summaryrefslogtreecommitdiffstats
path: root/crypto/aead.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/aead.c')
-rw-r--r--crypto/aead.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
new file mode 100644
index 0000000000..d5ba204ebd
--- /dev/null
+++ b/crypto/aead.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AEAD: Authenticated Encryption with Associated Data
+ *
+ * This file provides API support for AEAD algorithms.
+ *
+ * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/internal/aead.h>
+#include <linux/cryptouser.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <net/netlink.h>
+
+#include "internal.h"
+
+static inline struct crypto_istat_aead *aead_get_stat(struct aead_alg *alg)
+{
+#ifdef CONFIG_CRYPTO_STATS
+ return &alg->stat;
+#else
+ return NULL;
+#endif
+}
+
+static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ unsigned long alignmask = crypto_aead_alignmask(tfm);
+ int ret;
+ u8 *buffer, *alignbuffer;
+ unsigned long absize;
+
+ absize = keylen + alignmask;
+ buffer = kmalloc(absize, GFP_ATOMIC);
+ if (!buffer)
+ return -ENOMEM;
+
+ alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+ memcpy(alignbuffer, key, keylen);
+ ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
+ memset(alignbuffer, 0, keylen);
+ kfree(buffer);
+ return ret;
+}
+
+int crypto_aead_setkey(struct crypto_aead *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ unsigned long alignmask = crypto_aead_alignmask(tfm);
+ int err;
+
+ if ((unsigned long)key & alignmask)
+ err = setkey_unaligned(tfm, key, keylen);
+ else
+ err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
+
+ if (unlikely(err)) {
+ crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return err;
+ }
+
+ crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_aead_setkey);
+
+int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ int err;
+
+ if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
+ authsize > crypto_aead_maxauthsize(tfm))
+ return -EINVAL;
+
+ if (crypto_aead_alg(tfm)->setauthsize) {
+ err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
+ if (err)
+ return err;
+ }
+
+ tfm->authsize = authsize;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
+
+static inline int crypto_aead_errstat(struct crypto_istat_aead *istat, int err)
+{
+ if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
+ return err;
+
+ if (err && err != -EINPROGRESS && err != -EBUSY)
+ atomic64_inc(&istat->err_cnt);
+
+ return err;
+}
+
+int crypto_aead_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct aead_alg *alg = crypto_aead_alg(aead);
+ struct crypto_istat_aead *istat;
+ int ret;
+
+ istat = aead_get_stat(alg);
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ atomic64_inc(&istat->encrypt_cnt);
+ atomic64_add(req->cryptlen, &istat->encrypt_tlen);
+ }
+
+ if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
+ ret = -ENOKEY;
+ else
+ ret = alg->encrypt(req);
+
+ return crypto_aead_errstat(istat, ret);
+}
+EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
+
+int crypto_aead_decrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct aead_alg *alg = crypto_aead_alg(aead);
+ struct crypto_istat_aead *istat;
+ int ret;
+
+ istat = aead_get_stat(alg);
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ atomic64_inc(&istat->encrypt_cnt);
+ atomic64_add(req->cryptlen, &istat->encrypt_tlen);
+ }
+
+ if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
+ ret = -ENOKEY;
+ else if (req->cryptlen < crypto_aead_authsize(aead))
+ ret = -EINVAL;
+ else
+ ret = alg->decrypt(req);
+
+ return crypto_aead_errstat(istat, ret);
+}
+EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
+
+static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_aead *aead = __crypto_aead_cast(tfm);
+ struct aead_alg *alg = crypto_aead_alg(aead);
+
+ alg->exit(aead);
+}
+
+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);
+
+ crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
+
+ aead->authsize = alg->maxauthsize;
+
+ if (alg->exit)
+ aead->base.exit = crypto_aead_exit_tfm;
+
+ if (alg->init)
+ return alg->init(aead);
+
+ return 0;
+}
+
+static int __maybe_unused 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);
+
+ memset(&raead, 0, sizeof(raead));
+
+ strscpy(raead.type, "aead", sizeof(raead.type));
+ strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
+
+ raead.blocksize = alg->cra_blocksize;
+ raead.maxauthsize = aead->maxauthsize;
+ raead.ivsize = aead->ivsize;
+
+ return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
+}
+
+static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+ __maybe_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 void crypto_aead_free_instance(struct crypto_instance *inst)
+{
+ struct aead_instance *aead = aead_instance(inst);
+
+ aead->free(aead);
+}
+
+static int __maybe_unused crypto_aead_report_stat(
+ struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct aead_alg *aead = container_of(alg, struct aead_alg, base);
+ struct crypto_istat_aead *istat = aead_get_stat(aead);
+ struct crypto_stat_aead raead;
+
+ memset(&raead, 0, sizeof(raead));
+
+ strscpy(raead.type, "aead", sizeof(raead.type));
+
+ raead.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
+ raead.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
+ raead.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt);
+ raead.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
+ raead.stat_err_cnt = atomic64_read(&istat->err_cnt);
+
+ return nla_put(skb, CRYPTOCFGA_STAT_AEAD, sizeof(raead), &raead);
+}
+
+static const struct crypto_type crypto_aead_type = {
+ .extsize = crypto_alg_extsize,
+ .init_tfm = crypto_aead_init_tfm,
+ .free = crypto_aead_free_instance,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_aead_show,
+#endif
+#if IS_ENABLED(CONFIG_CRYPTO_USER)
+ .report = crypto_aead_report,
+#endif
+#ifdef CONFIG_CRYPTO_STATS
+ .report_stat = crypto_aead_report_stat,
+#endif
+ .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+ .maskset = CRYPTO_ALG_TYPE_MASK,
+ .type = CRYPTO_ALG_TYPE_AEAD,
+ .tfmsize = offsetof(struct crypto_aead, base),
+};
+
+int crypto_grab_aead(struct crypto_aead_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask)
+{
+ spawn->base.frontend = &crypto_aead_type;
+ return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_grab_aead);
+
+struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_aead);
+
+static int aead_prepare_alg(struct aead_alg *alg)
+{
+ struct crypto_istat_aead *istat = aead_get_stat(alg);
+ struct crypto_alg *base = &alg->base;
+
+ if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
+ PAGE_SIZE / 8)
+ return -EINVAL;
+
+ if (!alg->chunksize)
+ alg->chunksize = base->cra_blocksize;
+
+ base->cra_type = &crypto_aead_type;
+ base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+ base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS))
+ memset(istat, 0, sizeof(*istat));
+
+ 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);
+
+void crypto_unregister_aead(struct aead_alg *alg)
+{
+ crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_aead);
+
+int crypto_register_aeads(struct aead_alg *algs, int count)
+{
+ int i, ret;
+
+ for (i = 0; i < count; i++) {
+ ret = crypto_register_aead(&algs[i]);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (--i; i >= 0; --i)
+ crypto_unregister_aead(&algs[i]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_aeads);
+
+void crypto_unregister_aeads(struct aead_alg *algs, int count)
+{
+ int i;
+
+ for (i = count - 1; i >= 0; --i)
+ crypto_unregister_aead(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
+
+int aead_register_instance(struct crypto_template *tmpl,
+ struct aead_instance *inst)
+{
+ int err;
+
+ if (WARN_ON(!inst->free))
+ return -EINVAL;
+
+ 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)");