ALG_SET_KEY_TYPE requires caller to pass the key_type to be used
for AES encryption/decryption.
Sometimes the cipher key will be stored in the device's
hardware (eFuse, BBRAM etc).So,there is a need to specify the information
about the key-type to use it for Encrypt or Decrypt operations.
This patch implements the above requirement.
Signed-off-by: Kalyani Akula <kalyani.akula@xxxxxxxxxx>
---
crypto/af_alg.c | 7 +++++++
crypto/algif_skcipher.c | 12 ++++++++++++
crypto/blkcipher.c | 9 +++++++++
crypto/skcipher.c | 18 ++++++++++++++++++
include/crypto/if_alg.h | 2 ++
include/crypto/skcipher.h | 12 +++++++++++-
include/linux/crypto.h | 12 ++++++++++++
include/uapi/linux/if_alg.h | 1 +
8 files changed, 72 insertions(+), 1 deletion(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index b053179..9ea6b86 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -261,6 +261,13 @@ static int alg_setsockopt(struct socket *sock, int level, int optname,
if (!type->setauthsize)
goto unlock;
err = type->setauthsize(ask->private, optlen);
+ break;
+ case ALG_SET_KEY_TYPE:
+ if (sock->state == SS_CONNECTED)
+ goto unlock;
+ if (!type->setkeytype)
+ goto unlock;
+ err = type->setkeytype(ask->private, optval, optlen);
}
unlock:
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index cfdaab2..9164465 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -320,6 +320,17 @@ static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
return crypto_skcipher_setkey(private, key, keylen);
}
+static int skcipher_setkeytype(void *private, const u8 *key,
+ unsigned int keylen)
+{
+ struct skcipher_tfm *tfm = private;
+ int err;
+
+ err = crypto_skcipher_setkeytype(tfm->skcipher, key, keylen);
+
+ return err;
+}
+
static void skcipher_sock_destruct(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
@@ -384,6 +395,7 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
.bind = skcipher_bind,
.release = skcipher_release,
.setkey = skcipher_setkey,
+ .setkeytype = skcipher_setkeytype,
.accept = skcipher_accept_parent,
.accept_nokey = skcipher_accept_parent_nokey,
.ops = &algif_skcipher_ops,
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index f93abf1..3ea0e7f 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -408,6 +408,14 @@ static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
return cipher->setkey(tfm, key, keylen);
}
+static int setkeytype(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
+
+ return cipher->setkeytype(tfm, key, keylen);
+}
+
static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
@@ -478,6 +486,7 @@ static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
unsigned long addr;
crt->setkey = setkey;
+ crt->setkeytype = setkeytype;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 0bd8c6c..cb794dd 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -604,6 +604,23 @@ static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm,
return 0;
}
+static int skcipher_setkeytype_blkcipher(struct crypto_skcipher *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
+ struct crypto_blkcipher *blkcipher = *ctx;
+ int err;
+
+ crypto_blkcipher_clear_flags(blkcipher, ~0);
+ crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+ err = crypto_blkcipher_setkeytype(blkcipher, key, keylen);
+ crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) &
+ CRYPTO_TFM_RES_MASK);
+
+ return err;
+}
+
static int skcipher_crypt_blkcipher(struct skcipher_request *req,
int (*crypt)(struct blkcipher_desc *,
struct scatterlist *,
@@ -670,6 +687,7 @@ static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
tfm->exit = crypto_exit_skcipher_ops_blkcipher;
skcipher->setkey = skcipher_setkey_blkcipher;
+ skcipher->setkeytype = skcipher_setkeytype_blkcipher;
skcipher->encrypt = skcipher_encrypt_blkcipher;
skcipher->decrypt = skcipher_decrypt_blkcipher;
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index 482461d..202298e 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -51,6 +51,8 @@ struct af_alg_type {
void *(*bind)(const char *name, u32 type, u32 mask);
void (*release)(void *private);
int (*setkey)(void *private, const u8 *key, unsigned int keylen);
+ int (*setkeytype)(void *private, const u8 *keytype,
+ unsigned int keylen);
int (*accept)(void *private, struct sock *sk);
int (*accept_nokey)(void *private, struct sock *sk);
int (*setauthsize)(void *private, unsigned int authsize);
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index 2f327f0..54f6752 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -54,7 +54,9 @@ struct skcipher_givcrypt_request {
struct crypto_skcipher {
int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
- unsigned int keylen);
+ unsigned int keylen);
+ int (*setkeytype)(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen);
int (*encrypt)(struct skcipher_request *req);
int (*decrypt)(struct skcipher_request *req);
@@ -125,6 +127,8 @@ struct crypto_skcipher {
struct skcipher_alg {
int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
+ int (*setkeytype)(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen);
int (*encrypt)(struct skcipher_request *req);
int (*decrypt)(struct skcipher_request *req);
int (*init)(struct crypto_skcipher *tfm);
@@ -401,6 +405,12 @@ static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
return tfm->setkey(tfm, key, keylen);
}
+static inline int crypto_skcipher_setkeytype(struct crypto_skcipher *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ return tfm->setkeytype(tfm, key, keylen);
+}
+
static inline unsigned int crypto_skcipher_default_keysize(
struct crypto_skcipher *tfm)
{
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index e8839d3..bda8380 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -292,6 +292,8 @@ struct ablkcipher_alg {
struct blkcipher_alg {
int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen);
+ int (*setkeytype)(struct crypto_tfm *tfm, const u8 *keytype,
+ unsigned int keylen);
int (*encrypt)(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes);
@@ -563,6 +565,8 @@ struct blkcipher_tfm {
void *iv;
int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen);
+ int (*setkeytype)(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen);
int (*encrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes);
int (*decrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
@@ -1281,6 +1285,14 @@ static inline int crypto_blkcipher_setkey(struct crypto_blkcipher *tfm,
key, keylen);
}
+static inline int crypto_blkcipher_setkeytype(struct crypto_blkcipher *tfm,
+ const u8 *key,
+ unsigned int keylen)
+{
+ return crypto_blkcipher_crt(tfm)->setkeytype(crypto_blkcipher_tfm(tfm),
+ key, keylen);
+}
+
/**
* crypto_blkcipher_encrypt() - encrypt plaintext
* @desc: reference to the block cipher handle with meta data
diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h
index bc2bcde..aa31b18 100644
--- a/include/uapi/linux/if_alg.h
+++ b/include/uapi/linux/if_alg.h
@@ -35,6 +35,7 @@ struct af_alg_iv {
#define ALG_SET_OP 3
#define ALG_SET_AEAD_ASSOCLEN 4
#define ALG_SET_AEAD_AUTHSIZE 5
+#define ALG_SET_KEY_TYPE 6
/* Operations */
#define ALG_OP_DECRYPT 0
--
1.9.5
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