlen;
 458
 459         if (decrypt)
 460                 len -= crypto_aead_authsize(aead);
 461
 462         if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
 463                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 464
 465         memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
 466         sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
 467
 468         if (req->iv[0] == 1) {
 469                 /* CRYPTO_MODE_AES_ICM */
 470                 sa->sa_command_1.bf.crypto_mode9_8 = 1;
 471         }
 472
 473         iv[3] = cpu_to_le32(0);
 474         crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));
 475
 476         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 477                                   len, iv, sizeof(iv),
 478                                   sa, ctx->sa_len, req->assoclen, rctx->dst);
 479 }
 480
 481 int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
 482 {
 483         return crypto4xx_crypt_aes_ccm(req, false);
 484 }
 485
 486 int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
 487 {
 488         return crypto4xx_crypt_aes_ccm(req, true);
 489 }
 490
 491 int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
 492                                unsigned int authsize)
 493 {
 494         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 495         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 496
 497         return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
 498 }
 499
 500 /**
 501  * AES-GCM Functions
 502  */
 503
 504 static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
 505 {
 506         switch (keylen) {
 507         case 16:
 508         case 24:
 509         case 32:
 510                 return 0;
 511         default:
 512                 return -EINVAL;
 513         }
 514 }
 515
 516 static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
 517                                              unsigned int keylen)
 518 {
 519         struct crypto_cipher *aes_tfm = NULL;
 520         uint8_t src[16] = { 0 };
 521         int rc = 0;
 522
 523         aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC |
 524                                       CRYPTO_ALG_NEED_FALLBACK);
 525         if (IS_ERR(aes_tfm)) {
 526                 rc = PTR_ERR(aes_tfm);
 527                 pr_warn("could not load aes cipher driver: %d\n", rc);
 528                 return rc;
 529         }
 530
 531         rc = crypto_cipher_setkey(aes_tfm, key, keylen);
 532         if (rc) {
 533                 pr_err("setkey() failed: %d\n", rc);
 534                 goto out;
 535         }
 536
 537         crypto_cipher_encrypt_one(aes_tfm, src, src);
 538         crypto4xx_memcpy_to_le32(hash_start, src, 16);
 539 out:
 540         crypto_free_cipher(aes_tfm);
 541         return rc;
 542 }
 543
 544 int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
 545                              const u8 *key, unsigned int keylen)
 546 {
 547         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 548         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 549         struct dynamic_sa_ctl *sa;
 550         int    rc = 0;
 551
 552         if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0) {
 553                 crypto_aead_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 554                 return -EINVAL;
 555         }
 556
 557         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 558         if (rc)
 559                 return rc;
 560
 561         if (ctx->sa_in || ctx->sa_out)
 562                 crypto4xx_free_sa(ctx);
 563
 564         rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
 565         if (rc)
 566                 return rc;
 567
 568         sa  = (struct dynamic_sa_ctl *) ctx->sa_in;
 569
 570         sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
 571         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 572                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 573                                  SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
 574                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 575                                  SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
 576                                  DIR_INBOUND);
 577         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 578                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 579                                  SA_SEQ_MASK_ON, SA_MC_DISABLE,
 580                                  SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 581                                  SA_NOT_COPY_HDR);
 582
 583         sa->sa_command_1.bf.key_len = keylen >> 3;
 584
 585         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 586                                  key, keylen);
 587
 588         rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
 589                 key, keylen);
 590         if (rc) {
 591                 pr_err("GCM hash key setting failed = %d\n", rc);
 592                 goto err;
 593         }
 594
 595         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 596         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 597         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 598         sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;
 599
 600         return 0;
 601 err:
 602         crypto4xx_free_sa(ctx);
 603         return rc;
 604 }
 605
 606 static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
 607                                           bool decrypt)
 608 {
 609         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 610         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 611         __le32 iv[4];
 612         unsigned int len = req->cryptlen;
 613
 614         if (decrypt)
 615                 len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
 616
 617         if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
 618                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 619
 620         crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
 621         iv[3] = cpu_to_le32(1);
 622
 623         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 624                                   len, iv, sizeof(iv),
 625                                   decrypt ? ctx->sa_in : ctx->sa_out,
 626                                   ctx->sa_len, req->assoclen, rctx->dst);
 627 }
 628
 629 int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
 630 {
 631         return crypto4xx_crypt_aes_gcm(req, false);
 632 }
 633
 634 int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
 635 {
 636         return crypto4xx_crypt_aes_gcm(req, true);
 637 }
 638
 639 /**
 640  * HASH SHA1 Functions
 641  */
 642 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
 643                                    unsigned int sa_len,
 644                                    unsigned char ha,
 645                                    unsigned char hm)
 646 {
 647         struct crypto_alg *alg = tfm->__crt_alg;
 648         struct crypto4xx_alg *my_alg;
 649         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 650         struct dynamic_sa_hash160 *sa;
 651         int rc;
 652
 653         my_alg = container_of(__crypto_ahash_alg(alg), struct crypto4xx_alg,
 654                               alg.u.hash);
 655         ctx->dev   = my_alg->dev;
 656
 657         /* Create SA */
 658         if (ctx->sa_in || ctx->sa_out)
 659                 crypto4xx_free_sa(ctx);
 660
 661         rc = crypto4xx_alloc_sa(ctx, sa_len);
 662         if (rc)
 663                 return rc;
 664
 665         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 666                                  sizeof(struct crypto4xx_ctx));
 667         sa = (struct dynamic_sa_hash160 *)ctx->sa_in;
 668         set_dynamic_sa_command_0(&sa->ctrl, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 669                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
 670                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
 671                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 672                                  SA_OPCODE_HASH, DIR_INBOUND);
 673         set_dynamic_sa_command_1(&sa->ctrl, 0, SA_HASH_MODE_HASH,
 674                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 675                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 676                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 677                                  SA_NOT_COPY_HDR);
 678         /* Need to zero hash digest in SA */
 679         memset(sa->inner_digest, 0, sizeof(sa->inner_digest));
 680         memset(sa->outer_digest, 0, sizeof(sa->outer_digest));
 681
 682         return 0;
 683 }
 684
 685 int crypto4xx_hash_init(struct ahash_request *req)
 686 {
 687         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 688         int ds;
 689         struct dynamic_sa_ctl *sa;
 690
 691         sa = ctx->sa_in;
 692         ds = crypto_ahash_digestsize(
 693                         __crypto_ahash_cast(req->base.tfm));
 694         sa->sa_command_0.bf.digest_len = ds >> 2;
 695         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
 696
 697         return 0;
 698 }
 699
 700 int crypto4xx_hash_update(struct ahash_request *req)
 701 {
 702         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 703         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 704         struct scatterlist dst;
 705         unsigned int ds = crypto_ahash_digestsize(ahash);
 706
 707         sg_init_one(&dst, req->result, ds);
 708
 709         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 710                                   req->nbytes, NULL, 0, ctx->sa_in,
 711                                   ctx->sa_len, 0, NULL);
 712 }
 713
 714 int crypto4xx_hash_final(struct ahash_request *req)
 715 {
 716         return 0;
 717 }
 718
 719 int crypto4xx_hash_digest(struct ahash_request *req)
 720 {
 721         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 722         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 723         struct scatterlist dst;
 724         unsigned int ds = crypto_ahash_digestsize(ahash);
 725
 726         sg_init_one(&dst, req->result, ds);
 727
 728         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 729                                   req->nbytes, NULL, 0, ctx->sa_in,
 730                                   ctx->sa_len, 0, NULL);
 731 }
 732
 733 /**
 734  * SHA1 Algorithm
 735  */
 736 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
 737 {
 738         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
 739                                        SA_HASH_MODE_HASH);
 740 }