DM_IMA_TABLE_HASH_ALG
const size_t hash_alg_prefix_len = strlen(DM_IMA_TABLE_HASH_ALG) + 1;
tfm = crypto_alloc_shash(DM_IMA_TABLE_HASH_ALG, 0, 0);
snprintf(digest_buf, hash_alg_prefix_len + 1, "%s:", DM_IMA_TABLE_HASH_ALG);