aesbs_cbc_ctx
struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
const struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
.base.cra_ctxsize = sizeof(struct aesbs_cbc_ctx),