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Make sharding function configurable #15

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Nov 12, 2024
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Make sharding function configurable #15

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28 changes: 27 additions & 1 deletion apple/swift_homomorphic_encryption/pir/v1/pir.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,33 @@ message PirParameters {
message KeywordPirParameters {
// The number of hash functions used.
uint64 num_hash_functions = 1;
reserved 2, 3, 4;
reserved 2, 3;
// The sharding function to use.
PIRShardingFunction sharding_function = 4;
}

// Configuration for the sharding function.
message PIRShardingFunction {
// Sharding function to use.
oneof function {
// Sharding based on SHA256 hash of the keyword.
PIRShardingFunctionSHA256 sha256 = 1;
// Sharding depends on a different usecase.
PIRShardingFunctionDoubleMod double_mod = 2;
}
}

// SHA256 sharding function.
//
// shard_id = (truncate(SHA256(keyword)) % shard_count).
message PIRShardingFunctionSHA256 {}

// Double mod sharding function.
//
// shard_id = (truncate(SHA256(keyword)) % other_shard_count) % shard_count.
message PIRShardingFunctionDoubleMod {
// Number of shards in the other usecase.
uint32 other_shard_count = 1;
}

// Encrypted PIR index.
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