diff options
Diffstat (limited to 'crypto/ctr.c')
| -rw-r--r-- | crypto/ctr.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c index 810d5ec..b974a9f 100644 --- a/crypto/ctr.c +++ b/crypto/ctr.c @@ -23,6 +23,7 @@ struct ctr_instance_ctx { struct crypto_spawn alg; unsigned int noncesize; unsigned int ivsize; + unsigned int countersize; }; struct crypto_ctr_ctx { @@ -186,7 +187,6 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc, unsigned long alignmask = crypto_cipher_alignmask(child); u8 cblk[bsize + alignmask]; u8 *counterblk = (u8 *)ALIGN((unsigned long)cblk, alignmask + 1); - unsigned int countersize; int err; blkcipher_walk_init(&walk, dst, src, nbytes); @@ -198,18 +198,18 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc, memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize); /* initialize counter portion of counter block */ - countersize = bsize - ictx->noncesize - ictx->ivsize; - ctr_inc_quad(counterblk + (bsize - countersize), countersize); + ctr_inc_quad(counterblk + (bsize - ictx->countersize), + ictx->countersize); while (walk.nbytes) { if (walk.src.virt.addr == walk.dst.virt.addr) nbytes = crypto_ctr_crypt_inplace(&walk, child, counterblk, - countersize); + ictx->countersize); else nbytes = crypto_ctr_crypt_segment(&walk, child, counterblk, - countersize); + ictx->countersize); err = blkcipher_walk_done(desc, &walk, nbytes); } @@ -251,6 +251,7 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb) struct ctr_instance_ctx *ictx; unsigned int noncesize; unsigned int ivsize; + unsigned int countersize; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); @@ -270,9 +271,17 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb) if (err) goto out_put_alg; - /* verify size of nonce + iv + counter */ + err = crypto_attr_u32(tb[4], &countersize); + if (err) + goto out_put_alg; + + /* verify size of nonce + iv + counter + * counter must be >= 4 bytes. + */ err = -EINVAL; - if ((noncesize + ivsize) >= alg->cra_blocksize) + if (((noncesize + ivsize + countersize) < alg->cra_blocksize) || + ((noncesize + ivsize) > alg->cra_blocksize) || + (countersize > alg->cra_blocksize) || (countersize < 4)) goto out_put_alg; inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); @@ -282,20 +291,21 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb) err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, - "ctr(%s,%u,%u)", alg->cra_name, noncesize, - ivsize) >= CRYPTO_MAX_ALG_NAME) { + "ctr(%s,%u,%u,%u)", alg->cra_name, noncesize, + ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) { goto err_free_inst; } if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, - "ctr(%s,%u,%u)", alg->cra_driver_name, noncesize, - ivsize) >= CRYPTO_MAX_ALG_NAME) { + "ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize, + ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) { goto err_free_inst; } ictx = crypto_instance_ctx(inst); ictx->noncesize = noncesize; ictx->ivsize = ivsize; + ictx->countersize = countersize; err = crypto_init_spawn(&ictx->alg, alg, inst, CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
