On Sun, 8 Sep 2019 at 09:04, Uri Shir <[email protected]> wrote:
>
> In XTS encryption/decryption the plaintext byte size
> can be >= AES_BLOCK_SIZE. This patch enable the AES-XTS ciphertext
> stealing implementation in ccree driver.
>
> Signed-off-by: Uri Shir <[email protected]>
> ---
> drivers/crypto/ccree/cc_cipher.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/crypto/ccree/cc_cipher.c
> b/drivers/crypto/ccree/cc_cipher.c
> index 5b58226..a95d3bd 100644
> --- a/drivers/crypto/ccree/cc_cipher.c
> +++ b/drivers/crypto/ccree/cc_cipher.c
> @@ -116,10 +116,6 @@ static int validate_data_size(struct cc_cipher_ctx
> *ctx_p,
> case S_DIN_to_AES:
> switch (ctx_p->cipher_mode) {
> case DRV_CIPHER_XTS:
> - if (size >= AES_BLOCK_SIZE &&
> - IS_ALIGNED(size, AES_BLOCK_SIZE))
> - return 0;
> - break;
You should still check for size < block size.
> case DRV_CIPHER_CBC_CTS:
> if (size >= AES_BLOCK_SIZE)
> return 0;
> @@ -945,7 +941,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts(paes)",
> .driver_name = "xts-paes-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
No need for these blocksize changes - just keep them as they are.
> .template_skcipher = {
> .setkey = cc_cipher_sethkey,
> .encrypt = cc_cipher_encrypt,
> @@ -963,7 +959,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts512(paes)",
> .driver_name = "xts-paes-du512-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
> .template_skcipher = {
> .setkey = cc_cipher_sethkey,
> .encrypt = cc_cipher_encrypt,
> @@ -982,7 +978,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts4096(paes)",
> .driver_name = "xts-paes-du4096-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
> .template_skcipher = {
> .setkey = cc_cipher_sethkey,
> .encrypt = cc_cipher_encrypt,
> @@ -1203,7 +1199,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts(aes)",
> .driver_name = "xts-aes-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
> .template_skcipher = {
> .setkey = cc_cipher_setkey,
> .encrypt = cc_cipher_encrypt,
> @@ -1220,7 +1216,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts512(aes)",
> .driver_name = "xts-aes-du512-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
> .template_skcipher = {
> .setkey = cc_cipher_setkey,
> .encrypt = cc_cipher_encrypt,
> @@ -1238,7 +1234,7 @@ static const struct cc_alg_template skcipher_algs[] = {
> {
> .name = "xts4096(aes)",
> .driver_name = "xts-aes-du4096-ccree",
> - .blocksize = AES_BLOCK_SIZE,
> + .blocksize = 1,
> .template_skcipher = {
> .setkey = cc_cipher_setkey,
> .encrypt = cc_cipher_encrypt,
> --
> 2.7.4
>
