crypto: keys - Revert "convert public key to akcipher api"

This needs to go through the security tree so I'm reverting the
patches for now.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 42 insertions, 22 deletions

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index b383629b9e62..6db4c01c6503 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -18,16 +18,24 @@
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 #include <keys/asymmetric-subtype.h>
-#include <crypto/public_key.h>
+#include "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",
@@ -35,12 +43,6 @@ 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.
  */
@@ -51,8 +53,7 @@ static void public_key_describe(const struct key *asymmetric_key,
 
 	if (key)
 		seq_printf(m, "%s.%s",
-			   pkey_id_type_name[key->id_type],
-			   pkey_algo_name[key->pkey_algo]);
+			   pkey_id_type_name[key->id_type], key->algo->name);
 }
 
 /*
@@ -61,31 +62,50 @@ 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)
-		kfree(key->key);
-	kfree(key);
+	if (key) {
+		for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
+			mpi_free(key->mpi[i]);
+		kfree(key);
+	}
 }
 EXPORT_SYMBOL_GPL(public_key_destroy);
 
 /*
  * Verify a signature using a public key.
  */
-int public_key_verify_signature(const struct public_key *pkey,
+int public_key_verify_signature(const struct public_key *pk,
 				const struct public_key_signature *sig)
 {
-	BUG_ON(!pkey);
+	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->s);
+	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 (pkey->pkey_algo >= PKEY_ALGO__LAST)
-		return -ENOPKG;
+	if (!algo->verify_signature)
+		return -ENOTSUPP;
 
-	if (!alg_verify[pkey->pkey_algo])
-		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;
+	}
 
-	return alg_verify[pkey->pkey_algo](pkey, sig);
+	return algo->verify_signature(pk, sig);
 }
 EXPORT_SYMBOL_GPL(public_key_verify_signature);