ecdsa: add recover_from_prehash_noverify #831
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If the recovered public key isn't correct, an error occurs when comparing it to the correct public key or public key hash. Therefore, we can skip this expensive verification.
tarcieri
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If the recovered public key isn't correct, an error occurs when comparing it to the correct public key or public key hash. Therefore, we can skip this expensive verification.
See discussion in #751