crypto_rfc3686_ctx
struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(parent);
struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);