1 files changed, 394 insertions, 6 deletions

diff --git a/crypto/aead.c b/crypto/aead.c
index 84a3501fb478..3a6f3f52c7c7 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -12,14 +12,17 @@
  *
  */
 
-#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/rtnetlink.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)
 {
@@ -53,25 +56,54 @@ static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
         return aead->setkey(tfm, key, 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(crt->base, authsize);
+                if (err)
+                        return err;
+        }
+
+        crypto_aead_crt(crt->base)->authsize = authsize;
+        crt->authsize = authsize;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
+
 static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
                                         u32 mask)
 {
         return alg->cra_ctxsize;
 }
 
+static int no_givcrypt(struct aead_givcrypt_request *req)
+{
+        return -ENOSYS;
+}
+
 static int crypto_init_aead_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->authsize, alg->ivsize) > PAGE_SIZE / 8)
+        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->authsize;
+        crt->authsize = alg->maxauthsize;
 
         return 0;
 }
@@ -83,9 +115,12 @@ static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
         struct aead_alg *aead = &alg->cra_aead;
 
         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, "authsize     : %u\n", aead->authsize);
+        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 = {
@@ -97,5 +132,358 @@ 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, "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        : %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);
+
+static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
+{
+        struct rtattr *tb[3];
+        struct {
+                struct rtattr attr;
+                struct crypto_attr_type data;
+        } ptype;
+        struct {
+                struct rtattr attr;
+                struct crypto_attr_alg data;
+        } palg;
+        struct crypto_template *tmpl;
+        struct crypto_instance *inst;
+        struct crypto_alg *larval;
+        const char *geniv;
+        int err;
+
+        larval = crypto_larval_lookup(alg->cra_driver_name,
+                                      CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
+                                      CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
+        err = PTR_ERR(larval);
+        if (IS_ERR(larval))
+                goto out;
+
+        err = -EAGAIN;
+        if (!crypto_is_larval(larval))
+                goto drop_larval;
+
+        ptype.attr.rta_len = sizeof(ptype);
+        ptype.attr.rta_type = CRYPTOA_TYPE;
+        ptype.data.type = type | CRYPTO_ALG_GENIV;
+        /* GENIV tells the template that we're making a default geniv. */
+        ptype.data.mask = mask | CRYPTO_ALG_GENIV;
+        tb[0] = &ptype.attr;
+
+        palg.attr.rta_len = sizeof(palg);
+        palg.attr.rta_type = CRYPTOA_ALG;
+        /* Must use the exact name to locate ourselves. */
+        memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
+        tb[1] = &palg.attr;
+
+        tb[2] = NULL;
+
+        geniv = alg->cra_aead.geniv;
+
+        tmpl = crypto_lookup_template(geniv);
+        err = -ENOENT;
+        if (!tmpl)
+                goto kill_larval;
+
+        inst = tmpl->alloc(tb);
+        err = PTR_ERR(inst);
+        if (IS_ERR(inst))
+                goto put_tmpl;
+
+        if ((err = crypto_register_instance(tmpl, inst))) {
+                tmpl->free(inst);
+                goto put_tmpl;
+        }
+
+        /* Redo the lookup to use the instance we just registered. */
+        err = -EAGAIN;
+
+put_tmpl:
+        crypto_tmpl_put(tmpl);
+kill_larval:
+        crypto_larval_kill(larval);
+drop_larval:
+        crypto_mod_put(larval);
+out:
+        crypto_mod_put(alg);
+        return err;
+}
+
+static struct crypto_alg *crypto_lookup_aead(const char *name, u32 type,
+                                             u32 mask)
+{
+        struct crypto_alg *alg;
+
+        alg = crypto_alg_mod_lookup(name, type, mask);
+        if (IS_ERR(alg))
+                return alg;
+
+        if (alg->cra_type == &crypto_aead_type)
+                return alg;
+
+        if (!alg->cra_aead.ivsize)
+                return alg;
+
+        return ERR_PTR(crypto_nivaead_default(alg, type, mask));
+}
+
+int crypto_grab_aead(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);
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        alg = crypto_lookup_aead(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;
+}
+EXPORT_SYMBOL_GPL(crypto_grab_aead);
+
+struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
+{
+        struct crypto_tfm *tfm;
+        int err;
+
+        type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
+        type |= CRYPTO_ALG_TYPE_AEAD;
+        mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        for (;;) {
+                struct crypto_alg *alg;
+
+                alg = crypto_lookup_aead(alg_name, type, mask);
+                if (IS_ERR(alg)) {
+                        err = PTR_ERR(alg);
+                        goto err;
+                }
+
+                tfm = __crypto_alloc_tfm(alg, type, mask);
+                if (!IS_ERR(tfm))
+                        return __crypto_aead_cast(tfm);
+
+                crypto_mod_put(alg);
+                err = PTR_ERR(tfm);
+
+err:
+                if (err != -EAGAIN)
+                        break;
+                if (signal_pending(current)) {
+                        err = -EINTR;
+                        break;
+                }
+        }
+
+        return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_aead);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");