diff options
Diffstat (limited to 'drivers/crypto/ccree/cc_cipher.c')
| -rw-r--r-- | drivers/crypto/ccree/cc_cipher.c | 1150 |
1 files changed, 1150 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c new file mode 100644 index 000000000000..df98f7afe645 --- /dev/null +++ b/drivers/crypto/ccree/cc_cipher.c @@ -0,0 +1,1150 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <crypto/algapi.h> +#include <crypto/internal/skcipher.h> +#include <crypto/des.h> +#include <crypto/xts.h> +#include <crypto/scatterwalk.h> + +#include "cc_driver.h" +#include "cc_lli_defs.h" +#include "cc_buffer_mgr.h" +#include "cc_cipher.h" +#include "cc_request_mgr.h" + +#define MAX_ABLKCIPHER_SEQ_LEN 6 + +#define template_skcipher template_u.skcipher + +#define CC_MIN_AES_XTS_SIZE 0x10 +#define CC_MAX_AES_XTS_SIZE 0x2000 +struct cc_cipher_handle { + struct list_head alg_list; +}; + +struct cc_user_key_info { + u8 *key; + dma_addr_t key_dma_addr; +}; + +struct cc_hw_key_info { + enum cc_hw_crypto_key key1_slot; + enum cc_hw_crypto_key key2_slot; +}; + +struct cc_cipher_ctx { + struct cc_drvdata *drvdata; + int keylen; + int key_round_number; + int cipher_mode; + int flow_mode; + unsigned int flags; + struct cc_user_key_info user; + struct cc_hw_key_info hw; + struct crypto_shash *shash_tfm; +}; + +static void cc_cipher_complete(struct device *dev, void *cc_req, int err); + +static int validate_keys_sizes(struct cc_cipher_ctx *ctx_p, u32 size) +{ + switch (ctx_p->flow_mode) { + case S_DIN_to_AES: + switch (size) { + case CC_AES_128_BIT_KEY_SIZE: + case CC_AES_192_BIT_KEY_SIZE: + if (ctx_p->cipher_mode != DRV_CIPHER_XTS && + ctx_p->cipher_mode != DRV_CIPHER_ESSIV && + ctx_p->cipher_mode != DRV_CIPHER_BITLOCKER) + return 0; + break; + case CC_AES_256_BIT_KEY_SIZE: + return 0; + case (CC_AES_192_BIT_KEY_SIZE * 2): + case (CC_AES_256_BIT_KEY_SIZE * 2): + if (ctx_p->cipher_mode == DRV_CIPHER_XTS || + ctx_p->cipher_mode == DRV_CIPHER_ESSIV || + ctx_p->cipher_mode == DRV_CIPHER_BITLOCKER) + return 0; + break; + default: + break; + } + case S_DIN_to_DES: + if (size == DES3_EDE_KEY_SIZE || size == DES_KEY_SIZE) + return 0; + break; + default: + break; + } + return -EINVAL; +} + +static int validate_data_size(struct cc_cipher_ctx *ctx_p, + unsigned int size) +{ + switch (ctx_p->flow_mode) { + case S_DIN_to_AES: + switch (ctx_p->cipher_mode) { + case DRV_CIPHER_XTS: + if (size >= CC_MIN_AES_XTS_SIZE && + size <= CC_MAX_AES_XTS_SIZE && + IS_ALIGNED(size, AES_BLOCK_SIZE)) + return 0; + break; + case DRV_CIPHER_CBC_CTS: + if (size >= AES_BLOCK_SIZE) + return 0; + break; + case DRV_CIPHER_OFB: + case DRV_CIPHER_CTR: + return 0; + case DRV_CIPHER_ECB: + case DRV_CIPHER_CBC: + case DRV_CIPHER_ESSIV: + case DRV_CIPHER_BITLOCKER: + if (IS_ALIGNED(size, AES_BLOCK_SIZE)) + return 0; + break; + default: + break; + } + break; + case S_DIN_to_DES: + if (IS_ALIGNED(size, DES_BLOCK_SIZE)) + return 0; + break; + default: + break; + } + return -EINVAL; +} + +static int cc_cipher_init(struct crypto_tfm *tfm) +{ + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct cc_crypto_alg *cc_alg = + container_of(tfm->__crt_alg, struct cc_crypto_alg, + skcipher_alg.base); + struct device *dev = drvdata_to_dev(cc_alg->drvdata); + unsigned int max_key_buf_size = cc_alg->skcipher_alg.max_keysize; + int rc = 0; + + dev_dbg(dev, "Initializing context @%p for %s\n", ctx_p, + crypto_tfm_alg_name(tfm)); + + crypto_skcipher_set_reqsize(__crypto_skcipher_cast(tfm), + sizeof(struct cipher_req_ctx)); + + ctx_p->cipher_mode = cc_alg->cipher_mode; + ctx_p->flow_mode = cc_alg->flow_mode; + ctx_p->drvdata = cc_alg->drvdata; + + /* Allocate key buffer, cache line aligned */ + ctx_p->user.key = kmalloc(max_key_buf_size, GFP_KERNEL); + if (!ctx_p->user.key) + return -ENOMEM; + + dev_dbg(dev, "Allocated key buffer in context. key=@%p\n", + ctx_p->user.key); + + /* Map key buffer */ + ctx_p->user.key_dma_addr = dma_map_single(dev, (void *)ctx_p->user.key, + max_key_buf_size, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, ctx_p->user.key_dma_addr)) { + dev_err(dev, "Mapping Key %u B at va=%pK for DMA failed\n", + max_key_buf_size, ctx_p->user.key); + return -ENOMEM; + } + dev_dbg(dev, "Mapped key %u B at va=%pK to dma=%pad\n", + max_key_buf_size, ctx_p->user.key, &ctx_p->user.key_dma_addr); + + if (ctx_p->cipher_mode == DRV_CIPHER_ESSIV) { + /* Alloc hash tfm for essiv */ + ctx_p->shash_tfm = crypto_alloc_shash("sha256-generic", 0, 0); + if (IS_ERR(ctx_p->shash_tfm)) { + dev_err(dev, "Error allocating hash tfm for ESSIV.\n"); + return PTR_ERR(ctx_p->shash_tfm); + } + } + + return rc; +} + +static void cc_cipher_exit(struct crypto_tfm *tfm) +{ + struct crypto_alg *alg = tfm->__crt_alg; + struct cc_crypto_alg *cc_alg = + container_of(alg, struct cc_crypto_alg, + skcipher_alg.base); + unsigned int max_key_buf_size = cc_alg->skcipher_alg.max_keysize; + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct device *dev = drvdata_to_dev(ctx_p->drvdata); + + dev_dbg(dev, "Clearing context @%p for %s\n", + crypto_tfm_ctx(tfm), crypto_tfm_alg_name(tfm)); + + if (ctx_p->cipher_mode == DRV_CIPHER_ESSIV) { + /* Free hash tfm for essiv */ + crypto_free_shash(ctx_p->shash_tfm); + ctx_p->shash_tfm = NULL; + } + + /* Unmap key buffer */ + dma_unmap_single(dev, ctx_p->user.key_dma_addr, max_key_buf_size, + DMA_TO_DEVICE); + dev_dbg(dev, "Unmapped key buffer key_dma_addr=%pad\n", + &ctx_p->user.key_dma_addr); + + /* Free key buffer in context */ + kzfree(ctx_p->user.key); + dev_dbg(dev, "Free key buffer in context. key=@%p\n", ctx_p->user.key); +} + +struct tdes_keys { + u8 key1[DES_KEY_SIZE]; + u8 key2[DES_KEY_SIZE]; + u8 key3[DES_KEY_SIZE]; +}; + +static enum cc_hw_crypto_key hw_key_to_cc_hw_key(int slot_num) +{ + switch (slot_num) { + case 0: + return KFDE0_KEY; + case 1: + return KFDE1_KEY; + case 2: + return KFDE2_KEY; + case 3: + return KFDE3_KEY; + } + return END_OF_KEYS; +} + +static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key, + unsigned int keylen) +{ + struct crypto_tfm *tfm = crypto_skcipher_tfm(sktfm); + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct device *dev = drvdata_to_dev(ctx_p->drvdata); + u32 tmp[DES3_EDE_EXPKEY_WORDS]; + struct cc_crypto_alg *cc_alg = + container_of(tfm->__crt_alg, struct cc_crypto_alg, + skcipher_alg.base); + unsigned int max_key_buf_size = cc_alg->skcipher_alg.max_keysize; + + dev_dbg(dev, "Setting key in context @%p for %s. keylen=%u\n", + ctx_p, crypto_tfm_alg_name(tfm), keylen); + dump_byte_array("key", (u8 *)key, keylen); + + /* STAT_PHASE_0: Init and sanity checks */ + + if (validate_keys_sizes(ctx_p, keylen)) { + dev_err(dev, "Unsupported key size %d.\n", keylen); + crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + if (cc_is_hw_key(tfm)) { + /* setting HW key slots */ + struct arm_hw_key_info *hki = (struct arm_hw_key_info *)key; + + if (ctx_p->flow_mode != S_DIN_to_AES) { + dev_err(dev, "HW key not supported for non-AES flows\n"); + return -EINVAL; + } + + ctx_p->hw.key1_slot = hw_key_to_cc_hw_key(hki->hw_key1); + if (ctx_p->hw.key1_slot == END_OF_KEYS) { + dev_err(dev, "Unsupported hw key1 number (%d)\n", + hki->hw_key1); + return -EINVAL; + } + + if (ctx_p->cipher_mode == DRV_CIPHER_XTS || + ctx_p->cipher_mode == DRV_CIPHER_ESSIV || + ctx_p->cipher_mode == DRV_CIPHER_BITLOCKER) { + if (hki->hw_key1 == hki->hw_key2) { + dev_err(dev, "Illegal hw key numbers (%d,%d)\n", + hki->hw_key1, hki->hw_key2); + return -EINVAL; + } + ctx_p->hw.key2_slot = + hw_key_to_cc_hw_key(hki->hw_key2); + if (ctx_p->hw.key2_slot == END_OF_KEYS) { + dev_err(dev, "Unsupported hw key2 number (%d)\n", + hki->hw_key2); + return -EINVAL; + } + } + + ctx_p->keylen = keylen; + dev_dbg(dev, "cc_is_hw_key ret 0"); + + return 0; + } + + /* + * Verify DES weak keys + * Note that we're dropping the expanded key since the + * HW does the expansion on its own. + */ + if (ctx_p->flow_mode == S_DIN_to_DES) { + if (keylen == DES3_EDE_KEY_SIZE && + __des3_ede_setkey(tmp, &tfm->crt_flags, key, + DES3_EDE_KEY_SIZE)) { + dev_dbg(dev, "weak 3DES key"); + return -EINVAL; + } else if (!des_ekey(tmp, key) && + (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_WEAK_KEY)) { + tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY; + dev_dbg(dev, "weak DES key"); + return -EINVAL; + } + } + + if (ctx_p->cipher_mode == DRV_CIPHER_XTS && + xts_check_key(tfm, key, keylen)) { + dev_dbg(dev, "weak XTS key"); + return -EINVAL; + } + + /* STAT_PHASE_1: Copy key to ctx */ + dma_sync_single_for_cpu(dev, ctx_p->user.key_dma_addr, + max_key_buf_size, DMA_TO_DEVICE); + + memcpy(ctx_p->user.key, key, keylen); + if (keylen == 24) + memset(ctx_p->user.key + 24, 0, CC_AES_KEY_SIZE_MAX - 24); + + if (ctx_p->cipher_mode == DRV_CIPHER_ESSIV) { + /* sha256 for key2 - use sw implementation */ + int key_len = keylen >> 1; + int err; + + SHASH_DESC_ON_STACK(desc, ctx_p->shash_tfm); + + desc->tfm = ctx_p->shash_tfm; + + err = crypto_shash_digest(desc, ctx_p->user.key, key_len, + ctx_p->user.key + key_len); + if (err) { + dev_err(dev, "Failed to hash ESSIV key.\n"); + return err; + } + } + dma_sync_single_for_device(dev, ctx_p->user.key_dma_addr, + max_key_buf_size, DMA_TO_DEVICE); + ctx_p->keylen = keylen; + + dev_dbg(dev, "return safely"); + return 0; +} + +static void cc_setup_cipher_desc(struct crypto_tfm *tfm, + struct cipher_req_ctx *req_ctx, + unsigned int ivsize, unsigned int nbytes, + struct cc_hw_desc desc[], + unsigned int *seq_size) +{ + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct device *dev = drvdata_to_dev(ctx_p->drvdata); + int cipher_mode = ctx_p->cipher_mode; + int flow_mode = ctx_p->flow_mode; + int direction = req_ctx->gen_ctx.op_type; + dma_addr_t key_dma_addr = ctx_p->user.key_dma_addr; + unsigned int key_len = ctx_p->keylen; + dma_addr_t iv_dma_addr = req_ctx->gen_ctx.iv_dma_addr; + unsigned int du_size = nbytes; + + struct cc_crypto_alg *cc_alg = + container_of(tfm->__crt_alg, struct cc_crypto_alg, + skcipher_alg.base); + + if (cc_alg->data_unit) + du_size = cc_alg->data_unit; + + switch (cipher_mode) { + case DRV_CIPHER_CBC: + case DRV_CIPHER_CBC_CTS: + case DRV_CIPHER_CTR: + case DRV_CIPHER_OFB: + /* Load cipher state */ + hw_desc_init(&desc[*seq_size]); + set_din_type(&desc[*seq_size], DMA_DLLI, iv_dma_addr, ivsize, + NS_BIT); + set_cipher_config0(&desc[*seq_size], direction); + set_flow_mode(&desc[*seq_size], flow_mode); + set_cipher_mode(&desc[*seq_size], cipher_mode); + if (cipher_mode == DRV_CIPHER_CTR || + cipher_mode == DRV_CIPHER_OFB) { + set_setup_mode(&desc[*seq_size], SETUP_LOAD_STATE1); + } else { + set_setup_mode(&desc[*seq_size], SETUP_LOAD_STATE0); + } + (*seq_size)++; + /*FALLTHROUGH*/ + case DRV_CIPHER_ECB: + /* Load key */ + hw_desc_init(&desc[*seq_size]); + set_cipher_mode(&desc[*seq_size], cipher_mode); + set_cipher_config0(&desc[*seq_size], direction); + if (flow_mode == S_DIN_to_AES) { + if (cc_is_hw_key(tfm)) { + set_hw_crypto_key(&desc[*seq_size], + ctx_p->hw.key1_slot); + } else { + set_din_type(&desc[*seq_size], DMA_DLLI, + key_dma_addr, ((key_len == 24) ? + AES_MAX_KEY_SIZE : + key_len), NS_BIT); + } + set_key_size_aes(&desc[*seq_size], key_len); + } else { + /*des*/ + set_din_type(&desc[*seq_size], DMA_DLLI, key_dma_addr, + key_len, NS_BIT); + set_key_size_des(&desc[*seq_size], key_len); + } + set_flow_mode(&desc[*seq_size], flow_mode); + set_setup_mode(&desc[*seq_size], SETUP_LOAD_KEY0); + (*seq_size)++; + break; + case DRV_CIPHER_XTS: + case DRV_CIPHER_ESSIV: + case DRV_CIPHER_BITLOCKER: + /* Load AES key */ + hw_desc_init(&desc[*seq_size]); + set_cipher_mode(&desc[*seq_size], cipher_mode); + set_cipher_config0(&desc[*seq_size], direction); + if (cc_is_hw_key(tfm)) { + set_hw_crypto_key(&desc[*seq_size], + ctx_p->hw.key1_slot); + } else { + set_din_type(&desc[*seq_size], DMA_DLLI, key_dma_addr, + (key_len / 2), NS_BIT); + } + set_key_size_aes(&desc[*seq_size], (key_len / 2)); + set_flow_mode(&desc[*seq_size], flow_mode); + set_setup_mode(&desc[*seq_size], SETUP_LOAD_KEY0); + (*seq_size)++; + + /* load XEX key */ + hw_desc_init(&desc[*seq_size]); + set_cipher_mode(&desc[*seq_size], cipher_mode); + set_cipher_config0(&desc[*seq_size], direction); + if (cc_is_hw_key(tfm)) { + set_hw_crypto_key(&desc[*seq_size], + ctx_p->hw.key2_slot); + } else { + set_din_type(&desc[*seq_size], DMA_DLLI, + (key_dma_addr + (key_len / 2)), + (key_len / 2), NS_BIT); + } + set_xex_data_unit_size(&desc[*seq_size], du_size); + set_flow_mode(&desc[*seq_size], S_DIN_to_AES2); + set_key_size_aes(&desc[*seq_size], (key_len / 2)); + set_setup_mode(&desc[*seq_size], SETUP_LOAD_XEX_KEY); + (*seq_size)++; + + /* Set state */ + hw_desc_init(&desc[*seq_size]); + set_setup_mode(&desc[*seq_size], SETUP_LOAD_STATE1); + set_cipher_mode(&desc[*seq_size], cipher_mode); + set_cipher_config0(&desc[*seq_size], direction); + set_key_size_aes(&desc[*seq_size], (key_len / 2)); + set_flow_mode(&desc[*seq_size], flow_mode); + set_din_type(&desc[*seq_size], DMA_DLLI, iv_dma_addr, + CC_AES_BLOCK_SIZE, NS_BIT); + (*seq_size)++; + break; + default: + dev_err(dev, "Unsupported cipher mode (%d)\n", cipher_mode); + } +} + +static void cc_setup_cipher_data(struct crypto_tfm *tfm, + struct cipher_req_ctx *req_ctx, + struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes, + void *areq, struct cc_hw_desc desc[], + unsigned int *seq_size) +{ + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct device *dev = drvdata_to_dev(ctx_p->drvdata); + unsigned int flow_mode = ctx_p->flow_mode; + + switch (ctx_p->flow_mode) { + case S_DIN_to_AES: + flow_mode = DIN_AES_DOUT; + break; + case S_DIN_to_DES: + flow_mode = DIN_DES_DOUT; + break; + default: + dev_err(dev, "invalid flow mode, flow_mode = %d\n", flow_mode); + return; + } + /* Process */ + if (req_ctx->dma_buf_type == CC_DMA_BUF_DLLI) { + dev_dbg(dev, " data params addr %pad length 0x%X\n", + &sg_dma_address(src), nbytes); + dev_dbg(dev, " data params addr %pad length 0x%X\n", + &sg_dma_address(dst), nbytes); + hw_desc_init(&desc[*seq_size]); + set_din_type(&desc[*seq_size], DMA_DLLI, sg_dma_address(src), + nbytes, NS_BIT); + set_dout_dlli(&desc[*seq_size], sg_dma_address(dst), + nbytes, NS_BIT, (!areq ? 0 : 1)); + if (areq) + set_queue_last_ind(ctx_p->drvdata, &desc[*seq_size]); + + set_flow_mode(&desc[*seq_size], flow_mode); + (*seq_size)++; + } else { + /* bypass */ + dev_dbg(dev, " bypass params addr %pad length 0x%X addr 0x%08X\n", + &req_ctx->mlli_params.mlli_dma_addr, + req_ctx->mlli_params.mlli_len, + (unsigned int)ctx_p->drvdata->mlli_sram_addr); + hw_desc_init(&desc[*seq_size]); + set_din_type(&desc[*seq_size], DMA_DLLI, + req_ctx->mlli_params.mlli_dma_addr, + req_ctx->mlli_params.mlli_len, NS_BIT); + set_dout_sram(&desc[*seq_size], + ctx_p->drvdata->mlli_sram_addr, + req_ctx->mlli_params.mlli_len); + set_flow_mode(&desc[*seq_size], BYPASS); + (*seq_size)++; + + hw_desc_init(&desc[*seq_size]); + set_din_type(&desc[*seq_size], DMA_MLLI, + ctx_p->drvdata->mlli_sram_addr, + req_ctx->in_mlli_nents, NS_BIT); + if (req_ctx->out_nents == 0) { + dev_dbg(dev, " din/dout params addr 0x%08X addr 0x%08X\n", + (unsigned int)ctx_p->drvdata->mlli_sram_addr, + (unsigned int)ctx_p->drvdata->mlli_sram_addr); + set_dout_mlli(&desc[*seq_size], + ctx_p->drvdata->mlli_sram_addr, + req_ctx->in_mlli_nents, NS_BIT, + (!areq ? 0 : 1)); + } else { + dev_dbg(dev, " din/dout params addr 0x%08X addr 0x%08X\n", + (unsigned int)ctx_p->drvdata->mlli_sram_addr, + (unsigned int)ctx_p->drvdata->mlli_sram_addr + + (u32)LLI_ENTRY_BYTE_SIZE * req_ctx->in_nents); + set_dout_mlli(&desc[*seq_size], + (ctx_p->drvdata->mlli_sram_addr + + (LLI_ENTRY_BYTE_SIZE * + req_ctx->in_mlli_nents)), + req_ctx->out_mlli_nents, NS_BIT, + (!areq ? 0 : 1)); + } + if (areq) + set_queue_last_ind(ctx_p->drvdata, &desc[*seq_size]); + + set_flow_mode(&desc[*seq_size], flow_mode); + (*seq_size)++; + } +} + +static void cc_cipher_complete(struct device *dev, void *cc_req, int err) +{ + struct skcipher_request *req = (struct skcipher_request *)cc_req; + struct scatterlist *dst = req->dst; + struct scatterlist *src = req->src; + struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + unsigned int ivsize = crypto_skcipher_ivsize(tfm); + + cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst); + kzfree(req_ctx->iv); + + /* + * The crypto API expects us to set the req->iv to the last + * ciphertext block. For encrypt, simply copy from the result. + * For decrypt, we must copy from a saved buffer since this + * could be an in-place decryption operation and the src is + * lost by this point. + */ + if (req_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT) { + memcpy(req->iv, req_ctx->backup_info, ivsize); + kzfree(req_ctx->backup_info); + } else if (!err) { + scatterwalk_map_and_copy(req->iv, req->dst, + (req->cryptlen - ivsize), + ivsize, 0); + } + + skcipher_request_complete(req, err); +} + +static int cc_cipher_process(struct skcipher_request *req, + enum drv_crypto_direction direction) +{ + struct crypto_skcipher *sk_tfm = crypto_skcipher_reqtfm(req); + struct crypto_tfm *tfm = crypto_skcipher_tfm(sk_tfm); + struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req); + unsigned int ivsize = crypto_skcipher_ivsize(sk_tfm); + struct scatterlist *dst = req->dst; + struct scatterlist *src = req->src; + unsigned int nbytes = req->cryptlen; + void *iv = req->iv; + struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); + struct device *dev = drvdata_to_dev(ctx_p->drvdata); + struct cc_hw_desc desc[MAX_ABLKCIPHER_SEQ_LEN]; + struct cc_crypto_req cc_req = {}; + int rc, cts_restore_flag = 0; + unsigned int seq_len = 0; + gfp_t flags = cc_gfp_flags(&req->base); + + dev_dbg(dev, "%s req=%p iv=%p nbytes=%d\n", + ((direction == DRV_CRYPTO_DIRECTION_ENCRYPT) ? + "Encrypt" : "Decrypt"), req, iv, nbytes); + + /* STAT_PHASE_0: Init and sanity checks */ + + /* TODO: check data length according to mode */ + if (validate_data_size(ctx_p, nbytes)) { + dev_err(dev, "Unsupported data size %d.\n", nbytes); + crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_BLOCK_LEN); + rc = -EINVAL; + goto exit_process; + } + if (nbytes == 0) { + /* No data to process is valid */ + rc = 0; + goto exit_process; + } + + /* The IV we are handed may be allocted from the stack so + * we must copy it to a DMAable buffer before use. + */ + req_ctx->iv = kmemdup(iv, ivsize, flags); + if (!req_ctx->iv) { + rc = -ENOMEM; + goto exit_process; + } + + /*For CTS in case of data size aligned to 16 use CBC mode*/ + if (((nbytes % AES_BLOCK_SIZE) == 0) && + ctx_p->cipher_mode == DRV_CIPHER_CBC_CTS) { + ctx_p->cipher_mode = DRV_CIPHER_CBC; + cts_restore_flag = 1; + } + + /* Setup request structure */ + cc_req.user_cb = (void *)cc_cipher_complete; + cc_req.user_arg = (void *)req; + +#ifdef ENABLE_CYCLE_COUNT + cc_req.op_type = (direction == DRV_CRYPTO_DIRECTION_DECRYPT) ? + STAT_OP_TYPE_DECODE : STAT_OP_TYPE_ENCODE; + +#endif + + /* Setup request context */ + req_ctx->gen_ctx.op_type = direction; + + /* STAT_PHASE_1: Map buffers */ + + rc = cc_map_cipher_request(ctx_p->drvdata, req_ctx, ivsize, nbytes, + req_ctx->iv, src, dst, flags); + if (rc) { + dev_err(dev, "map_request() failed\n"); + goto exit_process; + } + + /* STAT_PHASE_2: Create sequence */ + + /* Setup processing */ + cc_setup_cipher_desc(tfm, req_ctx, ivsize, nbytes, desc, &seq_len); + /* Data processing */ + cc_setup_cipher_data(tfm, req_ctx, dst, src, nbytes, req, desc, + &seq_len); + + /* do we need to generate IV? */ + if (req_ctx->is_giv) { + cc_req.ivgen_dma_addr[0] = req_ctx->gen_ctx.iv_dma_addr; + cc_req.ivgen_dma_addr_len = 1; + /* set the IV size (8/16 B long)*/ + cc_req.ivgen_size = ivsize; + } + + /* STAT_PHASE_3: Lock HW and push sequence */ + + rc = cc_send_request(ctx_p->drvdata, &cc_req, desc, seq_len, + &req->base); + if (rc != -EINPROGRESS && rc != -EBUSY) { + /* Failed to send the request or request completed + * synchronously + */ + cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst); + } + +exit_process: + if (cts_restore_flag) + ctx_p->cipher_mode = DRV_CIPHER_CBC_CTS; + + if (rc != -EINPROGRESS && rc != -EBUSY) { + kzfree(req_ctx->backup_info); + kzfree(req_ctx->iv); + } + + return rc; +} + +static int cc_cipher_encrypt(struct skcipher_request *req) +{ + struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req); + + req_ctx->is_giv = false; + req_ctx->backup_info = NULL; + + return cc_cipher_process(req, DRV_CRYPTO_DIRECTION_ENCRYPT); +} + +static int cc_cipher_decrypt(struct skcipher_request *req) +{ + struct crypto_skcipher *sk_tfm = crypto_skcipher_reqtfm(req); + struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req); + unsigned int ivsize = crypto_skcipher_ivsize(sk_tfm); + gfp_t flags = cc_gfp_flags(&req->base); + + /* + * Allocate and save the last IV sized bytes of the source, which will + * be lost in case of in-place decryption and might be needed for CTS. + */ + req_ctx->backup_info = kmalloc(ivsize, flags); + if (!req_ctx->backup_info) + return -ENOMEM; + + scatterwalk_map_and_copy(req_ctx->backup_info, req->src, + (req->cryptlen - ivsize), ivsize, 0); + req_ctx->is_giv = false; + + return cc_cipher_process(req, DRV_CRYPTO_DIRECTION_DECRYPT); +} + +/* Block cipher alg */ +static const struct cc_alg_template skcipher_algs[] = { + { + .name = "xts(aes)", + .driver_name = "xts-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_XTS, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "xts512(aes)", + .driver_name = "xts-aes-du512-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_XTS, + .flow_mode = S_DIN_to_AES, + .data_unit = 512, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "xts4096(aes)", + .driver_name = "xts-aes-du4096-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_XTS, + .flow_mode = S_DIN_to_AES, + .data_unit = 4096, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "essiv(aes)", + .driver_name = "essiv-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_ESSIV, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "essiv512(aes)", + .driver_name = "essiv-aes-du512-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_ESSIV, + .flow_mode = S_DIN_to_AES, + .data_unit = 512, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "essiv4096(aes)", + .driver_name = "essiv-aes-du4096-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_ESSIV, + .flow_mode = S_DIN_to_AES, + .data_unit = 4096, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "bitlocker(aes)", + .driver_name = "bitlocker-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_BITLOCKER, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "bitlocker512(aes)", + .driver_name = "bitlocker-aes-du512-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_BITLOCKER, + .flow_mode = S_DIN_to_AES, + .data_unit = 512, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "bitlocker4096(aes)", + .driver_name = "bitlocker-aes-du4096-ccree", + .blocksize = AES_BLOCK_SIZE, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE * 2, + .max_keysize = AES_MAX_KEY_SIZE * 2, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_BITLOCKER, + .flow_mode = S_DIN_to_AES, + .data_unit = 4096, + .min_hw_rev = CC_HW_REV_712, + }, + { + .name = "ecb(aes)", + .driver_name = "ecb-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = 0, + }, + .cipher_mode = DRV_CIPHER_ECB, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "cbc(aes)", + .driver_name = "cbc-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_CBC, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "ofb(aes)", + .driver_name = "ofb-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_OFB, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "cts1(cbc(aes))", + .driver_name = "cts1-cbc-aes-ccree", + .blocksize = AES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_CBC_CTS, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "ctr(aes)", + .driver_name = "ctr-aes-ccree", + .blocksize = 1, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_CTR, + .flow_mode = S_DIN_to_AES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "cbc(des3_ede)", + .driver_name = "cbc-3des-ccree", + .blocksize = DES3_EDE_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = DES3_EDE_KEY_SIZE, + .max_keysize = DES3_EDE_KEY_SIZE, + .ivsize = DES3_EDE_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_CBC, + .flow_mode = S_DIN_to_DES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "ecb(des3_ede)", + .driver_name = "ecb-3des-ccree", + .blocksize = DES3_EDE_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = DES3_EDE_KEY_SIZE, + .max_keysize = DES3_EDE_KEY_SIZE, + .ivsize = 0, + }, + .cipher_mode = DRV_CIPHER_ECB, + .flow_mode = S_DIN_to_DES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "cbc(des)", + .driver_name = "cbc-des-ccree", + .blocksize = DES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + }, + .cipher_mode = DRV_CIPHER_CBC, + .flow_mode = S_DIN_to_DES, + .min_hw_rev = CC_HW_REV_630, + }, + { + .name = "ecb(des)", + .driver_name = "ecb-des-ccree", + .blocksize = DES_BLOCK_SIZE, + .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .template_skcipher = { + .setkey = cc_cipher_setkey, + .encrypt = cc_cipher_encrypt, + .decrypt = cc_cipher_decrypt, + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .ivsize = 0, + }, + .cipher_mode = DRV_CIPHER_ECB, + .flow_mode = S_DIN_to_DES, + .min_hw_rev = CC_HW_REV_630, + }, +}; + +static struct cc_crypto_alg *cc_create_alg(const struct cc_alg_template *tmpl, + struct device *dev) +{ + struct cc_crypto_alg *t_alg; + struct skcipher_alg *alg; + + t_alg = kzalloc(sizeof(*t_alg), GFP_KERNEL); + if (!t_alg) + return ERR_PTR(-ENOMEM); + + alg = &t_alg->skcipher_alg; + + memcpy(alg, &tmpl->template_skcipher, sizeof(*alg)); + + snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", tmpl->name); + snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", + tmpl->driver_name); + alg->base.cra_module = THIS_MODULE; + alg->base.cra_priority = CC_CRA_PRIO; + alg->base.cra_blocksize = tmpl->blocksize; + alg->base.cra_alignmask = 0; + alg->base.cra_ctxsize = sizeof(struct cc_cipher_ctx); + + alg->base.cra_init = cc_cipher_init; + alg->base.cra_exit = cc_cipher_exit; + alg->base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY | + CRYPTO_ALG_TYPE_SKCIPHER; + + t_alg->cipher_mode = tmpl->cipher_mode; + t_alg->flow_mode = tmpl->flow_mode; + t_alg->data_unit = tmpl->data_unit; + + return t_alg; +} + +int cc_cipher_free(struct cc_drvdata *drvdata) +{ + struct cc_crypto_alg *t_alg, *n; + struct cc_cipher_handle *cipher_handle = drvdata->cipher_handle; + + if (cipher_handle) { + /* Remove registered algs */ + list_for_each_entry_safe(t_alg, n, &cipher_handle->alg_list, + entry) { + crypto_unregister_skcipher(&t_alg->skcipher_alg); + list_del(&t_alg->entry); + kfree(t_alg); + } + kfree(cipher_handle); + drvdata->cipher_handle = NULL; + } + return 0; +} + +int cc_cipher_alloc(struct cc_drvdata *drvdata) +{ + struct cc_cipher_handle *cipher_handle; + struct cc_crypto_alg *t_alg; + struct device *dev = drvdata_to_dev(drvdata); + int rc = -ENOMEM; + int alg; + + cipher_handle = kmalloc(sizeof(*cipher_handle), GFP_KERNEL); + if (!cipher_handle) + return -ENOMEM; + + INIT_LIST_HEAD(&cipher_handle->alg_list); + drvdata->cipher_handle = cipher_handle; + + /* Linux crypto */ + dev_dbg(dev, "Number of algorithms = %zu\n", + ARRAY_SIZE(skcipher_algs)); + for (alg = 0; alg < ARRAY_SIZE(skcipher_algs); alg++) { + if (skcipher_algs[alg].min_hw_rev > drvdata->hw_rev) + continue; + + dev_dbg(dev, "creating %s\n", skcipher_algs[alg].driver_name); + t_alg = cc_create_alg(&skcipher_algs[alg], dev); + if (IS_ERR(t_alg)) { + rc = PTR_ERR(t_alg); + dev_err(dev, "%s alg allocation failed\n", + skcipher_algs[alg].driver_name); + goto fail0; + } + t_alg->drvdata = drvdata; + + dev_dbg(dev, "registering %s\n", + skcipher_algs[alg].driver_name); + rc = crypto_register_skcipher(&t_alg->skcipher_alg); + dev_dbg(dev, "%s alg registration rc = %x\n", + t_alg->skcipher_alg.base.cra_driver_name, rc); + if (rc) { + dev_err(dev, "%s alg registration failed\n", + t_alg->skcipher_alg.base.cra_driver_name); + kfree(t_alg); + goto fail0; + } else { + list_add_tail(&t_alg->entry, + &cipher_handle->alg_list); + dev_dbg(dev, "Registered %s\n", + t_alg->skcipher_alg.base.cra_driver_name); + } + } + return 0; + +fail0: + cc_cipher_free(drvdata); + return rc; +} |