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Add a stash of entries to PIR response #20

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fboemer merged 1 commit into from
Apr 24, 2025
Merged

Add a stash of entries to PIR response #20

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19 changes: 19 additions & 0 deletions apple/swift_homomorphic_encryption/api/pir/v1/pir.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,8 @@ message PIRRequest {
message PIRResponse {
// Encrypted replies, each of which is a ciphertext vector.
repeated apple.swift_homomorphic_encryption.v1.SerializedCiphertextVec replies = 1;
// Stash of entries with the most recent updates that have not yet reached the processed database.
StashOfEntries stash = 2;
}

// PIR OPRF Request.
Expand All @@ -109,3 +111,20 @@ message OPRFResponse {
// Proof of OPRF evaluation.
bytes proof = 2;
}

// Stash of entries.
//
// Stash is meant to be used as temporary storage until we can update the processed database.
message StashOfEntries {
// Sorted list of hashed keywords.
//
// hashed_keyword = Truncate(SHA256(keyword))
repeated uint64 hashed_keywords = 1;
// The values associated with each keyword in the `hashed_keywords` list. Must be in the same order.
repeated bytes values = 2;
// Sorted list of hashed keywords that were removed from the dataset.
//
// This list contains hashed keywords that were deleted, but may still be present in the processed database.
// hashed_keyword = Truncate(SHA256(keyword))
repeated uint64 removed_hashed_keywords = 3;
}