diff options
Diffstat (limited to 'drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c')
| -rw-r--r-- | drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 468 |
1 files changed, 468 insertions, 0 deletions
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c new file mode 100644 index 000000000..8a94f812e --- /dev/null +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c @@ -0,0 +1,468 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * sun8i-ss-cipher.c - hardware cryptographic offloader for + * Allwinner A80/A83T SoC + * + * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com> + * + * This file add support for AES cipher with 128,192,256 bits keysize in + * CBC and ECB mode. + * + * You could find a link for the datasheet in Documentation/arm/sunxi.rst + */ + +#include <linux/bottom_half.h> +#include <linux/crypto.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/pm_runtime.h> +#include <crypto/scatterwalk.h> +#include <crypto/internal/skcipher.h> +#include "sun8i-ss.h" + +static bool sun8i_ss_need_fallback(struct skcipher_request *areq) +{ + struct scatterlist *in_sg = areq->src; + struct scatterlist *out_sg = areq->dst; + struct scatterlist *sg; + + if (areq->cryptlen == 0 || areq->cryptlen % 16) + return true; + + if (sg_nents(areq->src) > 8 || sg_nents(areq->dst) > 8) + return true; + + sg = areq->src; + while (sg) { + if ((sg->length % 16) != 0) + return true; + if ((sg_dma_len(sg) % 16) != 0) + return true; + if (!IS_ALIGNED(sg->offset, 16)) + return true; + sg = sg_next(sg); + } + sg = areq->dst; + while (sg) { + if ((sg->length % 16) != 0) + return true; + if ((sg_dma_len(sg) % 16) != 0) + return true; + if (!IS_ALIGNED(sg->offset, 16)) + return true; + sg = sg_next(sg); + } + + /* SS need same numbers of SG (with same length) for source and destination */ + in_sg = areq->src; + out_sg = areq->dst; + while (in_sg && out_sg) { + if (in_sg->length != out_sg->length) + return true; + in_sg = sg_next(in_sg); + out_sg = sg_next(out_sg); + } + if (in_sg || out_sg) + return true; + return false; +} + +static int sun8i_ss_cipher_fallback(struct skcipher_request *areq) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); + int err; + +#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG + struct skcipher_alg *alg = crypto_skcipher_alg(tfm); + struct sun8i_ss_alg_template *algt; + + algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher); + algt->stat_fb++; +#endif + skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm); + skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags, + areq->base.complete, areq->base.data); + skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst, + areq->cryptlen, areq->iv); + if (rctx->op_dir & SS_DECRYPTION) + err = crypto_skcipher_decrypt(&rctx->fallback_req); + else + err = crypto_skcipher_encrypt(&rctx->fallback_req); + return err; +} + +static int sun8i_ss_setup_ivs(struct skcipher_request *areq) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_ss_dev *ss = op->ss; + struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); + struct scatterlist *sg = areq->src; + unsigned int todo, offset; + unsigned int len = areq->cryptlen; + unsigned int ivsize = crypto_skcipher_ivsize(tfm); + struct sun8i_ss_flow *sf = &ss->flows[rctx->flow]; + int i = 0; + dma_addr_t a; + int err; + + rctx->ivlen = ivsize; + if (rctx->op_dir & SS_DECRYPTION) { + offset = areq->cryptlen - ivsize; + scatterwalk_map_and_copy(sf->biv, areq->src, offset, + ivsize, 0); + } + + /* we need to copy all IVs from source in case DMA is bi-directionnal */ + while (sg && len) { + if (sg_dma_len(sg) == 0) { + sg = sg_next(sg); + continue; + } + if (i == 0) + memcpy(sf->iv[0], areq->iv, ivsize); + a = dma_map_single(ss->dev, sf->iv[i], ivsize, DMA_TO_DEVICE); + if (dma_mapping_error(ss->dev, a)) { + memzero_explicit(sf->iv[i], ivsize); + dev_err(ss->dev, "Cannot DMA MAP IV\n"); + err = -EFAULT; + goto dma_iv_error; + } + rctx->p_iv[i] = a; + /* we need to setup all others IVs only in the decrypt way */ + if (rctx->op_dir == SS_ENCRYPTION) + return 0; + todo = min(len, sg_dma_len(sg)); + len -= todo; + i++; + if (i < MAX_SG) { + offset = sg->length - ivsize; + scatterwalk_map_and_copy(sf->iv[i], sg, offset, ivsize, 0); + } + rctx->niv = i; + sg = sg_next(sg); + } + + return 0; +dma_iv_error: + i--; + while (i >= 0) { + dma_unmap_single(ss->dev, rctx->p_iv[i], ivsize, DMA_TO_DEVICE); + memzero_explicit(sf->iv[i], ivsize); + i--; + } + return err; +} + +static int sun8i_ss_cipher(struct skcipher_request *areq) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_ss_dev *ss = op->ss; + struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); + struct skcipher_alg *alg = crypto_skcipher_alg(tfm); + struct sun8i_ss_alg_template *algt; + struct sun8i_ss_flow *sf = &ss->flows[rctx->flow]; + struct scatterlist *sg; + unsigned int todo, len, offset, ivsize; + int nr_sgs = 0; + int nr_sgd = 0; + int err = 0; + int i; + + algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher); + + dev_dbg(ss->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__, + crypto_tfm_alg_name(areq->base.tfm), + areq->cryptlen, + rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm), + op->keylen); + +#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG + algt->stat_req++; +#endif + + rctx->op_mode = ss->variant->op_mode[algt->ss_blockmode]; + rctx->method = ss->variant->alg_cipher[algt->ss_algo_id]; + rctx->keylen = op->keylen; + + rctx->p_key = dma_map_single(ss->dev, op->key, op->keylen, DMA_TO_DEVICE); + if (dma_mapping_error(ss->dev, rctx->p_key)) { + dev_err(ss->dev, "Cannot DMA MAP KEY\n"); + err = -EFAULT; + goto theend; + } + + ivsize = crypto_skcipher_ivsize(tfm); + if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) { + err = sun8i_ss_setup_ivs(areq); + if (err) + goto theend_key; + } + if (areq->src == areq->dst) { + nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src), + DMA_BIDIRECTIONAL); + if (nr_sgs <= 0 || nr_sgs > 8) { + dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs); + err = -EINVAL; + goto theend_iv; + } + nr_sgd = nr_sgs; + } else { + nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src), + DMA_TO_DEVICE); + if (nr_sgs <= 0 || nr_sgs > 8) { + dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs); + err = -EINVAL; + goto theend_iv; + } + nr_sgd = dma_map_sg(ss->dev, areq->dst, sg_nents(areq->dst), + DMA_FROM_DEVICE); + if (nr_sgd <= 0 || nr_sgd > 8) { + dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd); + err = -EINVAL; + goto theend_sgs; + } + } + + len = areq->cryptlen; + i = 0; + sg = areq->src; + while (i < nr_sgs && sg && len) { + if (sg_dma_len(sg) == 0) + goto sgs_next; + rctx->t_src[i].addr = sg_dma_address(sg); + todo = min(len, sg_dma_len(sg)); + rctx->t_src[i].len = todo / 4; + dev_dbg(ss->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__, + areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo); + len -= todo; + i++; +sgs_next: + sg = sg_next(sg); + } + if (len > 0) { + dev_err(ss->dev, "remaining len %d\n", len); + err = -EINVAL; + goto theend_sgs; + } + + len = areq->cryptlen; + i = 0; + sg = areq->dst; + while (i < nr_sgd && sg && len) { + if (sg_dma_len(sg) == 0) + goto sgd_next; + rctx->t_dst[i].addr = sg_dma_address(sg); + todo = min(len, sg_dma_len(sg)); + rctx->t_dst[i].len = todo / 4; + dev_dbg(ss->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__, + areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo); + len -= todo; + i++; +sgd_next: + sg = sg_next(sg); + } + if (len > 0) { + dev_err(ss->dev, "remaining len %d\n", len); + err = -EINVAL; + goto theend_sgs; + } + + err = sun8i_ss_run_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm)); + +theend_sgs: + if (areq->src == areq->dst) { + dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL); + } else { + dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_TO_DEVICE); + dma_unmap_sg(ss->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE); + } + +theend_iv: + if (areq->iv && ivsize > 0) { + for (i = 0; i < rctx->niv; i++) { + dma_unmap_single(ss->dev, rctx->p_iv[i], ivsize, DMA_TO_DEVICE); + memzero_explicit(sf->iv[i], ivsize); + } + + offset = areq->cryptlen - ivsize; + if (rctx->op_dir & SS_DECRYPTION) { + memcpy(areq->iv, sf->biv, ivsize); + memzero_explicit(sf->biv, ivsize); + } else { + scatterwalk_map_and_copy(areq->iv, areq->dst, offset, + ivsize, 0); + } + } + +theend_key: + dma_unmap_single(ss->dev, rctx->p_key, op->keylen, DMA_TO_DEVICE); + +theend: + + return err; +} + +static int sun8i_ss_handle_cipher_request(struct crypto_engine *engine, void *areq) +{ + int err; + struct skcipher_request *breq = container_of(areq, struct skcipher_request, base); + + err = sun8i_ss_cipher(breq); + local_bh_disable(); + crypto_finalize_skcipher_request(engine, breq, err); + local_bh_enable(); + + return 0; +} + +int sun8i_ss_skdecrypt(struct skcipher_request *areq) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); + struct crypto_engine *engine; + int e; + + memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx)); + rctx->op_dir = SS_DECRYPTION; + + if (sun8i_ss_need_fallback(areq)) + return sun8i_ss_cipher_fallback(areq); + + e = sun8i_ss_get_engine_number(op->ss); + engine = op->ss->flows[e].engine; + rctx->flow = e; + + return crypto_transfer_skcipher_request_to_engine(engine, areq); +} + +int sun8i_ss_skencrypt(struct skcipher_request *areq) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); + struct crypto_engine *engine; + int e; + + memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx)); + rctx->op_dir = SS_ENCRYPTION; + + if (sun8i_ss_need_fallback(areq)) + return sun8i_ss_cipher_fallback(areq); + + e = sun8i_ss_get_engine_number(op->ss); + engine = op->ss->flows[e].engine; + rctx->flow = e; + + return crypto_transfer_skcipher_request_to_engine(engine, areq); +} + +int sun8i_ss_cipher_init(struct crypto_tfm *tfm) +{ + struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); + struct sun8i_ss_alg_template *algt; + const char *name = crypto_tfm_alg_name(tfm); + struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm); + struct skcipher_alg *alg = crypto_skcipher_alg(sktfm); + int err; + + memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx)); + + algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher); + op->ss = algt->ss; + + op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); + if (IS_ERR(op->fallback_tfm)) { + dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n", + name, PTR_ERR(op->fallback_tfm)); + return PTR_ERR(op->fallback_tfm); + } + + sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) + + crypto_skcipher_reqsize(op->fallback_tfm); + + + dev_info(op->ss->dev, "Fallback for %s is %s\n", + crypto_tfm_alg_driver_name(&sktfm->base), + crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm))); + + op->enginectx.op.do_one_request = sun8i_ss_handle_cipher_request; + op->enginectx.op.prepare_request = NULL; + op->enginectx.op.unprepare_request = NULL; + + err = pm_runtime_resume_and_get(op->ss->dev); + if (err < 0) { + dev_err(op->ss->dev, "pm error %d\n", err); + goto error_pm; + } + + return 0; +error_pm: + crypto_free_skcipher(op->fallback_tfm); + return err; +} + +void sun8i_ss_cipher_exit(struct crypto_tfm *tfm) +{ + struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); + + kfree_sensitive(op->key); + crypto_free_skcipher(op->fallback_tfm); + pm_runtime_put_sync(op->ss->dev); +} + +int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_ss_dev *ss = op->ss; + + switch (keylen) { + case 128 / 8: + break; + case 192 / 8: + break; + case 256 / 8: + break; + default: + dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen); + return -EINVAL; + } + kfree_sensitive(op->key); + op->keylen = keylen; + op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); + if (!op->key) + return -ENOMEM; + + crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); + + return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); +} + +int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); + struct sun8i_ss_dev *ss = op->ss; + + if (unlikely(keylen != 3 * DES_KEY_SIZE)) { + dev_dbg(ss->dev, "Invalid keylen %u\n", keylen); + return -EINVAL; + } + + kfree_sensitive(op->key); + op->keylen = keylen; + op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); + if (!op->key) + return -ENOMEM; + + crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); + + return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); +} |