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@xxxxxxxxx>
---
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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