Add AEAD cipher algorithms for aes gcm and ccm.
Signed-off-by: Fabien Dessenne <fabien.desse...@st.com>
---
drivers/crypto/stm32/stm32-cryp.c | 931 ++++++++++++++++++++++++++++++++++++--
1 file changed, 902 insertions(+), 29 deletions(-)
diff --git a/drivers/crypto/stm32/stm32-cryp.c
b/drivers/crypto/stm32/stm32-cryp.c
index 0f0e2ba..6a1fe98 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -17,6 +17,7 @@
#include <crypto/des.h>
#include <crypto/engine.h>
#include <crypto/scatterwalk.h>
+#include <crypto/internal/aead.h>
#define DRIVER_NAME "stm32-cryp"
@@ -29,8 +30,12 @@
#define FLG_ECB BIT(4)
#define FLG_CBC BIT(5)
#define FLG_CTR BIT(6)
+#define FLG_GCM BIT(7)
+#define FLG_CCM BIT(8)
/* Mode mask = bits [15..0] */
#define FLG_MODE_MASK GENMASK(15, 0)
+/* Bit [31..16] status */
+#define FLG_CCM_PADDED_WA BIT(16)
/* Registers */
#define CRYP_CR 0x00000000
@@ -53,6 +58,8 @@
#define CRYP_IV0RR 0x00000044
#define CRYP_IV1LR 0x00000048
#define CRYP_IV1RR 0x0000004C
+#define CRYP_CSGCMCCM0R 0x00000050
+#define CRYP_CSGCM0R 0x00000070
/* Registers values */
#define CR_DEC_NOT_ENC 0x00000004
@@ -64,6 +71,8 @@
#define CR_AES_CBC 0x00000028
#define CR_AES_CTR 0x00000030
#define CR_AES_KP 0x00000038
+#define CR_AES_GCM 0x00080000
+#define CR_AES_CCM 0x00080008
#define CR_AES_UNKNOWN 0xFFFFFFFF
#define CR_ALGO_MASK 0x00080038
#define CR_DATA32 0x00000000
@@ -75,6 +84,12 @@
#define CR_KEY256 0x00000200
#define CR_FFLUSH 0x00004000
#define CR_CRYPEN 0x00008000
+#define CR_PH_INIT 0x00000000
+#define CR_PH_HEADER 0x00010000
+#define CR_PH_PAYLOAD 0x00020000
+#define CR_PH_FINAL 0x00030000
+#define CR_PH_MASK 0x00030000
+#define CR_NBPBL_SHIFT 20
#define SR_BUSY 0x00000010
#define SR_OFNE 0x00000004
@@ -87,9 +102,15 @@
/* Misc */
#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32))
+#define GCM_CTR_INIT 2
#define _walked_in (cryp->in_walk.offset - cryp->in_sg->offset)
#define _walked_out (cryp->out_walk.offset - cryp->out_sg->offset)
+struct stm32_cryp_caps {
+ bool swap_final;
+ bool padding_wa;
+};
+
struct stm32_cryp_ctx {
struct crypto_engine_ctx enginectx;
struct stm32_cryp *cryp;
@@ -109,13 +130,16 @@ struct stm32_cryp {
struct clk *clk;
unsigned long flags;
u32 irq_status;
+ const struct stm32_cryp_caps *caps;
struct stm32_cryp_ctx *ctx;
struct crypto_engine *engine;
- struct mutex lock; /* protects req */
+ struct mutex lock; /* protects req / areq */
struct ablkcipher_request *req;
+ struct aead_request *areq;
+ size_t authsize;
size_t hw_blocksize;
size_t total_in;
@@ -138,6 +162,7 @@ struct stm32_cryp {
struct scatter_walk out_walk;
u32 last_ctr[4];
+ u32 gcm_ctr;
};
struct stm32_cryp_list {
@@ -180,6 +205,16 @@ static inline bool is_ctr(struct stm32_cryp *cryp)
return cryp->flags & FLG_CTR;
}
+static inline bool is_gcm(struct stm32_cryp *cryp)
+{
+ return cryp->flags & FLG_GCM;
+}
+
+static inline bool is_ccm(struct stm32_cryp *cryp)
+{
+ return cryp->flags & FLG_CCM;
+}
+
static inline bool is_encrypt(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_ENCRYPT;
@@ -208,6 +243,24 @@ static inline int stm32_cryp_wait_busy(struct stm32_cryp
*cryp)
!(status & SR_BUSY), 10, 100000);
}
+static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp)
+{
+ u32 status;
+
+ return readl_relaxed_poll_timeout(cryp->regs + CRYP_CR, status,
+ !(status & CR_CRYPEN), 10, 100000);
+}
+
+static inline int stm32_cryp_wait_output(struct stm32_cryp *cryp)
+{
+ u32 status;
+
+ return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
+ status & SR_OFNE, 10, 100000);
+}
+
+static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp);
+
static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx)
{
struct stm32_cryp *tmp, *cryp = NULL;
@@ -366,6 +419,12 @@ static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
if (is_aes(cryp) && is_ctr(cryp))
return CR_AES_CTR;
+ if (is_aes(cryp) && is_gcm(cryp))
+ return CR_AES_GCM;
+
+ if (is_aes(cryp) && is_ccm(cryp))
+ return CR_AES_CCM;
+
if (is_des(cryp) && is_ecb(cryp))
return CR_DES_ECB;
@@ -382,6 +441,79 @@ static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
return CR_AES_UNKNOWN;
}
+static unsigned int stm32_cryp_get_input_text_len(struct stm32_cryp *cryp)
+{
+ return is_encrypt(cryp) ? cryp->areq->cryptlen :
+ cryp->areq->cryptlen - cryp->authsize;
+}
+
+static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg)
+{
+ int ret;
+ u32 iv[4];
+
+ /* Phase 1 : init */
+ memcpy(iv, cryp->areq->iv, 12);
+ iv[3] = cpu_to_be32(GCM_CTR_INIT);
+ cryp->gcm_ctr = GCM_CTR_INIT;
+ stm32_cryp_hw_write_iv(cryp, iv);
+
+ stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
+
+ /* Wait for end of processing */
+ ret = stm32_cryp_wait_enable(cryp);
+ if (ret)
+ dev_err(cryp->dev, "Timeout (gcm init)\n");
+
+ return ret;
+}
+
+static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
+{
+ int ret;
+ u8 iv[AES_BLOCK_SIZE], b0[AES_BLOCK_SIZE];
+ u32 *d;
+ unsigned int i, textlen;
+
+ /* Phase 1 : init. Firstly set the CTR value to 1 (not 0) */
+ memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
+ memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
+ iv[AES_BLOCK_SIZE - 1] = 1;
+ stm32_cryp_hw_write_iv(cryp, (u32 *)iv);
+
+ /* Build B0 */
+ memcpy(b0, iv, AES_BLOCK_SIZE);
+
+ b0[0] |= (8 * ((cryp->authsize - 2) / 2));
+
+ if (cryp->areq->assoclen)
+ b0[0] |= 0x40;
+
+ textlen = stm32_cryp_get_input_text_len(cryp);
+
+ b0[AES_BLOCK_SIZE - 2] = textlen >> 8;
+ b0[AES_BLOCK_SIZE - 1] = textlen & 0xFF;
+
+ /* Enable HW */
+ stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
+
+ /* Write B0 */
+ d = (u32 *)b0;
+
+ for (i = 0; i < AES_BLOCK_32; i++) {
+ if (!cryp->caps->padding_wa)
+ *d = cpu_to_be32(*d);
+ stm32_cryp_write(cryp, CRYP_DIN, *d++);
+ }
+
+ /* Wait for end of processing */
+ ret = stm32_cryp_wait_enable(cryp);
+ if (ret)
+ dev_err(cryp->dev, "Timeout (ccm init)\n");
+
+ return ret;
+}
+
static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
{
int ret;
@@ -437,6 +569,29 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
stm32_cryp_write(cryp, CRYP_CR, cfg);
switch (hw_mode) {
+ case CR_AES_GCM:
+ case CR_AES_CCM:
+ /* Phase 1 : init */
+ if (hw_mode == CR_AES_CCM)
+ ret = stm32_cryp_ccm_init(cryp, cfg);
+ else
+ ret = stm32_cryp_gcm_init(cryp, cfg);
+
+ if (ret)
+ return ret;
+
+ /* Phase 2 : header (authenticated data) */
+ if (cryp->areq->assoclen) {
+ cfg |= CR_PH_HEADER;
+ } else if (stm32_cryp_get_input_text_len(cryp)) {
+ cfg |= CR_PH_PAYLOAD;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+ } else {
+ cfg |= CR_PH_INIT;
+ }
+
+ break;
+
case CR_DES_CBC:
case CR_TDES_CBC:
case CR_AES_CBC:
@@ -453,12 +608,16 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
stm32_cryp_write(cryp, CRYP_CR, cfg);
+ cryp->flags &= ~FLG_CCM_PADDED_WA;
+
return 0;
}
-static void stm32_cryp_finish_req(struct stm32_cryp *cryp)
+static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
{
- int err = 0;
+ if (!err && (is_gcm(cryp) || is_ccm(cryp)))
+ /* Phase 4 : output tag */
+ err = stm32_cryp_read_auth_tag(cryp);
if (cryp->sgs_copied) {
void *buf_in, *buf_out;
@@ -479,8 +638,14 @@ static void stm32_cryp_finish_req(struct stm32_cryp *cryp)
free_pages((unsigned long)buf_out, pages);
}
- crypto_finalize_ablkcipher_request(cryp->engine, cryp->req, err);
- cryp->req = NULL;
+ if (is_gcm(cryp) || is_ccm(cryp)) {
+ crypto_finalize_aead_request(cryp->engine, cryp->areq, err);
+ cryp->areq = NULL;
+ } else {
+ crypto_finalize_ablkcipher_request(cryp->engine, cryp->req,
+ err);
+ cryp->req = NULL;
+ }
memset(cryp->ctx->key, 0, cryp->ctx->keylen);
@@ -511,6 +676,23 @@ static int stm32_cryp_cra_init(struct crypto_tfm *tfm)
return 0;
}
+static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq);
+static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine,
+ void *areq);
+
+static int stm32_cryp_aes_aead_init(struct crypto_aead *tfm)
+{
+ struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
+
+ tfm->reqsize = sizeof(struct stm32_cryp_reqctx);
+
+ ctx->enginectx.op.do_one_request = stm32_cryp_aead_one_req;
+ ctx->enginectx.op.prepare_request = stm32_cryp_prepare_aead_req;
+ ctx->enginectx.op.unprepare_request = NULL;
+
+ return 0;
+}
+
static int stm32_cryp_crypt(struct ablkcipher_request *req, unsigned long mode)
{
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(
@@ -526,6 +708,20 @@ static int stm32_cryp_crypt(struct ablkcipher_request
*req, unsigned long mode)
return crypto_transfer_ablkcipher_request_to_engine(cryp->engine, req);
}
+static int stm32_cryp_aead_crypt(struct aead_request *req, unsigned long mode)
+{
+ struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct stm32_cryp_reqctx *rctx = aead_request_ctx(req);
+ struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
+
+ if (!cryp)
+ return -ENODEV;
+
+ rctx->mode = mode;
+
+ return crypto_transfer_aead_request_to_engine(cryp->engine, req);
+}
+
static int stm32_cryp_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
@@ -565,6 +761,46 @@ static int stm32_cryp_tdes_setkey(struct crypto_ablkcipher
*tfm, const u8 *key,
return stm32_cryp_setkey(tfm, key, keylen);
}
+static int stm32_cryp_aes_aead_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
+ keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ memcpy(ctx->key, key, keylen);
+ ctx->keylen = keylen;
+
+ return 0;
+}
+
+static int stm32_cryp_aes_gcm_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ return authsize == AES_BLOCK_SIZE ? 0 : -EINVAL;
+}
+
+static int stm32_cryp_aes_ccm_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ switch (authsize) {
+ case 4:
+ case 6:
+ case 8:
+ case 10:
+ case 12:
+ case 14:
+ case 16:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int stm32_cryp_aes_ecb_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT);
@@ -595,6 +831,26 @@ static int stm32_cryp_aes_ctr_decrypt(struct
ablkcipher_request *req)
return stm32_cryp_crypt(req, FLG_AES | FLG_CTR);
}
+static int stm32_cryp_aes_gcm_encrypt(struct aead_request *req)
+{
+ return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM | FLG_ENCRYPT);
+}
+
+static int stm32_cryp_aes_gcm_decrypt(struct aead_request *req)
+{
+ return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM);
+}
+
+static int stm32_cryp_aes_ccm_encrypt(struct aead_request *req)
+{
+ return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM | FLG_ENCRYPT);
+}
+
+static int stm32_cryp_aes_ccm_decrypt(struct aead_request *req)
+{
+ return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM);
+}
+
static int stm32_cryp_des_ecb_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT);
@@ -635,18 +891,19 @@ static int stm32_cryp_tdes_cbc_decrypt(struct
ablkcipher_request *req)
return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC);
}
-static int stm32_cryp_prepare_req(struct crypto_engine *engine,
- struct ablkcipher_request *req)
+static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
+ struct aead_request *areq)
{
struct stm32_cryp_ctx *ctx;
struct stm32_cryp *cryp;
struct stm32_cryp_reqctx *rctx;
int ret;
- if (!req)
+ if (!req && !areq)
return -EINVAL;
- ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
+ ctx = req ? crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)) :
+ crypto_aead_ctx(crypto_aead_reqtfm(areq));
cryp = ctx->cryp;
@@ -655,7 +912,7 @@ static int stm32_cryp_prepare_req(struct crypto_engine
*engine,
mutex_lock(&cryp->lock);
- rctx = ablkcipher_request_ctx(req);
+ rctx = req ? ablkcipher_request_ctx(req) : aead_request_ctx(areq);
rctx->mode &= FLG_MODE_MASK;
ctx->cryp = cryp;
@@ -664,15 +921,48 @@ static int stm32_cryp_prepare_req(struct crypto_engine
*engine,
cryp->hw_blocksize = is_aes(cryp) ? AES_BLOCK_SIZE : DES_BLOCK_SIZE;
cryp->ctx = ctx;
- cryp->req = req;
- cryp->total_in = req->nbytes;
- cryp->total_out = cryp->total_in;
+ if (req) {
+ cryp->req = req;
+ cryp->total_in = req->nbytes;
+ cryp->total_out = cryp->total_in;
+ } else {
+ /*
+ * Length of input and output data:
+ * Encryption case:
+ * INPUT = AssocData || PlainText
+ * <- assoclen -> <- cryptlen ->
+ * <------- total_in ----------->
+ *
+ * OUTPUT = AssocData || CipherText || AuthTag
+ * <- assoclen -> <- cryptlen -> <- authsize ->
+ * <---------------- total_out ----------------->
+ *
+ * Decryption case:
+ * INPUT = AssocData || CipherText || AuthTag
+ * <- assoclen -> <--------- cryptlen --------->
+ * <- authsize ->
+ * <---------------- total_in ------------------>
+ *
+ * OUTPUT = AssocData || PlainText
+ * <- assoclen -> <- crypten - authsize ->
+ * <---------- total_out ----------------->
+ */
+ cryp->areq = areq;
+ cryp->authsize = crypto_aead_authsize(crypto_aead_reqtfm(areq));
+ cryp->total_in = areq->assoclen + areq->cryptlen;
+ if (is_encrypt(cryp))
+ /* Append auth tag to output */
+ cryp->total_out = cryp->total_in + cryp->authsize;
+ else
+ /* No auth tag in output */
+ cryp->total_out = cryp->total_in - cryp->authsize;
+ }
cryp->total_in_save = cryp->total_in;
cryp->total_out_save = cryp->total_out;
- cryp->in_sg = req->src;
- cryp->out_sg = req->dst;
+ cryp->in_sg = req ? req->src : areq->src;
+ cryp->out_sg = req ? req->dst : areq->dst;
cryp->out_sg_save = cryp->out_sg;
cryp->in_sg_len = sg_nents_for_len(cryp->in_sg, cryp->total_in);
@@ -696,6 +986,12 @@ static int stm32_cryp_prepare_req(struct crypto_engine
*engine,
scatterwalk_start(&cryp->in_walk, cryp->in_sg);
scatterwalk_start(&cryp->out_walk, cryp->out_sg);
+ if (is_gcm(cryp) || is_ccm(cryp)) {
+ /* In output, jump after assoc data */
+ scatterwalk_advance(&cryp->out_walk, cryp->areq->assoclen);
+ cryp->total_out -= cryp->areq->assoclen;
+ }
+
ret = stm32_cryp_hw_init(cryp);
out:
if (ret)
@@ -711,7 +1007,7 @@ static int stm32_cryp_prepare_cipher_req(struct
crypto_engine *engine,
struct ablkcipher_request,
base);
- return stm32_cryp_prepare_req(engine, req);
+ return stm32_cryp_prepare_req(req, NULL);
}
static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq)
@@ -729,6 +1025,34 @@ static int stm32_cryp_cipher_one_req(struct crypto_engine
*engine, void *areq)
return stm32_cryp_cpu_start(cryp);
}
+static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine, void
*areq)
+{
+ struct aead_request *req = container_of(areq, struct aead_request,
+ base);
+
+ return stm32_cryp_prepare_req(NULL, req);
+}
+
+static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq)
+{
+ struct aead_request *req = container_of(areq, struct aead_request,
+ base);
+ struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct stm32_cryp *cryp = ctx->cryp;
+
+ if (!cryp)
+ return -ENODEV;
+
+ if (unlikely(!cryp->areq->assoclen &&
+ !stm32_cryp_get_input_text_len(cryp))) {
+ /* No input data to process: get tag and finish */
+ stm32_cryp_finish_req(cryp, 0);
+ return 0;
+ }
+
+ return stm32_cryp_cpu_start(cryp);
+}
+
static u32 *stm32_cryp_next_out(struct stm32_cryp *cryp, u32 *dst,
unsigned int n)
{
@@ -761,6 +1085,111 @@ static u32 *stm32_cryp_next_in(struct stm32_cryp *cryp,
u32 *src,
return (u32 *)((u8 *)src + n);
}
+static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
+{
+ u32 cfg, size_bit, *dst, d32;
+ u8 *d8;
+ unsigned int i, j;
+ int ret = 0;
+
+ /* Update Config */
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+
+ cfg &= ~CR_PH_MASK;
+ cfg |= CR_PH_FINAL;
+ cfg &= ~CR_DEC_NOT_ENC;
+ cfg |= CR_CRYPEN;
+
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ if (is_gcm(cryp)) {
+ /* GCM: write aad and payload size (in bits) */
+ size_bit = cryp->areq->assoclen * 8;
+ if (cryp->caps->swap_final)
+ size_bit = cpu_to_be32(size_bit);
+
+ stm32_cryp_write(cryp, CRYP_DIN, 0);
+ stm32_cryp_write(cryp, CRYP_DIN, size_bit);
+
+ size_bit = is_encrypt(cryp) ? cryp->areq->cryptlen :
+ cryp->areq->cryptlen - AES_BLOCK_SIZE;
+ size_bit *= 8;
+ if (cryp->caps->swap_final)
+ size_bit = cpu_to_be32(size_bit);
+
+ stm32_cryp_write(cryp, CRYP_DIN, 0);
+ stm32_cryp_write(cryp, CRYP_DIN, size_bit);
+ } else {
+ /* CCM: write CTR0 */
+ u8 iv[AES_BLOCK_SIZE];
+ u32 *iv32 = (u32 *)iv;
+
+ memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
+ memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
+
+ for (i = 0; i < AES_BLOCK_32; i++) {
+ if (!cryp->caps->padding_wa)
+ *iv32 = cpu_to_be32(*iv32);
+ stm32_cryp_write(cryp, CRYP_DIN, *iv32++);
+ }
+ }
+
+ /* Wait for output data */
+ ret = stm32_cryp_wait_output(cryp);
+ if (ret) {
+ dev_err(cryp->dev, "Timeout (read tag)\n");
+ return ret;
+ }
+
+ if (is_encrypt(cryp)) {
+ /* Get and write tag */
+ dst = sg_virt(cryp->out_sg) + _walked_out;
+
+ for (i = 0; i < AES_BLOCK_32; i++) {
+ if (cryp->total_out >= sizeof(u32)) {
+ /* Read a full u32 */
+ *dst = stm32_cryp_read(cryp, CRYP_DOUT);
+
+ dst = stm32_cryp_next_out(cryp, dst,
+ sizeof(u32));
+ cryp->total_out -= sizeof(u32);
+ } else if (!cryp->total_out) {
+ /* Empty fifo out (data from input padding) */
+ stm32_cryp_read(cryp, CRYP_DOUT);
+ } else {
+ /* Read less than an u32 */
+ d32 = stm32_cryp_read(cryp, CRYP_DOUT);
+ d8 = (u8 *)&d32;
+
+ for (j = 0; j < cryp->total_out; j++) {
+ *((u8 *)dst) = *(d8++);
+ dst = stm32_cryp_next_out(cryp, dst, 1);
+ }
+ cryp->total_out = 0;
+ }
+ }
+ } else {
+ /* Get and check tag */
+ u32 in_tag[AES_BLOCK_32], out_tag[AES_BLOCK_32];
+
+ scatterwalk_map_and_copy(in_tag, cryp->in_sg,
+ cryp->total_in_save - cryp->authsize,
+ cryp->authsize, 0);
+
+ for (i = 0; i < AES_BLOCK_32; i++)
+ out_tag[i] = stm32_cryp_read(cryp, CRYP_DOUT);
+
+ if (crypto_memneq(in_tag, out_tag, cryp->authsize))
+ ret = -EBADMSG;
+ }
+
+ /* Disable cryp */
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ return ret;
+}
+
static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
{
u32 cr;
@@ -793,17 +1222,24 @@ static bool stm32_cryp_irq_read_data(struct stm32_cryp
*cryp)
unsigned int i, j;
u32 d32, *dst;
u8 *d8;
+ size_t tag_size;
+
+ /* Do no read tag now (if any) */
+ if (is_encrypt(cryp) && (is_gcm(cryp) || is_ccm(cryp)))
+ tag_size = cryp->authsize;
+ else
+ tag_size = 0;
dst = sg_virt(cryp->out_sg) + _walked_out;
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
- if (likely(cryp->total_out >= sizeof(u32))) {
+ if (likely(cryp->total_out - tag_size >= sizeof(u32))) {
/* Read a full u32 */
*dst = stm32_cryp_read(cryp, CRYP_DOUT);
dst = stm32_cryp_next_out(cryp, dst, sizeof(u32));
cryp->total_out -= sizeof(u32);
- } else if (!cryp->total_out) {
+ } else if (cryp->total_out == tag_size) {
/* Empty fifo out (data from input padding) */
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
} else {
@@ -811,15 +1247,15 @@ static bool stm32_cryp_irq_read_data(struct stm32_cryp
*cryp)
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
d8 = (u8 *)&d32;
- for (j = 0; j < cryp->total_out; j++) {
+ for (j = 0; j < cryp->total_out - tag_size; j++) {
*((u8 *)dst) = *(d8++);
dst = stm32_cryp_next_out(cryp, dst, 1);
}
- cryp->total_out = 0;
+ cryp->total_out = tag_size;
}
}
- return !cryp->total_out || !cryp->total_in;
+ return !(cryp->total_out - tag_size) || !cryp->total_in;
}
static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
@@ -827,33 +1263,219 @@ static void stm32_cryp_irq_write_block(struct
stm32_cryp *cryp)
unsigned int i, j;
u32 *src;
u8 d8[4];
+ size_t tag_size;
+
+ /* Do no write tag (if any) */
+ if (is_decrypt(cryp) && (is_gcm(cryp) || is_ccm(cryp)))
+ tag_size = cryp->authsize;
+ else
+ tag_size = 0;
src = sg_virt(cryp->in_sg) + _walked_in;
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
- if (likely(cryp->total_in >= sizeof(u32))) {
+ if (likely(cryp->total_in - tag_size >= sizeof(u32))) {
/* Write a full u32 */
stm32_cryp_write(cryp, CRYP_DIN, *src);
src = stm32_cryp_next_in(cryp, src, sizeof(u32));
cryp->total_in -= sizeof(u32);
- } else if (!cryp->total_in) {
+ } else if (cryp->total_in == tag_size) {
/* Write padding data */
stm32_cryp_write(cryp, CRYP_DIN, 0);
} else {
/* Write less than an u32 */
memset(d8, 0, sizeof(u32));
- for (j = 0; j < cryp->total_in; j++) {
+ for (j = 0; j < cryp->total_in - tag_size; j++) {
d8[j] = *((u8 *)src);
src = stm32_cryp_next_in(cryp, src, 1);
}
stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
- cryp->total_in = 0;
+ cryp->total_in = tag_size;
}
}
}
+static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
+{
+ int err;
+ u32 cfg, tmp[AES_BLOCK_32];
+ size_t total_in_ori = cryp->total_in;
+ struct scatterlist *out_sg_ori = cryp->out_sg;
+ unsigned int i;
+
+ /* 'Special workaround' procedure described in the datasheet */
+
+ /* a) disable ip */
+ stm32_cryp_write(cryp, CRYP_IMSCR, 0);
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* b) Update IV1R */
+ stm32_cryp_write(cryp, CRYP_IV1RR, cryp->gcm_ctr - 2);
+
+ /* c) change mode to CTR */
+ cfg &= ~CR_ALGO_MASK;
+ cfg |= CR_AES_CTR;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* a) enable IP */
+ cfg |= CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* b) pad and write the last block */
+ stm32_cryp_irq_write_block(cryp);
+ cryp->total_in = total_in_ori;
+ err = stm32_cryp_wait_output(cryp);
+ if (err) {
+ dev_err(cryp->dev, "Timeout (write gcm header)\n");
+ return stm32_cryp_finish_req(cryp, err);
+ }
+
+ /* c) get and store encrypted data */
+ stm32_cryp_irq_read_data(cryp);
+ scatterwalk_map_and_copy(tmp, out_sg_ori,
+ cryp->total_in_save - total_in_ori,
+ total_in_ori, 0);
+
+ /* d) change mode back to AES GCM */
+ cfg &= ~CR_ALGO_MASK;
+ cfg |= CR_AES_GCM;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* e) change phase to Final */
+ cfg &= ~CR_PH_MASK;
+ cfg |= CR_PH_FINAL;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* f) write padded data */
+ for (i = 0; i < AES_BLOCK_32; i++) {
+ if (cryp->total_in)
+ stm32_cryp_write(cryp, CRYP_DIN, tmp[i]);
+ else
+ stm32_cryp_write(cryp, CRYP_DIN, 0);
+
+ cryp->total_in -= min_t(size_t, sizeof(u32), cryp->total_in);
+ }
+
+ /* g) Empty fifo out */
+ err = stm32_cryp_wait_output(cryp);
+ if (err) {
+ dev_err(cryp->dev, "Timeout (write gcm header)\n");
+ return stm32_cryp_finish_req(cryp, err);
+ }
+
+ for (i = 0; i < AES_BLOCK_32; i++)
+ stm32_cryp_read(cryp, CRYP_DOUT);
+
+ /* h) run the he normal Final phase */
+ stm32_cryp_finish_req(cryp, 0);
+}
+
+static void stm32_cryp_irq_set_npblb(struct stm32_cryp *cryp)
+{
+ u32 cfg, payload_bytes;
+
+ /* disable ip, set NPBLB and reneable ip */
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ payload_bytes = is_decrypt(cryp) ? cryp->total_in - cryp->authsize :
+ cryp->total_in;
+ cfg |= (cryp->hw_blocksize - payload_bytes) << CR_NBPBL_SHIFT;
+ cfg |= CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+}
+
+static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
+{
+ int err = 0;
+ u32 cfg, iv1tmp;
+ u32 cstmp1[AES_BLOCK_32], cstmp2[AES_BLOCK_32], tmp[AES_BLOCK_32];
+ size_t last_total_out, total_in_ori = cryp->total_in;
+ struct scatterlist *out_sg_ori = cryp->out_sg;
+ unsigned int i;
+
+ /* 'Special workaround' procedure described in the datasheet */
+ cryp->flags |= FLG_CCM_PADDED_WA;
+
+ /* a) disable ip */
+ stm32_cryp_write(cryp, CRYP_IMSCR, 0);
+
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* b) get IV1 from CRYP_CSGCMCCM7 */
+ iv1tmp = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + 7 * 4);
+
+ /* c) Load CRYP_CSGCMCCMxR */
+ for (i = 0; i < ARRAY_SIZE(cstmp1); i++)
+ cstmp1[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
+
+ /* d) Write IV1R */
+ stm32_cryp_write(cryp, CRYP_IV1RR, iv1tmp);
+
+ /* e) change mode to CTR */
+ cfg &= ~CR_ALGO_MASK;
+ cfg |= CR_AES_CTR;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* a) enable IP */
+ cfg |= CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* b) pad and write the last block */
+ stm32_cryp_irq_write_block(cryp);
+ cryp->total_in = total_in_ori;
+ err = stm32_cryp_wait_output(cryp);
+ if (err) {
+ dev_err(cryp->dev, "Timeout (wite ccm padded data)\n");
+ return stm32_cryp_finish_req(cryp, err);
+ }
+
+ /* c) get and store decrypted data */
+ last_total_out = cryp->total_out;
+ stm32_cryp_irq_read_data(cryp);
+
+ memset(tmp, 0, sizeof(tmp));
+ scatterwalk_map_and_copy(tmp, out_sg_ori,
+ cryp->total_out_save - last_total_out,
+ last_total_out, 0);
+
+ /* d) Load again CRYP_CSGCMCCMxR */
+ for (i = 0; i < ARRAY_SIZE(cstmp2); i++)
+ cstmp2[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
+
+ /* e) change mode back to AES CCM */
+ cfg &= ~CR_ALGO_MASK;
+ cfg |= CR_AES_CCM;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* f) change phase to header */
+ cfg &= ~CR_PH_MASK;
+ cfg |= CR_PH_HEADER;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ /* g) XOR and write padded data */
+ for (i = 0; i < ARRAY_SIZE(tmp); i++) {
+ tmp[i] ^= cstmp1[i];
+ tmp[i] ^= cstmp2[i];
+ stm32_cryp_write(cryp, CRYP_DIN, tmp[i]);
+ }
+
+ /* h) wait for completion */
+ err = stm32_cryp_wait_busy(cryp);
+ if (err)
+ dev_err(cryp->dev, "Timeout (wite ccm padded data)\n");
+
+ /* i) run the he normal Final phase */
+ stm32_cryp_finish_req(cryp, err);
+}
+
static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
{
if (unlikely(!cryp->total_in)) {
@@ -861,28 +1483,220 @@ static void stm32_cryp_irq_write_data(struct stm32_cryp
*cryp)
return;
}
+ if (unlikely(cryp->total_in < AES_BLOCK_SIZE &&
+ (stm32_cryp_get_hw_mode(cryp) == CR_AES_GCM) &&
+ is_encrypt(cryp))) {
+ /* Padding for AES GCM encryption */
+ if (cryp->caps->padding_wa)
+ /* Special case 1 */
+ return stm32_cryp_irq_write_gcm_padded_data(cryp);
+
+ /* Setting padding bytes (NBBLB) */
+ stm32_cryp_irq_set_npblb(cryp);
+ }
+
+ if (unlikely((cryp->total_in - cryp->authsize < AES_BLOCK_SIZE) &&
+ (stm32_cryp_get_hw_mode(cryp) == CR_AES_CCM) &&
+ is_decrypt(cryp))) {
+ /* Padding for AES CCM decryption */
+ if (cryp->caps->padding_wa)
+ /* Special case 2 */
+ return stm32_cryp_irq_write_ccm_padded_data(cryp);
+
+ /* Setting padding bytes (NBBLB) */
+ stm32_cryp_irq_set_npblb(cryp);
+ }
+
if (is_aes(cryp) && is_ctr(cryp))
stm32_cryp_check_ctr_counter(cryp);
stm32_cryp_irq_write_block(cryp);
}
+static void stm32_cryp_irq_write_gcm_header(struct stm32_cryp *cryp)
+{
+ int err;
+ unsigned int i, j;
+ u32 cfg, *src;
+
+ src = sg_virt(cryp->in_sg) + _walked_in;
+
+ for (i = 0; i < AES_BLOCK_32; i++) {
+ stm32_cryp_write(cryp, CRYP_DIN, *src);
+
+ src = stm32_cryp_next_in(cryp, src, sizeof(u32));
+ cryp->total_in -= min_t(size_t, sizeof(u32), cryp->total_in);
+
+ /* Check if whole header written */
+ if ((cryp->total_in_save - cryp->total_in) ==
+ cryp->areq->assoclen) {
+ /* Write padding if needed */
+ for (j = i + 1; j < AES_BLOCK_32; j++)
+ stm32_cryp_write(cryp, CRYP_DIN, 0);
+
+ /* Wait for completion */
+ err = stm32_cryp_wait_busy(cryp);
+ if (err) {
+ dev_err(cryp->dev, "Timeout (gcm header)\n");
+ return stm32_cryp_finish_req(cryp, err);
+ }
+
+ if (stm32_cryp_get_input_text_len(cryp)) {
+ /* Phase 3 : payload */
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ cfg &= ~CR_PH_MASK;
+ cfg |= CR_PH_PAYLOAD;
+ cfg |= CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+ } else {
+ /* Phase 4 : tag */
+ stm32_cryp_write(cryp, CRYP_IMSCR, 0);
+ stm32_cryp_finish_req(cryp, 0);
+ }
+
+ break;
+ }
+
+ if (!cryp->total_in)
+ break;
+ }
+}
+
+static void stm32_cryp_irq_write_ccm_header(struct stm32_cryp *cryp)
+{
+ int err;
+ unsigned int i = 0, j, k;
+ u32 alen, cfg, *src;
+ u8 d8[4];
+
+ src = sg_virt(cryp->in_sg) + _walked_in;
+ alen = cryp->areq->assoclen;
+
+ if (!_walked_in) {
+ if (cryp->areq->assoclen <= 65280) {
+ /* Write first u32 of B1 */
+ d8[0] = (alen >> 8) & 0xFF;
+ d8[1] = alen & 0xFF;
+ d8[2] = *((u8 *)src);
+ src = stm32_cryp_next_in(cryp, src, 1);
+ d8[3] = *((u8 *)src);
+ src = stm32_cryp_next_in(cryp, src, 1);
+
+ stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
+ i++;
+
+ cryp->total_in -= min_t(size_t, 2, cryp->total_in);
+ } else {
+ /* Build the two first u32 of B1 */
+ d8[0] = 0xFF;
+ d8[1] = 0xFE;
+ d8[2] = alen & 0xFF000000;
+ d8[3] = alen & 0x00FF0000;
+
+ stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
+ i++;
+
+ d8[0] = alen & 0x0000FF00;
+ d8[1] = alen & 0x000000FF;
+ d8[2] = *((u8 *)src);
+ src = stm32_cryp_next_in(cryp, src, 1);
+ d8[3] = *((u8 *)src);
+ src = stm32_cryp_next_in(cryp, src, 1);
+
+ stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
+ i++;
+
+ cryp->total_in -= min_t(size_t, 2, cryp->total_in);
+ }
+ }
+
+ /* Write next u32 */
+ for (; i < AES_BLOCK_32; i++) {
+ /* Build an u32 */
+ memset(d8, 0, sizeof(u32));
+ for (k = 0; k < sizeof(u32); k++) {
+ d8[k] = *((u8 *)src);
+ src = stm32_cryp_next_in(cryp, src, 1);
+
+ cryp->total_in -= min_t(size_t, 1, cryp->total_in);
+ if ((cryp->total_in_save - cryp->total_in) == alen)
+ break;
+ }
+
+ stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
+
+ if ((cryp->total_in_save - cryp->total_in) == alen) {
+ /* Write padding if needed */
+ for (j = i + 1; j < AES_BLOCK_32; j++)
+ stm32_cryp_write(cryp, CRYP_DIN, 0);
+
+ /* Wait for completion */
+ err = stm32_cryp_wait_busy(cryp);
+ if (err) {
+ dev_err(cryp->dev, "Timeout (ccm header)\n");
+ return stm32_cryp_finish_req(cryp, err);
+ }
+
+ if (stm32_cryp_get_input_text_len(cryp)) {
+ /* Phase 3 : payload */
+ cfg = stm32_cryp_read(cryp, CRYP_CR);
+ cfg &= ~CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+
+ cfg &= ~CR_PH_MASK;
+ cfg |= CR_PH_PAYLOAD;
+ cfg |= CR_CRYPEN;
+ stm32_cryp_write(cryp, CRYP_CR, cfg);
+ } else {
+ /* Phase 4 : tag */
+ stm32_cryp_write(cryp, CRYP_IMSCR, 0);
+ stm32_cryp_finish_req(cryp, 0);
+ }
+
+ break;
+ }
+ }
+}
+
static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
{
struct stm32_cryp *cryp = arg;
+ u32 ph;
if (cryp->irq_status & MISR_OUT)
/* Output FIFO IRQ: read data */
if (unlikely(stm32_cryp_irq_read_data(cryp))) {
/* All bytes processed, finish */
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
- stm32_cryp_finish_req(cryp);
+ stm32_cryp_finish_req(cryp, 0);
return IRQ_HANDLED;
}
if (cryp->irq_status & MISR_IN) {
- /* Input FIFO IRQ: write data */
- stm32_cryp_irq_write_data(cryp);
+ if (is_gcm(cryp)) {
+ ph = stm32_cryp_read(cryp, CRYP_CR) & CR_PH_MASK;
+ if (unlikely(ph == CR_PH_HEADER))
+ /* Write Header */
+ stm32_cryp_irq_write_gcm_header(cryp);
+ else
+ /* Input FIFO IRQ: write data */
+ stm32_cryp_irq_write_data(cryp);
+ cryp->gcm_ctr++;
+ } else if (is_ccm(cryp)) {
+ ph = stm32_cryp_read(cryp, CRYP_CR) & CR_PH_MASK;
+ if (unlikely(ph == CR_PH_HEADER))
+ /* Write Header */
+ stm32_cryp_irq_write_ccm_header(cryp);
+ else
+ /* Input FIFO IRQ: write data */
+ stm32_cryp_irq_write_data(cryp);
+ } else {
+ /* Input FIFO IRQ: write data */
+ stm32_cryp_irq_write_data(cryp);
+ }
}
return IRQ_HANDLED;
@@ -1044,8 +1858,56 @@ static struct crypto_alg crypto_algs[] = {
},
};
+static struct aead_alg aead_algs[] = {
+{
+ .setkey = stm32_cryp_aes_aead_setkey,
+ .setauthsize = stm32_cryp_aes_gcm_setauthsize,
+ .encrypt = stm32_cryp_aes_gcm_encrypt,
+ .decrypt = stm32_cryp_aes_gcm_decrypt,
+ .init = stm32_cryp_aes_aead_init,
+ .ivsize = 12,
+ .maxauthsize = AES_BLOCK_SIZE,
+
+ .base = {
+ .cra_name = "gcm(aes)",
+ .cra_driver_name = "stm32-gcm-aes",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_ASYNC,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
+ .cra_alignmask = 0xf,
+ .cra_module = THIS_MODULE,
+ },
+},
+{
+ .setkey = stm32_cryp_aes_aead_setkey,
+ .setauthsize = stm32_cryp_aes_ccm_setauthsize,
+ .encrypt = stm32_cryp_aes_ccm_encrypt,
+ .decrypt = stm32_cryp_aes_ccm_decrypt,
+ .init = stm32_cryp_aes_aead_init,
+ .ivsize = AES_BLOCK_SIZE,
+ .maxauthsize = AES_BLOCK_SIZE,
+
+ .base = {
+ .cra_name = "ccm(aes)",
+ .cra_driver_name = "stm32-ccm-aes",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_ASYNC,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
+ .cra_alignmask = 0xf,
+ .cra_module = THIS_MODULE,
+ },
+},
+};
+
+static const struct stm32_cryp_caps f7_data = {
+ .swap_final = true,
+ .padding_wa = true,
+};
+
static const struct of_device_id stm32_dt_ids[] = {
- { .compatible = "st,stm32f756-cryp", },
+ { .compatible = "st,stm32f756-cryp", .data = &f7_data},
{},
};
MODULE_DEVICE_TABLE(of, stm32_dt_ids);
@@ -1062,6 +1924,10 @@ static int stm32_cryp_probe(struct platform_device *pdev)
if (!cryp)
return -ENOMEM;
+ cryp->caps = of_device_get_match_data(dev);
+ if (!cryp->caps)
+ return -ENODEV;
+
cryp->dev = dev;
mutex_init(&cryp->lock);
@@ -1130,10 +1996,16 @@ static int stm32_cryp_probe(struct platform_device
*pdev)
goto err_algs;
}
+ ret = crypto_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
+ if (ret)
+ goto err_aead_algs;
+
dev_info(dev, "Initialized\n");
return 0;
+err_aead_algs:
+ crypto_unregister_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
err_algs:
err_engine2:
crypto_engine_exit(cryp->engine);
@@ -1154,6 +2026,7 @@ static int stm32_cryp_remove(struct platform_device *pdev)
if (!cryp)
return -ENODEV;
+ crypto_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
crypto_unregister_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
crypto_engine_exit(cryp->engine);
--
2.7.4
