diff options
Diffstat (limited to 'drivers/crypto/caam/caampkc.c')
| -rw-r--r-- | drivers/crypto/caam/caampkc.c | 1227 |
1 files changed, 1227 insertions, 0 deletions
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c new file mode 100644 index 0000000000..887a5f2fb9 --- /dev/null +++ b/drivers/crypto/caam/caampkc.c @@ -0,0 +1,1227 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) +/* + * caam - Freescale FSL CAAM support for Public Key Cryptography + * + * Copyright 2016 Freescale Semiconductor, Inc. + * Copyright 2018-2019, 2023 NXP + * + * There is no Shared Descriptor for PKC so that the Job Descriptor must carry + * all the desired key parameters, input and output pointers. + */ +#include "compat.h" +#include "regs.h" +#include "intern.h" +#include "jr.h" +#include "error.h" +#include "desc_constr.h" +#include "sg_sw_sec4.h" +#include "caampkc.h" +#include <crypto/internal/engine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/string.h> + +#define DESC_RSA_PUB_LEN (2 * CAAM_CMD_SZ + SIZEOF_RSA_PUB_PDB) +#define DESC_RSA_PRIV_F1_LEN (2 * CAAM_CMD_SZ + \ + SIZEOF_RSA_PRIV_F1_PDB) +#define DESC_RSA_PRIV_F2_LEN (2 * CAAM_CMD_SZ + \ + SIZEOF_RSA_PRIV_F2_PDB) +#define DESC_RSA_PRIV_F3_LEN (2 * CAAM_CMD_SZ + \ + SIZEOF_RSA_PRIV_F3_PDB) +#define CAAM_RSA_MAX_INPUT_SIZE 512 /* for a 4096-bit modulus */ + +/* buffer filled with zeros, used for padding */ +static u8 *zero_buffer; + +/* + * variable used to avoid double free of resources in case + * algorithm registration was unsuccessful + */ +static bool init_done; + +struct caam_akcipher_alg { + struct akcipher_engine_alg akcipher; + bool registered; +}; + +static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + + dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE); + dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE); + + if (edesc->sec4_sg_bytes) + dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes, + DMA_TO_DEVICE); +} + +static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct rsa_pub_pdb *pdb = &edesc->pdb.pub; + + dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE); +} + +static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1; + + dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); +} + +static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2; + size_t p_sz = key->p_sz; + size_t q_sz = key->q_sz; + + dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); + dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL); +} + +static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3; + size_t p_sz = key->p_sz; + size_t q_sz = key->q_sz; + + dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); + dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL); +} + +/* RSA Job Completion handler */ +static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context) +{ + struct akcipher_request *req = context; + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); + struct rsa_edesc *edesc; + int ecode = 0; + bool has_bklog; + + if (err) + ecode = caam_jr_strstatus(dev, err); + + edesc = req_ctx->edesc; + has_bklog = edesc->bklog; + + rsa_pub_unmap(dev, edesc, req); + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + /* + * If no backlog flag, the completion of the request is done + * by CAAM, not crypto engine. + */ + if (!has_bklog) + akcipher_request_complete(req, ecode); + else + crypto_finalize_akcipher_request(jrp->engine, req, ecode); +} + +static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err, + void *context) +{ + struct akcipher_request *req = context; + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct rsa_edesc *edesc; + int ecode = 0; + bool has_bklog; + + if (err) + ecode = caam_jr_strstatus(dev, err); + + edesc = req_ctx->edesc; + has_bklog = edesc->bklog; + + switch (key->priv_form) { + case FORM1: + rsa_priv_f1_unmap(dev, edesc, req); + break; + case FORM2: + rsa_priv_f2_unmap(dev, edesc, req); + break; + case FORM3: + rsa_priv_f3_unmap(dev, edesc, req); + } + + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + /* + * If no backlog flag, the completion of the request is done + * by CAAM, not crypto engine. + */ + if (!has_bklog) + akcipher_request_complete(req, ecode); + else + crypto_finalize_akcipher_request(jrp->engine, req, ecode); +} + +/** + * caam_rsa_count_leading_zeros - Count leading zeros, need it to strip, + * from a given scatterlist + * + * @sgl : scatterlist to count zeros from + * @nbytes: number of zeros, in bytes, to strip + * @flags : operation flags + */ +static int caam_rsa_count_leading_zeros(struct scatterlist *sgl, + unsigned int nbytes, + unsigned int flags) +{ + struct sg_mapping_iter miter; + int lzeros, ents; + unsigned int len; + unsigned int tbytes = nbytes; + const u8 *buff; + + ents = sg_nents_for_len(sgl, nbytes); + if (ents < 0) + return ents; + + sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags); + + lzeros = 0; + len = 0; + while (nbytes > 0) { + /* do not strip more than given bytes */ + while (len && !*buff && lzeros < nbytes) { + lzeros++; + len--; + buff++; + } + + if (len && *buff) + break; + + if (!sg_miter_next(&miter)) + break; + + buff = miter.addr; + len = miter.length; + + nbytes -= lzeros; + lzeros = 0; + } + + miter.consumed = lzeros; + sg_miter_stop(&miter); + nbytes -= lzeros; + + return tbytes - nbytes; +} + +static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req, + size_t desclen) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct device *dev = ctx->dev; + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct caam_rsa_key *key = &ctx->key; + struct rsa_edesc *edesc; + gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? + GFP_KERNEL : GFP_ATOMIC; + int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0; + int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes; + int src_nents, dst_nents; + int mapped_src_nents, mapped_dst_nents; + unsigned int diff_size = 0; + int lzeros; + + if (req->src_len > key->n_sz) { + /* + * strip leading zeros and + * return the number of zeros to skip + */ + lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len - + key->n_sz, sg_flags); + if (lzeros < 0) + return ERR_PTR(lzeros); + + req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src, + lzeros); + req_ctx->fixup_src_len = req->src_len - lzeros; + } else { + /* + * input src is less then n key modulus, + * so there will be zero padding + */ + diff_size = key->n_sz - req->src_len; + req_ctx->fixup_src = req->src; + req_ctx->fixup_src_len = req->src_len; + } + + src_nents = sg_nents_for_len(req_ctx->fixup_src, + req_ctx->fixup_src_len); + dst_nents = sg_nents_for_len(req->dst, req->dst_len); + + mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents, + DMA_TO_DEVICE); + if (unlikely(!mapped_src_nents)) { + dev_err(dev, "unable to map source\n"); + return ERR_PTR(-ENOMEM); + } + mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents, + DMA_FROM_DEVICE); + if (unlikely(!mapped_dst_nents)) { + dev_err(dev, "unable to map destination\n"); + goto src_fail; + } + + if (!diff_size && mapped_src_nents == 1) + sec4_sg_len = 0; /* no need for an input hw s/g table */ + else + sec4_sg_len = mapped_src_nents + !!diff_size; + sec4_sg_index = sec4_sg_len; + + if (mapped_dst_nents > 1) + sec4_sg_len += pad_sg_nents(mapped_dst_nents); + else + sec4_sg_len = pad_sg_nents(sec4_sg_len); + + sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry); + + /* allocate space for base edesc, hw desc commands and link tables */ + edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes, flags); + if (!edesc) + goto dst_fail; + + edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen; + if (diff_size) + dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size, + 0); + + if (sec4_sg_index) + sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len, + edesc->sec4_sg + !!diff_size, 0); + + if (mapped_dst_nents > 1) + sg_to_sec4_sg_last(req->dst, req->dst_len, + edesc->sec4_sg + sec4_sg_index, 0); + + /* Save nents for later use in Job Descriptor */ + edesc->src_nents = src_nents; + edesc->dst_nents = dst_nents; + + req_ctx->edesc = edesc; + + if (!sec4_sg_bytes) + return edesc; + + edesc->mapped_src_nents = mapped_src_nents; + edesc->mapped_dst_nents = mapped_dst_nents; + + edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg, + sec4_sg_bytes, DMA_TO_DEVICE); + if (dma_mapping_error(dev, edesc->sec4_sg_dma)) { + dev_err(dev, "unable to map S/G table\n"); + goto sec4_sg_fail; + } + + edesc->sec4_sg_bytes = sec4_sg_bytes; + + print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ", + DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg, + edesc->sec4_sg_bytes, 1); + + return edesc; + +sec4_sg_fail: + kfree(edesc); +dst_fail: + dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); +src_fail: + dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE); + return ERR_PTR(-ENOMEM); +} + +static int akcipher_do_one_req(struct crypto_engine *engine, void *areq) +{ + struct akcipher_request *req = container_of(areq, + struct akcipher_request, + base); + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct device *jrdev = ctx->dev; + u32 *desc = req_ctx->edesc->hw_desc; + int ret; + + req_ctx->edesc->bklog = true; + + ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req); + + if (ret == -ENOSPC && engine->retry_support) + return ret; + + if (ret != -EINPROGRESS) { + rsa_pub_unmap(jrdev, req_ctx->edesc, req); + rsa_io_unmap(jrdev, req_ctx->edesc, req); + kfree(req_ctx->edesc); + } else { + ret = 0; + } + + return ret; +} + +static int set_rsa_pub_pdb(struct akcipher_request *req, + struct rsa_edesc *edesc) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct device *dev = ctx->dev; + struct rsa_pub_pdb *pdb = &edesc->pdb.pub; + int sec4_sg_index = 0; + + pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->n_dma)) { + dev_err(dev, "Unable to map RSA modulus memory\n"); + return -ENOMEM; + } + + pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->e_dma)) { + dev_err(dev, "Unable to map RSA public exponent memory\n"); + dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); + return -ENOMEM; + } + + if (edesc->mapped_src_nents > 1) { + pdb->sgf |= RSA_PDB_SGF_F; + pdb->f_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->mapped_src_nents; + } else { + pdb->f_dma = sg_dma_address(req_ctx->fixup_src); + } + + if (edesc->mapped_dst_nents > 1) { + pdb->sgf |= RSA_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma + + sec4_sg_index * sizeof(struct sec4_sg_entry); + } else { + pdb->g_dma = sg_dma_address(req->dst); + } + + pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz; + pdb->f_len = req_ctx->fixup_src_len; + + return 0; +} + +static int set_rsa_priv_f1_pdb(struct akcipher_request *req, + struct rsa_edesc *edesc) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct device *dev = ctx->dev; + struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1; + int sec4_sg_index = 0; + + pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->n_dma)) { + dev_err(dev, "Unable to map modulus memory\n"); + return -ENOMEM; + } + + pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->d_dma)) { + dev_err(dev, "Unable to map RSA private exponent memory\n"); + dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); + return -ENOMEM; + } + + if (edesc->mapped_src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->mapped_src_nents; + + } else { + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + + pdb->g_dma = sg_dma_address(req_ctx->fixup_src); + } + + if (edesc->mapped_dst_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_F; + pdb->f_dma = edesc->sec4_sg_dma + + sec4_sg_index * sizeof(struct sec4_sg_entry); + } else { + pdb->f_dma = sg_dma_address(req->dst); + } + + pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; + + return 0; +} + +static int set_rsa_priv_f2_pdb(struct akcipher_request *req, + struct rsa_edesc *edesc) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct device *dev = ctx->dev; + struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2; + int sec4_sg_index = 0; + size_t p_sz = key->p_sz; + size_t q_sz = key->q_sz; + + pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->d_dma)) { + dev_err(dev, "Unable to map RSA private exponent memory\n"); + return -ENOMEM; + } + + pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->p_dma)) { + dev_err(dev, "Unable to map RSA prime factor p memory\n"); + goto unmap_d; + } + + pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->q_dma)) { + dev_err(dev, "Unable to map RSA prime factor q memory\n"); + goto unmap_p; + } + + pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, pdb->tmp1_dma)) { + dev_err(dev, "Unable to map RSA tmp1 memory\n"); + goto unmap_q; + } + + pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, pdb->tmp2_dma)) { + dev_err(dev, "Unable to map RSA tmp2 memory\n"); + goto unmap_tmp1; + } + + if (edesc->mapped_src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->mapped_src_nents; + } else { + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + + pdb->g_dma = sg_dma_address(req_ctx->fixup_src); + } + + if (edesc->mapped_dst_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_F; + pdb->f_dma = edesc->sec4_sg_dma + + sec4_sg_index * sizeof(struct sec4_sg_entry); + } else { + pdb->f_dma = sg_dma_address(req->dst); + } + + pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; + pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; + + return 0; + +unmap_tmp1: + dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); +unmap_q: + dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); +unmap_p: + dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); +unmap_d: + dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); + + return -ENOMEM; +} + +static int set_rsa_priv_f3_pdb(struct akcipher_request *req, + struct rsa_edesc *edesc) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct device *dev = ctx->dev; + struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3; + int sec4_sg_index = 0; + size_t p_sz = key->p_sz; + size_t q_sz = key->q_sz; + + pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->p_dma)) { + dev_err(dev, "Unable to map RSA prime factor p memory\n"); + return -ENOMEM; + } + + pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->q_dma)) { + dev_err(dev, "Unable to map RSA prime factor q memory\n"); + goto unmap_p; + } + + pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->dp_dma)) { + dev_err(dev, "Unable to map RSA exponent dp memory\n"); + goto unmap_q; + } + + pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->dq_dma)) { + dev_err(dev, "Unable to map RSA exponent dq memory\n"); + goto unmap_dp; + } + + pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE); + if (dma_mapping_error(dev, pdb->c_dma)) { + dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n"); + goto unmap_dq; + } + + pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, pdb->tmp1_dma)) { + dev_err(dev, "Unable to map RSA tmp1 memory\n"); + goto unmap_qinv; + } + + pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, pdb->tmp2_dma)) { + dev_err(dev, "Unable to map RSA tmp2 memory\n"); + goto unmap_tmp1; + } + + if (edesc->mapped_src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->mapped_src_nents; + } else { + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + + pdb->g_dma = sg_dma_address(req_ctx->fixup_src); + } + + if (edesc->mapped_dst_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_F; + pdb->f_dma = edesc->sec4_sg_dma + + sec4_sg_index * sizeof(struct sec4_sg_entry); + } else { + pdb->f_dma = sg_dma_address(req->dst); + } + + pdb->sgf |= key->n_sz; + pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; + + return 0; + +unmap_tmp1: + dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); +unmap_qinv: + dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE); +unmap_dq: + dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE); +unmap_dp: + dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE); +unmap_q: + dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); +unmap_p: + dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); + + return -ENOMEM; +} + +static int akcipher_enqueue_req(struct device *jrdev, + void (*cbk)(struct device *jrdev, u32 *desc, + u32 err, void *context), + struct akcipher_request *req) +{ + struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev); + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + struct rsa_edesc *edesc = req_ctx->edesc; + u32 *desc = edesc->hw_desc; + int ret; + + req_ctx->akcipher_op_done = cbk; + /* + * Only the backlog request are sent to crypto-engine since the others + * can be handled by CAAM, if free, especially since JR has up to 1024 + * entries (more than the 10 entries from crypto-engine). + */ + if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG) + ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine, + req); + else + ret = caam_jr_enqueue(jrdev, desc, cbk, req); + + if ((ret != -EINPROGRESS) && (ret != -EBUSY)) { + switch (key->priv_form) { + case FORM1: + rsa_priv_f1_unmap(jrdev, edesc, req); + break; + case FORM2: + rsa_priv_f2_unmap(jrdev, edesc, req); + break; + case FORM3: + rsa_priv_f3_unmap(jrdev, edesc, req); + break; + default: + rsa_pub_unmap(jrdev, edesc, req); + } + rsa_io_unmap(jrdev, edesc, req); + kfree(edesc); + } + + return ret; +} + +static int caam_rsa_enc(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc; + int ret; + + if (unlikely(!key->n || !key->e)) + return -EINVAL; + + if (req->dst_len < key->n_sz) { + req->dst_len = key->n_sz; + dev_err(jrdev, "Output buffer length less than parameter n\n"); + return -EOVERFLOW; + } + + /* Allocate extended descriptor */ + edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN); + if (IS_ERR(edesc)) + return PTR_ERR(edesc); + + /* Set RSA Encrypt Protocol Data Block */ + ret = set_rsa_pub_pdb(req, edesc); + if (ret) + goto init_fail; + + /* Initialize Job Descriptor */ + init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub); + + return akcipher_enqueue_req(jrdev, rsa_pub_done, req); + +init_fail: + rsa_io_unmap(jrdev, edesc, req); + kfree(edesc); + return ret; +} + +static int caam_rsa_dec_priv_f1(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc; + int ret; + + /* Allocate extended descriptor */ + edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN); + if (IS_ERR(edesc)) + return PTR_ERR(edesc); + + /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */ + ret = set_rsa_priv_f1_pdb(req, edesc); + if (ret) + goto init_fail; + + /* Initialize Job Descriptor */ + init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1); + + return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); + +init_fail: + rsa_io_unmap(jrdev, edesc, req); + kfree(edesc); + return ret; +} + +static int caam_rsa_dec_priv_f2(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc; + int ret; + + /* Allocate extended descriptor */ + edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN); + if (IS_ERR(edesc)) + return PTR_ERR(edesc); + + /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */ + ret = set_rsa_priv_f2_pdb(req, edesc); + if (ret) + goto init_fail; + + /* Initialize Job Descriptor */ + init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2); + + return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); + +init_fail: + rsa_io_unmap(jrdev, edesc, req); + kfree(edesc); + return ret; +} + +static int caam_rsa_dec_priv_f3(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc; + int ret; + + /* Allocate extended descriptor */ + edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN); + if (IS_ERR(edesc)) + return PTR_ERR(edesc); + + /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */ + ret = set_rsa_priv_f3_pdb(req, edesc); + if (ret) + goto init_fail; + + /* Initialize Job Descriptor */ + init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3); + + return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); + +init_fail: + rsa_io_unmap(jrdev, edesc, req); + kfree(edesc); + return ret; +} + +static int caam_rsa_dec(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + int ret; + + if (unlikely(!key->n || !key->d)) + return -EINVAL; + + if (req->dst_len < key->n_sz) { + req->dst_len = key->n_sz; + dev_err(ctx->dev, "Output buffer length less than parameter n\n"); + return -EOVERFLOW; + } + + if (key->priv_form == FORM3) + ret = caam_rsa_dec_priv_f3(req); + else if (key->priv_form == FORM2) + ret = caam_rsa_dec_priv_f2(req); + else + ret = caam_rsa_dec_priv_f1(req); + + return ret; +} + +static void caam_rsa_free_key(struct caam_rsa_key *key) +{ + kfree_sensitive(key->d); + kfree_sensitive(key->p); + kfree_sensitive(key->q); + kfree_sensitive(key->dp); + kfree_sensitive(key->dq); + kfree_sensitive(key->qinv); + kfree_sensitive(key->tmp1); + kfree_sensitive(key->tmp2); + kfree(key->e); + kfree(key->n); + memset(key, 0, sizeof(*key)); +} + +static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes) +{ + while (!**ptr && *nbytes) { + (*ptr)++; + (*nbytes)--; + } +} + +/** + * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members. + * dP, dQ and qInv could decode to less than corresponding p, q length, as the + * BER-encoding requires that the minimum number of bytes be used to encode the + * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate + * length. + * + * @ptr : pointer to {dP, dQ, qInv} CRT member + * @nbytes: length in bytes of {dP, dQ, qInv} CRT member + * @dstlen: length in bytes of corresponding p or q prime factor + */ +static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen) +{ + u8 *dst; + + caam_rsa_drop_leading_zeros(&ptr, &nbytes); + if (!nbytes) + return NULL; + + dst = kzalloc(dstlen, GFP_KERNEL); + if (!dst) + return NULL; + + memcpy(dst + (dstlen - nbytes), ptr, nbytes); + + return dst; +} + +/** + * caam_read_raw_data - Read a raw byte stream as a positive integer. + * The function skips buffer's leading zeros, copies the remained data + * to a buffer allocated in the GFP_KERNEL zone and returns + * the address of the new buffer. + * + * @buf : The data to read + * @nbytes: The amount of data to read + */ +static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes) +{ + + caam_rsa_drop_leading_zeros(&buf, nbytes); + if (!*nbytes) + return NULL; + + return kmemdup(buf, *nbytes, GFP_KERNEL); +} + +static int caam_rsa_check_key_length(unsigned int len) +{ + if (len > 4096) + return -EINVAL; + return 0; +} + +static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct rsa_key raw_key = {NULL}; + struct caam_rsa_key *rsa_key = &ctx->key; + int ret; + + /* Free the old RSA key if any */ + caam_rsa_free_key(rsa_key); + + ret = rsa_parse_pub_key(&raw_key, key, keylen); + if (ret) + return ret; + + /* Copy key in DMA zone */ + rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_KERNEL); + if (!rsa_key->e) + goto err; + + /* + * Skip leading zeros and copy the positive integer to a buffer + * allocated in the GFP_KERNEL zone. The decryption descriptor + * expects a positive integer for the RSA modulus and uses its length as + * decryption output length. + */ + rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); + if (!rsa_key->n) + goto err; + + if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { + caam_rsa_free_key(rsa_key); + return -EINVAL; + } + + rsa_key->e_sz = raw_key.e_sz; + rsa_key->n_sz = raw_key.n_sz; + + return 0; +err: + caam_rsa_free_key(rsa_key); + return -ENOMEM; +} + +static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx, + struct rsa_key *raw_key) +{ + struct caam_rsa_key *rsa_key = &ctx->key; + size_t p_sz = raw_key->p_sz; + size_t q_sz = raw_key->q_sz; + unsigned aligned_size; + + rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz); + if (!rsa_key->p) + return; + rsa_key->p_sz = p_sz; + + rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz); + if (!rsa_key->q) + goto free_p; + rsa_key->q_sz = q_sz; + + aligned_size = ALIGN(raw_key->p_sz, dma_get_cache_alignment()); + rsa_key->tmp1 = kzalloc(aligned_size, GFP_KERNEL); + if (!rsa_key->tmp1) + goto free_q; + + aligned_size = ALIGN(raw_key->q_sz, dma_get_cache_alignment()); + rsa_key->tmp2 = kzalloc(aligned_size, GFP_KERNEL); + if (!rsa_key->tmp2) + goto free_tmp1; + + rsa_key->priv_form = FORM2; + + rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz); + if (!rsa_key->dp) + goto free_tmp2; + + rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz); + if (!rsa_key->dq) + goto free_dp; + + rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz, + q_sz); + if (!rsa_key->qinv) + goto free_dq; + + rsa_key->priv_form = FORM3; + + return; + +free_dq: + kfree_sensitive(rsa_key->dq); +free_dp: + kfree_sensitive(rsa_key->dp); +free_tmp2: + kfree_sensitive(rsa_key->tmp2); +free_tmp1: + kfree_sensitive(rsa_key->tmp1); +free_q: + kfree_sensitive(rsa_key->q); +free_p: + kfree_sensitive(rsa_key->p); +} + +static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct rsa_key raw_key = {NULL}; + struct caam_rsa_key *rsa_key = &ctx->key; + int ret; + + /* Free the old RSA key if any */ + caam_rsa_free_key(rsa_key); + + ret = rsa_parse_priv_key(&raw_key, key, keylen); + if (ret) + return ret; + + /* Copy key in DMA zone */ + rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_KERNEL); + if (!rsa_key->d) + goto err; + + rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_KERNEL); + if (!rsa_key->e) + goto err; + + /* + * Skip leading zeros and copy the positive integer to a buffer + * allocated in the GFP_KERNEL zone. The decryption descriptor + * expects a positive integer for the RSA modulus and uses its length as + * decryption output length. + */ + rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); + if (!rsa_key->n) + goto err; + + if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { + caam_rsa_free_key(rsa_key); + return -EINVAL; + } + + rsa_key->d_sz = raw_key.d_sz; + rsa_key->e_sz = raw_key.e_sz; + rsa_key->n_sz = raw_key.n_sz; + + caam_rsa_set_priv_key_form(ctx, &raw_key); + + return 0; + +err: + caam_rsa_free_key(rsa_key); + return -ENOMEM; +} + +static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm) +{ + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + + return ctx->key.n_sz; +} + +/* Per session pkc's driver context creation function */ +static int caam_rsa_init_tfm(struct crypto_akcipher *tfm) +{ + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + + akcipher_set_reqsize(tfm, sizeof(struct caam_rsa_req_ctx)); + + ctx->dev = caam_jr_alloc(); + + if (IS_ERR(ctx->dev)) { + pr_err("Job Ring Device allocation for transform failed\n"); + return PTR_ERR(ctx->dev); + } + + ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer, + CAAM_RSA_MAX_INPUT_SIZE - 1, + DMA_TO_DEVICE); + if (dma_mapping_error(ctx->dev, ctx->padding_dma)) { + dev_err(ctx->dev, "unable to map padding\n"); + caam_jr_free(ctx->dev); + return -ENOMEM; + } + + return 0; +} + +/* Per session pkc's driver context cleanup function */ +static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm) +{ + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm); + struct caam_rsa_key *key = &ctx->key; + + dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE - + 1, DMA_TO_DEVICE); + caam_rsa_free_key(key); + caam_jr_free(ctx->dev); +} + +static struct caam_akcipher_alg caam_rsa = { + .akcipher.base = { + .encrypt = caam_rsa_enc, + .decrypt = caam_rsa_dec, + .set_pub_key = caam_rsa_set_pub_key, + .set_priv_key = caam_rsa_set_priv_key, + .max_size = caam_rsa_max_size, + .init = caam_rsa_init_tfm, + .exit = caam_rsa_exit_tfm, + .base = { + .cra_name = "rsa", + .cra_driver_name = "rsa-caam", + .cra_priority = 3000, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct caam_rsa_ctx) + + CRYPTO_DMA_PADDING, + }, + }, + .akcipher.op = { + .do_one_request = akcipher_do_one_req, + }, +}; + +/* Public Key Cryptography module initialization handler */ +int caam_pkc_init(struct device *ctrldev) +{ + struct caam_drv_private *priv = dev_get_drvdata(ctrldev); + u32 pk_inst, pkha; + int err; + init_done = false; + + /* Determine public key hardware accelerator presence. */ + if (priv->era < 10) { + pk_inst = (rd_reg32(&priv->jr[0]->perfmon.cha_num_ls) & + CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; + } else { + pkha = rd_reg32(&priv->jr[0]->vreg.pkha); + pk_inst = pkha & CHA_VER_NUM_MASK; + + /* + * Newer CAAMs support partially disabled functionality. If this is the + * case, the number is non-zero, but this bit is set to indicate that + * no encryption or decryption is supported. Only signing and verifying + * is supported. + */ + if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT) + pk_inst = 0; + } + + /* Do not register algorithms if PKHA is not present. */ + if (!pk_inst) + return 0; + + /* allocate zero buffer, used for padding input */ + zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_KERNEL); + if (!zero_buffer) + return -ENOMEM; + + err = crypto_engine_register_akcipher(&caam_rsa.akcipher); + + if (err) { + kfree(zero_buffer); + dev_warn(ctrldev, "%s alg registration failed\n", + caam_rsa.akcipher.base.base.cra_driver_name); + } else { + init_done = true; + caam_rsa.registered = true; + dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n"); + } + + return err; +} + +void caam_pkc_exit(void) +{ + if (!init_done) + return; + + if (caam_rsa.registered) + crypto_engine_unregister_akcipher(&caam_rsa.akcipher); + + kfree(zero_buffer); +} |