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Obtain PSS salt length from provider
Rather than computing the PSS salt length again in core using ossl_rsa_ctx_to_pss_string, which calls rsa_ctx_to_pss and computes the salt length, obtain it from the provider using the OSSL_SIGNATURE_PARAM_ALGORITHM_ID param to handle the case where the interpretation of the magic constants in the provider differs from that of OpenSSL core. Add tests that verify that the rsa_pss_saltlen:max, rsa_pss_saltlen:<integer> and rsa_pss_saltlen:digest options work and put the computed digest length into the CMS_ContentInfo struct when using CMS. Do not add a test for the salt length generated by a provider when no specific rsa_pss_saltlen option is defined, since that number could change between providers and provider versions, and we want to preserve compatibility with older providers. Signed-off-by: Clemens Lang <cllang@redhat.com> Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from openssl#19724)
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