From: Tudor Ambarus Subject: [PATCH v2 3/3] crypto: caam - add support for RSA algorithm Date: Wed, 24 Feb 2016 19:17:17 +0200 Message-ID: <1456334237-20449-1-git-send-email-tudor-dan.ambarus@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , Tudor Ambarus To: Return-path: Received: from mail-bl2on0095.outbound.protection.outlook.com ([65.55.169.95]:7237 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752247AbcBXRte (ORCPT ); Wed, 24 Feb 2016 12:49:34 -0500 Sender: linux-crypto-owner@vger.kernel.org List-ID: Add RSA support to caam driver. Coauthored-by: Yashpal Dutta Signed-off-by: Tudor Ambarus --- v2: use kzfree instead of memset with zero and kfree. drivers/crypto/caam/Kconfig | 13 + drivers/crypto/caam/Makefile | 13 + drivers/crypto/caam/caam_rsaprivkey.asn1 | 11 + drivers/crypto/caam/caam_rsapubkey.asn1 | 4 + drivers/crypto/caam/caampkc.c | 614 +++++++++++++++++++++++++++++++ drivers/crypto/caam/caampkc.h | 106 ++++++ drivers/crypto/caam/desc.h | 2 + drivers/crypto/caam/pdb.h | 16 +- drivers/crypto/caam/pkc_desc.c | 136 +++++++ 9 files changed, 914 insertions(+), 1 deletion(-) create mode 100644 drivers/crypto/caam/caam_rsaprivkey.asn1 create mode 100644 drivers/crypto/caam/caam_rsapubkey.asn1 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..5c1578f 100644 --- a/drivers/crypto/caam/Kconfig +++ b/drivers/crypto/caam/Kconfig @@ -99,6 +99,19 @@ 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_AKCIPHER + select ASN1 + 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..d4a684c 100644 --- a/drivers/crypto/caam/Makefile +++ b/drivers/crypto/caam/Makefile @@ -5,11 +5,24 @@ ifeq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_DEBUG), y) EXTRA_CFLAGS := -DDEBUG endif +$(obj)/caam_rsapubkey-asn1.o: $(obj)/caam_rsapubkey-asn1.c \ + $(obj)/caam_rsapubkey-asn1.h +$(obj)/caam_rsaprivkey-asn1.o: $(obj)/caam_rsaprivkey-asn1.c \ + $(obj)/caam_rsaprivkey-asn1.h + +clean-files += caam_rsapubkey-asn1.c caam_rsapubkey-asn1.h +clean-files += caam_rsaprivkey-asn1.c caam_rsapvivkey-asn1.h + obj-$(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-objs := caam_rsapubkey-asn1.o \ + caam_rsaprivkey-asn1.o \ + caampkc.o \ + pkc_desc.o diff --git a/drivers/crypto/caam/caam_rsaprivkey.asn1 b/drivers/crypto/caam/caam_rsaprivkey.asn1 new file mode 100644 index 0000000..c3a01e2 --- /dev/null +++ b/drivers/crypto/caam/caam_rsaprivkey.asn1 @@ -0,0 +1,11 @@ +RsaPrivKey ::= SEQUENCE { + version INTEGER, + n INTEGER ({ caam_rsa_get_n }), + e INTEGER ({ caam_rsa_get_e }), + d INTEGER ({ caam_rsa_get_d }), + prime1 INTEGER, + prime2 INTEGER, + exponent1 INTEGER, + exponent2 INTEGER, + coefficient INTEGER +} diff --git a/drivers/crypto/caam/caam_rsapubkey.asn1 b/drivers/crypto/caam/caam_rsapubkey.asn1 new file mode 100644 index 0000000..d4bd741 --- /dev/null +++ b/drivers/crypto/caam/caam_rsapubkey.asn1 @@ -0,0 +1,4 @@ +RsaPubKey ::= SEQUENCE { + n INTEGER ({ caam_rsa_get_n }), + e INTEGER ({ caam_rsa_get_e }) +} diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c new file mode 100644 index 0000000..184f1ed --- /dev/null +++ b/drivers/crypto/caam/caampkc.c @@ -0,0 +1,614 @@ +/* + * 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 +#include +#include "caam_rsapubkey-asn1.h" +#include "caam_rsaprivkey-asn1.h" +#include "compat.h" +#include "caampkc.h" +#include "sg_sw_sec4.h" +#include "regs.h" +#include "intern.h" +#include "jr.h" +#include "error.h" + +static int rsa_check_key_length(unsigned int len) +{ + switch (len) { + case 512: + case 1024: + case 1536: + case 2048: + case 3072: + case 4096: + return 0; + } + + return -EINVAL; +} + +int caam_rsa_get_n(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct caam_pkc_context *ctx = context; + const char *ptr = value; + int ret = -EINVAL; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + ctx->key_sz = vlen; + /* In FIPS mode only allow key size 2K & 3K */ + if (fips_enabled && (ctx->key_sz != 256 && ctx->key_sz != 384)) { + dev_err(ctx->dev, "CAAM: RSA: key size not allowed in FIPS mode\n"); + goto err; + } + /* invalid key size provided */ + ret = rsa_check_key_length(ctx->key_sz << 3); + if (ret) + goto err; + + ctx->n = kzalloc(ctx->key_sz, GFP_DMA | GFP_KERNEL); + if (!ctx->n) { + ret = -ENOMEM; + goto err; + } + + memcpy(ctx->n, ptr, ctx->key_sz); + + return 0; +err: + ctx->key_sz = 0; + ctx->n = NULL; + return ret; +} + +int caam_rsa_get_e(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct caam_pkc_context *ctx = context; + const char *ptr = value; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + ctx->e_sz = vlen; + + if (!ctx->key_sz || !vlen || vlen > ctx->key_sz) { + ctx->e = NULL; + return -EINVAL; + } + + ctx->e = kzalloc(ctx->e_sz, GFP_DMA | GFP_KERNEL); + if (!ctx->e) + return -ENOMEM; + + memcpy(ctx->e, ptr, ctx->e_sz); + + return 0; +} + +int caam_rsa_get_d(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct caam_pkc_context *ctx = context; + const char *ptr = value; + int ret = -EINVAL; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + if (!ctx->key_sz || !vlen || vlen > ctx->key_sz) + goto err; + + /* In FIPS mode only allow key size 2K & 3K */ + if (fips_enabled && (vlen != 256 && vlen != 384)) { + dev_err(ctx->dev, "CAAM: RSA: key size not allowed in FIPS mode\n"); + goto err; + } + + ctx->d = kzalloc(ctx->key_sz, GFP_DMA | GFP_KERNEL); + if (!ctx->n) { + ret = -ENOMEM; + goto err; + } + + memcpy(ctx->d, ptr, vlen); + + return 0; +err: + ctx->d = NULL; + return ret; +} + +static void rsa_free_key(struct caam_pkc_context *ctx) +{ + kfree(ctx->n); + ctx->n = NULL; + + kfree(ctx->e); + ctx->e = NULL; + + kzfree(ctx->d); + ctx->d = NULL; + + ctx->key_sz = 0; + ctx->e_sz = 0; +} + +static int caam_rsa_setpubkey(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + struct caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + int ret; + + /* Free the old key if any */ + rsa_free_key(ctx); + + ret = asn1_ber_decoder(&caam_rsapubkey_decoder, ctx, key, keylen); + if (ret < 0) + goto free; + + if (!ctx->n || !ctx->e) { + /* Invalid key provided */ + ret = -EINVAL; + goto free; + } + + return 0; +free: + rsa_free_key(ctx); + return ret; +} + +static int caam_rsa_setprivkey(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + struct caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + int ret; + + /* Free the old key if any */ + rsa_free_key(ctx); + + ret = asn1_ber_decoder(&caam_rsaprivkey_decoder, ctx, key, keylen); + if (ret < 0) + goto free; + + if (!ctx->n || !ctx->e || !ctx->d) { + /* Invalid key provided */ + ret = -EINVAL; + goto free; + } + + return 0; +free: + rsa_free_key(ctx); + 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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + struct rsa_pub_desc *hw_desc = (struct rsa_pub_desc *)edesc->hw_desc; + + dma_unmap_single(dev, hw_desc->n_dma, ctx->key_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, hw_desc->e_dma, ctx->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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + struct rsa_priv_f1_desc *hw_desc = + (struct rsa_priv_f1_desc *)edesc->hw_desc; + + dma_unmap_single(dev, hw_desc->n_dma, ctx->key_sz, DMA_TO_DEVICE); + dma_unmap_single(dev, hw_desc->d_dma, ctx->key_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 caam_pkc_context *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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc = NULL; + size_t desclen = sizeof(struct rsa_pub_desc); + int ret; + + if (unlikely(!ctx->n || !ctx->e)) + return -EINVAL; + + if (req->dst_len < ctx->key_sz) { + req->dst_len = ctx->key_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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + struct device *jrdev = ctx->dev; + struct rsa_edesc *edesc = NULL; + size_t desclen = sizeof(struct rsa_priv_f1_desc); + int ret; + + if (unlikely(!ctx->n || !ctx->d)) + return -EINVAL; + + if (req->dst_len < ctx->key_sz) { + req->dst_len = ctx->key_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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + + return (ctx->n) ? ctx->key_sz : -EINVAL; +} + +/* Per session pkc's driver context creation function */ +static int caam_rsa_init_tfm(struct crypto_akcipher *tfm) +{ + struct caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + + 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); + } + return 0; +} + +/* Per session pkc's driver context cleanup function */ +static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm) +{ + struct caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + + rsa_free_key(ctx); + 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 caam_pkc_context), + }, +}; + +/* 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..9967b2d --- /dev/null +++ b/drivers/crypto/caam/caampkc.h @@ -0,0 +1,106 @@ +/* + * 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 +#include +#include "desc_constr.h" +#include "pdb.h" + +/** + * Internal context of CAAM driver. + * @dev: Job Ring Device pointer for current request + * @n: pointer to RSA modulus + * @e: pointer to RSA public exponent + * @d: pointer to RSA private exponent + * @dma_n: dma address of RSA modulus + * @dma_e: dma address of RSA public exponent + * @dma_d: dma address of RSA private exponent + * @key_sz: length in octets of the RSA modulus n + * @e_sz: length in octets of the RSA public exponent e + */ +struct caam_pkc_context { + struct device *dev; + u8 *n; + u8 *e; + u8 *d; + dma_addr_t dma_n; + dma_addr_t dma_e; + dma_addr_t dma_d; + size_t key_sz; + size_t e_sz; +}; + +/** + * 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..2755c49 --- /dev/null +++ b/drivers/crypto/caam/pkc_desc.c @@ -0,0 +1,136 @@ +/* + * 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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + 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, ctx->n, ctx->key_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, ctx->e, ctx->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 |= (ctx->e_sz << RSA_PDB_E_SHIFT) | ctx->key_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, ctx->key_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 caam_pkc_context *ctx = akcipher_tfm_ctx(tfm); + 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, ctx->n, ctx->key_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, ctx->d, ctx->key_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 |= (ctx->key_sz << RSA_PDB_D_SHIFT) | ctx->key_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, ctx->key_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