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453431a549
As said by Linus: A symmetric naming is only helpful if it implies symmetries in use. Otherwise it's actively misleading. In "kzalloc()", the z is meaningful and an important part of what the caller wants. In "kzfree()", the z is actively detrimental, because maybe in the future we really _might_ want to use that "memfill(0xdeadbeef)" or something. The "zero" part of the interface isn't even _relevant_. The main reason that kzfree() exists is to clear sensitive information that should not be leaked to other future users of the same memory objects. Rename kzfree() to kfree_sensitive() to follow the example of the recently added kvfree_sensitive() and make the intention of the API more explicit. In addition, memzero_explicit() is used to clear the memory to make sure that it won't get optimized away by the compiler. The renaming is done by using the command sequence: git grep -w --name-only kzfree |\ xargs sed -i 's/kzfree/kfree_sensitive/' followed by some editing of the kfree_sensitive() kerneldoc and adding a kzfree backward compatibility macro in slab.h. [akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h] [akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more] Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Joe Perches <joe@perches.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1169 lines
30 KiB
C
1169 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GCM: Galois/Counter Mode.
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*
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* Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
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*/
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#include <crypto/gf128mul.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/internal/hash.h>
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#include <crypto/null.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/gcm.h>
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#include <crypto/hash.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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struct gcm_instance_ctx {
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struct crypto_skcipher_spawn ctr;
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struct crypto_ahash_spawn ghash;
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};
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struct crypto_gcm_ctx {
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struct crypto_skcipher *ctr;
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struct crypto_ahash *ghash;
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};
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struct crypto_rfc4106_ctx {
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struct crypto_aead *child;
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u8 nonce[4];
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};
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struct crypto_rfc4106_req_ctx {
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struct scatterlist src[3];
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struct scatterlist dst[3];
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struct aead_request subreq;
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};
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struct crypto_rfc4543_instance_ctx {
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struct crypto_aead_spawn aead;
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};
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struct crypto_rfc4543_ctx {
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struct crypto_aead *child;
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struct crypto_sync_skcipher *null;
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u8 nonce[4];
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};
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struct crypto_rfc4543_req_ctx {
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struct aead_request subreq;
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};
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struct crypto_gcm_ghash_ctx {
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unsigned int cryptlen;
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struct scatterlist *src;
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int (*complete)(struct aead_request *req, u32 flags);
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};
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struct crypto_gcm_req_priv_ctx {
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u8 iv[16];
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u8 auth_tag[16];
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u8 iauth_tag[16];
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struct scatterlist src[3];
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struct scatterlist dst[3];
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struct scatterlist sg;
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struct crypto_gcm_ghash_ctx ghash_ctx;
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union {
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struct ahash_request ahreq;
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struct skcipher_request skreq;
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} u;
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};
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static struct {
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u8 buf[16];
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struct scatterlist sg;
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} *gcm_zeroes;
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static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
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static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
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struct aead_request *req)
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{
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unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
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return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
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}
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static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_ahash *ghash = ctx->ghash;
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struct crypto_skcipher *ctr = ctx->ctr;
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struct {
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be128 hash;
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u8 iv[16];
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struct crypto_wait wait;
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struct scatterlist sg[1];
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struct skcipher_request req;
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} *data;
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int err;
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crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(ctr, key, keylen);
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if (err)
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return err;
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data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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crypto_init_wait(&data->wait);
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sg_init_one(data->sg, &data->hash, sizeof(data->hash));
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skcipher_request_set_tfm(&data->req, ctr);
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skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
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CRYPTO_TFM_REQ_MAY_BACKLOG,
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crypto_req_done,
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&data->wait);
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skcipher_request_set_crypt(&data->req, data->sg, data->sg,
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sizeof(data->hash), data->iv);
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err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
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&data->wait);
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if (err)
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goto out;
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crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
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crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
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out:
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kfree_sensitive(data);
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return err;
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}
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static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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return crypto_gcm_check_authsize(authsize);
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}
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static void crypto_gcm_init_common(struct aead_request *req)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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__be32 counter = cpu_to_be32(1);
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struct scatterlist *sg;
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memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
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memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
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memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
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sg_init_table(pctx->src, 3);
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sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
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sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
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if (sg != pctx->src + 1)
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sg_chain(pctx->src, 2, sg);
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if (req->src != req->dst) {
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sg_init_table(pctx->dst, 3);
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sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
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sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
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if (sg != pctx->dst + 1)
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sg_chain(pctx->dst, 2, sg);
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}
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}
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static void crypto_gcm_init_crypt(struct aead_request *req,
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unsigned int cryptlen)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct skcipher_request *skreq = &pctx->u.skreq;
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struct scatterlist *dst;
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dst = req->src == req->dst ? pctx->src : pctx->dst;
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skcipher_request_set_tfm(skreq, ctx->ctr);
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skcipher_request_set_crypt(skreq, pctx->src, dst,
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cryptlen + sizeof(pctx->auth_tag),
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pctx->iv);
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}
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static inline unsigned int gcm_remain(unsigned int len)
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{
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len &= 0xfU;
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return len ? 16 - len : 0;
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}
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static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
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static int gcm_hash_update(struct aead_request *req,
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crypto_completion_t compl,
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struct scatterlist *src,
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unsigned int len, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ahash_request *ahreq = &pctx->u.ahreq;
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ahash_request_set_callback(ahreq, flags, compl, req);
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ahash_request_set_crypt(ahreq, src, NULL, len);
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return crypto_ahash_update(ahreq);
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}
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static int gcm_hash_remain(struct aead_request *req,
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unsigned int remain,
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crypto_completion_t compl, u32 flags)
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{
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return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
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}
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static int gcm_hash_len(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ahash_request *ahreq = &pctx->u.ahreq;
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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be128 lengths;
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lengths.a = cpu_to_be64(req->assoclen * 8);
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lengths.b = cpu_to_be64(gctx->cryptlen * 8);
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memcpy(pctx->iauth_tag, &lengths, 16);
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sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
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ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
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ahash_request_set_crypt(ahreq, &pctx->sg,
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pctx->iauth_tag, sizeof(lengths));
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return crypto_ahash_finup(ahreq);
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}
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static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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return gctx->complete(req, flags);
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}
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static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_len_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
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{
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return gcm_hash_len(req, flags) ?:
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gcm_hash_len_continue(req, flags);
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}
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static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_crypt_remain_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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unsigned int remain;
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remain = gcm_remain(gctx->cryptlen);
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if (remain)
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return gcm_hash_remain(req, remain,
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gcm_hash_crypt_remain_done, flags) ?:
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gcm_hash_crypt_remain_continue(req, flags);
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return gcm_hash_crypt_remain_continue(req, flags);
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}
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static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_crypt_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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if (gctx->cryptlen)
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return gcm_hash_update(req, gcm_hash_crypt_done,
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gctx->src, gctx->cryptlen, flags) ?:
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gcm_hash_crypt_continue(req, flags);
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return gcm_hash_crypt_remain_continue(req, flags);
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}
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static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_assoc_remain_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
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{
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unsigned int remain;
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remain = gcm_remain(req->assoclen);
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if (remain)
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return gcm_hash_remain(req, remain,
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gcm_hash_assoc_remain_done, flags) ?:
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gcm_hash_assoc_remain_continue(req, flags);
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return gcm_hash_assoc_remain_continue(req, flags);
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}
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static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_assoc_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
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{
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if (req->assoclen)
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return gcm_hash_update(req, gcm_hash_assoc_done,
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req->src, req->assoclen, flags) ?:
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gcm_hash_assoc_continue(req, flags);
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return gcm_hash_assoc_remain_continue(req, flags);
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}
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static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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if (err)
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goto out;
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err = gcm_hash_init_continue(req, 0);
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if (err == -EINPROGRESS)
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return;
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out:
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aead_request_complete(req, err);
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}
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static int gcm_hash(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ahash_request *ahreq = &pctx->u.ahreq;
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
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ahash_request_set_tfm(ahreq, ctx->ghash);
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ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
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return crypto_ahash_init(ahreq) ?:
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gcm_hash_init_continue(req, flags);
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}
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static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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u8 *auth_tag = pctx->auth_tag;
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crypto_xor(auth_tag, pctx->iauth_tag, 16);
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scatterwalk_map_and_copy(auth_tag, req->dst,
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req->assoclen + req->cryptlen,
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crypto_aead_authsize(aead), 1);
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return 0;
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}
|
|
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static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
|
|
|
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gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
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gctx->cryptlen = req->cryptlen;
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gctx->complete = gcm_enc_copy_hash;
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|
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return gcm_hash(req, flags);
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}
|
|
|
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static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
|
|
|
|
if (err)
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|
goto out;
|
|
|
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err = gcm_encrypt_continue(req, 0);
|
|
if (err == -EINPROGRESS)
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|
return;
|
|
|
|
out:
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|
aead_request_complete(req, err);
|
|
}
|
|
|
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static int crypto_gcm_encrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
|
|
struct skcipher_request *skreq = &pctx->u.skreq;
|
|
u32 flags = aead_request_flags(req);
|
|
|
|
crypto_gcm_init_common(req);
|
|
crypto_gcm_init_crypt(req, req->cryptlen);
|
|
skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
|
|
|
|
return crypto_skcipher_encrypt(skreq) ?:
|
|
gcm_encrypt_continue(req, flags);
|
|
}
|
|
|
|
static int crypto_gcm_verify(struct aead_request *req)
|
|
{
|
|
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
u8 *auth_tag = pctx->auth_tag;
|
|
u8 *iauth_tag = pctx->iauth_tag;
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
unsigned int cryptlen = req->cryptlen - authsize;
|
|
|
|
crypto_xor(auth_tag, iauth_tag, 16);
|
|
scatterwalk_map_and_copy(iauth_tag, req->src,
|
|
req->assoclen + cryptlen, authsize, 0);
|
|
return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
|
|
}
|
|
|
|
static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
|
|
if (!err)
|
|
err = crypto_gcm_verify(req);
|
|
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
|
|
{
|
|
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
|
|
struct skcipher_request *skreq = &pctx->u.skreq;
|
|
struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
|
|
|
|
crypto_gcm_init_crypt(req, gctx->cryptlen);
|
|
skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
|
|
return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
|
|
}
|
|
|
|
static int crypto_gcm_decrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
|
|
struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
u32 flags = aead_request_flags(req);
|
|
|
|
cryptlen -= authsize;
|
|
|
|
crypto_gcm_init_common(req);
|
|
|
|
gctx->src = sg_next(pctx->src);
|
|
gctx->cryptlen = cryptlen;
|
|
gctx->complete = gcm_dec_hash_continue;
|
|
|
|
return gcm_hash(req, flags);
|
|
}
|
|
|
|
static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct aead_instance *inst = aead_alg_instance(tfm);
|
|
struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
|
|
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
|
|
struct crypto_skcipher *ctr;
|
|
struct crypto_ahash *ghash;
|
|
unsigned long align;
|
|
int err;
|
|
|
|
ghash = crypto_spawn_ahash(&ictx->ghash);
|
|
if (IS_ERR(ghash))
|
|
return PTR_ERR(ghash);
|
|
|
|
ctr = crypto_spawn_skcipher(&ictx->ctr);
|
|
err = PTR_ERR(ctr);
|
|
if (IS_ERR(ctr))
|
|
goto err_free_hash;
|
|
|
|
ctx->ctr = ctr;
|
|
ctx->ghash = ghash;
|
|
|
|
align = crypto_aead_alignmask(tfm);
|
|
align &= ~(crypto_tfm_ctx_alignment() - 1);
|
|
crypto_aead_set_reqsize(tfm,
|
|
align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
|
|
max(sizeof(struct skcipher_request) +
|
|
crypto_skcipher_reqsize(ctr),
|
|
sizeof(struct ahash_request) +
|
|
crypto_ahash_reqsize(ghash)));
|
|
|
|
return 0;
|
|
|
|
err_free_hash:
|
|
crypto_free_ahash(ghash);
|
|
return err;
|
|
}
|
|
|
|
static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
crypto_free_ahash(ctx->ghash);
|
|
crypto_free_skcipher(ctx->ctr);
|
|
}
|
|
|
|
static void crypto_gcm_free(struct aead_instance *inst)
|
|
{
|
|
struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
|
|
|
|
crypto_drop_skcipher(&ctx->ctr);
|
|
crypto_drop_ahash(&ctx->ghash);
|
|
kfree(inst);
|
|
}
|
|
|
|
static int crypto_gcm_create_common(struct crypto_template *tmpl,
|
|
struct rtattr **tb,
|
|
const char *ctr_name,
|
|
const char *ghash_name)
|
|
{
|
|
u32 mask;
|
|
struct aead_instance *inst;
|
|
struct gcm_instance_ctx *ctx;
|
|
struct skcipher_alg *ctr;
|
|
struct hash_alg_common *ghash;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
ctx = aead_instance_ctx(inst);
|
|
|
|
err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
|
|
ghash_name, 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
ghash = crypto_spawn_ahash_alg(&ctx->ghash);
|
|
|
|
err = -EINVAL;
|
|
if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
|
|
ghash->digestsize != 16)
|
|
goto err_free_inst;
|
|
|
|
err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
|
|
ctr_name, 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
|
|
|
|
/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
|
|
err = -EINVAL;
|
|
if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
|
|
crypto_skcipher_alg_ivsize(ctr) != 16 ||
|
|
ctr->base.cra_blocksize != 1)
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"gcm_base(%s,%s)", ctr->base.cra_driver_name,
|
|
ghash->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = (ghash->base.cra_priority +
|
|
ctr->base.cra_priority) / 2;
|
|
inst->alg.base.cra_blocksize = 1;
|
|
inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
|
|
ctr->base.cra_alignmask;
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
|
|
inst->alg.ivsize = GCM_AES_IV_SIZE;
|
|
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
|
|
inst->alg.maxauthsize = 16;
|
|
inst->alg.init = crypto_gcm_init_tfm;
|
|
inst->alg.exit = crypto_gcm_exit_tfm;
|
|
inst->alg.setkey = crypto_gcm_setkey;
|
|
inst->alg.setauthsize = crypto_gcm_setauthsize;
|
|
inst->alg.encrypt = crypto_gcm_encrypt;
|
|
inst->alg.decrypt = crypto_gcm_decrypt;
|
|
|
|
inst->free = crypto_gcm_free;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
crypto_gcm_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
const char *cipher_name;
|
|
char ctr_name[CRYPTO_MAX_ALG_NAME];
|
|
|
|
cipher_name = crypto_attr_alg_name(tb[1]);
|
|
if (IS_ERR(cipher_name))
|
|
return PTR_ERR(cipher_name);
|
|
|
|
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
return -ENAMETOOLONG;
|
|
|
|
return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
|
|
}
|
|
|
|
static int crypto_gcm_base_create(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
const char *ctr_name;
|
|
const char *ghash_name;
|
|
|
|
ctr_name = crypto_attr_alg_name(tb[1]);
|
|
if (IS_ERR(ctr_name))
|
|
return PTR_ERR(ctr_name);
|
|
|
|
ghash_name = crypto_attr_alg_name(tb[2]);
|
|
if (IS_ERR(ghash_name))
|
|
return PTR_ERR(ghash_name);
|
|
|
|
return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
|
|
}
|
|
|
|
static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
|
|
struct crypto_aead *child = ctx->child;
|
|
|
|
if (keylen < 4)
|
|
return -EINVAL;
|
|
|
|
keylen -= 4;
|
|
memcpy(ctx->nonce, key + keylen, 4);
|
|
|
|
crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
|
crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
return crypto_aead_setkey(child, key, keylen);
|
|
}
|
|
|
|
static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
|
|
unsigned int authsize)
|
|
{
|
|
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
|
|
int err;
|
|
|
|
err = crypto_rfc4106_check_authsize(authsize);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_aead_setauthsize(ctx->child, authsize);
|
|
}
|
|
|
|
static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
|
|
{
|
|
struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct aead_request *subreq = &rctx->subreq;
|
|
struct crypto_aead *child = ctx->child;
|
|
struct scatterlist *sg;
|
|
u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
|
|
crypto_aead_alignmask(child) + 1);
|
|
|
|
scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
|
|
|
|
memcpy(iv, ctx->nonce, 4);
|
|
memcpy(iv + 4, req->iv, 8);
|
|
|
|
sg_init_table(rctx->src, 3);
|
|
sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
|
|
sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
|
|
if (sg != rctx->src + 1)
|
|
sg_chain(rctx->src, 2, sg);
|
|
|
|
if (req->src != req->dst) {
|
|
sg_init_table(rctx->dst, 3);
|
|
sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
|
|
sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
|
|
if (sg != rctx->dst + 1)
|
|
sg_chain(rctx->dst, 2, sg);
|
|
}
|
|
|
|
aead_request_set_tfm(subreq, child);
|
|
aead_request_set_callback(subreq, req->base.flags, req->base.complete,
|
|
req->base.data);
|
|
aead_request_set_crypt(subreq, rctx->src,
|
|
req->src == req->dst ? rctx->src : rctx->dst,
|
|
req->cryptlen, iv);
|
|
aead_request_set_ad(subreq, req->assoclen - 8);
|
|
|
|
return subreq;
|
|
}
|
|
|
|
static int crypto_rfc4106_encrypt(struct aead_request *req)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_ipsec_check_assoclen(req->assoclen);
|
|
if (err)
|
|
return err;
|
|
|
|
req = crypto_rfc4106_crypt(req);
|
|
|
|
return crypto_aead_encrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4106_decrypt(struct aead_request *req)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_ipsec_check_assoclen(req->assoclen);
|
|
if (err)
|
|
return err;
|
|
|
|
req = crypto_rfc4106_crypt(req);
|
|
|
|
return crypto_aead_decrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct aead_instance *inst = aead_alg_instance(tfm);
|
|
struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
|
|
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
|
|
struct crypto_aead *aead;
|
|
unsigned long align;
|
|
|
|
aead = crypto_spawn_aead(spawn);
|
|
if (IS_ERR(aead))
|
|
return PTR_ERR(aead);
|
|
|
|
ctx->child = aead;
|
|
|
|
align = crypto_aead_alignmask(aead);
|
|
align &= ~(crypto_tfm_ctx_alignment() - 1);
|
|
crypto_aead_set_reqsize(
|
|
tfm,
|
|
sizeof(struct crypto_rfc4106_req_ctx) +
|
|
ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
|
|
align + 24);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
crypto_free_aead(ctx->child);
|
|
}
|
|
|
|
static void crypto_rfc4106_free(struct aead_instance *inst)
|
|
{
|
|
crypto_drop_aead(aead_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
|
|
static int crypto_rfc4106_create(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
u32 mask;
|
|
struct aead_instance *inst;
|
|
struct crypto_aead_spawn *spawn;
|
|
struct aead_alg *alg;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
|
|
spawn = aead_instance_ctx(inst);
|
|
err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_spawn_aead_alg(spawn);
|
|
|
|
err = -EINVAL;
|
|
|
|
/* Underlying IV size must be 12. */
|
|
if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
|
|
goto err_free_inst;
|
|
|
|
/* Not a stream cipher? */
|
|
if (alg->base.cra_blocksize != 1)
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4106(%s)", alg->base.cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME ||
|
|
snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4106(%s)", alg->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
|
inst->alg.base.cra_blocksize = 1;
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
|
|
|
|
inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
|
|
inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
|
|
inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
|
|
|
|
inst->alg.init = crypto_rfc4106_init_tfm;
|
|
inst->alg.exit = crypto_rfc4106_exit_tfm;
|
|
|
|
inst->alg.setkey = crypto_rfc4106_setkey;
|
|
inst->alg.setauthsize = crypto_rfc4106_setauthsize;
|
|
inst->alg.encrypt = crypto_rfc4106_encrypt;
|
|
inst->alg.decrypt = crypto_rfc4106_decrypt;
|
|
|
|
inst->free = crypto_rfc4106_free;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
crypto_rfc4106_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
|
|
struct crypto_aead *child = ctx->child;
|
|
|
|
if (keylen < 4)
|
|
return -EINVAL;
|
|
|
|
keylen -= 4;
|
|
memcpy(ctx->nonce, key + keylen, 4);
|
|
|
|
crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
|
crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
return crypto_aead_setkey(child, key, keylen);
|
|
}
|
|
|
|
static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
|
|
unsigned int authsize)
|
|
{
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
|
|
|
|
if (authsize != 16)
|
|
return -EINVAL;
|
|
|
|
return crypto_aead_setauthsize(ctx->child, authsize);
|
|
}
|
|
|
|
static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
|
|
struct aead_request *subreq = &rctx->subreq;
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
|
|
crypto_aead_alignmask(ctx->child) + 1);
|
|
int err;
|
|
|
|
if (req->src != req->dst) {
|
|
err = crypto_rfc4543_copy_src_to_dst(req, enc);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
memcpy(iv, ctx->nonce, 4);
|
|
memcpy(iv + 4, req->iv, 8);
|
|
|
|
aead_request_set_tfm(subreq, ctx->child);
|
|
aead_request_set_callback(subreq, req->base.flags,
|
|
req->base.complete, req->base.data);
|
|
aead_request_set_crypt(subreq, req->src, req->dst,
|
|
enc ? 0 : authsize, iv);
|
|
aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
|
|
subreq->cryptlen);
|
|
|
|
return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
|
|
}
|
|
|
|
static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
unsigned int nbytes = req->assoclen + req->cryptlen -
|
|
(enc ? 0 : authsize);
|
|
SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
|
|
|
|
skcipher_request_set_sync_tfm(nreq, ctx->null);
|
|
skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
|
|
skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
|
|
|
|
return crypto_skcipher_encrypt(nreq);
|
|
}
|
|
|
|
static int crypto_rfc4543_encrypt(struct aead_request *req)
|
|
{
|
|
return crypto_ipsec_check_assoclen(req->assoclen) ?:
|
|
crypto_rfc4543_crypt(req, true);
|
|
}
|
|
|
|
static int crypto_rfc4543_decrypt(struct aead_request *req)
|
|
{
|
|
return crypto_ipsec_check_assoclen(req->assoclen) ?:
|
|
crypto_rfc4543_crypt(req, false);
|
|
}
|
|
|
|
static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct aead_instance *inst = aead_alg_instance(tfm);
|
|
struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
|
|
struct crypto_aead_spawn *spawn = &ictx->aead;
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
|
|
struct crypto_aead *aead;
|
|
struct crypto_sync_skcipher *null;
|
|
unsigned long align;
|
|
int err = 0;
|
|
|
|
aead = crypto_spawn_aead(spawn);
|
|
if (IS_ERR(aead))
|
|
return PTR_ERR(aead);
|
|
|
|
null = crypto_get_default_null_skcipher();
|
|
err = PTR_ERR(null);
|
|
if (IS_ERR(null))
|
|
goto err_free_aead;
|
|
|
|
ctx->child = aead;
|
|
ctx->null = null;
|
|
|
|
align = crypto_aead_alignmask(aead);
|
|
align &= ~(crypto_tfm_ctx_alignment() - 1);
|
|
crypto_aead_set_reqsize(
|
|
tfm,
|
|
sizeof(struct crypto_rfc4543_req_ctx) +
|
|
ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
|
|
align + GCM_AES_IV_SIZE);
|
|
|
|
return 0;
|
|
|
|
err_free_aead:
|
|
crypto_free_aead(aead);
|
|
return err;
|
|
}
|
|
|
|
static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
crypto_free_aead(ctx->child);
|
|
crypto_put_default_null_skcipher();
|
|
}
|
|
|
|
static void crypto_rfc4543_free(struct aead_instance *inst)
|
|
{
|
|
struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
|
|
|
|
crypto_drop_aead(&ctx->aead);
|
|
|
|
kfree(inst);
|
|
}
|
|
|
|
static int crypto_rfc4543_create(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
u32 mask;
|
|
struct aead_instance *inst;
|
|
struct aead_alg *alg;
|
|
struct crypto_rfc4543_instance_ctx *ctx;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
|
|
ctx = aead_instance_ctx(inst);
|
|
err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_spawn_aead_alg(&ctx->aead);
|
|
|
|
err = -EINVAL;
|
|
|
|
/* Underlying IV size must be 12. */
|
|
if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
|
|
goto err_free_inst;
|
|
|
|
/* Not a stream cipher? */
|
|
if (alg->base.cra_blocksize != 1)
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4543(%s)", alg->base.cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME ||
|
|
snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4543(%s)", alg->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
|
inst->alg.base.cra_blocksize = 1;
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
|
|
|
|
inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
|
|
inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
|
|
inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
|
|
|
|
inst->alg.init = crypto_rfc4543_init_tfm;
|
|
inst->alg.exit = crypto_rfc4543_exit_tfm;
|
|
|
|
inst->alg.setkey = crypto_rfc4543_setkey;
|
|
inst->alg.setauthsize = crypto_rfc4543_setauthsize;
|
|
inst->alg.encrypt = crypto_rfc4543_encrypt;
|
|
inst->alg.decrypt = crypto_rfc4543_decrypt;
|
|
|
|
inst->free = crypto_rfc4543_free;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
crypto_rfc4543_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_template crypto_gcm_tmpls[] = {
|
|
{
|
|
.name = "gcm_base",
|
|
.create = crypto_gcm_base_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "gcm",
|
|
.create = crypto_gcm_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "rfc4106",
|
|
.create = crypto_rfc4106_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "rfc4543",
|
|
.create = crypto_rfc4543_create,
|
|
.module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init crypto_gcm_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
|
|
if (!gcm_zeroes)
|
|
return -ENOMEM;
|
|
|
|
sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
|
|
|
|
err = crypto_register_templates(crypto_gcm_tmpls,
|
|
ARRAY_SIZE(crypto_gcm_tmpls));
|
|
if (err)
|
|
kfree(gcm_zeroes);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit crypto_gcm_module_exit(void)
|
|
{
|
|
kfree(gcm_zeroes);
|
|
crypto_unregister_templates(crypto_gcm_tmpls,
|
|
ARRAY_SIZE(crypto_gcm_tmpls));
|
|
}
|
|
|
|
subsys_initcall(crypto_gcm_module_init);
|
|
module_exit(crypto_gcm_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Galois/Counter Mode");
|
|
MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
|
|
MODULE_ALIAS_CRYPTO("gcm_base");
|
|
MODULE_ALIAS_CRYPTO("rfc4106");
|
|
MODULE_ALIAS_CRYPTO("rfc4543");
|
|
MODULE_ALIAS_CRYPTO("gcm");
|