diff options
Diffstat (limited to 'drivers/crypto/vmx/aes_ctr.c')
| -rw-r--r-- | drivers/crypto/vmx/aes_ctr.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/crypto/vmx/aes_ctr.c b/drivers/crypto/vmx/aes_ctr.c index 1e754ae4e850..ee1306cd8f59 100644 --- a/drivers/crypto/vmx/aes_ctr.c +++ b/drivers/crypto/vmx/aes_ctr.c @@ -115,6 +115,7 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *src, unsigned int nbytes) { int ret; + u64 inc; struct blkcipher_walk walk; struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm)); @@ -143,7 +144,12 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc, walk.iv); pagefault_enable(); - crypto_inc(walk.iv, AES_BLOCK_SIZE); + /* We need to update IV mostly for last bytes/round */ + inc = (nbytes & AES_BLOCK_MASK) / AES_BLOCK_SIZE; + if (inc > 0) + while (inc--) + crypto_inc(walk.iv, AES_BLOCK_SIZE); + nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, &walk, nbytes); } |