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 } 746