CODEWITHSUNDEEP
javacryptographydigital-signaturesmartcardjavacard
the thinker
the thinker

Reputation: 484

Elliptic point addition on Java Cards?

For Java Card 3.0.5, are there any methods/workarounds to add two discrete points together? For example, for scalar multiplication the method I found is ALG_EC_SVDP_DH_PLAIN_XY. Is there something like this for discrete point addition? I'm aware of ALG_EC_PACE_GM which does sG + H. But that isn't really discrete point addition since I would need to know some s for which sG would result in the point I need.

The reason I'm asking is because I want to make a Schnorr signature implementation (since it doesn't exist for Java Card natively) and for that I would need EC point addition.

OR ALTERNATIVELY, if anyone has any links to existing opensource implementations of the Schnorr signature for Java Card, I'd love that also.

I am aware of JCMathLib, but its rather heavy.

Upvotes: 2

Views: 202

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