chksum_ctx
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
.base.cra_ctxsize = sizeof(struct chksum_ctx),
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
struct chksum_ctx *mctx = crypto_shash_ctx(tfm);