diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/crypto/caam/caampkc.c | 1074 |
1 files changed, 1074 insertions, 0 deletions
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c new file mode 100644 index 000000000..f26d62e55 --- /dev/null +++ b/drivers/crypto/caam/caampkc.c @@ -0,0 +1,1074 @@ +/* + * caam - Freescale FSL CAAM support for Public Key Cryptography + * + * Copyright 2016 Freescale Semiconductor, Inc. + * + * 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" + +#define DESC_RSA_PUB_LEN (2 * CAAM_CMD_SZ + sizeof(struct rsa_pub_pdb)) +#define DESC_RSA_PRIV_F1_LEN (2 * CAAM_CMD_SZ + \ + sizeof(struct rsa_priv_f1_pdb)) +#define DESC_RSA_PRIV_F2_LEN (2 * CAAM_CMD_SZ + \ + sizeof(struct rsa_priv_f2_pdb)) +#define DESC_RSA_PRIV_F3_LEN (2 * CAAM_CMD_SZ + \ + sizeof(struct rsa_priv_f3_pdb)) + +static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc, + struct akcipher_request *req) +{ + dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE); + dma_unmap_sg(dev, req->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(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(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(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(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 rsa_edesc *edesc; + + if (err) + caam_jr_strstatus(dev, err); + + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); + + rsa_pub_unmap(dev, edesc, req); + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + akcipher_request_complete(req, err); +} + +static void rsa_priv_f1_done(struct device *dev, u32 *desc, u32 err, + void *context) +{ + struct akcipher_request *req = context; + struct rsa_edesc *edesc; + + if (err) + caam_jr_strstatus(dev, err); + + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); + + rsa_priv_f1_unmap(dev, edesc, req); + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + akcipher_request_complete(req, err); +} + +static void rsa_priv_f2_done(struct device *dev, u32 *desc, u32 err, + void *context) +{ + struct akcipher_request *req = context; + struct rsa_edesc *edesc; + + if (err) + caam_jr_strstatus(dev, err); + + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); + + rsa_priv_f2_unmap(dev, edesc, req); + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + akcipher_request_complete(req, err); +} + +static void rsa_priv_f3_done(struct device *dev, u32 *desc, u32 err, + void *context) +{ + struct akcipher_request *req = context; + struct rsa_edesc *edesc; + + if (err) + caam_jr_strstatus(dev, err); + + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); + + rsa_priv_f3_unmap(dev, edesc, req); + rsa_io_unmap(dev, edesc, req); + kfree(edesc); + + akcipher_request_complete(req, err); +} + +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) { + while (len && !*buff) { + lzeros++; + len--; + buff++; + } + + if (len && *buff) + break; + + sg_miter_next(&miter); + 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(tfm); + struct device *dev = ctx->dev; + struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); + 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 sgc; + int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes; + int src_nents, dst_nents; + int lzeros; + + lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len, sg_flags); + if (lzeros < 0) + return ERR_PTR(lzeros); + + req->src_len -= lzeros; + req->src = scatterwalk_ffwd(req_ctx->src, req->src, lzeros); + + src_nents = sg_nents_for_len(req->src, req->src_len); + dst_nents = sg_nents_for_len(req->dst, req->dst_len); + + if (src_nents > 1) + sec4_sg_len = src_nents; + if (dst_nents > 1) + sec4_sg_len += dst_nents; + + 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, + GFP_DMA | flags); + if (!edesc) + return ERR_PTR(-ENOMEM); + + sgc = dma_map_sg(dev, req->src, src_nents, DMA_TO_DEVICE); + if (unlikely(!sgc)) { + dev_err(dev, "unable to map source\n"); + goto src_fail; + } + + sgc = dma_map_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); + if (unlikely(!sgc)) { + dev_err(dev, "unable to map destination\n"); + goto dst_fail; + } + + edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen; + + sec4_sg_index = 0; + if (src_nents > 1) { + sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0); + sec4_sg_index += src_nents; + } + if (dst_nents > 1) + sg_to_sec4_sg_last(req->dst, dst_nents, + 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; + + if (!sec4_sg_bytes) + return edesc; + + 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; + + return edesc; + +sec4_sg_fail: + dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); +dst_fail: + dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE); +src_fail: + kfree(edesc); + return ERR_PTR(-ENOMEM); +} + +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_ctx *ctx = akcipher_tfm_ctx(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->src_nents > 1) { + pdb->sgf |= RSA_PDB_SGF_F; + pdb->f_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->src_nents; + } else { + pdb->f_dma = sg_dma_address(req->src); + } + + if (edesc->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->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(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->src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->src_nents; + } else { + pdb->g_dma = sg_dma_address(req->src); + } + + if (edesc->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(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->src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->src_nents; + } else { + pdb->g_dma = sg_dma_address(req->src); + } + + if (edesc->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(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->src_nents > 1) { + pdb->sgf |= RSA_PRIV_PDB_SGF_G; + pdb->g_dma = edesc->sec4_sg_dma; + sec4_sg_index += edesc->src_nents; + } else { + pdb->g_dma = sg_dma_address(req->src); + } + + if (edesc->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 caam_rsa_enc(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(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); + + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req); + if (!ret) + return -EINPROGRESS; + + rsa_pub_unmap(jrdev, edesc, 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(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); + + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req); + if (!ret) + return -EINPROGRESS; + + rsa_priv_f1_unmap(jrdev, edesc, 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(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); + + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f2_done, req); + if (!ret) + return -EINPROGRESS; + + rsa_priv_f2_unmap(jrdev, edesc, 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(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); + + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f3_done, req); + if (!ret) + return -EINPROGRESS; + + rsa_priv_f3_unmap(jrdev, edesc, 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(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) +{ + kzfree(key->d); + kzfree(key->p); + kzfree(key->q); + kzfree(key->dp); + kzfree(key->dq); + kzfree(key->qinv); + kzfree(key->tmp1); + kzfree(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_DMA | 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_DMA | 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_DMA | 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(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 = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL); + if (!rsa_key->e) + goto err; + + /* + * Skip leading zeros and copy the positive integer to a buffer + * allocated in the GFP_DMA | 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; + + memcpy(rsa_key->e, raw_key.e, raw_key.e_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; + + 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; + + rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL); + if (!rsa_key->tmp1) + goto free_q; + + rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | 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: + kzfree(rsa_key->dq); +free_dp: + kzfree(rsa_key->dp); +free_tmp2: + kzfree(rsa_key->tmp2); +free_tmp1: + kzfree(rsa_key->tmp1); +free_q: + kzfree(rsa_key->q); +free_p: + kzfree(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(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 = kzalloc(raw_key.d_sz, GFP_DMA | GFP_KERNEL); + if (!rsa_key->d) + goto err; + + rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL); + if (!rsa_key->e) + goto err; + + /* + * Skip leading zeros and copy the positive integer to a buffer + * allocated in the GFP_DMA | 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; + + memcpy(rsa_key->d, raw_key.d, raw_key.d_sz); + memcpy(rsa_key->e, raw_key.e, raw_key.e_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(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(tfm); + + 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); + } + + 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(tfm); + struct caam_rsa_key *key = &ctx->key; + + caam_rsa_free_key(key); + caam_jr_free(ctx->dev); +} + +static struct akcipher_alg caam_rsa = { + .encrypt = caam_rsa_enc, + .decrypt = caam_rsa_dec, + .sign = caam_rsa_dec, + .verify = caam_rsa_enc, + .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, + .reqsize = sizeof(struct caam_rsa_req_ctx), + .base = { + .cra_name = "rsa", + .cra_driver_name = "rsa-caam", + .cra_priority = 3000, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct caam_rsa_ctx), + }, +}; + +/* Public Key Cryptography module initialization handler */ +static int __init caam_pkc_init(void) +{ + struct device_node *dev_node; + struct platform_device *pdev; + struct device *ctrldev; + struct caam_drv_private *priv; + u32 cha_inst, pk_inst; + int err; + + dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0"); + if (!dev_node) { + dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec4.0"); + if (!dev_node) + return -ENODEV; + } + + pdev = of_find_device_by_node(dev_node); + if (!pdev) { + of_node_put(dev_node); + return -ENODEV; + } + + ctrldev = &pdev->dev; + priv = dev_get_drvdata(ctrldev); + of_node_put(dev_node); + + /* + * If priv is NULL, it's probably because the caam driver wasn't + * properly initialized (e.g. RNG4 init failed). Thus, bail out here. + */ + if (!priv) + return -ENODEV; + + /* Determine public key hardware accelerator presence. */ + cha_inst = rd_reg32(&priv->ctrl->perfmon.cha_num_ls); + pk_inst = (cha_inst & CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; + + /* Do not register algorithms if PKHA is not present. */ + if (!pk_inst) + return -ENODEV; + + err = crypto_register_akcipher(&caam_rsa); + if (err) + dev_warn(ctrldev, "%s alg registration failed\n", + caam_rsa.base.cra_driver_name); + else + dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n"); + + return err; +} + +static void __exit caam_pkc_exit(void) +{ + crypto_unregister_akcipher(&caam_rsa); +} + +module_init(caam_pkc_init); +module_exit(caam_pkc_exit); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("FSL CAAM support for PKC functions of crypto API"); +MODULE_AUTHOR("Freescale Semiconductor"); |