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crypto: atmel-{aes,tdes} - Do not save IV for ECB mode
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ECB mode does not use IV.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Tudor Ambarus authored and Herbert Xu committed Dec 11, 2019
1 parent 75eca7a commit c65d123
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Showing 2 changed files with 12 additions and 4 deletions.
9 changes: 7 additions & 2 deletions drivers/crypto/atmel-aes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -515,6 +515,9 @@ static void atmel_aes_set_iv_as_last_ciphertext_block(struct atmel_aes_dev *dd)

static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
{
struct skcipher_request *req = skcipher_request_cast(dd->areq);
struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);

#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
if (dd->ctx->is_aead)
atmel_aes_authenc_complete(dd, err);
Expand All @@ -523,7 +526,8 @@ static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
clk_disable(dd->iclk);
dd->flags &= ~AES_FLAGS_BUSY;

if (!dd->ctx->is_aead)
if (!dd->ctx->is_aead &&
(rctx->mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB)
atmel_aes_set_iv_as_last_ciphertext_block(dd);

if (dd->is_async)
Expand Down Expand Up @@ -1130,7 +1134,8 @@ static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode)
rctx = skcipher_request_ctx(req);
rctx->mode = mode;

if (!(mode & AES_FLAGS_ENCRYPT) && (req->src == req->dst)) {
if ((mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB &&
!(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) {
unsigned int ivsize = crypto_skcipher_ivsize(skcipher);

if (req->cryptlen >= ivsize)
Expand Down
7 changes: 5 additions & 2 deletions drivers/crypto/atmel-tdes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -593,12 +593,14 @@ atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd)
static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
{
struct skcipher_request *req = dd->req;
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);

clk_disable_unprepare(dd->iclk);

dd->flags &= ~TDES_FLAGS_BUSY;

atmel_tdes_set_iv_as_last_ciphertext_block(dd);
if ((rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB)
atmel_tdes_set_iv_as_last_ciphertext_block(dd);

req->base.complete(&req->base, err);
}
Expand Down Expand Up @@ -728,7 +730,8 @@ static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)

rctx->mode = mode;

if (!(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) {
if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB &&
!(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) {
unsigned int ivsize = crypto_skcipher_ivsize(skcipher);

if (req->cryptlen >= ivsize)
Expand Down

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