crypto: fix RSA-PSS default saltLength#39999
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+1 to treating this as a bug fix
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PR-URL: #39999 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com>
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PR-URL: #39999 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com>
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Based on my understanding of RFC 8017, when
hashAlgorithmis set butsaltLengthis not, the value ofsaltLengthassociated with the key pair should default to the digest size ofhashAlgorithm, not to0.I am not sure why OpenSSL uses
0. I suspect it is because we don't callEVP_PKEY_CTX_set_rsa_pss_keygen_saltlenand0is the least restrictive value, at least within OpenSSL. This behavior can still be restored by explicitly settingsaltLengthto0.I'd argue that this is a bug fix. If we are concerned about semverity, I could modify this PR to only affect the new options (#39927) and keep the behavior of the old options intact. Personally, I don't think it's necessary to go that route.