roll

Rotation Key-Based Roll

GLEngine.roll(ciphertext, rotation_key, shift, axis)

Roll the input ciphertext to the higher indices along a specified axis by the given shift value. Does not consume any level.

• Input:
  • GLCiphertext
  • GLRotationKey
  • shift: int
  • axis: int
    • 0: roll along the batch dimension
    • 1: roll along the width dimension
    • 2: roll along the height dimension
• Output:
  • GLCiphertext

import numpy as np

from desilofhe import GLEngine

engine = GLEngine()
secret_key = engine.create_secret_key()
rotation_key = engine.create_rotation_key(secret_key)

message = np.ones(engine.shape)
ciphertext = engine.encrypt(message, secret_key)
rotated_ciphertext = engine.roll(ciphertext, rotation_key, shift=1, axis=0)

Plaintext Rotation

GLEngine.roll(plaintext, shift, axis)

Rotates the input plaintext to the height indices along a specified axis by the given shift value.

• Input:
  • GLPlaintext
  • shift: int
  • axis: int
    • 0: roll along the batch dimension
    • 1: roll along the width dimension
    • 2: roll along the height dimension
• Output:
  • GLPlaintext

import numpy as np

from desilofhe import GLEngine

engine = GLEngine()

message = np.ones(engine.shape)
plaintext = engine.encode(message)
rotated_plaintext = engine.roll(plaintext, shift=1, axis=2)