This entropy source can be used instead of SEED-SRC. Sample
openssl.cnf configuration is provided. It is built as a separate
provider, because it is likely to require less frequent updates than
fips provider. The same build likely can span multiple generations of
FIPS 140 standard revisions.
Note that rand-instances currently chain from public/private instances
to primary, prior to consuming the seed. Thus currently a unique ESV
needs to be obtained, and resue of jitterentropy.a certificate is not
possible as is. Separately a patch will be sent to allow for
unchaining public/private RAND instances for the purpose of reusing
ESV.
Also I do wonder if it makes sense to create a fips variant of stock
SEED-SRC entropy source, which in addition to using getrandom() also
verifies that the kernel is operating in FIPS mode and thus is likely
a validated entropy source. As in on Linux, check that
/proc/sys/crypto/fips_enabled is set to 1, and similar checks on
Windows / MacOS and so on.
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24844)
