Does SmartPGP support RFC 6979 with (EC)DSA signing?

github-af / SmartPGP

SmartPGP is a JavaCard implementation of the OpenPGP card specifications

GNU General Public License v2.0

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Does SmartPGP support RFC 6979 with (EC)DSA signing? #18

Closed persmule closed 3 years ago

persmule commented 5 years ago

Does SmartPGP support RFC 6979 in its (EC)DSA implementation, which makes them deterministic?

breard-r commented 5 years ago

As far as I know, SmartPGP relies on the JavaCard implementation of cryptographic primitives (cf. PGPKey.java) : in this case, the signPreComputedHash method. This makes the use of RFC 6979 dependent on the choices your card manufacturer made.