AES-GCM is an AEAD algorithm supporting both encryption and
authentication of data. This patch introduces support for AES-GCM as the
first AEAD algorithm supported by the DTHEv2 driver.
Signed-off-by: T Pratham <t-pratham@xxxxxx>
---
drivers/crypto/ti/Kconfig | 2 +
drivers/crypto/ti/dthev2-aes.c | 601 +++++++++++++++++++++++++++++-
drivers/crypto/ti/dthev2-common.h | 6 +
3 files changed, 608 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/ti/Kconfig b/drivers/crypto/ti/Kconfig
index b36733a8c734..e1ef84b39267 100644
--- a/drivers/crypto/ti/Kconfig
+++ b/drivers/crypto/ti/Kconfig
@@ -8,6 +8,8 @@ config CRYPTO_DEV_TI_DTHEV2
select CRYPTO_CBC
select CRYPTO_CTR
select CRYPTO_XTS
+ select CRYPTO_GCM
+ select SG_SPLIT
help
This enables support for the TI DTHE V2 hw cryptography engine
which can be found on TI K3 SOCs. Selecting this enables use
diff --git a/drivers/crypto/ti/dthev2-aes.c b/drivers/crypto/ti/dthev2-aes.c
index 07787f0ae4fd..37bc43a1ba73 100644
--- a/drivers/crypto/ti/dthev2-aes.c
+++ b/drivers/crypto/ti/dthev2-aes.c
@@ -10,6 +10,7 @@
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/engine.h>
+#include <crypto/gcm.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
@@ -53,6 +54,7 @@
#define DTHE_P_AES_C_LENGTH_1 0x0058
#define DTHE_P_AES_AUTH_LENGTH 0x005C
#define DTHE_P_AES_DATA_IN_OUT 0x0060
+#define DTHE_P_AES_TAG_OUT 0x0070
#define DTHE_P_AES_SYSCONFIG 0x0084
#define DTHE_P_AES_IRQSTATUS 0x008C
@@ -65,6 +67,7 @@ enum aes_ctrl_mode_masks {
AES_CTRL_CBC_MASK = BIT(5),
AES_CTRL_CTR_MASK = BIT(6),
AES_CTRL_XTS_MASK = BIT(12) | BIT(11),
+ AES_CTRL_GCM_MASK = BIT(17) | BIT(16) | BIT(6),
};
#define DTHE_AES_CTRL_MODE_CLEAR_MASK ~GENMASK(28, 5)
@@ -91,6 +94,21 @@ enum aes_ctrl_mode_masks {
#define AES_IV_SIZE AES_BLOCK_SIZE
#define AES_BLOCK_WORDS (AES_BLOCK_SIZE / sizeof(u32))
#define AES_IV_WORDS AES_BLOCK_WORDS
+#define DTHE_AES_GCM_AAD_MAXLEN (BIT_ULL(32) - 1)
+#define POLL_TIMEOUT_INTERVAL HZ
+
+static int dthe_poll_reg(struct dthe_data *dev_data, u32 reg, u32 bit)
+{
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+ unsigned long timeout = jiffies + POLL_TIMEOUT_INTERVAL;
+
+ while (!(readl_relaxed(aes_base_reg + reg) & bit)) {
+ if (time_is_before_jiffies(timeout))
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
static int dthe_cipher_init_tfm(struct crypto_skcipher *tfm)
{
@@ -225,6 +243,9 @@ static void dthe_aes_set_ctrl_key(struct dthe_tfm_ctx *ctx,
case DTHE_AES_XTS:
ctrl_val |= AES_CTRL_XTS_MASK;
break;
+ case DTHE_AES_GCM:
+ ctrl_val |= AES_CTRL_GCM_MASK;
+ break;
}
if (iv_in) {
@@ -451,6 +472,550 @@ static int dthe_aes_decrypt(struct skcipher_request *req)
return dthe_aes_crypt(req);
}
+static int dthe_aead_init_tfm(struct crypto_aead *tfm)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(tfm);
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+
+ memzero_explicit(ctx, sizeof(*ctx));
+ ctx->dev_data = dev_data;
+
+ const char *alg_name = crypto_tfm_alg_name(&tfm->base);
+
+ ctx->aead_fb = crypto_alloc_aead(alg_name, 0,
+ CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(ctx->aead_fb)) {
+ dev_err(dev_data->dev, "fallback driver %s couldn't be loaded\n",
+ alg_name);
+ return PTR_ERR(ctx->aead_fb);
+ }
+
+ return 0;
+}
+
+static void dthe_aead_exit_tfm(struct crypto_aead *tfm)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(tfm);
+
+ crypto_free_aead(ctx->aead_fb);
+}
+
+/**
+ * dthe_aead_prep_src - Prepare source scatterlist for AEAD from input req->src
+ * @sg: Input req->src scatterlist
+ * @assoclen: Input req->assoclen
+ * @cryptlen: Input req->cryptlen (minus the size of TAG in decryption)
+ *
+ * Description:
+ * For modes with authentication, DTHEv2 hardware requires the input AAD and
+ * plaintext/ciphertext to be individually aligned to AES_BLOCK_SIZE. However,
+ * linux crypto's aead_request provides the input with AAD and plaintext/ciphertext
+ * contiguously in a single scatterlist.
+ *
+ * This helper function takes the input scatterlist and splits it into separate
+ * scatterlists for AAD and plaintext/ciphertext, ensuring each is aligned to
+ * AES_BLOCK_SIZE, and then merges the aligned scatterlists back into a single
+ * scatterlist for processing.
+ *
+ * Return:
+ * Pointer to the merged scatterlist, or NULL on failure.
+ **/
+static struct scatterlist *dthe_aead_prep_src(struct scatterlist *sg,
+ unsigned int assoclen,
+ unsigned int cryptlen)
+{
+ struct scatterlist *in_sg[2];
+ struct scatterlist *to_sg;
+ struct scatterlist *src, *ret;
+ size_t split_sizes[2] = {assoclen, cryptlen};
+ int out_mapped_nents[2];
+ int crypt_nents = 0, assoc_nents = 0, src_nents = 0;
+
+ /* sg_split does not work properly if one of the split_sizes is 0 */
+ if (cryptlen == 0 || assoclen == 0) {
+ /*
+ * Assigning both to sg does not matter as assoclen = 0 or cryptlen = 0
+ * being passed to dthe_copy_sg will take care to copy the sg correctly
+ */
+ in_sg[0] = sg;
+ in_sg[1] = sg;
+
+ src_nents = sg_nents_for_len(sg, assoclen + cryptlen);
+ } else {
+ sg_split(sg, 0, 0, 2, split_sizes, in_sg, out_mapped_nents, GFP_KERNEL);
+ assoc_nents = sg_nents_for_len(in_sg[0], assoclen);
+ crypt_nents = sg_nents_for_len(in_sg[1], cryptlen);
+
+ src_nents = assoc_nents + crypt_nents;
+ }
+
+ if (assoclen % AES_BLOCK_SIZE)
+ src_nents++;
+ if (cryptlen % AES_BLOCK_SIZE)
+ src_nents++;
+
+ src = kmalloc_array(src_nents, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!src) {
+ ret = NULL;
+ goto dthe_aead_prep_src_mem_err;
+ }
+
+ sg_init_table(src, src_nents);
+ to_sg = src;
+ ret = src;
+
+ to_sg = dthe_copy_sg(to_sg, in_sg[0], assoclen);
+ if (assoclen % AES_BLOCK_SIZE) {
+ unsigned int pad_len = AES_BLOCK_SIZE - (assoclen % AES_BLOCK_SIZE);
+ u8 *pad_buf = kzalloc(sizeof(u8) * pad_len, GFP_KERNEL);
+
+ if (!pad_buf) {
+ kfree(src);
+ ret = NULL;
+ goto dthe_aead_prep_src_mem_err;
+ }
+
+ sg_set_buf(to_sg, pad_buf, pad_len);
+ to_sg = sg_next(to_sg);
+ }
+
+ to_sg = dthe_copy_sg(to_sg, in_sg[1], cryptlen);
+ if (cryptlen % AES_BLOCK_SIZE) {
+ unsigned int pad_len = AES_BLOCK_SIZE - (cryptlen % AES_BLOCK_SIZE);
+ u8 *pad_buf = kzalloc(sizeof(u8) * pad_len, GFP_KERNEL);
+
+ if (!pad_buf) {
+ kfree(src);
+ ret = NULL;
+ goto dthe_aead_prep_src_mem_err;
+ }
+
+ sg_set_buf(to_sg, pad_buf, pad_len);
+ to_sg = sg_next(to_sg);
+ }
+
+dthe_aead_prep_src_mem_err:
+ if (cryptlen != 0 && assoclen != 0) {
+ kfree(in_sg[0]);
+ kfree(in_sg[1]);
+ }
+
+ return ret;
+}
+
+/**
+ * dthe_aead_prep_dst - Prepare destination scatterlist for AEAD from input req->dst
+ * @sg: Input req->dst scatterlist
+ * @assoclen: Input req->assoclen
+ * @cryptlen: Input req->cryptlen (minus the size of TAG in decryption)
+ *
+ * Description:
+ * For modes with authentication, DTHEv2 hardware returns encrypted ciphertext/decrypted
+ * plaintext through DMA and TAG through MMRs. However, the dst scatterlist in linux
+ * crypto's aead_request is allocated same as input req->src scatterlist. That is, it
+ * contains space for AAD in the beginning and ciphertext/plaintext at the end, with no
+ * alignment padding. This causes issues with DMA engine and DTHEv2 hardware.
+ *
+ * This helper function takes the output scatterlist and maps the part of the buffer
+ * which holds only the ciphertext/plaintext to a new scatterlist. It also adds a padding
+ * to align it with AES_BLOCK_SIZE.
+ *
+ * Return:
+ * Pointer to the trimmed scatterlist, or NULL on failure.
+ **/
+static struct scatterlist *dthe_aead_prep_dst(struct scatterlist *sg,
+ unsigned int assoclen,
+ unsigned int cryptlen)
+{
+ struct scatterlist *out_sg[1];
+ struct scatterlist *dst;
+ struct scatterlist *to_sg;
+ size_t split_sizes[1] = {cryptlen};
+ int out_mapped_nents[1];
+ int dst_nents = 0;
+
+ sg_split(sg, 0, assoclen, 1, split_sizes, out_sg, out_mapped_nents, GFP_KERNEL);
+ dst_nents = sg_nents_for_len(out_sg[0], cryptlen);
+ if (cryptlen % AES_BLOCK_SIZE)
+ dst_nents++;
+
+ dst = kmalloc_array(dst_nents, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!dst) {
+ kfree(out_sg[0]);
+ return NULL;
+ }
+ sg_init_table(dst, dst_nents);
+
+ to_sg = dthe_copy_sg(dst, out_sg[0], cryptlen);
+ if (cryptlen % AES_BLOCK_SIZE) {
+ unsigned int pad_len = AES_BLOCK_SIZE - (cryptlen % AES_BLOCK_SIZE);
+ u8 *pad_buf = kzalloc(sizeof(u8) * pad_len, GFP_KERNEL);
+
+ if (!pad_buf) {
+ kfree(dst);
+ kfree(out_sg[0]);
+ return NULL;
+ }
+
+ sg_set_buf(to_sg, pad_buf, pad_len);
+ to_sg = sg_next(to_sg);
+ }
+
+ kfree(out_sg[0]);
+
+ return dst;
+}
+
+static int dthe_aead_read_tag(struct dthe_tfm_ctx *ctx, u32 *tag)
+{
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+ int ret;
+
+ ret = dthe_poll_reg(dev_data, DTHE_P_AES_CTRL, DTHE_AES_CTRL_SAVED_CTX_READY);
+ if (ret)
+ return ret;
+
+ for (int i = 0; i < AES_BLOCK_WORDS; ++i)
+ tag[i] = readl_relaxed(aes_base_reg +
+ DTHE_P_AES_TAG_OUT +
+ DTHE_REG_SIZE * i);
+ return 0;
+}
+
+static int dthe_aead_enc_get_tag(struct aead_request *req)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ u32 tag[AES_BLOCK_WORDS];
+ int nents;
+ int ret;
+
+ ret = dthe_aead_read_tag(ctx, tag);
+ if (ret)
+ return ret;
+
+ nents = sg_nents_for_len(req->dst, req->cryptlen + req->assoclen + ctx->authsize);
+
+ sg_pcopy_from_buffer(req->dst, nents, tag, ctx->authsize,
+ req->assoclen + req->cryptlen);
+
+ return 0;
+}
+
+static int dthe_aead_dec_verify_tag(struct aead_request *req)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ u32 tag_out[AES_BLOCK_WORDS];
+ u32 tag_in[AES_BLOCK_WORDS];
+ int nents;
+ int ret;
+
+ ret = dthe_aead_read_tag(ctx, tag_out);
+ if (ret)
+ return ret;
+
+ nents = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
+
+ sg_pcopy_to_buffer(req->src, nents, tag_in, ctx->authsize,
+ req->assoclen + req->cryptlen - ctx->authsize);
+
+ if (memcmp(tag_in, tag_out, ctx->authsize))
+ return -EBADMSG;
+ else
+ return 0;
+}
+
+static int dthe_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ ctx->aes_mode = DTHE_AES_GCM;
+ ctx->keylen = keylen;
+ memcpy(ctx->key, key, keylen);
+
+ crypto_aead_clear_flags(ctx->aead_fb, CRYPTO_TFM_REQ_MASK);
+ crypto_aead_set_flags(ctx->aead_fb,
+ crypto_aead_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+
+ return crypto_aead_setkey(ctx->aead_fb, key, keylen);
+}
+
+static int dthe_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(tfm);
+
+ /* Invalid auth size will be handled by crypto_aead_setauthsize() */
+ ctx->authsize = authsize;
+
+ return crypto_aead_setauthsize(ctx->aead_fb, authsize);
+}
+
+static void dthe_aead_dma_in_callback(void *data)
+{
+ struct aead_request *req = (struct aead_request *)data;
+ struct dthe_aes_req_ctx *rctx = aead_request_ctx(req);
+
+ complete(&rctx->aes_compl);
+}
+
+static int dthe_aead_run(struct crypto_engine *engine, void *areq)
+{
+ struct aead_request *req = container_of(areq, struct aead_request, base);
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct dthe_aes_req_ctx *rctx = aead_request_ctx(req);
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+
+ unsigned int cryptlen = req->cryptlen;
+ unsigned int assoclen = req->assoclen;
+ unsigned int authsize = ctx->authsize;
+ unsigned int unpadded_cryptlen;
+ struct scatterlist *src = req->src;
+ struct scatterlist *dst = req->dst;
+
+ int src_nents;
+ int dst_nents;
+ int src_mapped_nents, dst_mapped_nents;
+
+ enum dma_data_direction src_dir, dst_dir;
+
+ struct device *tx_dev, *rx_dev;
+ struct dma_async_tx_descriptor *desc_in, *desc_out;
+
+ int ret;
+
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+
+ u32 aes_irqenable_val = readl_relaxed(aes_base_reg + DTHE_P_AES_IRQENABLE);
+ u32 aes_sysconfig_val = readl_relaxed(aes_base_reg + DTHE_P_AES_SYSCONFIG);
+
+ aes_sysconfig_val |= DTHE_AES_SYSCONFIG_DMA_DATA_IN_OUT_EN;
+ writel_relaxed(aes_sysconfig_val, aes_base_reg + DTHE_P_AES_SYSCONFIG);
+
+ aes_irqenable_val |= DTHE_AES_IRQENABLE_EN_ALL;
+ writel_relaxed(aes_irqenable_val, aes_base_reg + DTHE_P_AES_IRQENABLE);
+
+ /* In decryption, the last authsize bytes are the TAG */
+ if (!rctx->enc)
+ cryptlen -= authsize;
+ unpadded_cryptlen = cryptlen;
+
+ /* Prep src and dst scatterlists */
+ src = dthe_aead_prep_src(req->src, req->assoclen, cryptlen);
+ if (!src) {
+ ret = -ENOMEM;
+ goto aead_err;
+ }
+
+ if (cryptlen != 0) {
+ dst = dthe_aead_prep_dst(req->dst, req->assoclen, cryptlen);
+ if (!dst) {
+ ret = -ENOMEM;
+ goto aead_prep_dst_err;
+ }
+ }
+
+ if (req->assoclen % AES_BLOCK_SIZE)
+ assoclen += AES_BLOCK_SIZE - (req->assoclen % AES_BLOCK_SIZE);
+ if (cryptlen % AES_BLOCK_SIZE)
+ cryptlen += AES_BLOCK_SIZE - (cryptlen % AES_BLOCK_SIZE);
+
+ src_nents = sg_nents_for_len(src, assoclen + cryptlen);
+ dst_nents = sg_nents_for_len(dst, cryptlen);
+ /* Prep finished */
+
+ src_dir = DMA_TO_DEVICE;
+ dst_dir = DMA_FROM_DEVICE;
+
+ tx_dev = dmaengine_get_dma_device(dev_data->dma_aes_tx);
+ rx_dev = dmaengine_get_dma_device(dev_data->dma_aes_rx);
+
+ src_mapped_nents = dma_map_sg(tx_dev, src, src_nents, src_dir);
+ if (src_mapped_nents == 0) {
+ ret = -EINVAL;
+ goto aead_dma_map_src_err;
+ }
+
+ desc_out = dmaengine_prep_slave_sg(dev_data->dma_aes_tx, src, src_mapped_nents,
+ DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_out) {
+ ret = -EINVAL;
+ goto aead_dma_prep_src_err;
+ }
+
+ desc_out->callback = dthe_aead_dma_in_callback;
+ desc_out->callback_param = req;
+
+ if (cryptlen != 0) {
+ dst_mapped_nents = dma_map_sg(rx_dev, dst, dst_nents, dst_dir);
+ if (dst_mapped_nents == 0) {
+ ret = -EINVAL;
+ goto aead_dma_prep_src_err;
+ }
+
+ desc_in = dmaengine_prep_slave_sg(dev_data->dma_aes_rx, dst,
+ dst_mapped_nents, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_in) {
+ ret = -EINVAL;
+ goto aead_dma_prep_dst_err;
+ }
+ }
+
+ init_completion(&rctx->aes_compl);
+
+ /*
+ * HACK: There is an unknown hw issue where if the previous operation had alen = 0 and
+ * plen != 0, the current operation's tag calculation is incorrect in the case where
+ * plen = 0 and alen != 0 currently. This is a workaround for now which somwhow works;
+ * by resetting the context by writing a 1 to the C_LENGTH_0 and AUTH_LENGTH registers.
+ */
+ if (cryptlen == 0) {
+ writel_relaxed(1, aes_base_reg + DTHE_P_AES_C_LENGTH_0);
+ writel_relaxed(1, aes_base_reg + DTHE_P_AES_AUTH_LENGTH);
+ }
+
+ u32 iv_in[AES_IV_WORDS];
+
+ if (req->iv) {
+ memcpy(iv_in, req->iv, GCM_AES_IV_SIZE);
+ } else {
+ iv_in[0] = 0;
+ iv_in[1] = 0;
+ iv_in[2] = 0;
+ }
+ iv_in[3] = 0x01000000;
+
+ /* Clear key2 to reset previous GHASH intermediate data */
+ for (int i = 0; i < AES_KEYSIZE_256 / sizeof(u32); ++i)
+ writel_relaxed(0, aes_base_reg + DTHE_P_AES_KEY2_6 + DTHE_REG_SIZE * i);
+
+ dthe_aes_set_ctrl_key(ctx, rctx, iv_in);
+
+ writel_relaxed(lower_32_bits(unpadded_cryptlen), aes_base_reg + DTHE_P_AES_C_LENGTH_0);
+ writel_relaxed(upper_32_bits(unpadded_cryptlen), aes_base_reg + DTHE_P_AES_C_LENGTH_1);
+ writel_relaxed(req->assoclen, aes_base_reg + DTHE_P_AES_AUTH_LENGTH);
+
+ if (cryptlen != 0)
+ dmaengine_submit(desc_in);
+ dmaengine_submit(desc_out);
+
+ if (cryptlen != 0)
+ dma_async_issue_pending(dev_data->dma_aes_rx);
+ dma_async_issue_pending(dev_data->dma_aes_tx);
+
+ /* Need to do timeout to ensure finalise gets called if DMA callback fails for any reason */
+ ret = wait_for_completion_timeout(&rctx->aes_compl, msecs_to_jiffies(DTHE_DMA_TIMEOUT_MS));
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ if (cryptlen != 0)
+ dmaengine_terminate_sync(dev_data->dma_aes_rx);
+ dmaengine_terminate_sync(dev_data->dma_aes_tx);
+
+ for (int i = 0; i < AES_BLOCK_SIZE / sizeof(int); ++i)
+ readl_relaxed(aes_base_reg + DTHE_P_AES_DATA_IN_OUT + DTHE_REG_SIZE * i);
+ } else {
+ ret = 0;
+ }
+
+ if (cryptlen != 0)
+ dma_sync_sg_for_cpu(rx_dev, dst, dst_nents, dst_dir);
+ if (rctx->enc)
+ ret = dthe_aead_enc_get_tag(req);
+ else
+ ret = dthe_aead_dec_verify_tag(req);
+
+aead_dma_prep_dst_err:
+ if (cryptlen != 0)
+ dma_unmap_sg(rx_dev, dst, dst_nents, dst_dir);
+aead_dma_prep_src_err:
+ dma_unmap_sg(tx_dev, src, src_nents, src_dir);
+
+aead_dma_map_src_err:
+ if (unpadded_cryptlen % AES_BLOCK_SIZE && cryptlen != 0)
+ kfree(sg_virt(&dst[dst_nents - 1]));
+
+ if (cryptlen != 0)
+ kfree(dst);
+
+aead_prep_dst_err:
+ if (req->assoclen % AES_BLOCK_SIZE) {
+ int assoc_nents = sg_nents_for_len(src, req->assoclen);
+
+ kfree(sg_virt(&src[assoc_nents]));
+ }
+ if (unpadded_cryptlen % AES_BLOCK_SIZE)
+ kfree(sg_virt(&src[src_nents - 1]));
+
+ kfree(src);
+
+aead_err:
+ local_bh_disable();
+ crypto_finalize_aead_request(dev_data->engine, req, ret);
+ local_bh_enable();
+ return ret;
+}
+
+static int dthe_aead_crypt(struct aead_request *req)
+{
+ struct dthe_tfm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct dthe_aes_req_ctx *rctx = aead_request_ctx(req);
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+ struct crypto_engine *engine;
+ unsigned int cryptlen = req->cryptlen;
+
+ /* In decryption, last authsize bytes are the TAG */
+ if (!rctx->enc)
+ cryptlen -= ctx->authsize;
+
+ /*
+ * Need to fallback to software in the following cases due to HW restrictions:
+ * - Both AAD and plaintext/ciphertext are zero length
+ * - AAD length is more than 2^32 - 1 bytes
+ * PS: req->cryptlen is currently unsigned int type, which causes the above condition
+ * tautologically false. If req->cryptlen were to be changed to a 64-bit type,
+ * the check for this would need to be added below.
+ */
+ if (req->assoclen == 0 && cryptlen == 0) {
+ struct aead_request *subreq = &rctx->fb_req;
+ int ret;
+
+ aead_request_set_tfm(subreq, ctx->aead_fb);
+ aead_request_set_callback(subreq, req->base.flags,
+ req->base.complete, req->base.data);
+ aead_request_set_crypt(subreq, req->src, req->dst,
+ req->cryptlen, req->iv);
+ aead_request_set_ad(subreq, req->assoclen);
+
+ ret = rctx->enc ? crypto_aead_encrypt(subreq) :
+ crypto_aead_decrypt(subreq);
+
+ return ret;
+ }
+
+ engine = dev_data->engine;
+ return crypto_transfer_aead_request_to_engine(engine, req);
+}
+
+static int dthe_aead_encrypt(struct aead_request *req)
+{
+ struct dthe_aes_req_ctx *rctx = aead_request_ctx(req);
+
+ rctx->enc = 1;
+ return dthe_aead_crypt(req);
+}
+
+static int dthe_aead_decrypt(struct aead_request *req)
+{
+ struct dthe_aes_req_ctx *rctx = aead_request_ctx(req);
+
+ rctx->enc = 0;
+ return dthe_aead_crypt(req);
+}
+
static struct skcipher_engine_alg cipher_algs[] = {
{
.base.init = dthe_cipher_init_tfm,
@@ -541,12 +1106,46 @@ static struct skcipher_engine_alg cipher_algs[] = {
}, /* XTS AES */
};
+static struct aead_engine_alg aead_algs[] = {
+ {
+ .base.init = dthe_aead_init_tfm,
+ .base.exit = dthe_aead_exit_tfm,
+ .base.setkey = dthe_aead_setkey,
+ .base.setauthsize = dthe_aead_setauthsize,
+ .base.maxauthsize = AES_BLOCK_SIZE,
+ .base.encrypt = dthe_aead_encrypt,
+ .base.decrypt = dthe_aead_decrypt,
+ .base.chunksize = AES_BLOCK_SIZE,
+ .base.ivsize = GCM_AES_IV_SIZE,
+ .base.base = {
+ .cra_name = "gcm(aes)",
+ .cra_driver_name = "gcm-aes-dthev2",
+ .cra_priority = 299,
+ .cra_flags = CRYPTO_ALG_TYPE_AEAD |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct dthe_tfm_ctx),
+ .cra_reqsize = sizeof(struct dthe_aes_req_ctx),
+ .cra_module = THIS_MODULE,
+ },
+ .op.do_one_request = dthe_aead_run,
+ }, /* GCM AES */
+};
+
int dthe_register_aes_algs(void)
{
- return crypto_engine_register_skciphers(cipher_algs, ARRAY_SIZE(cipher_algs));
+ int ret = 0;
+
+ ret |= crypto_engine_register_skciphers(cipher_algs, ARRAY_SIZE(cipher_algs));
+ ret |= crypto_engine_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
+
+ return ret;
}
void dthe_unregister_aes_algs(void)
{
crypto_engine_unregister_skciphers(cipher_algs, ARRAY_SIZE(cipher_algs));
+ crypto_engine_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
}
diff --git a/drivers/crypto/ti/dthev2-common.h b/drivers/crypto/ti/dthev2-common.h
index 629f45a3ab33..3c9fe0633cca 100644
--- a/drivers/crypto/ti/dthev2-common.h
+++ b/drivers/crypto/ti/dthev2-common.h
@@ -38,6 +38,7 @@ enum dthe_aes_mode {
DTHE_AES_CBC,
DTHE_AES_CTR,
DTHE_AES_XTS,
+ DTHE_AES_GCM,
};
/* Driver specific struct definitions */
@@ -78,14 +79,18 @@ struct dthe_list {
* struct dthe_tfm_ctx - Transform ctx struct containing ctx for all sub-components of DTHE V2
* @dev_data: Device data struct pointer
* @keylen: AES key length
+ * @authsize: Authentication size for modes with authentication
* @key: AES key
* @aes_mode: AES mode
+ * @aead_fb: Fallback crypto aead instance for GCM mode
*/
struct dthe_tfm_ctx {
struct dthe_data *dev_data;
unsigned int keylen;
+ unsigned int authsize;
u32 key[DTHE_MAX_KEYSIZE / sizeof(u32)];
enum dthe_aes_mode aes_mode;
+ struct crypto_aead *aead_fb;
};
/**
@@ -96,6 +101,7 @@ struct dthe_tfm_ctx {
struct dthe_aes_req_ctx {
int enc;
struct completion aes_compl;
+ struct aead_request fb_req;
};
/* Struct definitions end */
--
2.43.0
