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Implement oblivious index operation #284

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@ac-lan ac-lan commented Jul 15, 2022

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

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
@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. fb-exported labels Jul 15, 2022
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This pull request was exported from Phabricator. Differential Revision: D37892641

ac-lan pushed a commit to ac-lan/fbpcf that referenced this pull request Jul 21, 2022
Summary:
Pull Request resolved: facebookresearch#284

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: https://www.internalfb.com/diff/D37892641?entry_point=27

fbshipit-source-id: 0b81990773e5635c2d6c33a945c96410ae863f5a
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