blake2b_tfm_ctx
struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \