Before trying to use it, I was misleaded by the documentation (and the
example) of the EVP_PKEY_sign() call at :
http://www.openssl.org/docs/crypto/EVP_PKEY_sign.html
I believed it was [quite] the same behavior than with
EVP_DigestSignFinal() before undestanding that the input has to be a
digest, not the app data directly.
(confirmed by reading this :
http://marc.info/?l=openssl-users&m=118150769328614&w=2)
What is not yet clear to me is :
if the input is a previously calculated digest, what is the use of the
EVP_PKEY_CTX_set_signature_md() call in the example ?
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