crypto: aead - Add support for new AEAD implementations

This patch adds the basic structure of the new AEAD type.  Unlike
the current version, there is no longer any concept of geniv.  IV
generation will still be carried out by wrappers but they will be
normal AEAD algorithms that simply take the IPsec sequence number
as the IV.

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

1 files changed, 137 insertions, 15 deletions

diff --git a/crypto/aead.c b/crypto/aead.c
index ebc91ea..d231e28 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -33,7 +33,6 @@ static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 			    unsigned int keylen)
 {
-	struct old_aead_alg *aead = crypto_old_aead_alg(tfm);
 	unsigned long alignmask = crypto_aead_alignmask(tfm);
 	int ret;
 	u8 *buffer, *alignbuffer;
@@ -46,7 +45,7 @@ static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
-	ret = aead->setkey(tfm, alignbuffer, keylen);
+	ret = tfm->setkey(tfm, alignbuffer, keylen);
 	memset(alignbuffer, 0, keylen);
 	kfree(buffer);
 	return ret;
@@ -55,7 +54,6 @@ static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 int crypto_aead_setkey(struct crypto_aead *tfm,
 		       const u8 *key, unsigned int keylen)
 {
-	struct old_aead_alg *aead = crypto_old_aead_alg(tfm);
 	unsigned long alignmask = crypto_aead_alignmask(tfm);
 
 	tfm = tfm->child;
@@ -63,7 +61,7 @@ int crypto_aead_setkey(struct crypto_aead *tfm,
 	if ((unsigned long)key & alignmask)
 		return setkey_unaligned(tfm, key, keylen);
 
-	return aead->setkey(tfm, key, keylen);
+	return tfm->setkey(tfm, key, keylen);
 }
 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
 
@@ -71,12 +69,11 @@ int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 {
 	int err;
 
-	if (authsize > crypto_old_aead_alg(tfm)->maxauthsize)
+	if (authsize > tfm->maxauthsize)
 		return -EINVAL;
 
-	if (crypto_old_aead_alg(tfm)->setauthsize) {
-		err = crypto_old_aead_alg(tfm)->setauthsize(
-			tfm->child, authsize);
+	if (tfm->setauthsize) {
+		err = tfm->setauthsize(tfm->child, authsize);
 		if (err)
 			return err;
 	}
@@ -145,7 +142,7 @@ static int no_givcrypt(struct aead_givcrypt_request *req)
 	return -ENOSYS;
 }
 
-static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
+static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm)
 {
 	struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead;
 	struct crypto_aead *crt = __crypto_aead_cast(tfm);
@@ -153,6 +150,8 @@ static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
 		return -EINVAL;
 
+	crt->setkey = alg->setkey;
+	crt->setauthsize = alg->setauthsize;
 	crt->encrypt = old_encrypt;
 	crt->decrypt = old_decrypt;
 	if (alg->ivsize) {
@@ -164,13 +163,34 @@ static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 	}
 	crt->child = __crypto_aead_cast(tfm);
 	crt->ivsize = alg->ivsize;
+	crt->maxauthsize = alg->maxauthsize;
 	crt->authsize = alg->maxauthsize;
 
 	return 0;
 }
 
+static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_aead *aead = __crypto_aead_cast(tfm);
+	struct aead_alg *alg = crypto_aead_alg(aead);
+
+	if (crypto_old_aead_alg(aead)->encrypt)
+		return crypto_old_aead_init_tfm(tfm);
+
+	aead->setkey = alg->setkey;
+	aead->setauthsize = alg->setauthsize;
+	aead->encrypt = alg->encrypt;
+	aead->decrypt = alg->decrypt;
+	aead->child = __crypto_aead_cast(tfm);
+	aead->ivsize = alg->ivsize;
+	aead->maxauthsize = alg->maxauthsize;
+	aead->authsize = alg->maxauthsize;
+
+	return 0;
+}
+
 #ifdef CONFIG_NET
-static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
+static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct crypto_report_aead raead;
 	struct old_aead_alg *aead = &alg->cra_aead;
@@ -191,15 +211,15 @@ nla_put_failure:
 	return -EMSGSIZE;
 }
 #else
-static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
+static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	return -ENOSYS;
 }
 #endif
 
-static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 	__attribute__ ((unused));
-static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	struct old_aead_alg *aead = &alg->cra_aead;
 
@@ -216,9 +236,9 @@ const struct crypto_type crypto_aead_type = {
 	.extsize = crypto_alg_extsize,
 	.init_tfm = crypto_aead_init_tfm,
 #ifdef CONFIG_PROC_FS
-	.show = crypto_aead_show,
+	.show = crypto_old_aead_show,
 #endif
-	.report = crypto_aead_report,
+	.report = crypto_old_aead_report,
 	.lookup = crypto_lookup_aead,
 	.maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
 	.maskset = CRYPTO_ALG_TYPE_MASK,
@@ -227,6 +247,62 @@ const struct crypto_type crypto_aead_type = {
 };
 EXPORT_SYMBOL_GPL(crypto_aead_type);
 
+#ifdef CONFIG_NET
+static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_aead raead;
+	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
+
+	strncpy(raead.type, "aead", sizeof(raead.type));
+	strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
+
+	raead.blocksize = alg->cra_blocksize;
+	raead.maxauthsize = aead->maxauthsize;
+	raead.ivsize = aead->ivsize;
+
+	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
+		    sizeof(struct crypto_report_aead), &raead))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+#else
+static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	return -ENOSYS;
+}
+#endif
+
+static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+	__attribute__ ((unused));
+static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
+
+	seq_printf(m, "type         : aead\n");
+	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
+					     "yes" : "no");
+	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
+	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
+	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
+	seq_printf(m, "geniv        : <none>\n");
+}
+
+static const struct crypto_type crypto_new_aead_type = {
+	.extsize = crypto_alg_extsize,
+	.init_tfm = crypto_aead_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_aead_show,
+#endif
+	.report = crypto_aead_report,
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.type = CRYPTO_ALG_TYPE_AEAD,
+	.tfmsize = offsetof(struct crypto_aead, base),
+};
+
 static int aead_null_givencrypt(struct aead_givcrypt_request *req)
 {
 	return crypto_aead_encrypt(&req->areq);
@@ -552,5 +628,51 @@ struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
 
+static int aead_prepare_alg(struct aead_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+
+	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	base->cra_type = &crypto_new_aead_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
+
+	return 0;
+}
+
+int crypto_register_aead(struct aead_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+	int err;
+
+	err = aead_prepare_alg(alg);
+	if (err)
+		return err;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_aead);
+
+int crypto_unregister_aead(struct aead_alg *alg)
+{
+	return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_aead);
+
+int aead_register_instance(struct crypto_template *tmpl,
+			   struct aead_instance *inst)
+{
+	int err;
+
+	err = aead_prepare_alg(&inst->alg);
+	if (err)
+		return err;
+
+	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(aead_register_instance);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");