add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/crypto/cts.c
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@@ -78,15 +78,11 @@
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 {
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 	struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(parent);
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 	struct crypto_skcipher *child = ctx->child;
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-	int err;
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 	crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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 	crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
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 					 CRYPTO_TFM_REQ_MASK);
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-	err = crypto_skcipher_setkey(child, key, keylen);
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-	crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
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-					  CRYPTO_TFM_RES_MASK);
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-	return err;
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+	return crypto_skcipher_setkey(child, key, keylen);
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 }
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 static void cts_cbc_crypt_done(struct crypto_async_request *areq, int err)
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@@ -152,12 +148,14 @@
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 	struct skcipher_request *subreq = &rctx->subreq;
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 	int bsize = crypto_skcipher_blocksize(tfm);
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 	unsigned int nbytes = req->cryptlen;
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-	int cbc_blocks = (nbytes + bsize - 1) / bsize - 1;
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 	unsigned int offset;
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 	skcipher_request_set_tfm(subreq, ctx->child);
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-	if (cbc_blocks <= 0) {
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+	if (nbytes < bsize)
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+		return -EINVAL;
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+
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+	if (nbytes == bsize) {
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 		skcipher_request_set_callback(subreq, req->base.flags,
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 					      req->base.complete,
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 					      req->base.data);
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@@ -166,7 +164,7 @@
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 		return crypto_skcipher_encrypt(subreq);
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 	}
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-	offset = cbc_blocks * bsize;
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+	offset = rounddown(nbytes - 1, bsize);
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 	rctx->offset = offset;
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 	skcipher_request_set_callback(subreq, req->base.flags,
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@@ -244,13 +242,15 @@
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 	struct skcipher_request *subreq = &rctx->subreq;
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 	int bsize = crypto_skcipher_blocksize(tfm);
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 	unsigned int nbytes = req->cryptlen;
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-	int cbc_blocks = (nbytes + bsize - 1) / bsize - 1;
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 	unsigned int offset;
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 	u8 *space;
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 	skcipher_request_set_tfm(subreq, ctx->child);
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-	if (cbc_blocks <= 0) {
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+	if (nbytes < bsize)
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+		return -EINVAL;
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+
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+	if (nbytes == bsize) {
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 		skcipher_request_set_callback(subreq, req->base.flags,
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 					      req->base.complete,
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 					      req->base.data);
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@@ -264,10 +264,10 @@
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 	space = crypto_cts_reqctx_space(req);
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-	offset = cbc_blocks * bsize;
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+	offset = rounddown(nbytes - 1, bsize);
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 	rctx->offset = offset;
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-	if (cbc_blocks <= 1)
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+	if (offset <= bsize)
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 		memcpy(space, req->iv, bsize);
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 	else
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 		scatterwalk_map_and_copy(space, req->src, offset - 2 * bsize,
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@@ -325,21 +325,13 @@
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 {
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 	struct crypto_skcipher_spawn *spawn;
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 	struct skcipher_instance *inst;
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-	struct crypto_attr_type *algt;
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 	struct skcipher_alg *alg;
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-	const char *cipher_name;
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+	u32 mask;
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 	int err;
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-	algt = crypto_get_attr_type(tb);
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-	if (IS_ERR(algt))
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-		return PTR_ERR(algt);
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-
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-	if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
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-		return -EINVAL;
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-
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-	cipher_name = crypto_attr_alg_name(tb[1]);
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-	if (IS_ERR(cipher_name))
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-		return PTR_ERR(cipher_name);
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+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask);
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+	if (err)
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+		return err;
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 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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 	if (!inst)
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@@ -347,10 +339,8 @@
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 	spawn = skcipher_instance_ctx(inst);
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-	crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
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-	err = crypto_grab_skcipher(spawn, cipher_name, 0,
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-				   crypto_requires_sync(algt->type,
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-							algt->mask));
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+	err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
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+				   crypto_attr_alg_name(tb[1]), 0, mask);
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 	if (err)
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 		goto err_free_inst;
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@@ -358,17 +348,16 @@
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 	err = -EINVAL;
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 	if (crypto_skcipher_alg_ivsize(alg) != alg->base.cra_blocksize)
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-		goto err_drop_spawn;
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+		goto err_free_inst;
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 	if (strncmp(alg->base.cra_name, "cbc(", 4))
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-		goto err_drop_spawn;
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+		goto err_free_inst;
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 	err = crypto_inst_setname(skcipher_crypto_instance(inst), "cts",
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 				  &alg->base);
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 	if (err)
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-		goto err_drop_spawn;
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+		goto err_free_inst;
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-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
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 	inst->alg.base.cra_priority = alg->base.cra_priority;
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 	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
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 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
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@@ -390,17 +379,11 @@
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 	inst->free = crypto_cts_free;
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 	err = skcipher_register_instance(tmpl, inst);
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-	if (err)
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-		goto err_drop_spawn;
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-
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-out:
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-	return err;
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-
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-err_drop_spawn:
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-	crypto_drop_skcipher(spawn);
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+	if (err) {
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 err_free_inst:
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-	kfree(inst);
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-	goto out;
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+		crypto_cts_free(inst);
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+	}
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+	return err;
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 }
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 static struct crypto_template crypto_cts_tmpl = {
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@@ -419,7 +402,7 @@
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 	crypto_unregister_template(&crypto_cts_tmpl);
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 }
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-module_init(crypto_cts_module_init);
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+subsys_initcall(crypto_cts_module_init);
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 module_exit(crypto_cts_module_exit);
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 MODULE_LICENSE("Dual BSD/GPL");