[gnutls-devel] GnuTLS | DRBG: Remove all traces of FIPS 140-2 continuous self test (!820)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/nettle/int/drbg-aes.c:

>  		memset(seed, 0, DRBG_AES_SEED_SIZE);
>  	}
>  
> -	/* Throw the first block generated. FIPS 140-2 requirement (see 
> -	 * the continuous random number generator test in 4.9.2)
> -	 */
> -	if (ctx->prev_block_present == 0) {
> -		INCREMENT(sizeof(ctx->v), ctx->v);
> -		aes256_encrypt(&ctx->key, AES_BLOCK_SIZE, ctx->prev_block, ctx->v);
> -
> -		ctx->prev_block_present = 1;
> -	}
> -

To my understanding, the test is still mentioned in [FIPS140-2 document, section 4.9.2](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.140-2.pdf). However the [newest implementation guide](https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Module-Validation-Program/documents/fips140-2/FIPS1402IG.pdf) in section 9.8 claims:

> In view of the considerations stated above, the requirement to pass the CRNGT is interpreted as follows.
> The SP-800-90A-compliant DRBGs are not required to perform the test as described in AS.09.42 and AS.09.43

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