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fips: mention the internal jitter source in the FIPS README

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Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/25498)
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Pauli 2024-09-20 08:59:40 +10:00
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README-FIPS.md
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@ -167,6 +167,22 @@ manual page.
[fips_module(7)]: https://www.openssl.org/docs/manmaster/man7/fips_module.html
Entropy Source
==============
The FIPS provider typically relies on an external entropy source,
specified during OpenSSL build configuration (default: `os`). However, by
enabling the `enable-fips-jitter` option during configuration, an internal
jitter entropy source will be used instead. Note that this will cause
the FIPS provider to operate in a non-compliant mode unless an entropy
assessment [ESV] and validation through the [CMVP] are additionally conducted.
Note that the `enable-fips-jitter` option is only available in OpenSSL
versions 3.5 and later.
[CMVP]: https://csrc.nist.gov/projects/cryptographic-module-validation-program
[ESV]: https://csrc.nist.gov/Projects/cryptographic-module-validation-program/entropy-validations
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