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Generate rotation keys for a secret key

Source: R/eval-key-map.R
eval_rotate_key_gen.Rd

Standalone wrapper around the CryptoContext::EvalRotateKeyGen(privateKey, indexList) C++ method. Populates the CryptoContext's internal automorphism key registry for the supplied rotation indices so that eval_rotate() can consume them.

Usage

eval_rotate_key_gen(cc, sk, index_list)

Arguments

cc

A CryptoContext.

sk

A PrivateKey whose tag will be used to key the generated rotation keys in the cc's internal registry.

index_list

Integer vector of rotation indices.

Value

NULL, invisibly.

Details

key_gen() folds this into its rotations = ... argument as a convenience for fresh keypairs. The standalone wrapper is the right entry point when the secret key already exists — for example as the lead-party rotation-key generation step in a multi-party rotation protocol, where subsequent parties contribute via multi_eval_at_index_key_gen().