lib: rsa: add documentation to padding_pss_verify to document limitations
padding_pss_verify only works with the default pss salt setting of -2 (length to be automatically determined based on the PSS block structure) not -1 (salt length set to the maximum permissible value), which makes verifications of signatures with that saltlen fail. Until this gets implemented at least document this behaviour. Signed-off-by: NHeiko Stuebner <heiko.stuebner@theobroma-systems.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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