参考链接

• Linux加密框架中的主要数据结构（三）_家有一希的博客-CSDN博客
• https://blog.csdn.net/CHYabc123456hh/article/details/122194754

CBC算法模板

• cbc.c - crypto/cbc.c - Linux source code (v5.15.11) - Bootlin
• CBC算法模板属性
  • 1)CBC算法模板名为"cbc"。
  • 2)CBC算法模板定义的创建实例接口为crypto_cbc_create，内部调用

• skcipher.c - crypto/skcipher.c - Linux source code (v5.15.11) - Bootlin   内存分配

/*** skcipher_alloc_instance_simple - allocate instance of simple block cipher mode** Allocate an skcipher_instance for a simple block cipher mode of operation,* e.g. cbc or ecb.  The instance context will have just a single crypto_spawn,* that for the underlying cipher.  The {min,max}_keysize, ivsize, blocksize,* alignmask, and priority are set from the underlying cipher but can be* overridden if needed.  The tfm context defaults to skcipher_ctx_simple, and* default ->setkey(), ->init(), and ->exit() methods are installed.** @tmpl: the template being instantiated* @tb: the template parameters** Return: a pointer to the new instance, or an ERR_PTR().  The caller still*	   needs to register the instance.*/struct skcipher_instance *skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb)
{u32 mask;struct skcipher_instance *inst;struct crypto_cipher_spawn *spawn;struct crypto_alg *cipher_alg;int err;err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask);if (err)return ERR_PTR(err);inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);if (!inst)return ERR_PTR(-ENOMEM);spawn = skcipher_instance_ctx(inst);err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst),crypto_attr_alg_name(tb[1]), 0, mask);if (err)goto err_free_inst;cipher_alg = crypto_spawn_cipher_alg(spawn);err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name,cipher_alg);if (err)goto err_free_inst;inst->free = skcipher_free_instance_simple;/* Default algorithm properties, can be overridden */inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize;inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask;inst->alg.base.cra_priority = cipher_alg->cra_priority;inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize;inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize;inst->alg.ivsize = cipher_alg->cra_blocksize;/* Use skcipher_ctx_simple by default, can be overridden */inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple);inst->alg.setkey = skcipher_setkey_simple;inst->alg.init = skcipher_init_tfm_simple;inst->alg.exit = skcipher_exit_tfm_simple;return inst;err_free_inst:skcipher_free_instance_simple(inst);return ERR_PTR(err);
}