KEYS: Split public_key_verify_signature() and make available

[karo-tx-linux.git] / crypto / asymmetric_keys / public_key.c

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 796ce0802aa0850d2b2c7eec2106cd1f8314bbb9..49ac8d848ed162eacf0aaacf1d883fe70059ba8c 100644 (file)
--- 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);