android - KeyPairGeneratorSpec deprecated -


keypairgeneratorspec deprecated since api 23. how handle warning?

example code:

keypairgenerator kpg = keypairgenerator.getinstance("rsa", "androidkeystore"); kpg.initialize(new keypairgeneratorspec.builder(context).build());

per documentation, should use keygenparameterspec instead. example (for rsa signing key):

keypairgenerator kpg = keypairgenerator.getinstance(         keyproperties.key_algorithm_rsa, "androidkeystore"); kpg.initialize(new keygenparameterspec.builder(         "mykey", keyproperties.purpose_sign)         .setdigests(keyproperties.digest_sha256)         .setsignaturepaddings(keyproperties.signature_padding_rsa_pss)         .build());

the additional options set digest , padding mode required. because, following crypto security practices, androidkeystore locks down ways key can used (signing vs decryption, digest , padding modes, etc.) specified set. if try use key in way didn't specify when created it, fail. failure enforced secure hardware, if device has it, if attacker roots device key can still used in defined ways.

keygenparameterspec supports creating ecdsa, aes , hmac keys, , allows place other restrictions on how keys can used. example, if use setuserauthenticationrequired method, impossible use key unless user around authenticate themselves.


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