1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21d6b8a6fSTom Lendacky /* 31d6b8a6fSTom Lendacky * AMD Cryptographic Coprocessor (CCP) AES XTS crypto API support 41d6b8a6fSTom Lendacky * 5e652399eSGary R Hook * Copyright (C) 2013,2017 Advanced Micro Devices, Inc. 61d6b8a6fSTom Lendacky * 7e652399eSGary R Hook * Author: Gary R Hook <gary.hook@amd.com> 81d6b8a6fSTom Lendacky * Author: Tom Lendacky <thomas.lendacky@amd.com> 91d6b8a6fSTom Lendacky */ 101d6b8a6fSTom Lendacky 111d6b8a6fSTom Lendacky #include <linux/module.h> 121d6b8a6fSTom Lendacky #include <linux/sched.h> 131d6b8a6fSTom Lendacky #include <linux/delay.h> 141d6b8a6fSTom Lendacky #include <linux/scatterlist.h> 151d6b8a6fSTom Lendacky #include <crypto/aes.h> 1647f27f16SGary R Hook #include <crypto/xts.h> 17241118deSHerbert Xu #include <crypto/internal/skcipher.h> 181d6b8a6fSTom Lendacky #include <crypto/scatterwalk.h> 191d6b8a6fSTom Lendacky 201d6b8a6fSTom Lendacky #include "ccp-crypto.h" 211d6b8a6fSTom Lendacky 221d6b8a6fSTom Lendacky struct ccp_aes_xts_def { 231d6b8a6fSTom Lendacky const char *name; 241d6b8a6fSTom Lendacky const char *drv_name; 251d6b8a6fSTom Lendacky }; 261d6b8a6fSTom Lendacky 27be9fe620SArd Biesheuvel static const struct ccp_aes_xts_def aes_xts_algs[] = { 281d6b8a6fSTom Lendacky { 291d6b8a6fSTom Lendacky .name = "xts(aes)", 301d6b8a6fSTom Lendacky .drv_name = "xts-aes-ccp", 311d6b8a6fSTom Lendacky }, 321d6b8a6fSTom Lendacky }; 331d6b8a6fSTom Lendacky 341d6b8a6fSTom Lendacky struct ccp_unit_size_map { 351d6b8a6fSTom Lendacky unsigned int size; 361d6b8a6fSTom Lendacky u32 value; 371d6b8a6fSTom Lendacky }; 381d6b8a6fSTom Lendacky 397f7216cfSGary R Hook static struct ccp_unit_size_map xts_unit_sizes[] = { 401d6b8a6fSTom Lendacky { 417f7216cfSGary R Hook .size = 16, 427f7216cfSGary R Hook .value = CCP_XTS_AES_UNIT_SIZE_16, 431d6b8a6fSTom Lendacky }, 441d6b8a6fSTom Lendacky { 451d6b8a6fSTom Lendacky .size = 512, 461d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_512, 471d6b8a6fSTom Lendacky }, 481d6b8a6fSTom Lendacky { 497f7216cfSGary R Hook .size = 1024, 507f7216cfSGary R Hook .value = CCP_XTS_AES_UNIT_SIZE_1024, 511d6b8a6fSTom Lendacky }, 521d6b8a6fSTom Lendacky { 537f7216cfSGary R Hook .size = 2048, 547f7216cfSGary R Hook .value = CCP_XTS_AES_UNIT_SIZE_2048, 551d6b8a6fSTom Lendacky }, 561d6b8a6fSTom Lendacky { 577f7216cfSGary R Hook .size = 4096, 587f7216cfSGary R Hook .value = CCP_XTS_AES_UNIT_SIZE_4096, 591d6b8a6fSTom Lendacky }, 601d6b8a6fSTom Lendacky }; 611d6b8a6fSTom Lendacky 621d6b8a6fSTom Lendacky static int ccp_aes_xts_complete(struct crypto_async_request *async_req, int ret) 631d6b8a6fSTom Lendacky { 64be9fe620SArd Biesheuvel struct skcipher_request *req = skcipher_request_cast(async_req); 65be9fe620SArd Biesheuvel struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); 661d6b8a6fSTom Lendacky 671d6b8a6fSTom Lendacky if (ret) 681d6b8a6fSTom Lendacky return ret; 691d6b8a6fSTom Lendacky 70be9fe620SArd Biesheuvel memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE); 711d6b8a6fSTom Lendacky 721d6b8a6fSTom Lendacky return 0; 731d6b8a6fSTom Lendacky } 741d6b8a6fSTom Lendacky 75be9fe620SArd Biesheuvel static int ccp_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key, 761d6b8a6fSTom Lendacky unsigned int key_len) 771d6b8a6fSTom Lendacky { 78be9fe620SArd Biesheuvel struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); 795060ffc9SGary R Hook unsigned int ccpversion = ccp_version(); 8047f27f16SGary R Hook int ret; 8147f27f16SGary R Hook 82be9fe620SArd Biesheuvel ret = xts_verify_key(tfm, key, key_len); 8347f27f16SGary R Hook if (ret) 8447f27f16SGary R Hook return ret; 851d6b8a6fSTom Lendacky 865060ffc9SGary R Hook /* Version 3 devices support 128-bit keys; version 5 devices can 875060ffc9SGary R Hook * accommodate 128- and 256-bit keys. 881d6b8a6fSTom Lendacky */ 891d6b8a6fSTom Lendacky switch (key_len) { 901d6b8a6fSTom Lendacky case AES_KEYSIZE_128 * 2: 911d6b8a6fSTom Lendacky memcpy(ctx->u.aes.key, key, key_len); 921d6b8a6fSTom Lendacky break; 935060ffc9SGary R Hook case AES_KEYSIZE_256 * 2: 945060ffc9SGary R Hook if (ccpversion > CCP_VERSION(3, 0)) 955060ffc9SGary R Hook memcpy(ctx->u.aes.key, key, key_len); 965060ffc9SGary R Hook break; 971d6b8a6fSTom Lendacky } 981d6b8a6fSTom Lendacky ctx->u.aes.key_len = key_len / 2; 991d6b8a6fSTom Lendacky sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); 1001d6b8a6fSTom Lendacky 101413b61ceSArd Biesheuvel return crypto_skcipher_setkey(ctx->u.aes.tfm_skcipher, key, key_len); 1021d6b8a6fSTom Lendacky } 1031d6b8a6fSTom Lendacky 104be9fe620SArd Biesheuvel static int ccp_aes_xts_crypt(struct skcipher_request *req, 1051d6b8a6fSTom Lendacky unsigned int encrypt) 1061d6b8a6fSTom Lendacky { 107be9fe620SArd Biesheuvel struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 108be9fe620SArd Biesheuvel struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); 109be9fe620SArd Biesheuvel struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); 1105060ffc9SGary R Hook unsigned int ccpversion = ccp_version(); 1115060ffc9SGary R Hook unsigned int fallback = 0; 1121d6b8a6fSTom Lendacky unsigned int unit; 113ab6a11a7STom Lendacky u32 unit_size; 1141d6b8a6fSTom Lendacky int ret; 1151d6b8a6fSTom Lendacky 116369f3dabSTom Lendacky if (!ctx->u.aes.key_len) 1171d6b8a6fSTom Lendacky return -EINVAL; 1181d6b8a6fSTom Lendacky 119be9fe620SArd Biesheuvel if (!req->iv) 1201d6b8a6fSTom Lendacky return -EINVAL; 1211d6b8a6fSTom Lendacky 1227f7216cfSGary R Hook /* Check conditions under which the CCP can fulfill a request. The 1237f7216cfSGary R Hook * device can handle input plaintext of a length that is a multiple 1247f7216cfSGary R Hook * of the unit_size, bug the crypto implementation only supports 1257f7216cfSGary R Hook * the unit_size being equal to the input length. This limits the 1267f7216cfSGary R Hook * number of scenarios we can handle. 1277f7216cfSGary R Hook */ 128ab6a11a7STom Lendacky unit_size = CCP_XTS_AES_UNIT_SIZE__LAST; 1297f7216cfSGary R Hook for (unit = 0; unit < ARRAY_SIZE(xts_unit_sizes); unit++) { 130be9fe620SArd Biesheuvel if (req->cryptlen == xts_unit_sizes[unit].size) { 1317f7216cfSGary R Hook unit_size = unit; 1321d6b8a6fSTom Lendacky break; 133ab6a11a7STom Lendacky } 134ab6a11a7STom Lendacky } 1355060ffc9SGary R Hook /* The CCP has restrictions on block sizes. Also, a version 3 device 1365060ffc9SGary R Hook * only supports AES-128 operations; version 5 CCPs support both 1375060ffc9SGary R Hook * AES-128 and -256 operations. 1385060ffc9SGary R Hook */ 1395060ffc9SGary R Hook if (unit_size == CCP_XTS_AES_UNIT_SIZE__LAST) 1405060ffc9SGary R Hook fallback = 1; 1415060ffc9SGary R Hook if ((ccpversion < CCP_VERSION(5, 0)) && 1425060ffc9SGary R Hook (ctx->u.aes.key_len != AES_KEYSIZE_128)) 1435060ffc9SGary R Hook fallback = 1; 1445060ffc9SGary R Hook if ((ctx->u.aes.key_len != AES_KEYSIZE_128) && 1455060ffc9SGary R Hook (ctx->u.aes.key_len != AES_KEYSIZE_256)) 1465060ffc9SGary R Hook fallback = 1; 1475060ffc9SGary R Hook if (fallback) { 1481d6b8a6fSTom Lendacky /* Use the fallback to process the request for any 1491d6b8a6fSTom Lendacky * unsupported unit sizes or key sizes 1501d6b8a6fSTom Lendacky */ 151413b61ceSArd Biesheuvel skcipher_request_set_tfm(&rctx->fallback_req, 152413b61ceSArd Biesheuvel ctx->u.aes.tfm_skcipher); 153413b61ceSArd Biesheuvel skcipher_request_set_callback(&rctx->fallback_req, 154413b61ceSArd Biesheuvel req->base.flags, 155413b61ceSArd Biesheuvel req->base.complete, 156413b61ceSArd Biesheuvel req->base.data); 157413b61ceSArd Biesheuvel skcipher_request_set_crypt(&rctx->fallback_req, req->src, 158413b61ceSArd Biesheuvel req->dst, req->cryptlen, req->iv); 159413b61ceSArd Biesheuvel ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) : 160413b61ceSArd Biesheuvel crypto_skcipher_decrypt(&rctx->fallback_req); 1611d6b8a6fSTom Lendacky return ret; 1621d6b8a6fSTom Lendacky } 1631d6b8a6fSTom Lendacky 164be9fe620SArd Biesheuvel memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE); 1651d6b8a6fSTom Lendacky sg_init_one(&rctx->iv_sg, rctx->iv, AES_BLOCK_SIZE); 1661d6b8a6fSTom Lendacky 1671d6b8a6fSTom Lendacky memset(&rctx->cmd, 0, sizeof(rctx->cmd)); 1681d6b8a6fSTom Lendacky INIT_LIST_HEAD(&rctx->cmd.entry); 1691d6b8a6fSTom Lendacky rctx->cmd.engine = CCP_ENGINE_XTS_AES_128; 170e652399eSGary R Hook rctx->cmd.u.xts.type = CCP_AES_TYPE_128; 1711d6b8a6fSTom Lendacky rctx->cmd.u.xts.action = (encrypt) ? CCP_AES_ACTION_ENCRYPT 1721d6b8a6fSTom Lendacky : CCP_AES_ACTION_DECRYPT; 173ab6a11a7STom Lendacky rctx->cmd.u.xts.unit_size = unit_size; 1741d6b8a6fSTom Lendacky rctx->cmd.u.xts.key = &ctx->u.aes.key_sg; 1751d6b8a6fSTom Lendacky rctx->cmd.u.xts.key_len = ctx->u.aes.key_len; 1761d6b8a6fSTom Lendacky rctx->cmd.u.xts.iv = &rctx->iv_sg; 1771d6b8a6fSTom Lendacky rctx->cmd.u.xts.iv_len = AES_BLOCK_SIZE; 1781d6b8a6fSTom Lendacky rctx->cmd.u.xts.src = req->src; 179be9fe620SArd Biesheuvel rctx->cmd.u.xts.src_len = req->cryptlen; 1801d6b8a6fSTom Lendacky rctx->cmd.u.xts.dst = req->dst; 1811d6b8a6fSTom Lendacky 1821d6b8a6fSTom Lendacky ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); 1831d6b8a6fSTom Lendacky 1841d6b8a6fSTom Lendacky return ret; 1851d6b8a6fSTom Lendacky } 1861d6b8a6fSTom Lendacky 187be9fe620SArd Biesheuvel static int ccp_aes_xts_encrypt(struct skcipher_request *req) 1881d6b8a6fSTom Lendacky { 1891d6b8a6fSTom Lendacky return ccp_aes_xts_crypt(req, 1); 1901d6b8a6fSTom Lendacky } 1911d6b8a6fSTom Lendacky 192be9fe620SArd Biesheuvel static int ccp_aes_xts_decrypt(struct skcipher_request *req) 1931d6b8a6fSTom Lendacky { 1941d6b8a6fSTom Lendacky return ccp_aes_xts_crypt(req, 0); 1951d6b8a6fSTom Lendacky } 1961d6b8a6fSTom Lendacky 197be9fe620SArd Biesheuvel static int ccp_aes_xts_init_tfm(struct crypto_skcipher *tfm) 1981d6b8a6fSTom Lendacky { 199be9fe620SArd Biesheuvel struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); 200413b61ceSArd Biesheuvel struct crypto_skcipher *fallback_tfm; 2011d6b8a6fSTom Lendacky 2021d6b8a6fSTom Lendacky ctx->complete = ccp_aes_xts_complete; 2031d6b8a6fSTom Lendacky ctx->u.aes.key_len = 0; 2041d6b8a6fSTom Lendacky 205413b61ceSArd Biesheuvel fallback_tfm = crypto_alloc_skcipher("xts(aes)", 0, 2061d6b8a6fSTom Lendacky CRYPTO_ALG_NEED_FALLBACK); 2071d6b8a6fSTom Lendacky if (IS_ERR(fallback_tfm)) { 208241118deSHerbert Xu pr_warn("could not load fallback driver xts(aes)\n"); 2091d6b8a6fSTom Lendacky return PTR_ERR(fallback_tfm); 2101d6b8a6fSTom Lendacky } 211241118deSHerbert Xu ctx->u.aes.tfm_skcipher = fallback_tfm; 2121d6b8a6fSTom Lendacky 213413b61ceSArd Biesheuvel crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx) + 214413b61ceSArd Biesheuvel crypto_skcipher_reqsize(fallback_tfm)); 2151d6b8a6fSTom Lendacky 2161d6b8a6fSTom Lendacky return 0; 2171d6b8a6fSTom Lendacky } 2181d6b8a6fSTom Lendacky 219be9fe620SArd Biesheuvel static void ccp_aes_xts_exit_tfm(struct crypto_skcipher *tfm) 2201d6b8a6fSTom Lendacky { 221be9fe620SArd Biesheuvel struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); 2221d6b8a6fSTom Lendacky 223413b61ceSArd Biesheuvel crypto_free_skcipher(ctx->u.aes.tfm_skcipher); 2241d6b8a6fSTom Lendacky } 2251d6b8a6fSTom Lendacky 2261d6b8a6fSTom Lendacky static int ccp_register_aes_xts_alg(struct list_head *head, 2271d6b8a6fSTom Lendacky const struct ccp_aes_xts_def *def) 2281d6b8a6fSTom Lendacky { 229be9fe620SArd Biesheuvel struct ccp_crypto_skcipher_alg *ccp_alg; 230be9fe620SArd Biesheuvel struct skcipher_alg *alg; 2311d6b8a6fSTom Lendacky int ret; 2321d6b8a6fSTom Lendacky 2331d6b8a6fSTom Lendacky ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); 2341d6b8a6fSTom Lendacky if (!ccp_alg) 2351d6b8a6fSTom Lendacky return -ENOMEM; 2361d6b8a6fSTom Lendacky 2371d6b8a6fSTom Lendacky INIT_LIST_HEAD(&ccp_alg->entry); 2381d6b8a6fSTom Lendacky 2391d6b8a6fSTom Lendacky alg = &ccp_alg->alg; 2401d6b8a6fSTom Lendacky 241be9fe620SArd Biesheuvel snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 242be9fe620SArd Biesheuvel snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 2431d6b8a6fSTom Lendacky def->drv_name); 244be9fe620SArd Biesheuvel alg->base.cra_flags = CRYPTO_ALG_ASYNC | 245b8aa7dc5SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY | 2461d6b8a6fSTom Lendacky CRYPTO_ALG_KERN_DRIVER_ONLY | 2471d6b8a6fSTom Lendacky CRYPTO_ALG_NEED_FALLBACK; 248be9fe620SArd Biesheuvel alg->base.cra_blocksize = AES_BLOCK_SIZE; 249be9fe620SArd Biesheuvel alg->base.cra_ctxsize = sizeof(struct ccp_ctx); 250be9fe620SArd Biesheuvel alg->base.cra_priority = CCP_CRA_PRIORITY; 251be9fe620SArd Biesheuvel alg->base.cra_module = THIS_MODULE; 2521d6b8a6fSTom Lendacky 253be9fe620SArd Biesheuvel alg->setkey = ccp_aes_xts_setkey; 254be9fe620SArd Biesheuvel alg->encrypt = ccp_aes_xts_encrypt; 255be9fe620SArd Biesheuvel alg->decrypt = ccp_aes_xts_decrypt; 256be9fe620SArd Biesheuvel alg->min_keysize = AES_MIN_KEY_SIZE * 2; 257be9fe620SArd Biesheuvel alg->max_keysize = AES_MAX_KEY_SIZE * 2; 258be9fe620SArd Biesheuvel alg->ivsize = AES_BLOCK_SIZE; 259be9fe620SArd Biesheuvel alg->init = ccp_aes_xts_init_tfm; 260be9fe620SArd Biesheuvel alg->exit = ccp_aes_xts_exit_tfm; 261be9fe620SArd Biesheuvel 262be9fe620SArd Biesheuvel ret = crypto_register_skcipher(alg); 2631d6b8a6fSTom Lendacky if (ret) { 264be9fe620SArd Biesheuvel pr_err("%s skcipher algorithm registration error (%d)\n", 265be9fe620SArd Biesheuvel alg->base.cra_name, ret); 2661d6b8a6fSTom Lendacky kfree(ccp_alg); 2671d6b8a6fSTom Lendacky return ret; 2681d6b8a6fSTom Lendacky } 2691d6b8a6fSTom Lendacky 2701d6b8a6fSTom Lendacky list_add(&ccp_alg->entry, head); 2711d6b8a6fSTom Lendacky 2721d6b8a6fSTom Lendacky return 0; 2731d6b8a6fSTom Lendacky } 2741d6b8a6fSTom Lendacky 2751d6b8a6fSTom Lendacky int ccp_register_aes_xts_algs(struct list_head *head) 2761d6b8a6fSTom Lendacky { 2771d6b8a6fSTom Lendacky int i, ret; 2781d6b8a6fSTom Lendacky 2791d6b8a6fSTom Lendacky for (i = 0; i < ARRAY_SIZE(aes_xts_algs); i++) { 2801d6b8a6fSTom Lendacky ret = ccp_register_aes_xts_alg(head, &aes_xts_algs[i]); 2811d6b8a6fSTom Lendacky if (ret) 2821d6b8a6fSTom Lendacky return ret; 2831d6b8a6fSTom Lendacky } 2841d6b8a6fSTom Lendacky 2851d6b8a6fSTom Lendacky return 0; 2861d6b8a6fSTom Lendacky } 287