11d6b8a6fSTom Lendacky /* 21d6b8a6fSTom Lendacky * AMD Cryptographic Coprocessor (CCP) AES XTS crypto API support 31d6b8a6fSTom Lendacky * 41d6b8a6fSTom Lendacky * Copyright (C) 2013 Advanced Micro Devices, Inc. 51d6b8a6fSTom Lendacky * 61d6b8a6fSTom Lendacky * Author: Tom Lendacky <thomas.lendacky@amd.com> 71d6b8a6fSTom Lendacky * 81d6b8a6fSTom Lendacky * This program is free software; you can redistribute it and/or modify 91d6b8a6fSTom Lendacky * it under the terms of the GNU General Public License version 2 as 101d6b8a6fSTom Lendacky * published by the Free Software Foundation. 111d6b8a6fSTom Lendacky */ 121d6b8a6fSTom Lendacky 131d6b8a6fSTom Lendacky #include <linux/module.h> 141d6b8a6fSTom Lendacky #include <linux/sched.h> 151d6b8a6fSTom Lendacky #include <linux/delay.h> 161d6b8a6fSTom Lendacky #include <linux/scatterlist.h> 171d6b8a6fSTom Lendacky #include <linux/crypto.h> 181d6b8a6fSTom Lendacky #include <crypto/algapi.h> 191d6b8a6fSTom Lendacky #include <crypto/aes.h> 201d6b8a6fSTom Lendacky #include <crypto/scatterwalk.h> 211d6b8a6fSTom Lendacky 221d6b8a6fSTom Lendacky #include "ccp-crypto.h" 231d6b8a6fSTom Lendacky 241d6b8a6fSTom Lendacky struct ccp_aes_xts_def { 251d6b8a6fSTom Lendacky const char *name; 261d6b8a6fSTom Lendacky const char *drv_name; 271d6b8a6fSTom Lendacky }; 281d6b8a6fSTom Lendacky 291d6b8a6fSTom Lendacky static struct ccp_aes_xts_def aes_xts_algs[] = { 301d6b8a6fSTom Lendacky { 311d6b8a6fSTom Lendacky .name = "xts(aes)", 321d6b8a6fSTom Lendacky .drv_name = "xts-aes-ccp", 331d6b8a6fSTom Lendacky }, 341d6b8a6fSTom Lendacky }; 351d6b8a6fSTom Lendacky 361d6b8a6fSTom Lendacky struct ccp_unit_size_map { 371d6b8a6fSTom Lendacky unsigned int size; 381d6b8a6fSTom Lendacky u32 value; 391d6b8a6fSTom Lendacky }; 401d6b8a6fSTom Lendacky 411d6b8a6fSTom Lendacky static struct ccp_unit_size_map unit_size_map[] = { 421d6b8a6fSTom Lendacky { 431d6b8a6fSTom Lendacky .size = 4096, 441d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_4096, 451d6b8a6fSTom Lendacky }, 461d6b8a6fSTom Lendacky { 471d6b8a6fSTom Lendacky .size = 2048, 481d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_2048, 491d6b8a6fSTom Lendacky }, 501d6b8a6fSTom Lendacky { 511d6b8a6fSTom Lendacky .size = 1024, 521d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_1024, 531d6b8a6fSTom Lendacky }, 541d6b8a6fSTom Lendacky { 551d6b8a6fSTom Lendacky .size = 512, 561d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_512, 571d6b8a6fSTom Lendacky }, 581d6b8a6fSTom Lendacky { 591d6b8a6fSTom Lendacky .size = 256, 601d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE__LAST, 611d6b8a6fSTom Lendacky }, 621d6b8a6fSTom Lendacky { 631d6b8a6fSTom Lendacky .size = 128, 641d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE__LAST, 651d6b8a6fSTom Lendacky }, 661d6b8a6fSTom Lendacky { 671d6b8a6fSTom Lendacky .size = 64, 681d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE__LAST, 691d6b8a6fSTom Lendacky }, 701d6b8a6fSTom Lendacky { 711d6b8a6fSTom Lendacky .size = 32, 721d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE__LAST, 731d6b8a6fSTom Lendacky }, 741d6b8a6fSTom Lendacky { 751d6b8a6fSTom Lendacky .size = 16, 761d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE_16, 771d6b8a6fSTom Lendacky }, 781d6b8a6fSTom Lendacky { 791d6b8a6fSTom Lendacky .size = 1, 801d6b8a6fSTom Lendacky .value = CCP_XTS_AES_UNIT_SIZE__LAST, 811d6b8a6fSTom Lendacky }, 821d6b8a6fSTom Lendacky }; 831d6b8a6fSTom Lendacky 841d6b8a6fSTom Lendacky static int ccp_aes_xts_complete(struct crypto_async_request *async_req, int ret) 851d6b8a6fSTom Lendacky { 861d6b8a6fSTom Lendacky struct ablkcipher_request *req = ablkcipher_request_cast(async_req); 871d6b8a6fSTom Lendacky struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req); 881d6b8a6fSTom Lendacky 891d6b8a6fSTom Lendacky if (ret) 901d6b8a6fSTom Lendacky return ret; 911d6b8a6fSTom Lendacky 921d6b8a6fSTom Lendacky memcpy(req->info, rctx->iv, AES_BLOCK_SIZE); 931d6b8a6fSTom Lendacky 941d6b8a6fSTom Lendacky return 0; 951d6b8a6fSTom Lendacky } 961d6b8a6fSTom Lendacky 971d6b8a6fSTom Lendacky static int ccp_aes_xts_setkey(struct crypto_ablkcipher *tfm, const u8 *key, 981d6b8a6fSTom Lendacky unsigned int key_len) 991d6b8a6fSTom Lendacky { 1001d6b8a6fSTom Lendacky struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm)); 1011d6b8a6fSTom Lendacky 1021d6b8a6fSTom Lendacky /* Only support 128-bit AES key with a 128-bit Tweak key, 1031d6b8a6fSTom Lendacky * otherwise use the fallback 1041d6b8a6fSTom Lendacky */ 1051d6b8a6fSTom Lendacky switch (key_len) { 1061d6b8a6fSTom Lendacky case AES_KEYSIZE_128 * 2: 1071d6b8a6fSTom Lendacky memcpy(ctx->u.aes.key, key, key_len); 1081d6b8a6fSTom Lendacky break; 1091d6b8a6fSTom Lendacky } 1101d6b8a6fSTom Lendacky ctx->u.aes.key_len = key_len / 2; 1111d6b8a6fSTom Lendacky sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); 1121d6b8a6fSTom Lendacky 1131d6b8a6fSTom Lendacky return crypto_ablkcipher_setkey(ctx->u.aes.tfm_ablkcipher, key, 1141d6b8a6fSTom Lendacky key_len); 1151d6b8a6fSTom Lendacky } 1161d6b8a6fSTom Lendacky 1171d6b8a6fSTom Lendacky static int ccp_aes_xts_crypt(struct ablkcipher_request *req, 1181d6b8a6fSTom Lendacky unsigned int encrypt) 1191d6b8a6fSTom Lendacky { 1201d6b8a6fSTom Lendacky struct crypto_tfm *tfm = 1211d6b8a6fSTom Lendacky crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req)); 1221d6b8a6fSTom Lendacky struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 1231d6b8a6fSTom Lendacky struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req); 1241d6b8a6fSTom Lendacky unsigned int unit; 125ab6a11a7STom Lendacky u32 unit_size; 1261d6b8a6fSTom Lendacky int ret; 1271d6b8a6fSTom Lendacky 128369f3dabSTom Lendacky if (!ctx->u.aes.key_len) 1291d6b8a6fSTom Lendacky return -EINVAL; 1301d6b8a6fSTom Lendacky 131369f3dabSTom Lendacky if (req->nbytes & (AES_BLOCK_SIZE - 1)) 1321d6b8a6fSTom Lendacky return -EINVAL; 1331d6b8a6fSTom Lendacky 134369f3dabSTom Lendacky if (!req->info) 1351d6b8a6fSTom Lendacky return -EINVAL; 1361d6b8a6fSTom Lendacky 137ab6a11a7STom Lendacky unit_size = CCP_XTS_AES_UNIT_SIZE__LAST; 138ab6a11a7STom Lendacky if (req->nbytes <= unit_size_map[0].size) { 139ab6a11a7STom Lendacky for (unit = 0; unit < ARRAY_SIZE(unit_size_map); unit++) { 140ab6a11a7STom Lendacky if (!(req->nbytes & (unit_size_map[unit].size - 1))) { 141ab6a11a7STom Lendacky unit_size = unit_size_map[unit].value; 1421d6b8a6fSTom Lendacky break; 143ab6a11a7STom Lendacky } 144ab6a11a7STom Lendacky } 145ab6a11a7STom Lendacky } 1461d6b8a6fSTom Lendacky 147ab6a11a7STom Lendacky if ((unit_size == CCP_XTS_AES_UNIT_SIZE__LAST) || 1481d6b8a6fSTom Lendacky (ctx->u.aes.key_len != AES_KEYSIZE_128)) { 1491d6b8a6fSTom Lendacky /* Use the fallback to process the request for any 1501d6b8a6fSTom Lendacky * unsupported unit sizes or key sizes 1511d6b8a6fSTom Lendacky */ 1521d6b8a6fSTom Lendacky ablkcipher_request_set_tfm(req, ctx->u.aes.tfm_ablkcipher); 1531d6b8a6fSTom Lendacky ret = (encrypt) ? crypto_ablkcipher_encrypt(req) : 1541d6b8a6fSTom Lendacky crypto_ablkcipher_decrypt(req); 1551d6b8a6fSTom Lendacky ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm)); 1561d6b8a6fSTom Lendacky 1571d6b8a6fSTom Lendacky return ret; 1581d6b8a6fSTom Lendacky } 1591d6b8a6fSTom Lendacky 1601d6b8a6fSTom Lendacky memcpy(rctx->iv, req->info, AES_BLOCK_SIZE); 1611d6b8a6fSTom Lendacky sg_init_one(&rctx->iv_sg, rctx->iv, AES_BLOCK_SIZE); 1621d6b8a6fSTom Lendacky 1631d6b8a6fSTom Lendacky memset(&rctx->cmd, 0, sizeof(rctx->cmd)); 1641d6b8a6fSTom Lendacky INIT_LIST_HEAD(&rctx->cmd.entry); 1651d6b8a6fSTom Lendacky rctx->cmd.engine = CCP_ENGINE_XTS_AES_128; 1661d6b8a6fSTom Lendacky rctx->cmd.u.xts.action = (encrypt) ? CCP_AES_ACTION_ENCRYPT 1671d6b8a6fSTom Lendacky : CCP_AES_ACTION_DECRYPT; 168ab6a11a7STom Lendacky rctx->cmd.u.xts.unit_size = unit_size; 1691d6b8a6fSTom Lendacky rctx->cmd.u.xts.key = &ctx->u.aes.key_sg; 1701d6b8a6fSTom Lendacky rctx->cmd.u.xts.key_len = ctx->u.aes.key_len; 1711d6b8a6fSTom Lendacky rctx->cmd.u.xts.iv = &rctx->iv_sg; 1721d6b8a6fSTom Lendacky rctx->cmd.u.xts.iv_len = AES_BLOCK_SIZE; 1731d6b8a6fSTom Lendacky rctx->cmd.u.xts.src = req->src; 1741d6b8a6fSTom Lendacky rctx->cmd.u.xts.src_len = req->nbytes; 1751d6b8a6fSTom Lendacky rctx->cmd.u.xts.dst = req->dst; 1761d6b8a6fSTom Lendacky 1771d6b8a6fSTom Lendacky ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); 1781d6b8a6fSTom Lendacky 1791d6b8a6fSTom Lendacky return ret; 1801d6b8a6fSTom Lendacky } 1811d6b8a6fSTom Lendacky 1821d6b8a6fSTom Lendacky static int ccp_aes_xts_encrypt(struct ablkcipher_request *req) 1831d6b8a6fSTom Lendacky { 1841d6b8a6fSTom Lendacky return ccp_aes_xts_crypt(req, 1); 1851d6b8a6fSTom Lendacky } 1861d6b8a6fSTom Lendacky 1871d6b8a6fSTom Lendacky static int ccp_aes_xts_decrypt(struct ablkcipher_request *req) 1881d6b8a6fSTom Lendacky { 1891d6b8a6fSTom Lendacky return ccp_aes_xts_crypt(req, 0); 1901d6b8a6fSTom Lendacky } 1911d6b8a6fSTom Lendacky 1921d6b8a6fSTom Lendacky static int ccp_aes_xts_cra_init(struct crypto_tfm *tfm) 1931d6b8a6fSTom Lendacky { 1941d6b8a6fSTom Lendacky struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); 1951d6b8a6fSTom Lendacky struct crypto_ablkcipher *fallback_tfm; 1961d6b8a6fSTom Lendacky 1971d6b8a6fSTom Lendacky ctx->complete = ccp_aes_xts_complete; 1981d6b8a6fSTom Lendacky ctx->u.aes.key_len = 0; 1991d6b8a6fSTom Lendacky 200b4168a19SMarek Vasut fallback_tfm = crypto_alloc_ablkcipher(crypto_tfm_alg_name(tfm), 0, 2011d6b8a6fSTom Lendacky CRYPTO_ALG_ASYNC | 2021d6b8a6fSTom Lendacky CRYPTO_ALG_NEED_FALLBACK); 2031d6b8a6fSTom Lendacky if (IS_ERR(fallback_tfm)) { 2041d6b8a6fSTom Lendacky pr_warn("could not load fallback driver %s\n", 205b4168a19SMarek Vasut crypto_tfm_alg_name(tfm)); 2061d6b8a6fSTom Lendacky return PTR_ERR(fallback_tfm); 2071d6b8a6fSTom Lendacky } 2081d6b8a6fSTom Lendacky ctx->u.aes.tfm_ablkcipher = fallback_tfm; 2091d6b8a6fSTom Lendacky 2101d6b8a6fSTom Lendacky tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx) + 2111d6b8a6fSTom Lendacky fallback_tfm->base.crt_ablkcipher.reqsize; 2121d6b8a6fSTom Lendacky 2131d6b8a6fSTom Lendacky return 0; 2141d6b8a6fSTom Lendacky } 2151d6b8a6fSTom Lendacky 2161d6b8a6fSTom Lendacky static void ccp_aes_xts_cra_exit(struct crypto_tfm *tfm) 2171d6b8a6fSTom Lendacky { 2181d6b8a6fSTom Lendacky struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); 2191d6b8a6fSTom Lendacky 2201d6b8a6fSTom Lendacky if (ctx->u.aes.tfm_ablkcipher) 2211d6b8a6fSTom Lendacky crypto_free_ablkcipher(ctx->u.aes.tfm_ablkcipher); 2221d6b8a6fSTom Lendacky ctx->u.aes.tfm_ablkcipher = NULL; 2231d6b8a6fSTom Lendacky } 2241d6b8a6fSTom Lendacky 2251d6b8a6fSTom Lendacky static int ccp_register_aes_xts_alg(struct list_head *head, 2261d6b8a6fSTom Lendacky const struct ccp_aes_xts_def *def) 2271d6b8a6fSTom Lendacky { 2281d6b8a6fSTom Lendacky struct ccp_crypto_ablkcipher_alg *ccp_alg; 2291d6b8a6fSTom Lendacky struct crypto_alg *alg; 2301d6b8a6fSTom Lendacky int ret; 2311d6b8a6fSTom Lendacky 2321d6b8a6fSTom Lendacky ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); 2331d6b8a6fSTom Lendacky if (!ccp_alg) 2341d6b8a6fSTom Lendacky return -ENOMEM; 2351d6b8a6fSTom Lendacky 2361d6b8a6fSTom Lendacky INIT_LIST_HEAD(&ccp_alg->entry); 2371d6b8a6fSTom Lendacky 2381d6b8a6fSTom Lendacky alg = &ccp_alg->alg; 2391d6b8a6fSTom Lendacky 2401d6b8a6fSTom Lendacky snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 2411d6b8a6fSTom Lendacky snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 2421d6b8a6fSTom Lendacky def->drv_name); 2431d6b8a6fSTom Lendacky alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | 2441d6b8a6fSTom Lendacky CRYPTO_ALG_KERN_DRIVER_ONLY | 2451d6b8a6fSTom Lendacky CRYPTO_ALG_NEED_FALLBACK; 2461d6b8a6fSTom Lendacky alg->cra_blocksize = AES_BLOCK_SIZE; 2471d6b8a6fSTom Lendacky alg->cra_ctxsize = sizeof(struct ccp_ctx); 2481d6b8a6fSTom Lendacky alg->cra_priority = CCP_CRA_PRIORITY; 2491d6b8a6fSTom Lendacky alg->cra_type = &crypto_ablkcipher_type; 2501d6b8a6fSTom Lendacky alg->cra_ablkcipher.setkey = ccp_aes_xts_setkey; 2511d6b8a6fSTom Lendacky alg->cra_ablkcipher.encrypt = ccp_aes_xts_encrypt; 2521d6b8a6fSTom Lendacky alg->cra_ablkcipher.decrypt = ccp_aes_xts_decrypt; 2531d6b8a6fSTom Lendacky alg->cra_ablkcipher.min_keysize = AES_MIN_KEY_SIZE * 2; 2541d6b8a6fSTom Lendacky alg->cra_ablkcipher.max_keysize = AES_MAX_KEY_SIZE * 2; 2551d6b8a6fSTom Lendacky alg->cra_ablkcipher.ivsize = AES_BLOCK_SIZE; 2561d6b8a6fSTom Lendacky alg->cra_init = ccp_aes_xts_cra_init; 2571d6b8a6fSTom Lendacky alg->cra_exit = ccp_aes_xts_cra_exit; 2581d6b8a6fSTom Lendacky alg->cra_module = THIS_MODULE; 2591d6b8a6fSTom Lendacky 2601d6b8a6fSTom Lendacky ret = crypto_register_alg(alg); 2611d6b8a6fSTom Lendacky if (ret) { 2621d6b8a6fSTom Lendacky pr_err("%s ablkcipher algorithm registration error (%d)\n", 2631d6b8a6fSTom Lendacky alg->cra_name, ret); 2641d6b8a6fSTom Lendacky kfree(ccp_alg); 2651d6b8a6fSTom Lendacky return ret; 2661d6b8a6fSTom Lendacky } 2671d6b8a6fSTom Lendacky 2681d6b8a6fSTom Lendacky list_add(&ccp_alg->entry, head); 2691d6b8a6fSTom Lendacky 2701d6b8a6fSTom Lendacky return 0; 2711d6b8a6fSTom Lendacky } 2721d6b8a6fSTom Lendacky 2731d6b8a6fSTom Lendacky int ccp_register_aes_xts_algs(struct list_head *head) 2741d6b8a6fSTom Lendacky { 2751d6b8a6fSTom Lendacky int i, ret; 2761d6b8a6fSTom Lendacky 2771d6b8a6fSTom Lendacky for (i = 0; i < ARRAY_SIZE(aes_xts_algs); i++) { 2781d6b8a6fSTom Lendacky ret = ccp_register_aes_xts_alg(head, &aes_xts_algs[i]); 2791d6b8a6fSTom Lendacky if (ret) 2801d6b8a6fSTom Lendacky return ret; 2811d6b8a6fSTom Lendacky } 2821d6b8a6fSTom Lendacky 2831d6b8a6fSTom Lendacky return 0; 2841d6b8a6fSTom Lendacky } 285