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                                   bool check_blocksize)
  81 {
  82         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
  83         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
  84         __le32 iv[AES_IV_SIZE];
  85
  86         if (check_blocksize && !IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE))
  87                 return -EINVAL;
  88
  89         if (ivlen)
  90                 crypto4xx_memcpy_to_le32(iv, req->iv, ivlen);
  91
  92         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  93                 req->cryptlen, iv, ivlen, decrypt ? ctx->sa_in : ctx->sa_out,
  94                 ctx->sa_len, 0, NULL);
  95 }
  96
  97 int crypto4xx_encrypt_noiv_block(struct skcipher_request *req)
  98 {
  99         return crypto4xx_crypt(req, 0, false, true);
 100 }
 101
 102 int crypto4xx_encrypt_iv_stream(struct skcipher_request *req)
 103 {
 104         return crypto4xx_crypt(req, AES_IV_SIZE, false, false);
 105 }
 106
 107 int crypto4xx_decrypt_noiv_block(struct skcipher_request *req)
 108 {
 109         return crypto4xx_crypt(req, 0, true, true);
 110 }
 111
 112 int crypto4xx_decrypt_iv_stream(struct skcipher_request *req)
 113 {
 114         return crypto4xx_crypt(req, AES_IV_SIZE, true, false);
 115 }
 116
 117 int crypto4xx_encrypt_iv_block(struct skcipher_request *req)
 118 {
 119         return crypto4xx_crypt(req, AES_IV_SIZE, false, true);
 120 }
 121
 122 int crypto4xx_decrypt_iv_block(struct skcipher_request *req)
 123 {
 124         return crypto4xx_crypt(req, AES_IV_SIZE, true, true);
 125 }
 126
 127 /**
 128  * AES Functions
 129  */
 130 static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher,
 131                                 const u8 *key,
 132                                 unsigned int keylen,
 133                                 unsigned char cm,
 134                                 u8 fb)
 135 {
 136         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 137         struct dynamic_sa_ctl *sa;
 138         int    rc;
 139
 140         if (keylen != AES_KEYSIZE_256 &&
 141                 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
 142                 crypto_skcipher_set_flags(cipher,
 143                                 CRYPTO_TFM_RES_BAD_KEY_LEN);
 144                 return -EINVAL;
 145         }
 146
 147         /* Create SA */
 148         if (ctx->sa_in || ctx->sa_out)
 149                 crypto4xx_free_sa(ctx);
 150
 151         rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
 152         if (rc)
 153                 return rc;
 154
 155         /* Setup SA */
 156         sa = ctx->sa_in;
 157
 158         set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_ECB ?
 159                                  SA_NOT_SAVE_IV : SA_SAVE_IV),
 160                                  SA_NOT_LOAD_HASH, (cm == CRYPTO_MODE_ECB ?
 161                                  SA_LOAD_IV_FROM_SA : SA_LOAD_IV_FROM_STATE),
 162                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
 163                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 164                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
 165                                  DIR_INBOUND);
 166
 167         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
 168                                  fb, SA_EXTENDED_SN_OFF,
 169                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 170                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 171                                  SA_NOT_COPY_HDR);
 172         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 173                                  key, keylen);
 174         sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
 175         sa->sa_command_1.bf.key_len = keylen >> 3;
 176
 177         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 178         sa = ctx->sa_out;
 179         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 180         /*
 181          * SA_OPCODE_ENCRYPT is the same value as SA_OPCODE_DECRYPT.
 182          * it's the DIR_(IN|OUT)BOUND that matters
 183          */
 184         sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT;
 185
 186         return 0;
 187 }
 188
 189 int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
 190                              const u8 *key, unsigned int keylen)
 191 {
 192         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
 193                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 194 }
 195
 196 int crypto4xx_setkey_aes_cfb(struct crypto_skcipher *cipher,
 197                              const u8 *key, unsigned int keylen)
 198 {
 199         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CFB,
 200                                     CRYPTO_FEEDBACK_MODE_128BIT_CFB);
 201 }
 202
 203 int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
 204                              const u8 *key, unsigned int keylen)
 205 {
 206         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
 207                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 208 }
 209
 210 int crypto4xx_setkey_aes_ofb(struct crypto_skcipher *cipher,
 211                              const u8 *key, unsigned int keylen)
 212 {
 213         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_OFB,
 214                                     CRYPTO_FEEDBACK_MODE_64BIT_OFB);
 215 }
 216
 217 int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
 218                              const u8 *key, unsigned int keylen)
 219 {
 220         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 221         int rc;
 222
 223         rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
 224                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 225         if (rc)
 226                 return rc;
 227
 228         ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
 229                                                  CTR_RFC3686_NONCE_SIZE]);
 230
 231         return 0;
 232 }
 233
 234 int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
 235 {
 236         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 237         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 238         __le32 iv[AES_IV_SIZE / 4] = {
 239                 ctx->iv_nonce,
 240                 cpu_to_le32p((u32 *) req->iv),
 241                 cpu_to_le32p((u32 *) (req->iv + 4)),
 242                 cpu_to_le32(1) };
 243
 244         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 245                                   req->cryptlen, iv, AES_IV_SIZE,
 246                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 247 }
 248
 249 int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
 250 {
 251         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 252         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 253         __le32 iv[AES_IV_SIZE / 4] = {
 254                 ctx->iv_nonce,
 255                 cpu_to_le32p((u32 *) req->iv),
 256                 cpu_to_le32p((u32 *) (req->iv + 4)),
 257                 cpu_to_le32(1) };
 258
 259         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 260                                   req->cryptlen, iv, AES_IV_SIZE,
 261                                   ctx->sa_out, ctx->sa_len, 0, NULL);
 262 }
 263
 264 static int
 265 crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
 266 {
 267         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 268         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 269         size_t iv_len = crypto_skcipher_ivsize(cipher);
 270         unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
 271         unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
 272                         AES_BLOCK_SIZE;
 273
 274         /*
 275          * The hardware uses only the last 32-bits as the counter while the
 276          * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
 277          * the whole IV is a counter.  So fallback if the counter is going to
 278          * overlow.
 279          */
 280         if (counter + nblks < counter) {
 281                 struct skcipher_request *subreq = skcipher_request_ctx(req);
 282                 int ret;
 283
 284                 skcipher_request_set_tfm(subreq, ctx->sw_cipher.cipher);
 285                 skcipher_request_set_callback(subreq, req->base.flags,
 286                         NULL, NULL);
 287                 skcipher_request_set_crypt(subreq, req->src, req->dst,
 288                         req->cryptlen, req->iv);
 289                 ret = encrypt ? crypto_skcipher_encrypt(subreq)
 290                         : crypto_skcipher_decrypt(subreq);
 291                 skcipher_request_zero(subreq);
 292                 return ret;
 293         }
 294
 295         return encrypt ? crypto4xx_encrypt_iv_stream(req)
 296                        : crypto4xx_decrypt_iv_stream(req);
 297 }
 298
 299 static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
 300                                        struct crypto_skcipher *cipher,
 301                                        const u8 *key,
 302                                        unsigned int keylen)
 303 {
 304         int rc;
 305
 306         crypto_skcipher_clear_flags(ctx->sw_cipher.cipher,
 307                                     CRYPTO_TFM_REQ_MASK);
 308         crypto_skcipher_set_flags(ctx->sw_cipher.cipher,
 309                 crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 310         rc = crypto_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
 311         crypto_skcipher_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 312         crypto_skcipher_set_flags(cipher,
 313                 crypto_skcipher_get_flags(ctx->sw_cipher.cipher) &
 314                         CRYPTO_TFM_RES_MASK);
 315
 316         return rc;
 317 }
 318
 319 int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
 320                              const u8 *key, unsigned int keylen)
 321 {
 322         struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 323         int rc;
 324
 325         rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
 326         if (rc)
 327                 return rc;
 328
 329         return crypto4xx_setkey_aes(cipher, key, keylen,
 330                 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
 331 }
 332
 333 int crypto4xx_encrypt_ctr(struct skcipher_request *req)
 334 {
 335         return crypto4xx_ctr_crypt(req, true);
 336 }
 337
 338 int crypto4xx_decrypt_ctr(struct skcipher_request *req)
 339 {
 340         return crypto4xx_ctr_crypt(req, false);
 341 }
 342
 343 static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
 344                                                 unsigned int len,
 345                                                 bool is_ccm, bool decrypt)
 346 {
 347         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 348
 349         /* authsize has to be a multiple of 4 */
 350         if (aead->authsize & 3)
 351                 return true;
 352
 353         /*
 354          * hardware does not handle cases where plaintext
 355          * is less than a block.
 356          */
 357         if (len < AES_BLOCK_SIZE)
 358                 return true;
 359
 360         /* assoc len needs to be a multiple of 4 and <= 1020 */
 361         if (req->assoclen & 0x3 || req->assoclen > 1020)
 362                 return true;
 363
 364         /* CCM supports only counter field length of 2 and 4 bytes */
 365         if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
 366                 return true;
 367
 368         return false;
 369 }
 370
 371 static int crypto4xx_aead_fallback(struct aead_request *req,
 372         struct crypto4xx_ctx *ctx, bool do_decrypt)
 373 {
 374         struct aead_request *subreq = aead_request_ctx(req);
 375
 376         aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
 377         aead_request_set_callback(subreq, req->base.flags,
 378                                   req->base.complete, req->base.data);
 379         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 380                                req->iv);
 381         aead_request_set_ad(subreq, req->assoclen);
 382         return do_decrypt ? crypto_aead_decrypt(subreq) :
 383                             crypto_aead_encrypt(subreq);
 384 }
 385
 386 static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
 387                                          struct crypto_aead *cipher,
 388                                          const u8 *key,
 389                                          unsigned int keylen)
 390 {
 391         int rc;
 392
 393         crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
 394         crypto_aead_set_flags(ctx->sw_cipher.aead,
 395                 crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
 396         rc = crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
 397         crypto_aead_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 398         crypto_aead_set_flags(cipher,
 399                 crypto_aead_get_flags(ctx->sw_cipher.aead) &
 400                         CRYPTO_TFM_RES_MASK);
 401
 402         return rc;
 403 }
 404
 405 /**
 406  * AES-CCM Functions
 407  */
 408
 409 int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
 410                              unsigned int keylen)
 411 {
 412         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 413         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 414         struct dynamic_sa_ctl *sa;
 415         int rc = 0;
 416
 417         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 418         if (rc)
 419                 return rc;
 420
 421         if (ctx->sa_in || ctx->sa_out)
 422                 crypto4xx_free_sa(ctx);
 423
 424         rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
 425         if (rc)
 426                 return rc;
 427
 428         /* Setup SA */
 429         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 430         sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
 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_HASH_DECRYPT, DIR_INBOUND);
 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_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 443                                  SA_NOT_COPY_HDR);
 444
 445         sa->sa_command_1.bf.key_len = keylen >> 3;
 446
 447         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);
 448
 449         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 450         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 451
 452         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 453                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 454                                  SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 455                                  SA_CIPHER_ALG_AES,
 456                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 457                                  SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);
 458
 459         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 460                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 461                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 462                                  SA_COPY_PAD, SA_COPY_PAYLOAD,
 463                                  SA_NOT_COPY_HDR);
 464
 465         sa->sa_command_1.bf.key_len = keylen >> 3;
 466         return 0;
 467 }
 468
 469 static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
 470 {
 471         struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
 472         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 473         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 474         __le32 iv[16];
 475         u32 tmp_sa[SA_AES128_CCM_LEN + 4];
 476         struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
 477         unsigned int len = req->cryptlen;
 478
 479         if (decrypt)
 480                 len -= crypto_aead_authsize(aead);
 481
 482         if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
 483                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 484
 485         memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
 486         sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
 487
 488         if (req->iv[0] == 1) {
 489                 /* CRYPTO_MODE_AES_ICM */
 490                 sa->sa_command_1.bf.crypto_mode9_8 = 1;
 491         }
 492
 493         iv[3] = cpu_to_le32(0);
 494         crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));
 495
 496         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 497                                   len, iv, sizeof(iv),
 498                                   sa, ctx->sa_len, req->assoclen, rctx->dst);
 499 }
 500
 501 int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
 502 {
 503         return crypto4xx_crypt_aes_ccm(req, false);
 504 }
 505
 506 int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
 507 {
 508         return crypto4xx_crypt_aes_ccm(req, true);
 509 }
 510
 511 int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
 512                                unsigned int authsize)
 513 {
 514         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 515         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 516
 517         return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
 518 }
 519
 520 /**
 521  * AES-GCM Functions
 522  */
 523
 524 static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
 525 {
 526         switch (keylen) {
 527         case 16:
 528         case 24:
 529         case 32:
 530                 return 0;
 531         default:
 532                 return -EINVAL;
 533         }
 534 }
 535
 536 static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
 537                                              unsigned int keylen)
 538 {
 539         struct crypto_cipher *aes_tfm = NULL;
 540         uint8_t src[16] = { 0 };
 541         int rc = 0;
 542
 543         aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC |
 544                                       CRYPTO_ALG_NEED_FALLBACK);
 545         if (IS_ERR(aes_tfm)) {
 546                 rc = PTR_ERR(aes_tfm);
 547                 pr_warn("could not load aes cipher driver: %d\n", rc);
 548                 return rc;
 549         }
 550
 551         rc = crypto_cipher_setkey(aes_tfm, key, keylen);
 552         if (rc) {
 553                 pr_err("setkey() failed: %d\n", rc);
 554                 goto out;
 555         }
 556
 557         crypto_cipher_encrypt_one(aes_tfm, src, src);
 558         crypto4xx_memcpy_to_le32(hash_start, src, 16);
 559 out:
 560         crypto_free_cipher(aes_tfm);
 561         return rc;
 562 }
 563
 564 int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
 565                              const u8 *key, unsigned int keylen)
 566 {
 567         struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 568         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 569         struct dynamic_sa_ctl *sa;
 570         int    rc = 0;
 571
 572         if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0) {
 573                 crypto_aead_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 574                 return -EINVAL;
 575         }
 576
 577         rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
 578         if (rc)
 579                 return rc;
 580
 581         if (ctx->sa_in || ctx->sa_out)
 582                 crypto4xx_free_sa(ctx);
 583
 584         rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
 585         if (rc)
 586                 return rc;
 587
 588         sa  = (struct dynamic_sa_ctl *) ctx->sa_in;
 589
 590         sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
 591         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 592                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 593                                  SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
 594                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 595                                  SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
 596                                  DIR_INBOUND);
 597         set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 598                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 599                                  SA_SEQ_MASK_ON, SA_MC_DISABLE,
 600                                  SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 601                                  SA_NOT_COPY_HDR);
 602
 603         sa->sa_command_1.bf.key_len = keylen >> 3;
 604
 605         crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
 606                                  key, keylen);
 607
 608         rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
 609                 key, keylen);
 610         if (rc) {
 611                 pr_err("GCM hash key setting failed = %d\n", rc);
 612                 goto err;
 613         }
 614
 615         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 616         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 617         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 618         sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;
 619
 620         return 0;
 621 err:
 622         crypto4xx_free_sa(ctx);
 623         return rc;
 624 }
 625
 626 static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
 627                                           bool decrypt)
 628 {
 629         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 630         struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
 631         __le32 iv[4];
 632         unsigned int len = req->cryptlen;
 633
 634         if (decrypt)
 635                 len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
 636
 637         if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
 638                 return crypto4xx_aead_fallback(req, ctx, decrypt);
 639
 640         crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
 641         iv[3] = cpu_to_le32(1);
 642
 643         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 644                                   len, iv, sizeof(iv),
 645                                   decrypt ? ctx->sa_in : ctx->sa_out,
 646                                   ctx->sa_len, req->assoclen, rctx->dst);
 647 }
 648
 649 int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
 650 {
 651         return crypto4xx_crypt_aes_gcm(req, false);
 652 }
 653
 654 int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
 655 {
 656         return crypto4xx_crypt_aes_gcm(req, true);
 657 }
 658
 659 /**
 660  * HASH SHA1 Functions
 661  */
 662 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
 663                                    unsigned int sa_len,
 664                                    unsigned char ha,
 665                                    unsigned char hm)
 666 {
 667         struct crypto_alg *alg = tfm->__crt_alg;
 668         struct crypto4xx_alg *my_alg;
 669         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 670         struct dynamic_sa_hash160 *sa;
 671         int rc;
 672
 673         my_alg = container_of(__crypto_ahash_alg(alg), struct crypto4xx_alg,
 674                               alg.u.hash);
 675         ctx->dev   = my_alg->dev;
 676
 677         /* Create SA */
 678         if (ctx->sa_in || ctx->sa_out)
 679                 crypto4xx_free_sa(ctx);
 680
 681         rc = crypto4xx_alloc_sa(ctx, sa_len);
 682         if (rc)
 683                 return rc;
 684
 685         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 686                                  sizeof(struct crypto4xx_ctx));
 687         sa = (struct dynamic_sa_hash160 *)ctx->sa_in;
 688         set_dynamic_sa_command_0(&sa->ctrl, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 689                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
 690                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
 691                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 692                                  SA_OPCODE_HASH, DIR_INBOUND);
 693         set_dynamic_sa_command_1(&sa->ctrl, 0, SA_HASH_MODE_HASH,
 694                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 695                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 696                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 697                                  SA_NOT_COPY_HDR);
 698         /* Need to zero hash digest in SA */
 699         memset(sa->inner_digest, 0, sizeof(sa->inner_digest));
 700         memset(sa->outer_digest, 0, sizeof(sa->outer_digest));
 701
 702         return 0;
 703 }
 704
 705 int crypto4xx_hash_init(struct ahash_request *req)
 706 {
 707         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 708         int ds;
 709         struct dynamic_sa_ctl *sa;
 710
 711         sa = ctx->sa_in;
 712         ds = crypto_ahash_digestsize(
 713                         __crypto_ahash_cast(req->base.tfm));
 714         sa->sa_command_0.bf.digest_len = ds >> 2;
 715         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
 716
 717         return 0;
 718 }
 719
 720 int crypto4xx_hash_update(struct ahash_request *req)
 721 {
 722         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 723         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 724         struct scatterlist dst;
 725         unsigned int ds = crypto_ahash_digestsize(ahash);
 726
 727         sg_init_one(&dst, req->result, ds);
 728
 729         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 730                                   req->nbytes, NULL, 0, ctx->sa_in,
 731                                   ctx->sa_len, 0, NULL);
 732 }
 733
 734 int crypto4xx_hash_final(struct ahash_request *req)
 735 {
 736         return 0;
 737 }
 738
 739 int crypto4xx_hash_digest(struct ahash_request *req)
 740 {
 741         struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
 742         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 743         struct scatterlist dst;
 744         unsigned int ds = crypto_ahash_digestsize(ahash);
 745
 746         sg_init_one(&dst, req->result, ds);
 747
 748         return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
 749                                   req->nbytes, NULL, 0, ctx->sa_in,
 750                                   ctx->sa_len, 0, NULL);
 751 }
 752
 753 /**
 754  * SHA1 Algorithm
 755  */
 756 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
 757 {
 758         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
 759                                        SA_HASH_MODE_HASH);
 760 }