crypto: skcipher - Add crypto_skcipher_has_setkey

This patch adds a way for skcipher users to determine whether a key
is required by a transform.

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 7591928be7ca789cfc909b3ea300fb6f2fd2cb6f..d199c0b1751c91cbcc5a978aadb97cdf609e33ab 100644 (file)
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -118,6 +118,7 @@ static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
        skcipher->decrypt = skcipher_decrypt_blkcipher;
 
        skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
+       skcipher->has_setkey = calg->cra_blkcipher.max_keysize;
 
        return 0;
 }
@@ -210,6 +211,7 @@ static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
        skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
        skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
                            sizeof(struct ablkcipher_request);
+       skcipher->has_setkey = calg->cra_ablkcipher.max_keysize;
 
        return 0;
 }

diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index d8dd41fb034fe5af52b68699096abb6ebc5559d5..fd8742a40ff3e93476ec3b8cdb1370200275b6d3 100644 (file)
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -61,6 +61,8 @@ struct crypto_skcipher {
        unsigned int ivsize;
        unsigned int reqsize;
 
+       bool has_setkey;
+
        struct crypto_tfm base;
 };
 
@@ -305,6 +307,11 @@ static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
        return tfm->setkey(tfm, key, keylen);
 }
 
+static inline bool crypto_skcipher_has_setkey(struct crypto_skcipher *tfm)
+{
+       return tfm->has_setkey;
+}
+
 /**
  * crypto_skcipher_reqtfm() - obtain cipher handle from request
  * @req: skcipher_request out of which the cipher handle is to be obtained