add

Engine.add(x, y)
Returns a ciphertext that is the sum of the two inputs. Does not consume any level.
  • Input:
    • x: int, double, complex double, array_like, Plaintext, or Ciphertext
    • y: int, double, complex double, array_like, Plaintext, or Ciphertext
    • out: optional Ciphertext
      • If out is provided, the operation is performed in-place on the out ciphertext, which must be either x or y.
      • This is only supported when both x and y are Ciphertexts
    • If one of the inputs is a scalar, its value is added to every element of the other input.
    • At least one of the inputs must be a Ciphertext.
  • Input:
    • Ciphertext

Examples

Addition of two ciphertexts 

from desilofhe import Engine

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

message1 = [1, 2, 3]
ciphertext1 = engine.encrypt(message1, public_key)

message2 = [4, 5, 6]
ciphertext2 = engine.encrypt(message2, public_key)

added = engine.add(ciphertext1, ciphertext2)

Addition of a ciphertext and a list 

from desilofhe import Engine

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

message1 = [1, 2, 3]
ciphertext1 = engine.encrypt(message1, public_key)

message2 = [4, 5, 6]
ciphertext2 = engine.encrypt(message2, public_key)

added1 = engine.add(ciphertext1, message2)
added2 = engine.add(message1, ciphertext2)

Addition of a ciphertext and a scalar 

from desilofhe import Engine

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

message1 = [1, 2, 3]
ciphertext1 = engine.encrypt(message1, public_key)

message2 = [4, 5, 6]
ciphertext2 = engine.encrypt(message2, public_key)

added1 = engine.add(ciphertext1, 2)
added2 = engine.add(2, ciphertext2)

Addition of a ciphertext and a plaintext 

from desilofhe import Engine

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

message1 = [1, 2, 3]
plaintext1 = engine.encode(message1)
ciphertext1 = engine.encrypt(plaintext1, public_key)

message2 = [4, 5, 6]
plaintext2 = engine.encode(message2)
ciphertext2 = engine.encrypt(plaintext2, public_key)

added1 = engine.add(ciphertext1, plaintext2)
added2 = engine.add(plaintext1, ciphertext2)

Addition of two ciphertexts in-place 

from desilofhe import Engine

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

message1 = [1, 2, 3]
ciphertext1 = engine.encrypt(message1, public_key)

message2 = [4, 5, 6]
ciphertext2 = engine.encrypt(message2, public_key)

engine.add(ciphertext1, ciphertext2, out=ciphertext1)

decrypted = engine.decrypt(ciphertext1, secret_key)  # [5, 7, 9]

Addition of two ciphertexts in-place with return 

from desilofhe import Engine

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

message1 = [1, 2, 3]
ciphertext1 = engine.encrypt(message1, public_key)

message2 = [4, 5, 6]
ciphertext2 = engine.encrypt(message2, public_key)

ciphertext1 = engine.add(ciphertext1, ciphertext2, out=ciphertext1)

decrypted = engine.decrypt(ciphertext1, secret_key)  # [5, 7, 9]