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Java map: domain settings for key agreement?

With the javacard.security.KeyAgreement class (Java Card 3.0.1 classic), you can conclude an EC-DH agreement. But there is no definite curve. As I understand it, the IEEE P1363 standard does not define domain parameters. So, which curve is used in the implementation of Java Card?

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It is simple: no. You must set your own parameters. It depends on the card, what type of parameters is supported. The same goes for key sizes. For JCOP (on a chip with an asymmetric coprocessor) you can be pretty sure that, for example, curves over F (p) with a maximum key size of 320 bits are supported.

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Source: https://habr.com/ru/post/1609505/

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