*
*/
-#include <crypto/internal/aead.h>
+#include <crypto/internal/geniv.h>
#include <crypto/null.h>
#include <crypto/rng.h>
#include <crypto/scatterwalk.h>
#define MAX_IV_SIZE 16
-struct echainiv_request_ctx {
- struct scatterlist src[2];
- struct scatterlist dst[2];
- struct scatterlist ivbuf[2];
- struct scatterlist *ivsg;
- struct aead_givcrypt_request subreq;
-};
-
struct echainiv_ctx {
- struct crypto_aead *child;
- spinlock_t lock;
+ /* aead_geniv_ctx must be first the element */
+ struct aead_geniv_ctx geniv;
struct crypto_blkcipher *null;
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};
static DEFINE_PER_CPU(u32 [MAX_IV_SIZE / sizeof(u32)], echainiv_iv);
-static int echainiv_setkey(struct crypto_aead *tfm,
- const u8 *key, unsigned int keylen)
-{
- struct echainiv_ctx *ctx = crypto_aead_ctx(tfm);
-
- return crypto_aead_setkey(ctx->child, key, keylen);
-}
-
-static int echainiv_setauthsize(struct crypto_aead *tfm,
- unsigned int authsize)
-{
- struct echainiv_ctx *ctx = crypto_aead_ctx(tfm);
-
- return crypto_aead_setauthsize(ctx->child, authsize);
-}
-
/* We don't care if we get preempted and read/write IVs from the next CPU. */
-void echainiv_read_iv(u8 *dst, unsigned size)
+static void echainiv_read_iv(u8 *dst, unsigned size)
{
u32 *a = (u32 *)dst;
u32 __percpu *b = echainiv_iv;
}
}
-void echainiv_write_iv(const u8 *src, unsigned size)
+static void echainiv_write_iv(const u8 *src, unsigned size)
{
const u32 *a = (const u32 *)src;
u32 __percpu *b = echainiv_iv;
}
}
-static void echainiv_encrypt_compat_complete2(struct aead_request *req,
- int err)
-{
- struct echainiv_request_ctx *rctx = aead_request_ctx(req);
- struct aead_givcrypt_request *subreq = &rctx->subreq;
- struct crypto_aead *geniv;
-
- if (err == -EINPROGRESS)
- return;
-
- if (err)
- goto out;
-
- geniv = crypto_aead_reqtfm(req);
- scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0,
- crypto_aead_ivsize(geniv), 1);
-
-out:
- kzfree(subreq->giv);
-}
-
-static void echainiv_encrypt_compat_complete(
- struct crypto_async_request *base, int err)
-{
- struct aead_request *req = base->data;
-
- echainiv_encrypt_compat_complete2(req, err);
- aead_request_complete(req, err);
-}
-
static void echainiv_encrypt_complete2(struct aead_request *req, int err)
{
struct aead_request *subreq = aead_request_ctx(req);
aead_request_complete(req, err);
}
-static int echainiv_encrypt_compat(struct aead_request *req)
-{
- struct crypto_aead *geniv = crypto_aead_reqtfm(req);
- struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- struct echainiv_request_ctx *rctx = aead_request_ctx(req);
- struct aead_givcrypt_request *subreq = &rctx->subreq;
- unsigned int ivsize = crypto_aead_ivsize(geniv);
- crypto_completion_t compl;
- void *data;
- u8 *info;
- __be64 seq;
- int err;
-
- compl = req->base.complete;
- data = req->base.data;
-
- rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen);
- info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg);
-
- if (!info) {
- info = kmalloc(ivsize, req->base.flags &
- CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
- GFP_ATOMIC);
- if (!info)
- return -ENOMEM;
-
- compl = echainiv_encrypt_compat_complete;
- data = req;
- }
-
- memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq));
-
- aead_givcrypt_set_tfm(subreq, ctx->child);
- aead_givcrypt_set_callback(subreq, req->base.flags,
- req->base.complete, req->base.data);
- aead_givcrypt_set_crypt(subreq,
- scatterwalk_ffwd(rctx->src, req->src,
- req->assoclen + ivsize),
- scatterwalk_ffwd(rctx->dst, rctx->ivsg,
- ivsize),
- req->cryptlen - ivsize, req->iv);
- aead_givcrypt_set_assoc(subreq, req->src, req->assoclen);
- aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq));
-
- err = crypto_aead_givencrypt(subreq);
- if (unlikely(PageHighMem(sg_page(rctx->ivsg))))
- echainiv_encrypt_compat_complete2(req, err);
- return err;
-}
-
static int echainiv_encrypt(struct aead_request *req)
{
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
crypto_completion_t compl;
void *data;
u8 *info;
- unsigned int ivsize;
+ unsigned int ivsize = crypto_aead_ivsize(geniv);
int err;
- aead_request_set_tfm(subreq, ctx->child);
+ if (req->cryptlen < ivsize)
+ return -EINVAL;
+
+ aead_request_set_tfm(subreq, ctx->geniv.child);
compl = echainiv_encrypt_complete;
data = req;
info = req->iv;
- ivsize = crypto_aead_ivsize(geniv);
-
if (req->src != req->dst) {
- struct scatterlist src[2];
- struct scatterlist dst[2];
struct blkcipher_desc desc = {
.tfm = ctx->null,
};
err = crypto_blkcipher_encrypt(
- &desc,
- scatterwalk_ffwd(dst, req->dst,
- req->assoclen + ivsize),
- scatterwalk_ffwd(src, req->src,
- req->assoclen + ivsize),
- req->cryptlen - ivsize);
+ &desc, req->dst, req->src,
+ req->assoclen + req->cryptlen);
if (err)
return err;
}
aead_request_set_callback(subreq, req->base.flags, compl, data);
aead_request_set_crypt(subreq, req->dst, req->dst,
req->cryptlen - ivsize, info);
- aead_request_set_ad(subreq, req->assoclen + ivsize, 0);
+ aead_request_set_ad(subreq, req->assoclen + ivsize);
crypto_xor(info, ctx->salt, ivsize);
scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
return err;
}
-static int echainiv_decrypt_compat(struct aead_request *req)
-{
- struct crypto_aead *geniv = crypto_aead_reqtfm(req);
- struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- struct aead_request *subreq = aead_request_ctx(req);
- crypto_completion_t compl;
- void *data;
- unsigned int ivsize;
-
- aead_request_set_tfm(subreq, ctx->child);
-
- compl = req->base.complete;
- data = req->base.data;
-
- ivsize = crypto_aead_ivsize(geniv);
-
- aead_request_set_callback(subreq, req->base.flags, compl, data);
- aead_request_set_crypt(subreq, req->src, req->dst,
- req->cryptlen - ivsize, req->iv);
- aead_request_set_ad(subreq, req->assoclen, ivsize);
-
- scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
-
- return crypto_aead_decrypt(subreq);
-}
-
static int echainiv_decrypt(struct aead_request *req)
{
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
struct aead_request *subreq = aead_request_ctx(req);
crypto_completion_t compl;
void *data;
- unsigned int ivsize;
+ unsigned int ivsize = crypto_aead_ivsize(geniv);
- aead_request_set_tfm(subreq, ctx->child);
+ if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
+ return -EINVAL;
+
+ aead_request_set_tfm(subreq, ctx->geniv.child);
compl = req->base.complete;
data = req->base.data;
- ivsize = crypto_aead_ivsize(geniv);
-
aead_request_set_callback(subreq, req->base.flags, compl, data);
aead_request_set_crypt(subreq, req->src, req->dst,
req->cryptlen - ivsize, req->iv);
- aead_request_set_ad(subreq, req->assoclen + ivsize, 0);
+ aead_request_set_ad(subreq, req->assoclen + ivsize);
scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
if (req->src != req->dst)
return crypto_aead_decrypt(subreq);
}
-static int echainiv_encrypt_compat_first(struct aead_request *req)
+static int echainiv_init(struct crypto_tfm *tfm)
{
- struct crypto_aead *geniv = crypto_aead_reqtfm(req);
+ struct crypto_aead *geniv = __crypto_aead_cast(tfm);
struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- int err = 0;
+ int err;
- spin_lock_bh(&ctx->lock);
- if (geniv->encrypt != echainiv_encrypt_compat_first)
- goto unlock;
+ spin_lock_init(&ctx->geniv.lock);
- geniv->encrypt = echainiv_encrypt_compat;
- err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
- crypto_aead_ivsize(geniv));
-
-unlock:
- spin_unlock_bh(&ctx->lock);
+ crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));
+ err = crypto_get_default_rng();
if (err)
- return err;
-
- return echainiv_encrypt_compat(req);
-}
-
-static int echainiv_encrypt_first(struct aead_request *req)
-{
- struct crypto_aead *geniv = crypto_aead_reqtfm(req);
- struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- int err = 0;
-
- spin_lock_bh(&ctx->lock);
- if (geniv->encrypt != echainiv_encrypt_first)
- goto unlock;
+ goto out;
- geniv->encrypt = echainiv_encrypt;
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_aead_ivsize(geniv));
-
-unlock:
- spin_unlock_bh(&ctx->lock);
-
+ crypto_put_default_rng();
if (err)
- return err;
-
- return echainiv_encrypt(req);
-}
-
-static int echainiv_compat_init(struct crypto_tfm *tfm)
-{
- struct crypto_aead *geniv = __crypto_aead_cast(tfm);
- struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- int err;
-
- spin_lock_init(&ctx->lock);
-
- crypto_aead_set_reqsize(geniv, sizeof(struct echainiv_request_ctx));
-
- err = aead_geniv_init(tfm);
-
- ctx->child = geniv->child;
- geniv->child = geniv;
-
- return err;
-}
-
-static int echainiv_init(struct crypto_tfm *tfm)
-{
- struct crypto_aead *geniv = __crypto_aead_cast(tfm);
- struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
- int err;
-
- spin_lock_init(&ctx->lock);
-
- crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));
+ goto out;
ctx->null = crypto_get_default_null_skcipher();
err = PTR_ERR(ctx->null);
if (err)
goto drop_null;
- ctx->child = geniv->child;
+ ctx->geniv.child = geniv->child;
geniv->child = geniv;
out:
goto out;
}
-static void echainiv_compat_exit(struct crypto_tfm *tfm)
-{
- struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm);
-
- crypto_free_aead(ctx->child);
-}
-
static void echainiv_exit(struct crypto_tfm *tfm)
{
struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm);
- crypto_free_aead(ctx->child);
+ crypto_free_aead(ctx->geniv.child);
crypto_put_default_null_skcipher();
}
-static struct crypto_template echainiv_tmpl;
-
-static struct crypto_instance *echainiv_aead_alloc(struct rtattr **tb)
+static int echainiv_aead_create(struct crypto_template *tmpl,
+ struct rtattr **tb)
{
struct aead_instance *inst;
struct crypto_aead_spawn *spawn;
struct aead_alg *alg;
+ int err;
- inst = aead_geniv_alloc(&echainiv_tmpl, tb, 0, 0);
+ inst = aead_geniv_alloc(tmpl, tb, 0, 0);
if (IS_ERR(inst))
- goto out;
-
- if (inst->alg.ivsize < sizeof(u64) ||
- inst->alg.ivsize & (sizeof(u32) - 1) ||
- inst->alg.ivsize > MAX_IV_SIZE) {
- aead_geniv_free(inst);
- inst = ERR_PTR(-EINVAL);
- goto out;
- }
+ return PTR_ERR(inst);
spawn = aead_instance_ctx(inst);
alg = crypto_spawn_aead_alg(spawn);
- inst->alg.setkey = echainiv_setkey;
- inst->alg.setauthsize = echainiv_setauthsize;
- inst->alg.encrypt = echainiv_encrypt_first;
+ if (alg->base.cra_aead.encrypt)
+ goto done;
+
+ err = -EINVAL;
+ if (inst->alg.ivsize & (sizeof(u32) - 1) ||
+ inst->alg.ivsize > MAX_IV_SIZE)
+ goto free_inst;
+
+ inst->alg.encrypt = echainiv_encrypt;
inst->alg.decrypt = echainiv_decrypt;
inst->alg.base.cra_init = echainiv_init;
inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;
inst->alg.base.cra_ctxsize = sizeof(struct echainiv_ctx);
- inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize;
-
- if (alg->base.cra_aead.encrypt) {
- inst->alg.encrypt = echainiv_encrypt_compat_first;
- inst->alg.decrypt = echainiv_decrypt_compat;
-
- inst->alg.base.cra_init = echainiv_compat_init;
- inst->alg.base.cra_exit = echainiv_compat_exit;
- }
-
-out:
- return aead_crypto_instance(inst);
-}
+ inst->alg.base.cra_ctxsize += inst->alg.ivsize;
-static struct crypto_instance *echainiv_alloc(struct rtattr **tb)
-{
- struct crypto_instance *inst;
- int err;
-
- err = crypto_get_default_rng();
+done:
+ err = aead_register_instance(tmpl, inst);
if (err)
- return ERR_PTR(err);
-
- inst = echainiv_aead_alloc(tb);
-
- if (IS_ERR(inst))
- goto put_rng;
+ goto free_inst;
out:
- return inst;
+ return err;
-put_rng:
- crypto_put_default_rng();
+free_inst:
+ aead_geniv_free(inst);
goto out;
}
static void echainiv_free(struct crypto_instance *inst)
{
aead_geniv_free(aead_instance(inst));
- crypto_put_default_rng();
}
static struct crypto_template echainiv_tmpl = {
.name = "echainiv",
- .alloc = echainiv_alloc,
+ .create = echainiv_aead_create,
.free = echainiv_free,
.module = THIS_MODULE,
};
projects / deliverable / linux.git / blobdiff