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I would like to create a smart contract that would be able to decrypt some symmetrically encrypted message.

Here is the scenario:

  • Party "A" sends a message encrypted with key "123456" to VerifierContract
  • Party "B" sends a plain message with key "123456" to VerifierContract
  • VerifierContract decrypts "A" message using the key from "B".
  • if decrypted message is equal to "B" plain message, then VerifierContract takes action.

Does it make sense?

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Don't really get what you're trying to build but here's the cryptoapi.

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