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I don't have 50 reputation points yet, so can not comment and had to put this in as an answer... there are some interesting points here: RSA vs. DSA for SSH authentication keys


pkeyutl -sign with an RSA key (and defaulted to 'pkcs1' which really means v1_5) does steps 2-6 of EMSA-PKCS1-v1_5-ENCODE in section 9.2 of rfc3447, then step 2 of RSASSA-PKCS1-v1_5-SIGN in section 8.2. In other words it does everything but hash the data (but it does check the length of the input hash). Note that if the hash name you specify here is ...

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