// 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);
}
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