summaryrefslogtreecommitdiffstats
path: root/include/crypto/skcipher.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/crypto/skcipher.h')
-rw-r--r--include/crypto/skcipher.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index 37c164234d97..aada87916918 100644
--- 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)
{