diff options
author | Daniele Alessandrelli <daniele.alessandrelli@intel.com> | 2020-12-16 11:46:37 +0000 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2021-01-03 08:41:36 +1100 |
commit | ae832e329a8d17144e5ae625e1704901f0e0b024 (patch) | |
tree | a29f22148e8fb1a9391bf0e6b3c72e700de41038 | |
parent | 472b04444cd39e16ba54987b2e901a79cf175463 (diff) |
crypto: keembay-ocs-hcu - Add HMAC support
Add HMAC support to the Keem Bay OCS HCU driver, thus making it provide
the following additional transformations:
- hmac(sha256)
- hmac(sha384)
- hmac(sha512)
- hmac(sm3)
The Keem Bay OCS HCU hardware does not allow "context-switch" for HMAC
operations, i.e., it does not support computing a partial HMAC, save its
state and then continue it later. Therefore, full hardware acceleration
is provided only when possible (e.g., when crypto_ahash_digest() is
called); in all other cases hardware acceleration is only partial (OPAD
and IPAD calculation is done in software, while hashing is hardware
accelerated).
Co-developed-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r-- | drivers/crypto/keembay/Kconfig | 2 | ||||
-rw-r--r-- | drivers/crypto/keembay/keembay-ocs-hcu-core.c | 387 | ||||
-rw-r--r-- | drivers/crypto/keembay/ocs-hcu.c | 156 | ||||
-rw-r--r-- | drivers/crypto/keembay/ocs-hcu.h | 8 |
4 files changed, 544 insertions, 9 deletions
diff --git a/drivers/crypto/keembay/Kconfig b/drivers/crypto/keembay/Kconfig index e99b5ddf4b94..e5f90cebe679 100644 --- a/drivers/crypto/keembay/Kconfig +++ b/drivers/crypto/keembay/Kconfig @@ -49,7 +49,7 @@ config CRYPTO_DEV_KEEMBAY_OCS_HCU Control Unit (HCU) hardware acceleration for use with Crypto API. Provides OCS HCU hardware acceleration of sha256, sha384, sha512, and - sm3. + sm3, as well as the HMAC variant of these algorithms. Say Y or M if you're building for the Intel Keem Bay SoC. If compiled as a module, the module will be called keembay-ocs-hcu. diff --git a/drivers/crypto/keembay/keembay-ocs-hcu-core.c b/drivers/crypto/keembay/keembay-ocs-hcu-core.c index 388cf9add757..37c4b4a689a8 100644 --- a/drivers/crypto/keembay/keembay-ocs-hcu-core.c +++ b/drivers/crypto/keembay/keembay-ocs-hcu-core.c @@ -16,6 +16,7 @@ #include <crypto/scatterwalk.h> #include <crypto/sha2.h> #include <crypto/sm3.h> +#include <crypto/hmac.h> #include <crypto/internal/hash.h> #include "ocs-hcu.h" @@ -24,17 +25,29 @@ /* Flag marking a final request. */ #define REQ_FINAL BIT(0) +/* Flag marking a HMAC request. */ +#define REQ_FLAGS_HMAC BIT(1) +/* Flag set when HW HMAC is being used. */ +#define REQ_FLAGS_HMAC_HW BIT(2) +/* Flag set when SW HMAC is being used. */ +#define REQ_FLAGS_HMAC_SW BIT(3) /** * struct ocs_hcu_ctx: OCS HCU Transform context. * @engine_ctx: Crypto Engine context. * @hcu_dev: The OCS HCU device used by the transformation. + * @key: The key (used only for HMAC transformations). + * @key_len: The length of the key. * @is_sm3_tfm: Whether or not this is an SM3 transformation. + * @is_hmac_tfm: Whether or not this is a HMAC transformation. */ struct ocs_hcu_ctx { struct crypto_engine_ctx engine_ctx; struct ocs_hcu_dev *hcu_dev; + u8 key[SHA512_BLOCK_SIZE]; + size_t key_len; bool is_sm3_tfm; + bool is_hmac_tfm; }; /** @@ -46,7 +59,8 @@ struct ocs_hcu_ctx { * @dig_sz: Digest size of the transformation / request. * @dma_list: OCS DMA linked list. * @hash_ctx: OCS HCU hashing context. - * @buffer: Buffer to store partial block of data. + * @buffer: Buffer to store: partial block of data and SW HMAC + * artifacts (ipad, opad, etc.). * @buf_cnt: Number of bytes currently stored in the buffer. * @buf_dma_addr: The DMA address of @buffer (when mapped). * @buf_dma_count: The number of bytes in @buffer currently DMA-mapped. @@ -63,7 +77,13 @@ struct ocs_hcu_rctx { size_t dig_sz; struct ocs_hcu_dma_list *dma_list; struct ocs_hcu_hash_ctx hash_ctx; - u8 buffer[SHA512_BLOCK_SIZE]; + /* + * Buffer is double the block size because we need space for SW HMAC + * artifacts, i.e: + * - ipad (1 block) + a possible partial block of data. + * - opad (1 block) + digest of H(k ^ ipad || m) + */ + u8 buffer[2 * SHA512_BLOCK_SIZE]; size_t buf_cnt; dma_addr_t buf_dma_addr; size_t buf_dma_count; @@ -352,19 +372,82 @@ static int kmb_ocs_hcu_handle_queue(struct ahash_request *req) return crypto_transfer_hash_request_to_engine(hcu_dev->engine, req); } +static int prepare_ipad(struct ahash_request *req) +{ + struct ocs_hcu_rctx *rctx = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ocs_hcu_ctx *ctx = crypto_ahash_ctx(tfm); + int i; + + WARN(rctx->buf_cnt, "%s: Context buffer is not empty\n", __func__); + WARN(!(rctx->flags & REQ_FLAGS_HMAC_SW), + "%s: HMAC_SW flag is not set\n", __func__); + /* + * Key length must be equal to block size. If key is shorter, + * we pad it with zero (note: key cannot be longer, since + * longer keys are hashed by kmb_ocs_hcu_setkey()). + */ + if (ctx->key_len > rctx->blk_sz) { + WARN("%s: Invalid key length in tfm context\n", __func__); + return -EINVAL; + } + memzero_explicit(&ctx->key[ctx->key_len], + rctx->blk_sz - ctx->key_len); + ctx->key_len = rctx->blk_sz; + /* + * Prepare IPAD for HMAC. Only done for first block. + * HMAC(k,m) = H(k ^ opad || H(k ^ ipad || m)) + * k ^ ipad will be first hashed block. + * k ^ opad will be calculated in the final request. + * Only needed if not using HW HMAC. + */ + for (i = 0; i < rctx->blk_sz; i++) + rctx->buffer[i] = ctx->key[i] ^ HMAC_IPAD_VALUE; + rctx->buf_cnt = rctx->blk_sz; + + return 0; +} + static int kmb_ocs_hcu_do_one_request(struct crypto_engine *engine, void *areq) { struct ahash_request *req = container_of(areq, struct ahash_request, base); struct ocs_hcu_dev *hcu_dev = kmb_ocs_hcu_find_dev(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct ocs_hcu_rctx *rctx = ahash_request_ctx(req); + struct ocs_hcu_ctx *tctx = crypto_ahash_ctx(tfm); int rc; + int i; if (!hcu_dev) { rc = -ENOENT; goto error; } + /* + * If hardware HMAC flag is set, perform HMAC in hardware. + * + * NOTE: this flag implies REQ_FINAL && kmb_get_total_data(rctx) + */ + if (rctx->flags & REQ_FLAGS_HMAC_HW) { + /* Map input data into the HCU DMA linked list. */ + rc = kmb_ocs_dma_prepare(req); + if (rc) + goto error; + + rc = ocs_hcu_hmac(hcu_dev, rctx->algo, tctx->key, tctx->key_len, + rctx->dma_list, req->result, rctx->dig_sz); + + /* Unmap data and free DMA list regardless of return code. */ + kmb_ocs_hcu_dma_cleanup(req, rctx); + + /* Process previous return code. */ + if (rc) + goto error; + + goto done; + } + /* Handle update request case. */ if (!(rctx->flags & REQ_FINAL)) { /* Update should always have input data. */ @@ -433,6 +516,36 @@ static int kmb_ocs_hcu_do_one_request(struct crypto_engine *engine, void *areq) goto error; } + /* + * If we are finalizing a SW HMAC request, we just computed the result + * of: H(k ^ ipad || m). + * + * We now need to complete the HMAC calculation with the OPAD step, + * that is, we need to compute H(k ^ opad || digest), where digest is + * the digest we just obtained, i.e., H(k ^ ipad || m). + */ + if (rctx->flags & REQ_FLAGS_HMAC_SW) { + /* + * Compute k ^ opad and store it in the request buffer (which + * is not used anymore at this point). + * Note: key has been padded / hashed already (so keylen == + * blksz) . + */ + WARN_ON(tctx->key_len != rctx->blk_sz); + for (i = 0; i < rctx->blk_sz; i++) + rctx->buffer[i] = tctx->key[i] ^ HMAC_OPAD_VALUE; + /* Now append the digest to the rest of the buffer. */ + for (i = 0; (i < rctx->dig_sz); i++) + rctx->buffer[rctx->blk_sz + i] = req->result[i]; + + /* Now hash the buffer to obtain the final HMAC. */ + rc = ocs_hcu_digest(hcu_dev, rctx->algo, rctx->buffer, + rctx->blk_sz + rctx->dig_sz, req->result, + rctx->dig_sz); + if (rc) + goto error; + } + /* Perform secure clean-up. */ kmb_ocs_hcu_secure_cleanup(req); done: @@ -486,12 +599,17 @@ static int kmb_ocs_hcu_init(struct ahash_request *req) /* Initialize intermediate data. */ ocs_hcu_hash_init(&rctx->hash_ctx, rctx->algo); + /* If this a HMAC request, set HMAC flag. */ + if (ctx->is_hmac_tfm) + rctx->flags |= REQ_FLAGS_HMAC; + return 0; } static int kmb_ocs_hcu_update(struct ahash_request *req) { struct ocs_hcu_rctx *rctx = ahash_request_ctx(req); + int rc; if (!req->nbytes) return 0; @@ -501,6 +619,19 @@ static int kmb_ocs_hcu_update(struct ahash_request *req) rctx->sg = req->src; /* + * If we are doing HMAC, then we must use SW-assisted HMAC, since HW + * HMAC does not support context switching (there it can only be used + * with finup() or digest()). + */ + if (rctx->flags & REQ_FLAGS_HMAC && + !(rctx->flags & REQ_FLAGS_HMAC_SW)) { + rctx->flags |= REQ_FLAGS_HMAC_SW; + rc = prepare_ipad(req); + if (rc) + return rc; + } + + /* * If remaining sg_data fits into ctx buffer, just copy it there; we'll * process it at the next update() or final(). */ @@ -510,6 +641,44 @@ static int kmb_ocs_hcu_update(struct ahash_request *req) return kmb_ocs_hcu_handle_queue(req); } +/* Common logic for kmb_ocs_hcu_final() and kmb_ocs_hcu_finup(). */ +static int kmb_ocs_hcu_fin_common(struct ahash_request *req) +{ + struct ocs_hcu_rctx *rctx = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ocs_hcu_ctx *ctx = crypto_ahash_ctx(tfm); + int rc; + + rctx->flags |= REQ_FINAL; + + /* + * If this is a HMAC request and, so far, we didn't have to switch to + * SW HMAC, check if we can use HW HMAC. + */ + if (rctx->flags & REQ_FLAGS_HMAC && + !(rctx->flags & REQ_FLAGS_HMAC_SW)) { + /* + * If we are here, it means we never processed any data so far, + * so we can use HW HMAC, but only if there is some data to + * process (since OCS HW MAC does not support zero-length + * messages) and the key length is supported by the hardware + * (OCS HCU HW only supports length <= 64); if HW HMAC cannot + * be used, fall back to SW-assisted HMAC. + */ + if (kmb_get_total_data(rctx) && + ctx->key_len <= OCS_HCU_HW_KEY_LEN) { + rctx->flags |= REQ_FLAGS_HMAC_HW; + } else { + rctx->flags |= REQ_FLAGS_HMAC_SW; + rc = prepare_ipad(req); + if (rc) + return rc; + } + } + + return kmb_ocs_hcu_handle_queue(req); +} + static int kmb_ocs_hcu_final(struct ahash_request *req) { struct ocs_hcu_rctx *rctx = ahash_request_ctx(req); @@ -518,9 +687,7 @@ static int kmb_ocs_hcu_final(struct ahash_request *req) rctx->sg_data_offset = 0; rctx->sg = NULL; - rctx->flags |= REQ_FINAL; - - return kmb_ocs_hcu_handle_queue(req); + return kmb_ocs_hcu_fin_common(req); } static int kmb_ocs_hcu_finup(struct ahash_request *req) @@ -531,9 +698,7 @@ static int kmb_ocs_hcu_finup(struct ahash_request *req) rctx->sg_data_offset = 0; rctx->sg = req->src; - rctx->flags |= REQ_FINAL; - - return kmb_ocs_hcu_handle_queue(req); + return kmb_ocs_hcu_fin_common(req); } static int kmb_ocs_hcu_digest(struct ahash_request *req) @@ -573,6 +738,76 @@ static int kmb_ocs_hcu_import(struct ahash_request *req, const void *in) return 0; } +static int kmb_ocs_hcu_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + unsigned int digestsize = crypto_ahash_digestsize(tfm); + struct ocs_hcu_ctx *ctx = crypto_ahash_ctx(tfm); + size_t blk_sz = crypto_ahash_blocksize(tfm); + struct crypto_ahash *ahash_tfm; + struct ahash_request *req; + struct crypto_wait wait; + struct scatterlist sg; + const char *alg_name; + int rc; + + /* + * Key length must be equal to block size: + * - If key is shorter, we are done for now (the key will be padded + * later on); this is to maximize the use of HW HMAC (which works + * only for keys <= 64 bytes). + * - If key is longer, we hash it. + */ + if (keylen <= blk_sz) { + memcpy(ctx->key, key, keylen); + ctx->key_len = keylen; + return 0; + } + + switch (digestsize) { + case SHA256_DIGEST_SIZE: + alg_name = ctx->is_sm3_tfm ? "sm3-keembay-ocs" : + "sha256-keembay-ocs"; + break; + case SHA384_DIGEST_SIZE: + alg_name = "sha384-keembay-ocs"; + break; + case SHA512_DIGEST_SIZE: + alg_name = "sha512-keembay-ocs"; + break; + default: + return -EINVAL; + } + + ahash_tfm = crypto_alloc_ahash(alg_name, 0, 0); + if (IS_ERR(ahash_tfm)) + return PTR_ERR(ahash_tfm); + + req = ahash_request_alloc(ahash_tfm, GFP_KERNEL); + if (!req) { + rc = -ENOMEM; + goto err_free_ahash; + } + + crypto_init_wait(&wait); + ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, + crypto_req_done, &wait); + crypto_ahash_clear_flags(ahash_tfm, ~0); + + sg_init_one(&sg, key, keylen); + ahash_request_set_crypt(req, &sg, ctx->key, keylen); + + rc = crypto_wait_req(crypto_ahash_digest(req), &wait); + if (rc == 0) + ctx->key_len = digestsize; + + ahash_request_free(req); +err_free_ahash: + crypto_free_ahash(ahash_tfm); + + return rc; +} + /* Set request size and initialize tfm context. */ static void __cra_init(struct crypto_tfm *tfm, struct ocs_hcu_ctx *ctx) { @@ -605,6 +840,38 @@ static int kmb_ocs_hcu_sm3_cra_init(struct crypto_tfm *tfm) return 0; } +static int kmb_ocs_hcu_hmac_sm3_cra_init(struct crypto_tfm *tfm) +{ + struct ocs_hcu_ctx *ctx = crypto_tfm_ctx(tfm); + + __cra_init(tfm, ctx); + + ctx->is_sm3_tfm = true; + ctx->is_hmac_tfm = true; + + return 0; +} + +static int kmb_ocs_hcu_hmac_cra_init(struct crypto_tfm *tfm) +{ + struct ocs_hcu_ctx *ctx = crypto_tfm_ctx(tfm); + + __cra_init(tfm, ctx); + + ctx->is_hmac_tfm = true; + + return 0; +} + +/* Function called when 'tfm' is de-initialized. */ +static void kmb_ocs_hcu_hmac_cra_exit(struct crypto_tfm *tfm) +{ + struct ocs_hcu_ctx *ctx = crypto_tfm_ctx(tfm); + + /* Clear the key. */ + memzero_explicit(ctx->key, sizeof(ctx->key)); +} + static struct ahash_alg ocs_hcu_algs[] = { { .init = kmb_ocs_hcu_init, @@ -638,6 +905,32 @@ static struct ahash_alg ocs_hcu_algs[] = { .digest = kmb_ocs_hcu_digest, .export = kmb_ocs_hcu_export, .import = kmb_ocs_hcu_import, + .setkey = kmb_ocs_hcu_setkey, + .halg = { + .digestsize = SHA256_DIGEST_SIZE, + .statesize = sizeof(struct ocs_hcu_rctx), + .base = { + .cra_name = "hmac(sha256)", + .cra_driver_name = "hmac-sha256-keembay-ocs", + .cra_priority = 255, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = SHA256_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ocs_hcu_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + .cra_init = kmb_ocs_hcu_hmac_cra_init, + .cra_exit = kmb_ocs_hcu_hmac_cra_exit, + } + } +}, +{ + .init = kmb_ocs_hcu_init, + .update = kmb_ocs_hcu_update, + .final = kmb_ocs_hcu_final, + .finup = kmb_ocs_hcu_finup, + .digest = kmb_ocs_hcu_digest, + .export = kmb_ocs_hcu_export, + .import = kmb_ocs_hcu_import, .halg = { .digestsize = SM3_DIGEST_SIZE, .statesize = sizeof(struct ocs_hcu_rctx), @@ -662,6 +955,32 @@ static struct ahash_alg ocs_hcu_algs[] = { .digest = kmb_ocs_hcu_digest, .export = kmb_ocs_hcu_export, .import = kmb_ocs_hcu_import, + .setkey = kmb_ocs_hcu_setkey, + .halg = { + .digestsize = SM3_DIGEST_SIZE, + .statesize = sizeof(struct ocs_hcu_rctx), + .base = { + .cra_name = "hmac(sm3)", + .cra_driver_name = "hmac-sm3-keembay-ocs", + .cra_priority = 255, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = SM3_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ocs_hcu_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + .cra_init = kmb_ocs_hcu_hmac_sm3_cra_init, + .cra_exit = kmb_ocs_hcu_hmac_cra_exit, + } + } +}, +{ + .init = kmb_ocs_hcu_init, + .update = kmb_ocs_hcu_update, + .final = kmb_ocs_hcu_final, + .finup = kmb_ocs_hcu_finup, + .digest = kmb_ocs_hcu_digest, + .export = kmb_ocs_hcu_export, + .import = kmb_ocs_hcu_import, .halg = { .digestsize = SHA384_DIGEST_SIZE, .statesize = sizeof(struct ocs_hcu_rctx), @@ -686,6 +1005,32 @@ static struct ahash_alg ocs_hcu_algs[] = { .digest = kmb_ocs_hcu_digest, .export = kmb_ocs_hcu_export, .import = kmb_ocs_hcu_import, + .setkey = kmb_ocs_hcu_setkey, + .halg = { + .digestsize = SHA384_DIGEST_SIZE, + .statesize = sizeof(struct ocs_hcu_rctx), + .base = { + .cra_name = "hmac(sha384)", + .cra_driver_name = "hmac-sha384-keembay-ocs", + .cra_priority = 255, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = SHA384_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ocs_hcu_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + .cra_init = kmb_ocs_hcu_hmac_cra_init, + .cra_exit = kmb_ocs_hcu_hmac_cra_exit, + } + } +}, +{ + .init = kmb_ocs_hcu_init, + .update = kmb_ocs_hcu_update, + .final = kmb_ocs_hcu_final, + .finup = kmb_ocs_hcu_finup, + .digest = kmb_ocs_hcu_digest, + .export = kmb_ocs_hcu_export, + .import = kmb_ocs_hcu_import, .halg = { .digestsize = SHA512_DIGEST_SIZE, .statesize = sizeof(struct ocs_hcu_rctx), @@ -702,6 +1047,32 @@ static struct ahash_alg ocs_hcu_algs[] = { } } }, +{ + .init = kmb_ocs_hcu_init, + .update = kmb_ocs_hcu_update, + .final = kmb_ocs_hcu_final, + .finup = kmb_ocs_hcu_finup, + .digest = kmb_ocs_hcu_digest, + .export = kmb_ocs_hcu_export, + .import = kmb_ocs_hcu_import, + .setkey = kmb_ocs_hcu_setkey, + .halg = { + .digestsize = SHA512_DIGEST_SIZE, + .statesize = sizeof(struct ocs_hcu_rctx), + .base = { + .cra_name = "hmac(sha512)", + .cra_driver_name = "hmac-sha512-keembay-ocs", + .cra_priority = 255, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = SHA512_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ocs_hcu_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + .cra_init = kmb_ocs_hcu_hmac_cra_init, + .cra_exit = kmb_ocs_hcu_hmac_cra_exit, + } + } +}, }; /* Device tree driver match. */ diff --git a/drivers/crypto/keembay/ocs-hcu.c b/drivers/crypto/keembay/ocs-hcu.c index 6a80a31d0b00..81eecacf603a 100644 --- a/drivers/crypto/keembay/ocs-hcu.c +++ b/drivers/crypto/keembay/ocs-hcu.c @@ -368,6 +368,69 @@ static int ocs_hcu_hw_cfg(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo, } /** + * ocs_hcu_clear_key() - Clear key stored in OCS HMAC KEY registers. + * @hcu_dev: The OCS HCU device whose key registers should be cleared. + */ +static void ocs_hcu_clear_key(struct ocs_hcu_dev *hcu_dev) +{ + int reg_off; + + /* Clear OCS_HCU_KEY_[0..15] */ + for (reg_off = 0; reg_off < OCS_HCU_HW_KEY_LEN; reg_off += sizeof(u32)) + writel(0, hcu_dev->io_base + OCS_HCU_KEY_0 + reg_off); +} + +/** + * ocs_hcu_write_key() - Write key to OCS HMAC KEY registers. + * @hcu_dev: The OCS HCU device the key should be written to. + * @key: The key to be written. + * @len: The size of the key to write. It must be OCS_HCU_HW_KEY_LEN. + * + * Return: 0 on success, negative error code otherwise. + */ +static int ocs_hcu_write_key(struct ocs_hcu_dev *hcu_dev, const u8 *key, size_t len) +{ + u32 key_u32[OCS_HCU_HW_KEY_LEN_U32]; + int i; + + if (len > OCS_HCU_HW_KEY_LEN) + return -EINVAL; + + /* Copy key into temporary u32 array. */ + memcpy(key_u32, key, len); + + /* + * Hardware requires all the bytes of the HW Key vector to be + * written. So pad with zero until we reach OCS_HCU_HW_KEY_LEN. + */ + memzero_explicit((u8 *)key_u32 + len, OCS_HCU_HW_KEY_LEN - len); + + /* + * OCS hardware expects the MSB of the key to be written at the highest + * address of the HCU Key vector; in other word, the key must be + * written in reverse order. + * + * Therefore, we first enable byte swapping for the HCU key vector; + * so that bytes of 32-bit word written to OCS_HCU_KEY_[0..15] will be + * swapped: + * 3 <---> 0, 2 <---> 1. + */ + writel(HCU_BYTE_ORDER_SWAP, + hcu_dev->io_base + OCS_HCU_KEY_BYTE_ORDER_CFG); + /* + * And then we write the 32-bit words composing the key starting from + * the end of the key. + */ + for (i = 0; i < OCS_HCU_HW_KEY_LEN_U32; i++) + writel(key_u32[OCS_HCU_HW_KEY_LEN_U32 - 1 - i], + hcu_dev->io_base + OCS_HCU_KEY_0 + (sizeof(u32) * i)); + + memzero_explicit(key_u32, OCS_HCU_HW_KEY_LEN); + + return 0; +} + +/** * ocs_hcu_ll_dma_start() - Start OCS HCU hashing via DMA * @hcu_dev: The OCS HCU device to use. * @dma_list: The OCS DMA list mapping the data to hash. @@ -649,6 +712,99 @@ int ocs_hcu_hash_final(struct ocs_hcu_dev *hcu_dev, return ocs_hcu_get_digest(hcu_dev, ctx->algo, dgst, dgst_len); } +/** + * ocs_hcu_digest() - Compute hash digest. + * @hcu_dev: The OCS HCU device to use. + * @algo: The hash algorithm to use. + * @data: The input data to process. + * @data_len: The length of @data. + * @dgst: The buffer where to save the computed digest. + * @dgst_len: The length of @dgst. + * + * Return: 0 on success; negative error code otherwise. + */ +int ocs_hcu_digest(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo, + void *data, size_t data_len, u8 *dgst, size_t dgst_len) +{ + struct device *dev = hcu_dev->dev; + dma_addr_t dma_handle; + u32 reg; + int rc; + + /* Configure the hardware for the current request. */ + rc = ocs_hcu_hw_cfg(hcu_dev, algo, false); + if (rc) + return rc; + + dma_handle = dma_map_single(dev, data, data_len, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_handle)) + return -EIO; + + reg = HCU_DMA_SNOOP_MASK | HCU_DMA_EN; + + ocs_hcu_done_irq_en(hcu_dev); + + reinit_completion(&hcu_dev->irq_done); + + writel(dma_handle, hcu_dev->io_base + OCS_HCU_DMA_SRC_ADDR); + writel(data_len, hcu_dev->io_base + OCS_HCU_DMA_SRC_SIZE); + writel(OCS_HCU_START, hcu_dev->io_base + OCS_HCU_OPERATION); + writel(reg, hcu_dev->io_base + OCS_HCU_DMA_DMA_MODE); + + writel(OCS_HCU_TERMINATE, hcu_dev->io_base + OCS_HCU_OPERATION); + + rc = ocs_hcu_wait_and_disable_irq(hcu_dev); + if (rc) + return rc; + + dma_unmap_single(dev, dma_handle, data_len, DMA_TO_DEVICE); + + return ocs_hcu_get_digest(hcu_dev, algo, dgst, dgst_len); +} + +/** + * ocs_hcu_hmac() - Compute HMAC. + * @hcu_dev: The OCS HCU device to use. + * @algo: The hash algorithm to use with HMAC. + * @key: The key to use. + * @dma_list: The OCS DMA list mapping the input data to process. + * @key_len: The length of @key. + * @dgst: The buffer where to save the computed HMAC. + * @dgst_len: The length of @dgst. + * + * Return: 0 on success; negative error code otherwise. + */ +int ocs_hcu_hmac(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo, + const u8 *key, size_t key_len, + const struct ocs_hcu_dma_list *dma_list, + u8 *dgst, size_t dgst_len) +{ + int rc; + + /* Ensure 'key' is not NULL. */ + if (!key || key_len == 0) + return -EINVAL; + + /* Configure the hardware for the current request. */ + rc = ocs_hcu_hw_cfg(hcu_dev, algo, true); + if (rc) + return rc; + + rc = ocs_hcu_write_key(hcu_dev, key, key_len); + if (rc) + return rc; + + rc = ocs_hcu_ll_dma_start(hcu_dev, dma_list, true); + + /* Clear HW key before processing return code. */ + ocs_hcu_clear_key(hcu_dev); + + if (rc) + return rc; + + return ocs_hcu_get_digest(hcu_dev, algo, dgst, dgst_len); +} + irqreturn_t ocs_hcu_irq_handler(int irq, void *dev_id) { struct ocs_hcu_dev *hcu_dev = dev_id; diff --git a/drivers/crypto/keembay/ocs-hcu.h b/drivers/crypto/keembay/ocs-hcu.h index 6a467dcaf99c..fbbbb92a0592 100644 --- a/drivers/crypto/keembay/ocs-hcu.h +++ b/drivers/crypto/keembay/ocs-hcu.h @@ -95,4 +95,12 @@ int ocs_hcu_hash_final(struct ocs_hcu_dev *hcu_dev, const struct ocs_hcu_hash_ctx *ctx, u8 *dgst, size_t dgst_len); +int ocs_hcu_digest(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo, + void *data, size_t data_len, u8 *dgst, size_t dgst_len); + +int ocs_hcu_hmac(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo, + const u8 *key, size_t key_len, + const struct ocs_hcu_dma_list *dma_list, + u8 *dgst, size_t dgst_len); + #endif /* _CRYPTO_OCS_HCU_H */ |