Add RSA support to caam driver.
Coauthored-by: Yashpal Dutta <yashpal.dutta@xxxxxxxxxxxxx>
Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@xxxxxxx>
---
drivers/crypto/caam/Kconfig | 12 +
drivers/crypto/caam/Makefile | 4 +
drivers/crypto/caam/caampkc.c | 513 +++++++++++++++++++++++++++++++++++++++++
drivers/crypto/caam/caampkc.h | 84 +++++++
drivers/crypto/caam/desc.h | 2 +
drivers/crypto/caam/pdb.h | 16 +-
drivers/crypto/caam/pkc_desc.c | 138 +++++++++++
7 files changed, 768 insertions(+), 1 deletion(-)
create mode 100644 drivers/crypto/caam/caampkc.c
create mode 100644 drivers/crypto/caam/caampkc.h
create mode 100644 drivers/crypto/caam/pkc_desc.c
diff --git a/drivers/crypto/caam/Kconfig b/drivers/crypto/caam/Kconfig
index 5652a53..5427e63 100644
--- a/drivers/crypto/caam/Kconfig
+++ b/drivers/crypto/caam/Kconfig
@@ -99,6 +99,18 @@ config CRYPTO_DEV_FSL_CAAM_AHASH_API
To compile this as a module, choose M here: the module
will be called caamhash.
+config CRYPTO_DEV_FSL_CAAM_PKC_API
+ tristate "Register public key cryptography implementations with Crypto API"
+ depends on CRYPTO_DEV_FSL_CAAM && CRYPTO_DEV_FSL_CAAM_JR
+ default y
+ select CRYPTO_RSA_HELPER
+ help
+ Selecting this will allow SEC Public key support for RSA.
+ Supported cryptographic primitives: encryption, decryption,
+ signature and verification.
+ To compile this as a module, choose M here: the module
+ will be called caam_pkc.
+
config CRYPTO_DEV_FSL_CAAM_RNG_API
tristate "Register caam device for hwrng API"
depends on CRYPTO_DEV_FSL_CAAM && CRYPTO_DEV_FSL_CAAM_JR
diff --git a/drivers/crypto/caam/Makefile b/drivers/crypto/caam/Makefile
index 550758a..399ad55 100644
--- a/drivers/crypto/caam/Makefile
+++ b/drivers/crypto/caam/Makefile
@@ -5,11 +5,15 @@ ifeq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_DEBUG), y)
EXTRA_CFLAGS := -DDEBUG
endif
+ccflags-y += -I$(srctree)/crypto
+
obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM) += caam.o
obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_JR) += caam_jr.o
obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API) += caamalg.o
obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API) += caamhash.o
obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API) += caamrng.o
+obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caam_pkc.o
caam-objs := ctrl.o
caam_jr-objs := jr.o key_gen.o error.o
+caam_pkc-y := caampkc.o pkc_desc.o
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
new file mode 100644
index 0000000..1c53158
--- /dev/null
+++ b/drivers/crypto/caam/caampkc.c
@@ -0,0 +1,513 @@
+/*
+ * 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 <linux/dma-mapping.h>
+#include <linux/fips.h>
+#include "compat.h"
+#include "caampkc.h"
+#include "sg_sw_sec4.h"
+#include "regs.h"
+#include "intern.h"
+#include "jr.h"
+#include "error.h"
+
+void rsa_free_key(struct rsa_raw_key *key)
+{
+ kzfree(key->d);
+ key->d = NULL;
+
+ kfree(key->e);
+ key->e = NULL;
+
+ kfree(key->n);
+ key->n = NULL;
+
+ key->n_sz = 0;
+ key->e_sz = 0;
+}
+
+static int caam_rsa_setpubkey(struct crypto_akcipher *tfm, const void *key,
+ unsigned int keylen)
+{
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *raw_key = &ctx->key;
+ int ret;
+
+ set_raw_rsa_pub_action(&ctx->action);
+
+ /* Free the old key if any */
+ rsa_free_key(raw_key);
+
+ ret = asn1_ber_decoder(&rsapubkey_decoder, ctx, key, keylen);
+ if (ret < 0)
+ goto free;
+
+ if (!raw_key->n || !raw_key->e) {
+ /* Invalid key provided */
+ ret = -EINVAL;
+ goto free;
+ }
+
+ return 0;
+free:
+ rsa_free_key(raw_key);
+ return ret;
+}
+
+static int caam_rsa_setprivkey(struct crypto_akcipher *tfm, const void *key,
+ unsigned int keylen)
+{
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *raw_key = &ctx->key;
+ int ret;
+
+ set_raw_rsa_priv_action(&ctx->action);
+
+ /* Free the old key if any */
+ rsa_free_key(raw_key);
+
+ ret = asn1_ber_decoder(&rsaprivkey_decoder, ctx, key, keylen);
+ if (ret < 0)
+ goto free;
+
+ if (!raw_key->n || !raw_key->e || !raw_key->d) {
+ /* Invalid key provided */
+ ret = -EINVAL;
+ goto free;
+ }
+
+ return 0;
+free:
+ rsa_free_key(raw_key);
+ return ret;
+}
+
+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 rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct rsa_pub_desc *hw_desc = (struct rsa_pub_desc *)edesc->hw_desc;
+
+ dma_unmap_single(dev, hw_desc->n_dma, key->n_sz, DMA_TO_DEVICE);
+ dma_unmap_single(dev, hw_desc->e_dma, key->e_sz, DMA_TO_DEVICE);
+ dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
+ dma_unmap_sg(dev, req->src, edesc->src_nents, 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 rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct rsa_priv_f1_desc *hw_desc =
+ (struct rsa_priv_f1_desc *)edesc->hw_desc;
+
+ dma_unmap_single(dev, hw_desc->n_dma, key->n_sz, DMA_TO_DEVICE);
+ dma_unmap_single(dev, hw_desc->d_dma, key->n_sz, DMA_TO_DEVICE);
+ dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
+ dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
+}
+
+static size_t skip_to_nonzero(u8 *ptr, size_t nbytes)
+{
+ size_t nr_zeros = 0;
+
+ while (!(*ptr) && nbytes) {
+ nbytes--;
+ ptr++;
+ nr_zeros++;
+ }
+
+ return nr_zeros;
+}
+
+static size_t scatterwalk_skip_zeros(struct scatter_walk *walk, size_t nbytes)
+{
+ size_t len_this_page, nr_zeros, cnt = 0;
+ u8 *vaddr, *ptr;
+
+ for (;;) {
+ nr_zeros = 0;
+ len_this_page = scatterwalk_pagelen(walk);
+
+ if (len_this_page > nbytes)
+ len_this_page = nbytes;
+
+ vaddr = scatterwalk_map(walk);
+ ptr = vaddr;
+ nr_zeros = skip_to_nonzero(ptr, len_this_page);
+ scatterwalk_unmap(vaddr);
+
+ /* count total number of zeros */
+ cnt += nr_zeros;
+
+ /* advance scatterwalk to the nonzero data */
+ scatterwalk_advance(walk, nr_zeros);
+
+ if (nr_zeros < len_this_page || nbytes == len_this_page)
+ break;
+
+ nbytes -= len_this_page;
+
+ scatterwalk_pagedone(walk, 0, 1);
+ }
+
+ return cnt;
+}
+
+/*
+ * This function drops the leading zeros and copies the data to the initial
+ * pointer so that it can be freed later on. Returns the updated data length.
+ */
+static size_t drop_leading_zeros(struct scatterlist *sg, size_t nbytes)
+{
+ struct scatter_walk walk_src, walk_dst;
+ size_t nr_zeros = 0;
+
+ scatterwalk_start(&walk_src, sg);
+ nr_zeros = scatterwalk_skip_zeros(&walk_src, nbytes);
+
+ if (nr_zeros) {
+ nbytes = nbytes - nr_zeros;
+
+ scatterwalk_start(&walk_dst, sg);
+ scatterwalk_sg_copychunks(&walk_dst, &walk_src, nbytes);
+ scatterwalk_done(&walk_dst, 0, 0);
+ }
+
+ scatterwalk_done(&walk_src, 0, 0);
+
+ return nbytes;
+}
+
+/* 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);
+
+ /*
+ * RSA's output is expected to be a big integer. Drop the leading
+ * zeros since they are not meaningful in the world of numbers.
+ */
+ req->dst_len = drop_leading_zeros(req->dst, req->dst_len);
+
+ edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+
+ rsa_pub_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);
+
+ /*
+ * RSA's output is expected to be a big integer. Drop the leading
+ * zeros since they are not meaningful in the world of numbers.
+ */
+ req->dst_len = drop_leading_zeros(req->dst, req->dst_len);
+
+ edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+
+ rsa_priv_f1_unmap(dev, edesc, req);
+ kfree(edesc);
+
+ akcipher_request_complete(req, err);
+}
+
+static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
+ size_t desclen)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct device *dev = ctx->dev;
+ struct rsa_edesc *edesc;
+ gfp_t flags = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP)) ? GFP_KERNEL : GFP_ATOMIC;
+ int sgc;
+ int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
+ int src_nents, dst_nents;
+
+ 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;
+ }
+
+ 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 caam_rsa_enc(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct device *jrdev = ctx->dev;
+ struct rsa_edesc *edesc = NULL;
+ size_t desclen = sizeof(struct rsa_pub_desc);
+ 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, desclen);
+ if (IS_ERR(edesc))
+ return PTR_ERR(edesc);
+
+ /* Initialize Job Descriptor. */
+ ret = init_rsa_pub_desc(req, edesc);
+ if (ret)
+ return ret;
+
+ ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
+ if (!ret) {
+ ret = -EINPROGRESS;
+ } else {
+ rsa_pub_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 rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct device *jrdev = ctx->dev;
+ struct rsa_edesc *edesc = NULL;
+ size_t desclen = sizeof(struct rsa_priv_f1_desc);
+ int ret;
+
+ if (unlikely(!key->n || !key->d))
+ return -EINVAL;
+
+ if (req->dst_len < key->n_sz) {
+ req->dst_len = key->n_sz;
+ return -EOVERFLOW;
+ }
+
+ /* Allocate extended descriptor. */
+ edesc = rsa_edesc_alloc(req, desclen);
+ if (IS_ERR(edesc))
+ return PTR_ERR(edesc);
+
+ /* Initialize Job Descriptor. */
+ ret = init_rsa_priv_f1_desc(req, edesc);
+ if (ret)
+ return ret;
+
+ ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req);
+ if (!ret) {
+ ret = -EINPROGRESS;
+ } else {
+ rsa_priv_f1_unmap(jrdev, edesc, req);
+ kfree(edesc);
+ }
+
+ return ret;
+}
+
+static int caam_rsa_max_size(struct crypto_akcipher *tfm)
+{
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+
+ return (key->n) ? key->n_sz : -EINVAL;
+}
+
+/* Per session pkc's driver context creation function */
+static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
+{
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+
+ ctx->dev = caam_jr_alloc();
+
+ if (IS_ERR(ctx->dev)) {
+ dev_err(ctx->dev, "Job Ring Device allocation for transform failed\n");
+ return PTR_ERR(ctx->dev);
+ }
+
+ key->is_coherent = true;
+ key->flags = GFP_DMA | GFP_KERNEL;
+ return 0;
+}
+
+/* Per session pkc's driver context cleanup function */
+static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
+{
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+
+ rsa_free_key(key);
+ caam_jr_free(ctx->dev);
+}
+
+static struct akcipher_alg rsa = {
+ .encrypt = caam_rsa_enc,
+ .decrypt = caam_rsa_dec,
+ .sign = caam_rsa_dec,
+ .verify = caam_rsa_enc,
+ .set_pub_key = caam_rsa_setpubkey,
+ .set_priv_key = caam_rsa_setprivkey,
+ .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_alignmask = 0,
+ .cra_ctxsize = sizeof(struct rsa_raw_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 = 0;
+
+ 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;
+
+ rsa.base.cra_flags = 0;
+ err = crypto_register_akcipher(&rsa);
+ if (err)
+ dev_warn(ctrldev, "%s alg registration failed\n",
+ rsa.base.cra_driver_name);
+ else
+ dev_info(ctrldev, "caam algorithms registered in /proc/crypto\n");
+
+ return err;
+}
+
+static void __exit caam_pkc_exit(void)
+{
+ crypto_unregister_akcipher(&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");
diff --git a/drivers/crypto/caam/caampkc.h b/drivers/crypto/caam/caampkc.h
new file mode 100644
index 0000000..a49d7da
--- /dev/null
+++ b/drivers/crypto/caam/caampkc.h
@@ -0,0 +1,84 @@
+/*
+ * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
+ *
+ * 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.
+ */
+
+#ifndef _PKC_DESC_H_
+#define _PKC_DESC_H_
+
+#include <crypto/internal/rsa.h>
+#include <crypto/akcipher.h>
+#include <crypto/internal/akcipher.h>
+#include "desc_constr.h"
+#include "pdb.h"
+#include "rsapubkey-asn1.h"
+#include "rsaprivkey-asn1.h"
+
+/**
+ * RSA Pub_Key Descriptor
+ * @desc_hdr: Job Descriptor Header command
+ * @sgf: scatter-gather field
+ * @f_dma: dma address of input data
+ * @g_dma: dma address of ecrypted output data
+ * @n_dma: dma address of RSA public exponent
+ * @dma_e: dma address of RSA public exponent
+ * @f_len: length in octets of the input data
+ * @op: RSA Operation command
+ */
+struct rsa_pub_desc {
+ u32 desc_hdr;
+ u32 sgf;
+ dma_addr_t f_dma;
+ dma_addr_t g_dma;
+ dma_addr_t n_dma;
+ dma_addr_t e_dma;
+ u32 f_len;
+ u32 op;
+} __packed;
+
+/**
+ * Form1 Priv_key Decryption Descriptor.
+ * Private key is represented by (n,d).
+ * @desc_hdr: Job Descriptor Header command
+ * @sgf: scatter-gather field
+ * @g_dma: dma address of ecrypted input data
+ * @f_dma: dma address of output data
+ * @n_dma: dma address of RSA public exponent
+ * @dma_d: dma address of RSA private exponent
+ * @op: RSA Operation command
+ */
+struct rsa_priv_f1_desc {
+ u32 desc_hdr;
+ u32 sgf;
+ dma_addr_t g_dma;
+ dma_addr_t f_dma;
+ dma_addr_t n_dma;
+ dma_addr_t d_dma;
+ u32 op;
+} __packed;
+
+/**
+ * rsa_edesc - s/w-extended rsa descriptor
+ * @src_nents: number of segments in input scatterlist
+ * @dst_nents: number of segments in output scatterlist
+ * @sec4_sg_dma: dma address of h/w link table
+ * @sec4_sg: pointer to h/w link table
+ * @hw_desc: descriptor followed by link tables if any
+ */
+struct rsa_edesc {
+ int src_nents;
+ int dst_nents;
+ dma_addr_t sec4_sg_dma;
+ struct sec4_sg_entry *sec4_sg;
+ u32 hw_desc[];
+};
+
+/* Descriptor construction primitives. */
+int init_rsa_pub_desc(struct akcipher_request *req, struct rsa_edesc *edesc);
+int init_rsa_priv_f1_desc(struct akcipher_request *req,
+ struct rsa_edesc *edesc);
+#endif
diff --git a/drivers/crypto/caam/desc.h b/drivers/crypto/caam/desc.h
index 1e93c6a..7e5c027 100644
--- a/drivers/crypto/caam/desc.h
+++ b/drivers/crypto/caam/desc.h
@@ -454,6 +454,8 @@ struct sec4_sg_entry {
#define OP_PCLID_PUBLICKEYPAIR (0x14 << OP_PCLID_SHIFT)
#define OP_PCLID_DSASIGN (0x15 << OP_PCLID_SHIFT)
#define OP_PCLID_DSAVERIFY (0x16 << OP_PCLID_SHIFT)
+#define OP_PCLID_RSAENC_PUBKEY (0x18 << OP_PCLID_SHIFT)
+#define OP_PCLID_RSADEC_PRVKEY (0x19 << OP_PCLID_SHIFT)
/* Assuming OP_TYPE = OP_TYPE_DECAP_PROTOCOL/ENCAP_PROTOCOL */
#define OP_PCLID_IPSEC (0x01 << OP_PCLID_SHIFT)
diff --git a/drivers/crypto/caam/pdb.h b/drivers/crypto/caam/pdb.h
index 3a87c0c..1c68d7b 100644
--- a/drivers/crypto/caam/pdb.h
+++ b/drivers/crypto/caam/pdb.h
@@ -1,7 +1,7 @@
/*
* CAAM Protocol Data Block (PDB) definition header file
*
- * Copyright 2008-2012 Freescale Semiconductor, Inc.
+ * Copyright 2008-2016 Freescale Semiconductor, Inc.
*
*/
@@ -399,4 +399,18 @@ struct dsa_verify_pdb {
u8 *ab; /* only used if ECC processing */
};
+/* RSA Protocol Data Block */
+#define RSA_PDB_SGF_SHIFT 28
+#define RSA_PDB_E_SHIFT 12
+#define RSA_PDB_E_MASK (0xFFF << RSA_PDB_E_SHIFT)
+#define RSA_PDB_D_SHIFT 12
+#define RSA_PDB_D_MASK (0xFFF << RSA_PDB_D_SHIFT)
+
+#define RSA_PDB_SGF_F (0x8 << RSA_PDB_SGF_SHIFT)
+#define RSA_PDB_SGF_G (0x4 << RSA_PDB_SGF_SHIFT)
+#define RSA_PRIV_PDB_SGF_F (0x4 << RSA_PDB_SGF_SHIFT)
+#define RSA_PRIV_PDB_SGF_G (0x8 << RSA_PDB_SGF_SHIFT)
+
+#define RSA_PRIV_KEY_FRM_1 0
+
#endif
diff --git a/drivers/crypto/caam/pkc_desc.c b/drivers/crypto/caam/pkc_desc.c
new file mode 100644
index 0000000..5ef4082
--- /dev/null
+++ b/drivers/crypto/caam/pkc_desc.c
@@ -0,0 +1,138 @@
+/*
+ * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
+ *
+ * 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 "caampkc.h"
+
+/* Descriptor for RSA Public operation */
+int init_rsa_pub_desc(struct akcipher_request *req, struct rsa_edesc *edesc)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct device *dev = ctx->dev;
+ struct rsa_pub_desc *desc = (struct rsa_pub_desc *)edesc->hw_desc;
+ u32 start_idx, desc_size;
+ int sec4_sg_index = 0;
+
+ /*
+ * The PDB has static fields and can be initialized before writing
+ * a specific command. Map the memory first, since it can be a point
+ * of failure.
+ */
+ desc->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, desc->n_dma)) {
+ dev_err(dev, "Unable to map modulus memory\n");
+ goto n_fail;
+ }
+
+ desc->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, desc->e_dma)) {
+ dev_err(dev, "Unable to map exponent memory\n");
+ goto e_fail;
+ }
+
+ desc_size = sizeof(*desc) / CAAM_CMD_SZ;
+ start_idx = (desc_size - 1) & HDR_START_IDX_MASK;
+ init_job_desc(edesc->hw_desc, (start_idx << HDR_START_IDX_SHIFT) |
+ (start_idx & HDR_DESCLEN_MASK) | HDR_ONE);
+
+ sec4_sg_index = 0;
+ if (edesc->src_nents > 1) {
+ desc->sgf |= RSA_PDB_SGF_F;
+ desc->f_dma = edesc->sec4_sg_dma;
+ sec4_sg_index += edesc->src_nents;
+ } else {
+ desc->f_dma = sg_dma_address(req->src);
+ }
+
+ if (edesc->dst_nents > 1) {
+ desc->sgf |= RSA_PDB_SGF_G;
+ desc->g_dma = edesc->sec4_sg_dma +
+ sec4_sg_index * sizeof(struct sec4_sg_entry);
+ } else {
+ desc->g_dma = sg_dma_address(req->dst);
+ }
+
+ desc->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
+ desc->f_len = req->src_len;
+ desc->op = CMD_OPERATION | OP_TYPE_UNI_PROTOCOL |
+ OP_PCLID_RSAENC_PUBKEY;
+ return 0;
+
+e_fail:
+ dma_unmap_single(dev, desc->n_dma, key->n_sz, DMA_TO_DEVICE);
+n_fail:
+ dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
+ dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
+ kfree(edesc);
+ return -ENOMEM;
+}
+
+/* Descriptor for RSA Private operation */
+int init_rsa_priv_f1_desc(struct akcipher_request *req, struct rsa_edesc *edesc)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct rsa_raw_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_raw_key *key = &ctx->key;
+ struct device *dev = ctx->dev;
+ struct rsa_priv_f1_desc *desc =
+ (struct rsa_priv_f1_desc *)edesc->hw_desc;
+ int sec4_sg_index = 0;
+ u32 start_idx, desc_size;
+
+ /*
+ * The PDB has static fields and can be initialized before writing
+ * a specific command. Map the memory first, since it can be a point
+ * of failure.
+ */
+ desc->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, desc->n_dma)) {
+ dev_err(dev, "Unable to map modulus memory\n");
+ goto n_fail;
+ }
+
+ desc->d_dma = dma_map_single(dev, key->d, key->n_sz, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, desc->d_dma)) {
+ dev_err(dev, "Unable to map exponent memory\n");
+ goto d_fail;
+ }
+
+ desc_size = sizeof(*desc) / CAAM_CMD_SZ;
+ start_idx = (desc_size - 1) & HDR_START_IDX_MASK;
+ init_job_desc(edesc->hw_desc, (start_idx << HDR_START_IDX_SHIFT) |
+ (start_idx & HDR_DESCLEN_MASK) | HDR_ONE);
+
+ if (edesc->src_nents > 1) {
+ desc->sgf |= RSA_PRIV_PDB_SGF_G;
+ desc->g_dma = edesc->sec4_sg_dma;
+ sec4_sg_index += edesc->src_nents;
+ } else {
+ desc->g_dma = sg_dma_address(req->src);
+ }
+
+ if (edesc->dst_nents > 1) {
+ desc->sgf |= RSA_PRIV_PDB_SGF_F;
+ desc->f_dma = edesc->sec4_sg_dma +
+ sec4_sg_index * sizeof(struct sec4_sg_entry);
+ } else {
+ desc->f_dma = sg_dma_address(req->dst);
+ }
+
+ desc->sgf |= (key->n_sz << RSA_PDB_D_SHIFT) | key->n_sz;
+ desc->op = CMD_OPERATION | OP_TYPE_UNI_PROTOCOL |
+ OP_PCLID_RSADEC_PRVKEY | RSA_PRIV_KEY_FRM_1;
+ return 0;
+
+d_fail:
+ dma_unmap_single(dev, desc->n_dma, key->n_sz, DMA_TO_DEVICE);
+n_fail:
+ dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
+ dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
+ kfree(edesc);
+ return -ENOMEM;
+}
--
1.8.3.1
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