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Use always new eckey on every validation #1

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Do not keep older EC_KEY on failed attempts. Free them on both failed
attempts and successful validation. Allocate key later. Keep just ecsig
reused between verifications.

Do not keep older EC_KEY on failed attempts. Free them on both failed
attempts and successful validation. Allocate key later. Keep just ecsig
reused between verifications.
@pemensik
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It seems to me one could make fail next verification. When I send failing signature, which fails o2i_ECPublicKey() function, it would not release eckey. Next time the same key is reused, even when different algorithm should be used. I think my change fixes it without significant side-effect.

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