aboutsummaryrefslogtreecommitdiff
path: root/crypto/gcm.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/gcm.c')
-rw-r--r--crypto/gcm.c171
1 files changed, 117 insertions, 54 deletions
diff --git a/crypto/gcm.c b/crypto/gcm.c
index 2f5fbba6576..b4f01793900 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -37,13 +37,20 @@ struct crypto_rfc4106_ctx {
u8 nonce[4];
};
+struct crypto_rfc4543_instance_ctx {
+ struct crypto_aead_spawn aead;
+ struct crypto_skcipher_spawn null;
+};
+
struct crypto_rfc4543_ctx {
struct crypto_aead *child;
+ struct crypto_blkcipher *null;
u8 nonce[4];
};
struct crypto_rfc4543_req_ctx {
u8 auth_tag[16];
+ u8 assocbuf[32];
struct scatterlist cipher[1];
struct scatterlist payload[2];
struct scatterlist assoc[2];
@@ -575,7 +582,7 @@ static int crypto_gcm_verify(struct aead_request *req,
crypto_xor(auth_tag, iauth_tag, 16);
scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
- return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
+ return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
}
static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
@@ -701,9 +708,8 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
int err;
algt = crypto_get_attr_type(tb);
- err = PTR_ERR(algt);
if (IS_ERR(algt))
- return ERR_PTR(err);
+ return ERR_CAST(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
@@ -711,9 +717,8 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK);
- err = PTR_ERR(ghash_alg);
if (IS_ERR(ghash_alg))
- return ERR_PTR(err);
+ return ERR_CAST(ghash_alg);
err = -ENOMEM;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
@@ -787,15 +792,13 @@ out_put_ghash:
static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
{
- int err;
const char *cipher_name;
char ctr_name[CRYPTO_MAX_ALG_NAME];
char full_name[CRYPTO_MAX_ALG_NAME];
cipher_name = crypto_attr_alg_name(tb[1]);
- err = PTR_ERR(cipher_name);
if (IS_ERR(cipher_name))
- return ERR_PTR(err);
+ return ERR_CAST(cipher_name);
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
CRYPTO_MAX_ALG_NAME)
@@ -826,20 +829,17 @@ static struct crypto_template crypto_gcm_tmpl = {
static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
{
- int err;
const char *ctr_name;
const char *ghash_name;
char full_name[CRYPTO_MAX_ALG_NAME];
ctr_name = crypto_attr_alg_name(tb[1]);
- err = PTR_ERR(ctr_name);
if (IS_ERR(ctr_name))
- return ERR_PTR(err);
+ return ERR_CAST(ctr_name);
ghash_name = crypto_attr_alg_name(tb[2]);
- err = PTR_ERR(ghash_name);
if (IS_ERR(ghash_name))
- return ERR_PTR(err);
+ return ERR_CAST(ghash_name);
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
@@ -971,17 +971,15 @@ static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
int err;
algt = crypto_get_attr_type(tb);
- err = PTR_ERR(algt);
if (IS_ERR(algt))
- return ERR_PTR(err);
+ return ERR_CAST(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
ccm_name = crypto_attr_alg_name(tb[1]);
- err = PTR_ERR(ccm_name);
if (IS_ERR(ccm_name))
- return ERR_PTR(err);
+ return ERR_CAST(ccm_name);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
@@ -1102,36 +1100,36 @@ static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
return crypto_aead_setauthsize(ctx->child, authsize);
}
-/* this is the same as crypto_authenc_chain */
-static void crypto_rfc4543_chain(struct scatterlist *head,
- struct scatterlist *sg, int chain)
+static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
{
- if (chain) {
- head->length += sg->length;
- sg = scatterwalk_sg_next(sg);
+ struct aead_request *req = areq->data;
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
+
+ if (!err) {
+ scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
+ req->cryptlen,
+ crypto_aead_authsize(aead), 1);
}
- if (sg)
- scatterwalk_sg_chain(head, 2, sg);
- else
- sg_mark_end(head);
+ aead_request_complete(req, err);
}
static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
- int enc)
+ 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 = crypto_rfc4543_reqctx(req);
struct aead_request *subreq = &rctx->subreq;
- struct scatterlist *dst = req->dst;
+ struct scatterlist *src = req->src;
struct scatterlist *cipher = rctx->cipher;
struct scatterlist *payload = rctx->payload;
struct scatterlist *assoc = rctx->assoc;
unsigned int authsize = crypto_aead_authsize(aead);
unsigned int assoclen = req->assoclen;
- struct page *dstp;
- u8 *vdst;
+ struct page *srcp;
+ u8 *vsrc;
u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
crypto_aead_alignmask(ctx->child) + 1);
@@ -1142,35 +1140,58 @@ static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
if (enc)
memset(rctx->auth_tag, 0, authsize);
else
- scatterwalk_map_and_copy(rctx->auth_tag, dst,
+ scatterwalk_map_and_copy(rctx->auth_tag, src,
req->cryptlen - authsize,
authsize, 0);
sg_init_one(cipher, rctx->auth_tag, authsize);
/* construct the aad */
- dstp = sg_page(dst);
- vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
+ srcp = sg_page(src);
+ vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
sg_init_table(payload, 2);
sg_set_buf(payload, req->iv, 8);
- crypto_rfc4543_chain(payload, dst, vdst == req->iv + 8);
+ scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
- sg_init_table(assoc, 2);
- sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
- req->assoc->offset);
- crypto_rfc4543_chain(assoc, payload, 0);
+ if (req->assoc->length == req->assoclen) {
+ sg_init_table(assoc, 2);
+ sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
+ req->assoc->offset);
+ } else {
+ BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
+
+ scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
+ req->assoclen, 0);
+
+ sg_init_table(assoc, 2);
+ sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
+ }
+ scatterwalk_crypto_chain(assoc, payload, 0, 2);
aead_request_set_tfm(subreq, ctx->child);
- aead_request_set_callback(subreq, req->base.flags, req->base.complete,
- req->base.data);
+ aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
+ req);
aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
aead_request_set_assoc(subreq, assoc, assoclen);
return 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->cryptlen - (enc ? 0 : authsize);
+ struct blkcipher_desc desc = {
+ .tfm = ctx->null,
+ };
+
+ return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
+}
+
static int crypto_rfc4543_encrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
@@ -1178,7 +1199,13 @@ static int crypto_rfc4543_encrypt(struct aead_request *req)
struct aead_request *subreq;
int err;
- subreq = crypto_rfc4543_crypt(req, 1);
+ if (req->src != req->dst) {
+ err = crypto_rfc4543_copy_src_to_dst(req, true);
+ if (err)
+ return err;
+ }
+
+ subreq = crypto_rfc4543_crypt(req, true);
err = crypto_aead_encrypt(subreq);
if (err)
return err;
@@ -1191,7 +1218,15 @@ static int crypto_rfc4543_encrypt(struct aead_request *req)
static int crypto_rfc4543_decrypt(struct aead_request *req)
{
- req = crypto_rfc4543_crypt(req, 0);
+ int err;
+
+ if (req->src != req->dst) {
+ err = crypto_rfc4543_copy_src_to_dst(req, false);
+ if (err)
+ return err;
+ }
+
+ req = crypto_rfc4543_crypt(req, false);
return crypto_aead_decrypt(req);
}
@@ -1199,16 +1234,25 @@ static int crypto_rfc4543_decrypt(struct aead_request *req)
static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
- struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
+ struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
+ struct crypto_aead_spawn *spawn = &ictx->aead;
struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_aead *aead;
+ struct crypto_blkcipher *null;
unsigned long align;
+ int err = 0;
aead = crypto_spawn_aead(spawn);
if (IS_ERR(aead))
return PTR_ERR(aead);
+ null = crypto_spawn_blkcipher(&ictx->null.base);
+ 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);
@@ -1218,6 +1262,10 @@ static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
align + 16;
return 0;
+
+err_free_aead:
+ crypto_free_aead(aead);
+ return err;
}
static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
@@ -1225,6 +1273,7 @@ static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_aead(ctx->child);
+ crypto_free_blkcipher(ctx->null);
}
static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
@@ -1233,27 +1282,27 @@ static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
struct crypto_instance *inst;
struct crypto_aead_spawn *spawn;
struct crypto_alg *alg;
+ struct crypto_rfc4543_instance_ctx *ctx;
const char *ccm_name;
int err;
algt = crypto_get_attr_type(tb);
- err = PTR_ERR(algt);
if (IS_ERR(algt))
- return ERR_PTR(err);
+ return ERR_CAST(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
ccm_name = crypto_attr_alg_name(tb[1]);
- err = PTR_ERR(ccm_name);
if (IS_ERR(ccm_name))
- return ERR_PTR(err);
+ return ERR_CAST(ccm_name);
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);
- spawn = crypto_instance_ctx(inst);
+ ctx = crypto_instance_ctx(inst);
+ spawn = &ctx->aead;
crypto_set_aead_spawn(spawn, inst);
err = crypto_grab_aead(spawn, ccm_name, 0,
crypto_requires_sync(algt->type, algt->mask));
@@ -1262,15 +1311,23 @@ static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
alg = crypto_aead_spawn_alg(spawn);
+ crypto_set_skcipher_spawn(&ctx->null, inst);
+ err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
+ CRYPTO_ALG_ASYNC);
+ if (err)
+ goto out_drop_alg;
+
+ crypto_skcipher_spawn_alg(&ctx->null);
+
err = -EINVAL;
/* We only support 16-byte blocks. */
if (alg->cra_aead.ivsize != 16)
- goto out_drop_alg;
+ goto out_drop_ecbnull;
/* Not a stream cipher? */
if (alg->cra_blocksize != 1)
- goto out_drop_alg;
+ goto out_drop_ecbnull;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
@@ -1278,7 +1335,7 @@ static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"rfc4543(%s)", alg->cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
- goto out_drop_alg;
+ goto out_drop_ecbnull;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
@@ -1305,6 +1362,8 @@ static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
out:
return inst;
+out_drop_ecbnull:
+ crypto_drop_skcipher(&ctx->null);
out_drop_alg:
crypto_drop_aead(spawn);
out_free_inst:
@@ -1315,7 +1374,11 @@ out_free_inst:
static void crypto_rfc4543_free(struct crypto_instance *inst)
{
- crypto_drop_spawn(crypto_instance_ctx(inst));
+ struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
+
+ crypto_drop_aead(&ctx->aead);
+ crypto_drop_skcipher(&ctx->null);
+
kfree(inst);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:15:13 +0000