/*
* AEAD: Authenticated Encryption with Associated Data
- *
+ *
* This file provides API support for AEAD algorithms.
*
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
+ * Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/rtnetlink.h>
+#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
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, "maxauthsize : %u\n", aead->maxauthsize);
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);
}
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;
+
+ crypto_mod_put(alg);
+ alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
+ mask & ~CRYPTO_ALG_TESTED);
+ if (IS_ERR(alg))
+ return alg;
+
+ if (alg->cra_type == &crypto_aead_type) {
+ if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
+ crypto_mod_put(alg);
+ alg = ERR_PTR(-ENOENT);
+ }
+ return alg;
+ }
+
+ BUG_ON(!alg->cra_aead.ivsize);
+
+ 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)");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff