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Hashes used in RSA-PSS encoding (EMSA-PSS-ENCODE, see §9.1.1 in RFC 8017): - H1: Hashing the message (step 2) - H2: Hashing in the salt (step 6) - H3: Mask generation function (step 9) According to the standard: - H1 and H2 MUST be done by the same hash function - H3 is RECOMMENDED to be the same as the hash used for H1 and H2. According to the implementation: - H1 happens outside of the function call. It might or might not happen and the implementation might or might not be aware of the hash used. - H2 happens inside the function call, consistency with H1 is not enforced and might not even be possible to detect. - H3 is done with the same hash as H2 (with the exception of mbedtls_rsassa_pss_verify_ext(), which takes a dedicated parameter for the hash used in the MGF). Issues with the documentation: - The comments weren't always clear about the three hashes involved and often only mentioned two of them (which two varied from function to function). - The documentation was giving the impression that the standard recommends aligning H2 and H1 (which is not a recommendation but a must). Signed-off-by: Janos Follath <janos.follath@arm.com> |
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| psa | ||
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| CMakeLists.txt | ||