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This bug was initially created as a copy of Bug #2142087. I am copying this bug because this is also the case with GnuTLS.
Description of problem:
FIPS 186-4, section 5 "The RSA Digital Signature Algorithm", subsection 5.5 "PKCS #1" says:
For RSASSA-PSS […] the length (in bytes) of the salt (sLen) shall satisfy 0 ≤ sLen ≤ hLen, where hLen is the length of the hash function output block (in bytes).
Our current copy of GnuTLS does not enforce this nor report it through FIPS service indicator as an non-approved operation.
Version-Release number of selected component (if applicable):
gnutls-3.7.6-12.el9_0
How reproducible:
always
Steps to Reproduce:
1. generate RSA-PSS private key: certtool --generate-privkey --key-type=rsa-pss --bits=2048 --salt-size=33 --hash=sha256 --outfile key.pem
2. create self-signed certificate signed with the key generated at (1): GNUTLS_FORCE_FIPS_MODE=1 certtool --generate-self-signed --load-privkey key.pem --template=doc/credentials/server.tmpl --outfile cert.pem
Actual results:
Both commands succeed
Expected results:
(2) should fail or report that non-approved crypto operation has happened in the audit log message
Additional info:
GnuTLS by default use the salt length equal to the hash length (if it is truncated by RSA key size), while other standards, e.g., TPM, may impose the maximum possible salt length depending on RSA key size
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (gnutls bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2023:2522