---
name: "crypto_rng_seedsize"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/crypto_rng_seedsize"
---

# crypto\_rng\_seedsize(9)

obtain seed size of RNG

## NAME

crypto\_rng\_seedsize - obtain seed size of RNG

## SYNOPSIS

**int crypto\_rng\_seedsize(struct crypto\_rng \*** *tfm***);**

## ARGUMENTS

*tfm*

cipher handle

## DESCRIPTION

The function returns the seed size for the random number generator referenced by the cipher handle. This value may be zero if the random number generator does not implement or require a reseeding. For example, the SP800-90A DRBGs implement an automated reseeding after reaching a pre-defined threshold.

## RETURN

seed size for the random number generator

## AUTHORS

**Stephan Mueller** \<smueller@chronox.de\>

Author.

**Marek Vasut** \<marek@denx.de\>

Author.

## COPYRIGHT