From 2d506d4fa1df18aa9505820722f834426edc907f Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Sun, 21 Oct 2007 16:04:23 +0800 Subject: [PATCH] [CRYPTO] geode: use consistent IV copy It is enough if the IV is copied before and after the while loop. With DM-Crypt is seems not be required to save the IV after encrytion because a new one is used in the request (dunno about other users). It is not save to load the IV within while loop and not save afterwards because we mill end up with the wrong IV if the request goes consists of more than one page. Signed-off-by: Sebastian Siewior Signed-off-by: Herbert Xu --- drivers/crypto/geode-aes.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c index 5008a1cddffb..6c04f1363e6d 100644 --- a/drivers/crypto/geode-aes.c +++ b/drivers/crypto/geode-aes.c @@ -226,6 +226,7 @@ geode_cbc_decrypt(struct blkcipher_desc *desc, blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); + memcpy(op->iv, walk.iv, AES_IV_LENGTH); while((nbytes = walk.nbytes)) { op->src = walk.src.virt.addr, @@ -234,16 +235,13 @@ geode_cbc_decrypt(struct blkcipher_desc *desc, op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); op->dir = AES_DIR_DECRYPT; - memcpy(op->iv, walk.iv, AES_IV_LENGTH); - ret = geode_aes_crypt(op); - memcpy(walk.iv, op->iv, AES_IV_LENGTH); nbytes -= ret; - err = blkcipher_walk_done(desc, &walk, nbytes); } + memcpy(walk.iv, op->iv, AES_IV_LENGTH); return err; } @@ -258,6 +256,7 @@ geode_cbc_encrypt(struct blkcipher_desc *desc, blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); + memcpy(op->iv, walk.iv, AES_IV_LENGTH); while((nbytes = walk.nbytes)) { op->src = walk.src.virt.addr, @@ -266,13 +265,12 @@ geode_cbc_encrypt(struct blkcipher_desc *desc, op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); op->dir = AES_DIR_ENCRYPT; - memcpy(op->iv, walk.iv, AES_IV_LENGTH); - ret = geode_aes_crypt(op); nbytes -= ret; err = blkcipher_walk_done(desc, &walk, nbytes); } + memcpy(walk.iv, op->iv, AES_IV_LENGTH); return err; } -- 2.20.1