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-rw-r--r--crypto/asymmetric_keys/public_key.c40
-rw-r--r--crypto/asymmetric_keys/public_key.h6
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c2
3 files changed, 39 insertions, 9 deletions
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 796ce0802aa0..49ac8d848ed1 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -86,21 +86,45 @@ EXPORT_SYMBOL_GPL(public_key_destroy);
/*
* Verify a signature using a public key.
*/
-static int public_key_verify_signature(const struct key *key,
- const struct public_key_signature *sig)
+int public_key_verify_signature(const struct public_key *pk,
+ const struct public_key_signature *sig)
{
- const struct public_key *pk = key->payload.data;
+ const struct public_key_algorithm *algo;
+
+ BUG_ON(!pk);
+ BUG_ON(!pk->mpi[0]);
+ BUG_ON(!pk->mpi[1]);
+ BUG_ON(!sig);
+ BUG_ON(!sig->digest);
+ BUG_ON(!sig->mpi[0]);
+
+ algo = pk->algo;
+ if (!algo) {
+ if (pk->pkey_algo >= PKEY_ALGO__LAST)
+ return -ENOPKG;
+ algo = pkey_algo[pk->pkey_algo];
+ if (!algo)
+ return -ENOPKG;
+ }
- if (!pk->algo->verify_signature)
+ if (!algo->verify_signature)
return -ENOTSUPP;
- if (sig->nr_mpi != pk->algo->n_sig_mpi) {
+ if (sig->nr_mpi != algo->n_sig_mpi) {
pr_debug("Signature has %u MPI not %u\n",
- sig->nr_mpi, pk->algo->n_sig_mpi);
+ sig->nr_mpi, algo->n_sig_mpi);
return -EINVAL;
}
- return pk->algo->verify_signature(pk, sig);
+ return algo->verify_signature(pk, sig);
+}
+EXPORT_SYMBOL_GPL(public_key_verify_signature);
+
+static int public_key_verify_signature_2(const struct key *key,
+ const struct public_key_signature *sig)
+{
+ const struct public_key *pk = key->payload.data;
+ return public_key_verify_signature(pk, sig);
}
/*
@@ -111,6 +135,6 @@ struct asymmetric_key_subtype public_key_subtype = {
.name = "public_key",
.describe = public_key_describe,
.destroy = public_key_destroy,
- .verify_signature = public_key_verify_signature,
+ .verify_signature = public_key_verify_signature_2,
};
EXPORT_SYMBOL_GPL(public_key_subtype);
diff --git a/crypto/asymmetric_keys/public_key.h b/crypto/asymmetric_keys/public_key.h
index 5e5e35626899..5c37a22a0637 100644
--- a/crypto/asymmetric_keys/public_key.h
+++ b/crypto/asymmetric_keys/public_key.h
@@ -28,3 +28,9 @@ struct public_key_algorithm {
};
extern const struct public_key_algorithm RSA_public_key_algorithm;
+
+/*
+ * public_key.c
+ */
+extern int public_key_verify_signature(const struct public_key *pk,
+ const struct public_key_signature *sig);
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index fac574c457b3..8cb2f7075479 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -76,7 +76,7 @@ static int x509_check_signature(const struct public_key *pub,
if (ret < 0)
goto error_mpi;
- ret = pub->algo->verify_signature(pub, sig);
+ ret = public_key_verify_signature(pub, sig);
pr_debug("Cert Verification: %d\n", ret);