[CRYPTO] aead: Add aead_geniv_alloc/aead_geniv_free
[linux-3.10.git] / crypto / aead.c
index 15335ed9010a6260e950c89c490348fe4d2aea26..9f7aca89192666e15cacc03494d75c36def2884f 100644 (file)
  *
  */
 
-#include <crypto/algapi.h>
-#include <linux/errno.h>
+#include <crypto/internal/aead.h>
+#include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 
+#include "internal.h"
+
 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
                            unsigned int keylen)
 {
@@ -55,18 +57,20 @@ static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
 
 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 {
+       struct aead_tfm *crt = crypto_aead_crt(tfm);
        int err;
 
        if (authsize > crypto_aead_alg(tfm)->maxauthsize)
                return -EINVAL;
 
        if (crypto_aead_alg(tfm)->setauthsize) {
-               err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
+               err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
                if (err)
                        return err;
        }
 
-       crypto_aead_crt(tfm)->authsize = authsize;
+       crypto_aead_crt(crt->base)->authsize = authsize;
+       crt->authsize = authsize;
        return 0;
 }
 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
@@ -90,11 +94,13 @@ static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
        if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
                return -EINVAL;
 
-       crt->setkey = setkey;
+       crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
+                     alg->setkey : setkey;
        crt->encrypt = alg->encrypt;
        crt->decrypt = alg->decrypt;
        crt->givencrypt = alg->givencrypt ?: no_givcrypt;
        crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
+       crt->base = __crypto_aead_cast(tfm);
        crt->ivsize = alg->ivsize;
        crt->authsize = alg->maxauthsize;
 
@@ -111,6 +117,7 @@ static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
        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        : %s\n", aead->geniv ?: "<built-in>");
 }
 
 const struct crypto_type crypto_aead_type = {
@@ -122,5 +129,204 @@ const struct crypto_type crypto_aead_type = {
 };
 EXPORT_SYMBOL_GPL(crypto_aead_type);
 
+static int aead_null_givencrypt(struct aead_givcrypt_request *req)
+{
+       return crypto_aead_encrypt(&req->areq);
+}
+
+static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
+{
+       return crypto_aead_decrypt(&req->areq);
+}
+
+static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+       struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
+       struct aead_tfm *crt = &tfm->crt_aead;
+
+       if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
+               return -EINVAL;
+
+       crt->setkey = setkey;
+       crt->encrypt = alg->encrypt;
+       crt->decrypt = alg->decrypt;
+       if (!alg->ivsize) {
+               crt->givencrypt = aead_null_givencrypt;
+               crt->givdecrypt = aead_null_givdecrypt;
+       }
+       crt->base = __crypto_aead_cast(tfm);
+       crt->ivsize = alg->ivsize;
+       crt->authsize = alg->maxauthsize;
+
+       return 0;
+}
+
+static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
+       __attribute__ ((unused));
+static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
+{
+       struct aead_alg *aead = &alg->cra_aead;
+
+       seq_printf(m, "type         : nivaead\n");
+       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        : %s\n", aead->geniv);
+}
+
+const struct crypto_type crypto_nivaead_type = {
+       .ctxsize = crypto_aead_ctxsize,
+       .init = crypto_init_nivaead_ops,
+#ifdef CONFIG_PROC_FS
+       .show = crypto_nivaead_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_nivaead_type);
+
+static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
+                              const char *name, u32 type, u32 mask)
+{
+       struct crypto_alg *alg;
+       int err;
+
+       type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
+       type |= CRYPTO_ALG_TYPE_AEAD;
+       mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;
+
+       alg = crypto_alg_mod_lookup(name, type, mask);
+       if (IS_ERR(alg))
+               return PTR_ERR(alg);
+
+       err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
+       crypto_mod_put(alg);
+       return err;
+}
+
+struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
+                                        struct rtattr **tb, u32 type,
+                                        u32 mask)
+{
+       const char *name;
+       struct crypto_aead_spawn *spawn;
+       struct crypto_attr_type *algt;
+       struct crypto_instance *inst;
+       struct crypto_alg *alg;
+       int err;
+
+       algt = crypto_get_attr_type(tb);
+       err = PTR_ERR(algt);
+       if (IS_ERR(algt))
+               return ERR_PTR(err);
+
+       if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
+           algt->mask)
+               return ERR_PTR(-EINVAL);
+
+       name = crypto_attr_alg_name(tb[1]);
+       err = PTR_ERR(name);
+       if (IS_ERR(name))
+               return ERR_PTR(err);
+
+       inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+       if (!inst)
+               return ERR_PTR(-ENOMEM);
+
+       spawn = crypto_instance_ctx(inst);
+
+       /* Ignore async algorithms if necessary. */
+       mask |= crypto_requires_sync(algt->type, algt->mask);
+
+       crypto_set_aead_spawn(spawn, inst);
+       err = crypto_grab_nivaead(spawn, name, type, mask);
+       if (err)
+               goto err_free_inst;
+
+       alg = crypto_aead_spawn_alg(spawn);
+
+       err = -EINVAL;
+       if (!alg->cra_aead.ivsize)
+               goto err_drop_alg;
+
+       /*
+        * This is only true if we're constructing an algorithm with its
+        * default IV generator.  For the default generator we elide the
+        * template name and double-check the IV generator.
+        */
+       if (algt->mask & CRYPTO_ALG_GENIV) {
+               if (strcmp(tmpl->name, alg->cra_aead.geniv))
+                       goto err_drop_alg;
+
+               memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+               memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
+                      CRYPTO_MAX_ALG_NAME);
+       } else {
+               err = -ENAMETOOLONG;
+               if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+                            "%s(%s)", tmpl->name, alg->cra_name) >=
+                   CRYPTO_MAX_ALG_NAME)
+                       goto err_drop_alg;
+               if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                            "%s(%s)", tmpl->name, alg->cra_driver_name) >=
+                   CRYPTO_MAX_ALG_NAME)
+                       goto err_drop_alg;
+       }
+
+       inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
+       inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
+       inst->alg.cra_priority = alg->cra_priority;
+       inst->alg.cra_blocksize = alg->cra_blocksize;
+       inst->alg.cra_alignmask = alg->cra_alignmask;
+       inst->alg.cra_type = &crypto_aead_type;
+
+       inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
+       inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
+       inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
+
+       inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
+       inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
+       inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
+       inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
+
+out:
+       return inst;
+
+err_drop_alg:
+       crypto_drop_aead(spawn);
+err_free_inst:
+       kfree(inst);
+       inst = ERR_PTR(err);
+       goto out;
+}
+EXPORT_SYMBOL_GPL(aead_geniv_alloc);
+
+void aead_geniv_free(struct crypto_instance *inst)
+{
+       crypto_drop_aead(crypto_instance_ctx(inst));
+       kfree(inst);
+}
+EXPORT_SYMBOL_GPL(aead_geniv_free);
+
+int aead_geniv_init(struct crypto_tfm *tfm)
+{
+       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct crypto_aead *aead;
+
+       aead = crypto_spawn_aead(crypto_instance_ctx(inst));
+       if (IS_ERR(aead))
+               return PTR_ERR(aead);
+
+       tfm->crt_aead.base = aead;
+       tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(aead_geniv_init);
+
+void aead_geniv_exit(struct crypto_tfm *tfm)
+{
+       crypto_free_aead(tfm->crt_aead.base);
+}
+EXPORT_SYMBOL_GPL(aead_geniv_exit);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");