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Is it possible to calculate a public key from the message hash and signature?

2 Answers 2

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It is possible to create a public key from the signature. It will be equivalent to the key used to generate the signature but not necessarily identical.

You can find an example implementation here.

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  • I think you not right Sep 21, 2017 at 22:59
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    I guess that's possible. Do you have some reason to think that I'm not right? Or maybe this link will convince you. Or perhaps section 4.1.6 of this link. Sep 21, 2017 at 23:14
  • proove it please Sep 22, 2017 at 0:32
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    Read David's links. Sep 22, 2017 at 0:36
  • 2
    Read David's answer. Sep 22, 2017 at 1:37
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BIP143 implies it is possible per the No FindAndDelete example.

I think the following pseudocode would do it

pubkey = get_pubkey(generate_key())
while not verify_sig(signature, pubkey, msg_hash):
  pubkey = get_pubkey(generate_key())

and as David suggested, I suppose not necessarily identical but equivalent for signature verification purposes.

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