crypto: KEYS: convert public key and digsig asym to the akcipher api

This patch converts the module verification code to the new akcipher API.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 22 insertions, 42 deletions

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 6db4c01c6503..b383629b9e62 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -18,24 +18,16 @@
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 #include <keys/asymmetric-subtype.h>
-#include "public_key.h"
+#include <crypto/public_key.h>
 
 MODULE_LICENSE("GPL");
 
 const char *const pkey_algo_name[PKEY_ALGO__LAST] = {
-	[PKEY_ALGO_DSA]		= "DSA",
-	[PKEY_ALGO_RSA]		= "RSA",
+	[PKEY_ALGO_DSA]		= "dsa",
+	[PKEY_ALGO_RSA]		= "rsa",
 };
 EXPORT_SYMBOL_GPL(pkey_algo_name);
 
-const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST] = {
-#if defined(CONFIG_PUBLIC_KEY_ALGO_RSA) || \
-	defined(CONFIG_PUBLIC_KEY_ALGO_RSA_MODULE)
-	[PKEY_ALGO_RSA]		= &RSA_public_key_algorithm,
-#endif
-};
-EXPORT_SYMBOL_GPL(pkey_algo);
-
 const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = {
 	[PKEY_ID_PGP]		= "PGP",
 	[PKEY_ID_X509]		= "X509",
@@ -43,6 +35,12 @@ const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = {
 };
 EXPORT_SYMBOL_GPL(pkey_id_type_name);
 
+static int (*alg_verify[PKEY_ALGO__LAST])(const struct public_key *pkey,
+	const struct public_key_signature *sig) = {
+	NULL,
+	rsa_verify_signature
+};
+
 /*
  * Provide a part of a description of the key for /proc/keys.
  */
@@ -53,7 +51,8 @@ static void public_key_describe(const struct key *asymmetric_key,
 
 	if (key)
 		seq_printf(m, "%s.%s",
-			   pkey_id_type_name[key->id_type], key->algo->name);
+			   pkey_id_type_name[key->id_type],
+			   pkey_algo_name[key->pkey_algo]);
 }
 
 /*
@@ -62,50 +61,31 @@ static void public_key_describe(const struct key *asymmetric_key,
 void public_key_destroy(void *payload)
 {
 	struct public_key *key = payload;
-	int i;
 
-	if (key) {
-		for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
-			mpi_free(key->mpi[i]);
-		kfree(key);
-	}
+	if (key)
+		kfree(key->key);
+	kfree(key);
 }
 EXPORT_SYMBOL_GPL(public_key_destroy);
 
 /*
  * Verify a signature using a public key.
  */
-int public_key_verify_signature(const struct public_key *pk,
+int public_key_verify_signature(const struct public_key *pkey,
 				const struct public_key_signature *sig)
 {
-	const struct public_key_algorithm *algo;
-
-	BUG_ON(!pk);
-	BUG_ON(!pk->mpi[0]);
-	BUG_ON(!pk->mpi[1]);
+	BUG_ON(!pkey);
 	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;
-	}
+	BUG_ON(!sig->s);
 
-	if (!algo->verify_signature)
-		return -ENOTSUPP;
+	if (pkey->pkey_algo >= PKEY_ALGO__LAST)
+		return -ENOPKG;
 
-	if (sig->nr_mpi != algo->n_sig_mpi) {
-		pr_debug("Signature has %u MPI not %u\n",
-			 sig->nr_mpi, algo->n_sig_mpi);
-		return -EINVAL;
-	}
+	if (!alg_verify[pkey->pkey_algo])
+		return -ENOPKG;
 
-	return algo->verify_signature(pk, sig);
+	return alg_verify[pkey->pkey_algo](pkey, sig);
 }
 EXPORT_SYMBOL_GPL(public_key_verify_signature);