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a discrepency between OpenSSL and Botan when generating SHA-512/EMSA3
signatures. In fact it turns out that the EMSA3 identifier for SHA-512
contained a typo and was incorrect.
Unfortunately this means that SHA-512/EMSA3 signatures generated by
Botan up until now will not be accepted by other implementations, and
the signatures by other implementations would not be accepted by Botan.
Currently I am not making any provision for backwards compatability with
the old incorrect hash identifier, since I am assuming/guessing that
SHA-512/EMSA3 is not a very common combination.
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