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Subject[Patch v4 4/7] crypto: qce: Add support for AEAD algorithms
Date
Introduce support to enable following algorithms in Qualcomm Crypto Engine.

- authenc(hmac(sha1),cbc(des))
- authenc(hmac(sha1),cbc(des3_ede))
- authenc(hmac(sha256),cbc(des))
- authenc(hmac(sha256),cbc(des3_ede))
- authenc(hmac(sha256),cbc(aes))
- ccm(aes)
- rfc4309(ccm(aes))

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---

v1->v2:
- Removed spurious totallen from qce_aead_async_req_handle since
it was unused as pointed out by Hubert.
- Updated qce_dma_prep_sgs to use #nents returned by dma_map_sg rather than
using precomputed #nents.

drivers/crypto/Kconfig | 15 +
drivers/crypto/qce/Makefile | 1 +
drivers/crypto/qce/aead.c | 799 ++++++++++++++++++++++++++++++++++++
drivers/crypto/qce/aead.h | 53 +++
drivers/crypto/qce/common.h | 2 +
drivers/crypto/qce/core.c | 4 +
6 files changed, 874 insertions(+)
create mode 100644 drivers/crypto/qce/aead.c
create mode 100644 drivers/crypto/qce/aead.h

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 9a4c275a1335..1fe5b7eafc02 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -627,6 +627,12 @@ config CRYPTO_DEV_QCE_SHA
select CRYPTO_SHA1
select CRYPTO_SHA256

+config CRYPTO_DEV_QCE_AEAD
+ bool
+ depends on CRYPTO_DEV_QCE
+ select CRYPTO_AUTHENC
+ select CRYPTO_LIB_DES
+
choice
prompt "Algorithms enabled for QCE acceleration"
default CRYPTO_DEV_QCE_ENABLE_ALL
@@ -647,6 +653,7 @@ choice
bool "All supported algorithms"
select CRYPTO_DEV_QCE_SKCIPHER
select CRYPTO_DEV_QCE_SHA
+ select CRYPTO_DEV_QCE_AEAD
help
Enable all supported algorithms:
- AES (CBC, CTR, ECB, XTS)
@@ -672,6 +679,14 @@ choice
- SHA1, HMAC-SHA1
- SHA256, HMAC-SHA256

+ config CRYPTO_DEV_QCE_ENABLE_AEAD
+ bool "AEAD algorithms only"
+ select CRYPTO_DEV_QCE_AEAD
+ help
+ Enable AEAD algorithms only:
+ - authenc()
+ - ccm(aes)
+ - rfc4309(ccm(aes))
endchoice

config CRYPTO_DEV_QCE_SW_MAX_LEN
diff --git a/drivers/crypto/qce/Makefile b/drivers/crypto/qce/Makefile
index 14ade8a7d664..2cf8984e1b85 100644
--- a/drivers/crypto/qce/Makefile
+++ b/drivers/crypto/qce/Makefile
@@ -6,3 +6,4 @@ qcrypto-objs := core.o \

qcrypto-$(CONFIG_CRYPTO_DEV_QCE_SHA) += sha.o
qcrypto-$(CONFIG_CRYPTO_DEV_QCE_SKCIPHER) += skcipher.o
+qcrypto-$(CONFIG_CRYPTO_DEV_QCE_AEAD) += aead.o
diff --git a/drivers/crypto/qce/aead.c b/drivers/crypto/qce/aead.c
new file mode 100644
index 000000000000..ef66ae21eae3
--- /dev/null
+++ b/drivers/crypto/qce/aead.c
@@ -0,0 +1,799 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright (C) 2021, Linaro Limited. All rights reserved.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <crypto/gcm.h>
+#include <crypto/authenc.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/des.h>
+#include <crypto/sha1.h>
+#include <crypto/sha2.h>
+#include <crypto/scatterwalk.h>
+#include "aead.h"
+
+#define CCM_NONCE_ADATA_SHIFT 6
+#define CCM_NONCE_AUTHSIZE_SHIFT 3
+#define MAX_CCM_ADATA_HEADER_LEN 6
+
+static LIST_HEAD(aead_algs);
+
+static void qce_aead_done(void *data)
+{
+ struct crypto_async_request *async_req = data;
+ struct aead_request *req = aead_request_cast(async_req);
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_aead_ctx *ctx = crypto_tfm_ctx(async_req->tfm);
+ struct qce_alg_template *tmpl = to_aead_tmpl(crypto_aead_reqtfm(req));
+ struct qce_device *qce = tmpl->qce;
+ struct qce_result_dump *result_buf = qce->dma.result_buf;
+ enum dma_data_direction dir_src, dir_dst;
+ bool diff_dst;
+ int error;
+ u32 status;
+ unsigned int totallen;
+ unsigned char tag[SHA256_DIGEST_SIZE] = {0};
+ int ret = 0;
+
+ diff_dst = (req->src != req->dst) ? true : false;
+ dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
+ dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
+
+ error = qce_dma_terminate_all(&qce->dma);
+ if (error)
+ dev_dbg(qce->dev, "aead dma termination error (%d)\n",
+ error);
+ if (diff_dst)
+ dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
+
+ dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+
+ if (IS_CCM(rctx->flags)) {
+ if (req->assoclen) {
+ sg_free_table(&rctx->src_tbl);
+ if (diff_dst)
+ sg_free_table(&rctx->dst_tbl);
+ } else {
+ if (!(IS_DECRYPT(rctx->flags) && !diff_dst))
+ sg_free_table(&rctx->dst_tbl);
+ }
+ } else {
+ sg_free_table(&rctx->dst_tbl);
+ }
+
+ error = qce_check_status(qce, &status);
+ if (error < 0 && (error != -EBADMSG))
+ dev_err(qce->dev, "aead operation error (%x)\n", status);
+
+ if (IS_ENCRYPT(rctx->flags)) {
+ totallen = req->cryptlen + req->assoclen;
+ if (IS_CCM(rctx->flags))
+ scatterwalk_map_and_copy(rctx->ccmresult_buf, req->dst,
+ totallen, ctx->authsize, 1);
+ else
+ scatterwalk_map_and_copy(result_buf->auth_iv, req->dst,
+ totallen, ctx->authsize, 1);
+
+ } else if (!IS_CCM(rctx->flags)) {
+ totallen = req->cryptlen + req->assoclen - ctx->authsize;
+ scatterwalk_map_and_copy(tag, req->src, totallen, ctx->authsize, 0);
+ ret = memcmp(result_buf->auth_iv, tag, ctx->authsize);
+ if (ret) {
+ pr_err("Bad message error\n");
+ error = -EBADMSG;
+ }
+ }
+
+ qce->async_req_done(qce, error);
+}
+
+static struct scatterlist *
+qce_aead_prepare_result_buf(struct sg_table *tbl, struct aead_request *req)
+{
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_alg_template *tmpl = to_aead_tmpl(crypto_aead_reqtfm(req));
+ struct qce_device *qce = tmpl->qce;
+
+ sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
+ return qce_sgtable_add(tbl, &rctx->result_sg, QCE_RESULT_BUF_SZ);
+}
+
+static struct scatterlist *
+qce_aead_prepare_ccm_result_buf(struct sg_table *tbl, struct aead_request *req)
+{
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+
+ sg_init_one(&rctx->result_sg, rctx->ccmresult_buf, QCE_BAM_BURST_SIZE);
+ return qce_sgtable_add(tbl, &rctx->result_sg, QCE_BAM_BURST_SIZE);
+}
+
+static struct scatterlist *
+qce_aead_prepare_dst_buf(struct aead_request *req)
+{
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_alg_template *tmpl = to_aead_tmpl(crypto_aead_reqtfm(req));
+ struct qce_device *qce = tmpl->qce;
+ struct scatterlist *sg, *msg_sg, __sg[2];
+ gfp_t gfp;
+ unsigned int assoclen = req->assoclen;
+ unsigned int totallen;
+ int ret;
+
+ totallen = rctx->cryptlen + assoclen;
+ rctx->dst_nents = sg_nents_for_len(req->dst, totallen);
+ if (rctx->dst_nents < 0) {
+ dev_err(qce->dev, "Invalid numbers of dst SG.\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if (IS_CCM(rctx->flags))
+ rctx->dst_nents += 2;
+ else
+ rctx->dst_nents += 1;
+
+ gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+ GFP_KERNEL : GFP_ATOMIC;
+ ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (IS_CCM(rctx->flags) && assoclen) {
+ /* Get the dst buffer */
+ msg_sg = scatterwalk_ffwd(__sg, req->dst, assoclen);
+
+ sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->adata_sg,
+ rctx->assoclen);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto dst_tbl_free;
+ }
+ /* dst buffer */
+ sg = qce_sgtable_add(&rctx->dst_tbl, msg_sg, rctx->cryptlen);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto dst_tbl_free;
+ }
+ totallen = rctx->cryptlen + rctx->assoclen;
+ } else {
+ if (totallen) {
+ sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, totallen);
+ if (IS_ERR(sg))
+ goto dst_tbl_free;
+ }
+ }
+ if (IS_CCM(rctx->flags))
+ sg = qce_aead_prepare_ccm_result_buf(&rctx->dst_tbl, req);
+ else
+ sg = qce_aead_prepare_result_buf(&rctx->dst_tbl, req);
+
+ if (IS_ERR(sg))
+ goto dst_tbl_free;
+
+ sg_mark_end(sg);
+ rctx->dst_sg = rctx->dst_tbl.sgl;
+ rctx->dst_nents = sg_nents_for_len(rctx->dst_sg, totallen) + 1;
+
+ return sg;
+
+dst_tbl_free:
+ sg_free_table(&rctx->dst_tbl);
+ return sg;
+}
+
+static int
+qce_aead_ccm_prepare_buf_assoclen(struct aead_request *req)
+{
+ struct scatterlist *sg, *msg_sg, __sg[2];
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ unsigned int assoclen = rctx->assoclen;
+ unsigned int adata_header_len, cryptlen, totallen;
+ gfp_t gfp;
+ bool diff_dst;
+ int ret;
+
+ if (IS_DECRYPT(rctx->flags))
+ cryptlen = rctx->cryptlen + ctx->authsize;
+ else
+ cryptlen = rctx->cryptlen;
+ totallen = cryptlen + req->assoclen;
+
+ /* Get the msg */
+ msg_sg = scatterwalk_ffwd(__sg, req->src, req->assoclen);
+
+ rctx->adata = kzalloc((ALIGN(assoclen, 16) + MAX_CCM_ADATA_HEADER_LEN) *
+ sizeof(unsigned char), GFP_ATOMIC);
+ if (!rctx->adata)
+ return -ENOMEM;
+
+ /*
+ * Format associated data (RFC3610 and NIST 800-38C)
+ * Even though specification allows for AAD to be up to 2^64 - 1 bytes,
+ * the assoclen field in aead_request is unsigned int and thus limits
+ * the AAD to be up to 2^32 - 1 bytes. So we handle only two scenarios
+ * while forming the header for AAD.
+ */
+ if (assoclen < 0xff00) {
+ adata_header_len = 2;
+ *(__be16 *)rctx->adata = cpu_to_be16(assoclen);
+ } else {
+ adata_header_len = 6;
+ *(__be16 *)rctx->adata = cpu_to_be16(0xfffe);
+ *(__be32 *)(rctx->adata + 2) = cpu_to_be32(assoclen);
+ }
+
+ /* Copy the associated data */
+ if (sg_copy_to_buffer(req->src, sg_nents_for_len(req->src, assoclen),
+ rctx->adata + adata_header_len,
+ assoclen) != assoclen)
+ return -EINVAL;
+
+ /* Pad associated data to block size */
+ rctx->assoclen = ALIGN(assoclen + adata_header_len, 16);
+
+ diff_dst = (req->src != req->dst) ? true : false;
+
+ if (diff_dst)
+ rctx->src_nents = sg_nents_for_len(req->src, totallen) + 1;
+ else
+ rctx->src_nents = sg_nents_for_len(req->src, totallen) + 2;
+
+ gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
+ ret = sg_alloc_table(&rctx->src_tbl, rctx->src_nents, gfp);
+ if (ret)
+ return ret;
+
+ /* Associated Data */
+ sg_init_one(&rctx->adata_sg, rctx->adata, rctx->assoclen);
+ sg = qce_sgtable_add(&rctx->src_tbl, &rctx->adata_sg,
+ rctx->assoclen);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto err_free;
+ }
+ /* src msg */
+ sg = qce_sgtable_add(&rctx->src_tbl, msg_sg, cryptlen);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto err_free;
+ }
+ if (!diff_dst) {
+ /*
+ * For decrypt, when src and dst buffers are same, there is already space
+ * in the buffer for padded 0's which is output in lieu of
+ * the MAC that is input. So skip the below.
+ */
+ if (!IS_DECRYPT(rctx->flags)) {
+ sg = qce_aead_prepare_ccm_result_buf(&rctx->src_tbl, req);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto err_free;
+ }
+ }
+ }
+ sg_mark_end(sg);
+ rctx->src_sg = rctx->src_tbl.sgl;
+ totallen = cryptlen + rctx->assoclen;
+ rctx->src_nents = sg_nents_for_len(rctx->src_sg, totallen);
+
+ if (diff_dst) {
+ sg = qce_aead_prepare_dst_buf(req);
+ if (IS_ERR(sg))
+ goto err_free;
+ } else {
+ if (IS_ENCRYPT(rctx->flags))
+ rctx->dst_nents = rctx->src_nents + 1;
+ else
+ rctx->dst_nents = rctx->src_nents;
+ rctx->dst_sg = rctx->src_sg;
+ }
+
+ return 0;
+err_free:
+ sg_free_table(&rctx->src_tbl);
+ return ret;
+}
+
+static int qce_aead_prepare_buf(struct aead_request *req)
+{
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_alg_template *tmpl = to_aead_tmpl(crypto_aead_reqtfm(req));
+ struct qce_device *qce = tmpl->qce;
+ struct scatterlist *sg;
+ bool diff_dst = (req->src != req->dst) ? true : false;
+ unsigned int totallen;
+
+ totallen = rctx->cryptlen + rctx->assoclen;
+
+ sg = qce_aead_prepare_dst_buf(req);
+ if (IS_ERR(sg))
+ return PTR_ERR(sg);
+ if (diff_dst) {
+ rctx->src_nents = sg_nents_for_len(req->src, totallen);
+ if (rctx->src_nents < 0) {
+ dev_err(qce->dev, "Invalid numbers of src SG.\n");
+ return -EINVAL;
+ }
+ rctx->src_sg = req->src;
+ } else {
+ rctx->src_nents = rctx->dst_nents - 1;
+ rctx->src_sg = rctx->dst_sg;
+ }
+ return 0;
+}
+
+static int qce_aead_ccm_prepare_buf(struct aead_request *req)
+{
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct scatterlist *sg;
+ bool diff_dst = (req->src != req->dst) ? true : false;
+ unsigned int cryptlen;
+
+ if (rctx->assoclen)
+ return qce_aead_ccm_prepare_buf_assoclen(req);
+
+ if (IS_ENCRYPT(rctx->flags))
+ return qce_aead_prepare_buf(req);
+
+ cryptlen = rctx->cryptlen + ctx->authsize;
+ if (diff_dst) {
+ rctx->src_nents = sg_nents_for_len(req->src, cryptlen);
+ rctx->src_sg = req->src;
+ sg = qce_aead_prepare_dst_buf(req);
+ if (IS_ERR(sg))
+ return PTR_ERR(sg);
+ } else {
+ rctx->src_nents = sg_nents_for_len(req->src, cryptlen);
+ rctx->src_sg = req->src;
+ rctx->dst_nents = rctx->src_nents;
+ rctx->dst_sg = rctx->src_sg;
+ }
+
+ return 0;
+}
+
+static int qce_aead_create_ccm_nonce(struct qce_aead_reqctx *rctx, struct qce_aead_ctx *ctx)
+{
+ unsigned int msglen_size, ivsize;
+ u8 msg_len[4];
+ int i;
+
+ if (!rctx || !rctx->iv)
+ return -EINVAL;
+
+ msglen_size = rctx->iv[0] + 1;
+
+ /* Verify that msg len size is valid */
+ if (msglen_size < 2 || msglen_size > 8)
+ return -EINVAL;
+
+ ivsize = rctx->ivsize;
+
+ /*
+ * Clear the msglen bytes in IV.
+ * Else the h/w engine and nonce will use any stray value pending there.
+ */
+ if (!IS_CCM_RFC4309(rctx->flags)) {
+ for (i = 0; i < msglen_size; i++)
+ rctx->iv[ivsize - i - 1] = 0;
+ }
+
+ /*
+ * The crypto framework encodes cryptlen as unsigned int. Thus, even though
+ * spec allows for upto 8 bytes to encode msg_len only 4 bytes are needed.
+ */
+ if (msglen_size > 4)
+ msglen_size = 4;
+
+ memcpy(&msg_len[0], &rctx->cryptlen, 4);
+
+ memcpy(&rctx->ccm_nonce[0], rctx->iv, rctx->ivsize);
+ if (rctx->assoclen)
+ rctx->ccm_nonce[0] |= 1 << CCM_NONCE_ADATA_SHIFT;
+ rctx->ccm_nonce[0] |= ((ctx->authsize - 2) / 2) <<
+ CCM_NONCE_AUTHSIZE_SHIFT;
+ for (i = 0; i < msglen_size; i++)
+ rctx->ccm_nonce[QCE_MAX_NONCE - i - 1] = msg_len[i];
+
+ return 0;
+}
+
+static int
+qce_aead_async_req_handle(struct crypto_async_request *async_req)
+{
+ struct aead_request *req = aead_request_cast(async_req);
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct qce_aead_ctx *ctx = crypto_tfm_ctx(async_req->tfm);
+ struct qce_alg_template *tmpl = to_aead_tmpl(crypto_aead_reqtfm(req));
+ struct qce_device *qce = tmpl->qce;
+ enum dma_data_direction dir_src, dir_dst;
+ bool diff_dst;
+ int dst_nents, src_nents, ret;
+
+ if (IS_CCM_RFC4309(rctx->flags)) {
+ memset(rctx->ccm_rfc4309_iv, 0, QCE_MAX_IV_SIZE);
+ rctx->ccm_rfc4309_iv[0] = 3;
+ memcpy(&rctx->ccm_rfc4309_iv[1], ctx->ccm4309_salt, QCE_CCM4309_SALT_SIZE);
+ memcpy(&rctx->ccm_rfc4309_iv[4], req->iv, 8);
+ rctx->iv = rctx->ccm_rfc4309_iv;
+ rctx->ivsize = AES_BLOCK_SIZE;
+ } else {
+ rctx->iv = req->iv;
+ rctx->ivsize = crypto_aead_ivsize(tfm);
+ }
+ if (IS_CCM_RFC4309(rctx->flags))
+ rctx->assoclen = req->assoclen - 8;
+ else
+ rctx->assoclen = req->assoclen;
+
+ diff_dst = (req->src != req->dst) ? true : false;
+ dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
+ dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
+
+ if (IS_CCM(rctx->flags)) {
+ ret = qce_aead_create_ccm_nonce(rctx, ctx);
+ if (ret)
+ return ret;
+ }
+ if (IS_CCM(rctx->flags))
+ ret = qce_aead_ccm_prepare_buf(req);
+ else
+ ret = qce_aead_prepare_buf(req);
+
+ if (ret)
+ return ret;
+ dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+ if (dst_nents < 0)
+ goto error_free;
+
+ if (diff_dst) {
+ src_nents = dma_map_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
+ if (src_nents < 0)
+ goto error_unmap_dst;
+ } else {
+ if (IS_CCM(rctx->flags) && IS_DECRYPT(rctx->flags))
+ src_nents = dst_nents;
+ else
+ src_nents = dst_nents - 1;
+ }
+
+ ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, src_nents, rctx->dst_sg, dst_nents,
+ qce_aead_done, async_req);
+ if (ret)
+ goto error_unmap_src;
+
+ qce_dma_issue_pending(&qce->dma);
+
+ ret = qce_start(async_req, tmpl->crypto_alg_type);
+ if (ret)
+ goto error_terminate;
+
+ return 0;
+
+error_terminate:
+ qce_dma_terminate_all(&qce->dma);
+error_unmap_src:
+ if (diff_dst)
+ dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
+error_unmap_dst:
+ dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+error_free:
+ if (IS_CCM(rctx->flags) && rctx->assoclen) {
+ sg_free_table(&rctx->src_tbl);
+ if (diff_dst)
+ sg_free_table(&rctx->dst_tbl);
+ } else {
+ sg_free_table(&rctx->dst_tbl);
+ }
+ return ret;
+}
+
+static int qce_aead_crypt(struct aead_request *req, int encrypt)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct qce_aead_reqctx *rctx = aead_request_ctx(req);
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct qce_alg_template *tmpl = to_aead_tmpl(tfm);
+ unsigned int blocksize = crypto_aead_blocksize(tfm);
+
+ rctx->flags = tmpl->alg_flags;
+ rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
+
+ if (encrypt)
+ rctx->cryptlen = req->cryptlen;
+ else
+ rctx->cryptlen = req->cryptlen - ctx->authsize;
+
+ /* CE does not handle 0 length messages */
+ if (!rctx->cryptlen) {
+ if (!(IS_CCM(rctx->flags) && IS_DECRYPT(rctx->flags)))
+ return -EINVAL;
+ }
+
+ /*
+ * CBC algorithms require message lengths to be
+ * multiples of block size.
+ */
+ if (IS_CBC(rctx->flags) && !IS_ALIGNED(rctx->cryptlen, blocksize))
+ return -EINVAL;
+
+ /* RFC4309 supported AAD size 16 bytes/20 bytes */
+ if (IS_CCM_RFC4309(rctx->flags))
+ if (crypto_ipsec_check_assoclen(req->assoclen))
+ return -EINVAL;
+
+ return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
+}
+
+static int qce_aead_encrypt(struct aead_request *req)
+{
+ return qce_aead_crypt(req, 1);
+}
+
+static int qce_aead_decrypt(struct aead_request *req)
+{
+ return qce_aead_crypt(req, 0);
+}
+
+static int qce_aead_ccm_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
+
+ if (IS_CCM_RFC4309(flags)) {
+ if (keylen < QCE_CCM4309_SALT_SIZE)
+ return -EINVAL;
+ keylen -= QCE_CCM4309_SALT_SIZE;
+ memcpy(ctx->ccm4309_salt, key + keylen, QCE_CCM4309_SALT_SIZE);
+ }
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ ctx->enc_keylen = keylen;
+ ctx->auth_keylen = keylen;
+
+ memcpy(ctx->enc_key, key, keylen);
+ memcpy(ctx->auth_key, key, keylen);
+
+ return 0;
+}
+
+static int qce_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
+{
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct crypto_authenc_keys authenc_keys;
+ unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
+ u32 _key[6];
+ int err;
+
+ err = crypto_authenc_extractkeys(&authenc_keys, key, keylen);
+ if (err)
+ return err;
+
+ if (authenc_keys.enckeylen > QCE_MAX_KEY_SIZE ||
+ authenc_keys.authkeylen > QCE_MAX_KEY_SIZE)
+ return -EINVAL;
+
+ if (IS_DES(flags)) {
+ err = verify_aead_des_key(tfm, authenc_keys.enckey, authenc_keys.enckeylen);
+ if (err)
+ return err;
+ } else if (IS_3DES(flags)) {
+ err = verify_aead_des3_key(tfm, authenc_keys.enckey, authenc_keys.enckeylen);
+ if (err)
+ return err;
+ /*
+ * The crypto engine does not support any two keys
+ * being the same for triple des algorithms. The
+ * verify_skcipher_des3_key does not check for all the
+ * below conditions. Return -EINVAL in case any two keys
+ * are the same. Revisit to see if a fallback cipher
+ * is needed to handle this condition.
+ */
+ memcpy(_key, authenc_keys.enckey, DES3_EDE_KEY_SIZE);
+ if (!((_key[0] ^ _key[2]) | (_key[1] ^ _key[3])) ||
+ !((_key[2] ^ _key[4]) | (_key[3] ^ _key[5])) ||
+ !((_key[0] ^ _key[4]) | (_key[1] ^ _key[5])))
+ return -EINVAL;
+ } else if (IS_AES(flags)) {
+ /* No random key sizes */
+ if (authenc_keys.enckeylen != AES_KEYSIZE_128 &&
+ authenc_keys.enckeylen != AES_KEYSIZE_256)
+ return -EINVAL;
+ }
+
+ ctx->enc_keylen = authenc_keys.enckeylen;
+ ctx->auth_keylen = authenc_keys.authkeylen;
+
+ memcpy(ctx->enc_key, authenc_keys.enckey, authenc_keys.enckeylen);
+
+ memset(ctx->auth_key, 0, sizeof(ctx->auth_key));
+ memcpy(ctx->auth_key, authenc_keys.authkey, authenc_keys.authkeylen);
+
+ return 0;
+}
+
+static int qce_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
+
+ if (IS_CCM(flags)) {
+ if (authsize < 4 || authsize > 16 || authsize % 2)
+ return -EINVAL;
+ if (IS_CCM_RFC4309(flags) && (authsize < 8 || authsize % 4))
+ return -EINVAL;
+ }
+ ctx->authsize = authsize;
+ return 0;
+}
+
+static int qce_aead_init(struct crypto_aead *tfm)
+{
+ crypto_aead_set_reqsize(tfm, sizeof(struct qce_aead_reqctx));
+ return 0;
+}
+
+struct qce_aead_def {
+ unsigned long flags;
+ const char *name;
+ const char *drv_name;
+ unsigned int blocksize;
+ unsigned int chunksize;
+ unsigned int ivsize;
+ unsigned int maxauthsize;
+};
+
+static const struct qce_aead_def aead_def[] = {
+ {
+ .flags = QCE_ALG_DES | QCE_MODE_CBC | QCE_HASH_SHA1_HMAC,
+ .name = "authenc(hmac(sha1),cbc(des))",
+ .drv_name = "authenc-hmac-sha1-cbc-des-qce",
+ .blocksize = DES_BLOCK_SIZE,
+ .ivsize = DES_BLOCK_SIZE,
+ .maxauthsize = SHA1_DIGEST_SIZE,
+ },
+ {
+ .flags = QCE_ALG_3DES | QCE_MODE_CBC | QCE_HASH_SHA1_HMAC,
+ .name = "authenc(hmac(sha1),cbc(des3_ede))",
+ .drv_name = "authenc-hmac-sha1-cbc-3des-qce",
+ .blocksize = DES3_EDE_BLOCK_SIZE,
+ .ivsize = DES3_EDE_BLOCK_SIZE,
+ .maxauthsize = SHA1_DIGEST_SIZE,
+ },
+ {
+ .flags = QCE_ALG_DES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
+ .name = "authenc(hmac(sha256),cbc(des))",
+ .drv_name = "authenc-hmac-sha256-cbc-des-qce",
+ .blocksize = DES_BLOCK_SIZE,
+ .ivsize = DES_BLOCK_SIZE,
+ .maxauthsize = SHA256_DIGEST_SIZE,
+ },
+ {
+ .flags = QCE_ALG_3DES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
+ .name = "authenc(hmac(sha256),cbc(des3_ede))",
+ .drv_name = "authenc-hmac-sha256-cbc-3des-qce",
+ .blocksize = DES3_EDE_BLOCK_SIZE,
+ .ivsize = DES3_EDE_BLOCK_SIZE,
+ .maxauthsize = SHA256_DIGEST_SIZE,
+ },
+ {
+ .flags = QCE_ALG_AES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
+ .name = "authenc(hmac(sha256),cbc(aes))",
+ .drv_name = "authenc-hmac-sha256-cbc-aes-qce",
+ .blocksize = AES_BLOCK_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .maxauthsize = SHA256_DIGEST_SIZE,
+ },
+ {
+ .flags = QCE_ALG_AES | QCE_MODE_CCM,
+ .name = "ccm(aes)",
+ .drv_name = "ccm-aes-qce",
+ .blocksize = 1,
+ .ivsize = AES_BLOCK_SIZE,
+ .maxauthsize = AES_BLOCK_SIZE,
+ },
+ {
+ .flags = QCE_ALG_AES | QCE_MODE_CCM | QCE_MODE_CCM_RFC4309,
+ .name = "rfc4309(ccm(aes))",
+ .drv_name = "rfc4309-ccm-aes-qce",
+ .blocksize = 1,
+ .ivsize = 8,
+ .maxauthsize = AES_BLOCK_SIZE,
+ },
+};
+
+static int qce_aead_register_one(const struct qce_aead_def *def, struct qce_device *qce)
+{
+ struct qce_alg_template *tmpl;
+ struct aead_alg *alg;
+ int ret;
+
+ tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
+ if (!tmpl)
+ return -ENOMEM;
+
+ alg = &tmpl->alg.aead;
+
+ snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+ snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ def->drv_name);
+
+ alg->base.cra_blocksize = def->blocksize;
+ alg->chunksize = def->chunksize;
+ alg->ivsize = def->ivsize;
+ alg->maxauthsize = def->maxauthsize;
+ if (IS_CCM(def->flags))
+ alg->setkey = qce_aead_ccm_setkey;
+ else
+ alg->setkey = qce_aead_setkey;
+ alg->setauthsize = qce_aead_setauthsize;
+ alg->encrypt = qce_aead_encrypt;
+ alg->decrypt = qce_aead_decrypt;
+ alg->init = qce_aead_init;
+
+ alg->base.cra_priority = 300;
+ alg->base.cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_ALLOCATES_MEMORY |
+ CRYPTO_ALG_KERN_DRIVER_ONLY;
+ alg->base.cra_ctxsize = sizeof(struct qce_aead_ctx);
+ alg->base.cra_alignmask = 0;
+ alg->base.cra_module = THIS_MODULE;
+
+ INIT_LIST_HEAD(&tmpl->entry);
+ tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_AEAD;
+ tmpl->alg_flags = def->flags;
+ tmpl->qce = qce;
+
+ ret = crypto_register_aead(alg);
+ if (ret) {
+ kfree(tmpl);
+ dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
+ return ret;
+ }
+
+ list_add_tail(&tmpl->entry, &aead_algs);
+ dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name);
+ return 0;
+}
+
+static void qce_aead_unregister(struct qce_device *qce)
+{
+ struct qce_alg_template *tmpl, *n;
+
+ list_for_each_entry_safe(tmpl, n, &aead_algs, entry) {
+ crypto_unregister_aead(&tmpl->alg.aead);
+ list_del(&tmpl->entry);
+ kfree(tmpl);
+ }
+}
+
+static int qce_aead_register(struct qce_device *qce)
+{
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(aead_def); i++) {
+ ret = qce_aead_register_one(&aead_def[i], qce);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+err:
+ qce_aead_unregister(qce);
+ return ret;
+}
+
+const struct qce_algo_ops aead_ops = {
+ .type = CRYPTO_ALG_TYPE_AEAD,
+ .register_algs = qce_aead_register,
+ .unregister_algs = qce_aead_unregister,
+ .async_req_handle = qce_aead_async_req_handle,
+};
diff --git a/drivers/crypto/qce/aead.h b/drivers/crypto/qce/aead.h
new file mode 100644
index 000000000000..3d1f2039930b
--- /dev/null
+++ b/drivers/crypto/qce/aead.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, Linaro Limited. All rights reserved.
+ */
+
+#ifndef _AEAD_H_
+#define _AEAD_H_
+
+#include "common.h"
+#include "core.h"
+
+#define QCE_MAX_KEY_SIZE 64
+#define QCE_CCM4309_SALT_SIZE 3
+
+struct qce_aead_ctx {
+ u8 enc_key[QCE_MAX_KEY_SIZE];
+ u8 auth_key[QCE_MAX_KEY_SIZE];
+ u8 ccm4309_salt[QCE_CCM4309_SALT_SIZE];
+ unsigned int enc_keylen;
+ unsigned int auth_keylen;
+ unsigned int authsize;
+};
+
+struct qce_aead_reqctx {
+ unsigned long flags;
+ u8 *iv;
+ unsigned int ivsize;
+ int src_nents;
+ int dst_nents;
+ struct scatterlist result_sg;
+ struct scatterlist adata_sg;
+ struct sg_table dst_tbl;
+ struct sg_table src_tbl;
+ struct scatterlist *dst_sg;
+ struct scatterlist *src_sg;
+ unsigned int cryptlen;
+ unsigned int assoclen;
+ unsigned char *adata;
+ u8 ccm_nonce[QCE_MAX_NONCE];
+ u8 ccmresult_buf[QCE_BAM_BURST_SIZE];
+ u8 ccm_rfc4309_iv[QCE_MAX_IV_SIZE];
+};
+
+static inline struct qce_alg_template *to_aead_tmpl(struct crypto_aead *tfm)
+{
+ struct aead_alg *alg = crypto_aead_alg(tfm);
+
+ return container_of(alg, struct qce_alg_template, alg.aead);
+}
+
+extern const struct qce_algo_ops aead_ops;
+
+#endif /* _AEAD_H_ */
diff --git a/drivers/crypto/qce/common.h b/drivers/crypto/qce/common.h
index b135440bf72b..02e63ad9f245 100644
--- a/drivers/crypto/qce/common.h
+++ b/drivers/crypto/qce/common.h
@@ -11,6 +11,7 @@
#include <crypto/aes.h>
#include <crypto/hash.h>
#include <crypto/internal/skcipher.h>
+#include <crypto/internal/aead.h>

/* xts du size */
#define QCE_SECTOR_SIZE 512
@@ -88,6 +89,7 @@ struct qce_alg_template {
union {
struct skcipher_alg skcipher;
struct ahash_alg ahash;
+ struct aead_alg aead;
} alg;
struct qce_device *qce;
const u8 *hash_zero;
diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
index 80b75085c265..d3780be44a76 100644
--- a/drivers/crypto/qce/core.c
+++ b/drivers/crypto/qce/core.c
@@ -17,6 +17,7 @@
#include "core.h"
#include "cipher.h"
#include "sha.h"
+#include "aead.h"

#define QCE_MAJOR_VERSION5 0x05
#define QCE_QUEUE_LENGTH 1
@@ -28,6 +29,9 @@ static const struct qce_algo_ops *qce_ops[] = {
#ifdef CONFIG_CRYPTO_DEV_QCE_SHA
&ahash_ops,
#endif
+#ifdef CONFIG_CRYPTO_DEV_QCE_AEAD
+ &aead_ops,
+#endif
};

static void qce_unregister_algs(struct qce_device *qce)
--
2.25.1
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  Last update: 2021-04-29 17:08    [W:0.116 / U:1.304 seconds]
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