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Implement oblivious index operation #284

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Implement oblivious index operation #284

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Commits on Jul 15, 2022

  1. Implement oblivious index operation 

    Summary:
This is needed for the concat function in AsciiString when accessing a character in the AsciiString while the index is secret.

Overloaded the [ ] operator so the index could be a secret Int object. Iterate through the AsciiString and assign the return value to be the current character if we are at the secret index. Return a signed secret Int object.

Differential Revision: D37892641

fbshipit-source-id: 128c531dccd6da5f6df824770da42994158bff01
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    Aining Liu authored and facebook-github-bot committed Jul 15, 2022
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