xxhash64_tfm_ctx
struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);
struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
.cra_ctxsize = sizeof(struct xxhash64_tfm_ctx),