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Added the function EVP_MD_CTX_get_size_ex() which checks for XOF and does a ctx get rather than just returning EVP_MD_size(). SHAKE did not have a get_ctx_params() so that had to be added to return the xoflen. Added a helper function EVP_MD_xof() EVP_MD_CTX_size() was just an aliased macro for EVP_MD_size(), so to keep it the same I added an extra function. EVP_MD_size() always returns 0 for SHAKE now, since it caches the value of md_size at the time of an EVP_MD_fetch(). This is probably better than returning the incorrect initial value it was before e.g (16 for SHAKE128) and returning tht always instead of the set xoflen. Note BLAKE2B uses "size" instead of "xoflen" to do a similar thing. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/25285) |
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