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Date: Thu, 31 Mar 2016 18:38:20 -0700
From: Tadeusz Struk <tadeusz.struk@...el.com>
To: herbert@...dor.apana.org.au
Cc: tadeusz.struk@...el.com, smueller@...onox.de,
linux-api@...r.kernel.org, marcel@...tmann.org,
linux-kernel@...r.kernel.org, dhowells@...hat.com,
keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
dwmw2@...radead.org, davem@...emloft.net
Subject: [PATCH v4 6/7] crypto: KEYS - add generic handlers to symmetric key
type
This adds generic sign, verify, encrypt, decrypt accessor
functions to the asymmetric key type. These will be defined by
asymmetric subtypes, similarly to how public_key currently defines
the verify_signature function.
Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
---
crypto/asymmetric_keys/asymmetric_type.c | 88 ++++++++++++++++++++++++++++++
include/keys/asymmetric-subtype.h | 10 +++
include/keys/asymmetric-type.h | 15 ++++-
3 files changed, 110 insertions(+), 3 deletions(-)
diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index 9f2165b..d9416df 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -416,6 +416,94 @@ void unregister_asymmetric_key_parser(struct asymmetric_key_parser *parser)
}
EXPORT_SYMBOL_GPL(unregister_asymmetric_key_parser);
+/**
+ * asymmetric_key_encrypt - invoke encrypt operation on a key
+ * of the asymmetric subtype
+ * @key: key from the system keyring
+ * @input: data to be encrypted
+ * @insize: size of data to encrypt
+ * @output: output buffer
+ * @outsize: size of the output buffer. This will be updated to the actual
+ * size of encrypted data.
+ *
+ * return: 0 on success or errno on failure
+ */
+int asymmetric_key_encrypt(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize)
+{
+ struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
+
+ if (subtype && subtype->encrypt)
+ return subtype->encrypt(key, input, insize, output, outsize);
+
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(asymmetric_key_encrypt);
+
+/**
+ * asymmetric_key_decrypt - invoke decrypt operation on a key
+ * of the asymmetric subtype
+ * @key: key from the system keyring
+ * @input: data to be decrypted
+ * @insize: size of data to decrypt
+ * @output: output buffer
+ * @outsize: size of the output buffer. This will be updated to the actual
+ * size of decrypted data.
+ *
+ * return: 0 on success or errno on failure
+ */
+int asymmetric_key_decrypt(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize)
+{
+ struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
+
+ if (subtype && subtype->decrypt)
+ return subtype->decrypt(key, input, insize, output, outsize);
+
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(asymmetric_key_decrypt);
+
+/**
+ * asymmetric_key_verify_signature - invoke verify signature operation on a key
+ * of the asymmetric subtype
+ * @key: key from the system keyring
+ * @sig: signature to verify
+ *
+ * return: 0 on success or errno on failure
+ */
+int asymmetric_key_verify_signature(const struct key *key,
+ const struct public_key_signature *sig)
+{
+ struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
+
+ if (subtype && subtype->verify_signature)
+ return subtype->verify_signature(key, sig);
+
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(asymmetric_key_verify_signature);
+
+/**
+ * asymmetric_key_create_signature - invoke create signature operation on a key
+ * of the asymmetric subtype
+ * @key: key from the system keyring
+ * @sig: output signature
+ *
+ * return: 0 on success or errno on failure
+ */
+int asymmetric_key_create_signature(const struct key *key, char *data, u32 size,
+ const struct public_key_signature **sig)
+{
+ struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
+
+ if (subtype && subtype->create_signature)
+ return subtype->create_signature(key, data, size, sig);
+
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(asymmetric_key_create_signature);
+
/*
* Module stuff
*/
diff --git a/include/keys/asymmetric-subtype.h b/include/keys/asymmetric-subtype.h
index 4915d40..30f673a 100644
--- a/include/keys/asymmetric-subtype.h
+++ b/include/keys/asymmetric-subtype.h
@@ -37,6 +37,16 @@ struct asymmetric_key_subtype {
/* Verify the signature on a key of this subtype (optional) */
int (*verify_signature)(const struct key *key,
const struct public_key_signature *sig);
+
+ /* Sign data using key and return the signature (optional) */
+ int (*create_signature)(const struct key *key, char *data, u32 size,
+ const struct public_key_signature **sig);
+
+ int (*encrypt)(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize);
+
+ int (*decrypt)(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize);
};
/**
diff --git a/include/keys/asymmetric-type.h b/include/keys/asymmetric-type.h
index 59c1df9..7a571be 100644
--- a/include/keys/asymmetric-type.h
+++ b/include/keys/asymmetric-type.h
@@ -68,14 +68,23 @@ extern struct asymmetric_key_id *asymmetric_key_generate_id(const void *val_1,
size_t len_1,
const void *val_2,
size_t len_2);
+/*
+ * The payload is at the discretion of the subtype.
+ */
static inline
const struct asymmetric_key_ids *asymmetric_key_ids(const struct key *key)
{
return key->payload.data[asym_key_ids];
}
-/*
- * The payload is at the discretion of the subtype.
- */
+struct public_key_signature;
+int asymmetric_key_encrypt(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize);
+int asymmetric_key_decrypt(const struct key *key, char *input, u32 insize,
+ char *output, u32 *outsize);
+int asymmetric_key_verify_signature(const struct key *key,
+ const struct public_key_signature *sig);
+int asymmetric_key_create_signature(const struct key *key, char *data, u32 size,
+ const struct public_key_signature **sig);
#endif /* _KEYS_ASYMMETRIC_TYPE_H */
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