Comments (2)
lazutkin-andrey
commented on May 30, 2024
Hi, thanks for the question!
Take a look at signing section here https://github.com/Tangem/tangem-sdk-android#sign
Also, we have a demo project https://github.com/Tangem/tangem-sdk-android/tree/master/tangem-demo
Let me know if you have other questions.
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dbaturin
commented on May 30, 2024
I'd like to add that you should provide 256 bit hash to sign with secp256k1 curve. For Ethereum you should hash your message with Keccak256.
Signature from card might not be canonical (have "high S" value) so you should also canonicalize it first, most crypto libraries can do that.
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