| // 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(&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(&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 = kmalloc(ivsize, flags); |
| if (!req_ctx->iv) { |
| rc = -ENOMEM; |
| goto exit_process; |
| } |
| memcpy(req_ctx->iv, iv, ivsize); |
| |
| /*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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| { |
| .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, |
| }, |
| }; |
| |
| 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++) { |
| 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; |
| } |