[PATCH 6/8] KEYS: Allow the public_key struct to hold a private key [ver #2]

From: David Howells
Date: Thu Jun 23 2016 - 09:49:34 EST


Put a flag in the public_key struct to indicate if the structure is holding
a private key. The private key must be held ASN.1 encoded in the format
specified in RFC 3447 A.1.2. This is the form required by crypto/rsa.c.

The software encryption subtype's verification and query functions then
need to select the appropriate crypto function to set the key.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

crypto/asymmetric_keys/public_key.c | 14 ++++++++++++--
include/crypto/public_key.h | 1 +
2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index a48a47a1dff0..a29ca01a41a0 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -113,7 +113,12 @@ static int software_key_query(const struct kernel_pkey_params *params,
if (IS_ERR(tfm))
return PTR_ERR(tfm);

- ret = crypto_akcipher_set_pub_key(tfm, pkey->key, pkey->keylen);
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
if (ret < 0)
goto error_free_tfm;

@@ -184,7 +189,12 @@ int public_key_verify_signature(const struct public_key *pkey,
if (!req)
goto error_free_tfm;

- ret = crypto_akcipher_set_pub_key(tfm, pkey->key, pkey->keylen);
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
if (ret)
goto error_free_req;

diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index c46140d3729c..c5e569b2a73e 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -25,6 +25,7 @@
struct public_key {
void *key;
u32 keylen;
+ bool key_is_private;
const char *id_type;
const char *pkey_algo;
};