roll

Ciphertext Roll

Engine.roll(ciphertext, rotation_key, shift)

Rolls the input ciphertext to the right by the specified shift value. For example, rolling [1, 2, 3, 4] by 1 results in [4, 1, 2, 3]. In general, does not consume any level. A level is consumed only if the operation is not a multiparty computation and the ciphertext is at the maximum allowable level for a given parameter.

• Input:
  • Ciphertext
  • RotationKey
  • shift: int
• Output:
  • Ciphertext

from desilofhe import Engine

engine = Engine()
secret_key = engine.create_secret_key()
public_key = engine.create_public_key(secret_key)
rotation_key = engine.create_rotation_key(secret_key)

message = [1, 2, 3]
ciphertext = engine.encrypt(message, public_key)
rolled_ciphertext = engine.roll(ciphertext, rotation_key, shift=1)

Plaintext Roll

Engine.roll(plaintext, shift)

Rolls the input plaintext to the right by the specified shift value. For example, rolling [1, 2, 3, 4] by 1 results in [4, 1, 2, 3].

• Input:
  • Plaintext
  • shift: int
• Output:
  • Plaintext

from desilofhe import Engine

engine = Engine()

message = [1, 2, 3]
plaintext = engine.encode(message)
rolled_plaintext = engine.roll(plaintext, shift=1)