crypto: algif_skcipher - Use chunksize instead of blocksize

When algif_skcipher does a partial operation it always process data
that is a multiple of blocksize.  However, for algorithms such as
CTR this is wrong because even though it can process any number of
bytes overall, the partial block must come at the very end and not
in the middle.

This is exactly what chunksize is meant to describe so this patch
changes blocksize to chunksize.

Fixes: b285ae43087f ("crypto: algif_skcipher - User-space...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index c1601edd70e359854aeca195f72f385ca17ba721..e2c8ab408bed528b3ca109add88b63f25fd0b3e1 100644 (file)
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -56,7 +56,7 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
        struct alg_sock *pask = alg_sk(psk);
        struct af_alg_ctx *ctx = ask->private;
        struct crypto_skcipher *tfm = pask->private;
-       unsigned int bs = crypto_skcipher_blocksize(tfm);
+       unsigned int bs = crypto_skcipher_chunksize(tfm);
        struct af_alg_async_req *areq;
        int err = 0;
        size_t len = 0;

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 734b6f7081b8a72954f450562afa64a968b75beb..3175dfeaed2c945ad5db9ed679b8823e6dfe4519 100644 (file)
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -205,19 +205,6 @@ static inline unsigned int crypto_skcipher_alg_max_keysize(
        return alg->max_keysize;
 }
 
-static inline unsigned int crypto_skcipher_alg_chunksize(
-       struct skcipher_alg *alg)
-{
-       if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
-           CRYPTO_ALG_TYPE_BLKCIPHER)
-               return alg->base.cra_blocksize;
-
-       if (alg->base.cra_ablkcipher.encrypt)
-               return alg->base.cra_blocksize;
-
-       return alg->chunksize;
-}
-
 static inline unsigned int crypto_skcipher_alg_walksize(
        struct skcipher_alg *alg)
 {
@@ -231,23 +218,6 @@ static inline unsigned int crypto_skcipher_alg_walksize(
        return alg->walksize;
 }
 
-/**
- * crypto_skcipher_chunksize() - obtain chunk size
- * @tfm: cipher handle
- *
- * The block size is set to one for ciphers such as CTR.  However,
- * you still need to provide incremental updates in multiples of
- * the underlying block size as the IV does not have sub-block
- * granularity.  This is known in this API as the chunk size.
- *
- * Return: chunk size in bytes
- */
-static inline unsigned int crypto_skcipher_chunksize(
-       struct crypto_skcipher *tfm)
-{
-       return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm));
-}
-
 /**
  * crypto_skcipher_walksize() - obtain walk size
  * @tfm: cipher handle

diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index 37c164234d970b7f891f0795579d5227be8bf3e9..aada87916918497c08cb36df3bcdf52d8afd6816 100644 (file)
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -304,6 +304,36 @@ static inline unsigned int crypto_skcipher_blocksize(
        return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm));
 }
 
+static inline unsigned int crypto_skcipher_alg_chunksize(
+       struct skcipher_alg *alg)
+{
+       if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+           CRYPTO_ALG_TYPE_BLKCIPHER)
+               return alg->base.cra_blocksize;
+
+       if (alg->base.cra_ablkcipher.encrypt)
+               return alg->base.cra_blocksize;
+
+       return alg->chunksize;
+}
+
+/**
+ * crypto_skcipher_chunksize() - obtain chunk size
+ * @tfm: cipher handle
+ *
+ * The block size is set to one for ciphers such as CTR.  However,
+ * you still need to provide incremental updates in multiples of
+ * the underlying block size as the IV does not have sub-block
+ * granularity.  This is known in this API as the chunk size.
+ *
+ * Return: chunk size in bytes
+ */
+static inline unsigned int crypto_skcipher_chunksize(
+       struct crypto_skcipher *tfm)
+{
+       return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm));
+}
+
 static inline unsigned int crypto_sync_skcipher_blocksize(
        struct crypto_sync_skcipher *tfm)
 {