def test_evaluator_galois():
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.BFV)
parms.set_poly_modulus_degree(8)
parms.set_plain_modulus(257)
coeff = sealapi.CoeffModulus.Create(8, [40, 40])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
keygen = sealapi.KeyGenerator(ctx)
public_key = sealapi.PublicKey()
keygen.create_public_key(public_key)
secret_key = keygen.secret_key()
galois_keys = sealapi.GaloisKeys()
keygen.create_galois_keys([1, 3, 5], galois_keys)
decryptor = sealapi.Decryptor(ctx, secret_key)
encryptor = sealapi.Encryptor(ctx, public_key)
evaluator = sealapi.Evaluator(ctx)
plain = sealapi.Plaintext("1x^2")
encrypted = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, encrypted)
evaluator.apply_galois_inplace(encrypted, 1, galois_keys)
decryptor.decrypt(encrypted, plain)
assert plain.to_string() == "1x^2"
out = sealapi.Ciphertext(ctx)
evaluator.apply_galois(encrypted, 3, galois_keys, out)
decryptor.decrypt(out, plain)
assert plain.to_string() == "1x^6"
def test_evaluator_multiply_many(scheme, ctx, many):
evaluator, encryptor, decryptor, relin_keys = helper_generate_evaluator(
ctx)
expected = [1] * len(many[0])
for idx in range(len(many)):
for jdx in range(len(many[idx])):
expected[jdx] *= many[idx][jdx]
cmany = []
pmany = [helper_encode(scheme, ctx, left) for left in many]
cout = sealapi.Ciphertext(ctx)
for idx in range(len(many)):
c = sealapi.Ciphertext(ctx)
encryptor.encrypt(pmany[idx], c)
cmany.append(c)
evaluator.multiply_many(cmany, relin_keys, cout)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(many[0])], expected)
def test_evaluator_exp(scheme, ctx, exp, left):
evaluator, encryptor, decryptor, relin_keys = helper_generate_evaluator(
ctx)
expected = [i**exp for i in left]
# exponentiate in place
cleft = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.exponentiate_inplace(cleft, exp, relin_keys)
out = sealapi.Plaintext()
decryptor.decrypt(cleft, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
# exponentiate
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.exponentiate(cleft, exp, relin_keys, cout)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
def _test_encryptor_symmetric_setup(encryptor):
# encrypt symmetric
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_symmetric(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == expected_value
def save_load(path):
serial = encryptor.encrypt_symmetric(plaintext)
serial.save(path)
assert Path(path).stat().st_size > 0
tmp_file(save_load)
plaintext_out.set_zero()
# zero symmetric
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero_symmetric(ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
# zero symmetric parms_id
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero_symmetric(ctx.last_parms_id(), ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
def test_scale_manually():
scheme = sealapi.SCHEME_TYPE.CKKS
ctx = helper_context_ckks(8192)
evaluator, encryptor, decryptor, _ = helper_generate_evaluator(ctx)
cleft = sealapi.Ciphertext(ctx)
cright = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, [2, 3])
pright = helper_encode(scheme, ctx, [5, 7])
encryptor.encrypt(pleft, cleft)
encryptor.encrypt(pright, cright)
evaluator.multiply(cleft, cright, cout)
evaluator.rescale_to_next_inplace(cout)
evaluator.mod_switch_to_inplace(pright, cout.parms_id())
cout.scale = pright.scale
evaluator.add_plain_inplace(cout, pright)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:2], [15, 28])
def test_evaluator_transform_ntt(scheme, ctx, left):
evaluator, encryptor, _, _ = helper_generate_evaluator(ctx)
# cipher transform ntt inplace
cleft = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
assert cleft.is_ntt_form() is False
evaluator.transform_to_ntt_inplace(cleft)
assert cleft.is_ntt_form() is True
evaluator.transform_from_ntt_inplace(cleft)
assert cleft.is_ntt_form() is False
# cipher transform ntt
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
cfinal = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
assert cleft.is_ntt_form() is False
evaluator.transform_to_ntt(cleft, cout)
assert cout.is_ntt_form() is True
evaluator.transform_from_ntt(cout, cfinal)
assert cfinal.is_ntt_form() is False
def test_evaluator_rotate_vector():
testcase = [complex(i, i) for i in range(4)]
slot_size = len(testcase)
delta = 1 << 30
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.CKKS)
poly_modulus = 2 * slot_size
parms.set_poly_modulus_degree(poly_modulus)
parms.set_plain_modulus(0)
coeff = sealapi.CoeffModulus.Create(poly_modulus, [40, 40, 40, 40])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
ctx = helper_context_ckks()
keygen = sealapi.KeyGenerator(ctx)
galois_keys = sealapi.GaloisKeys()
keygen.create_galois_keys(galois_keys)
pk = sealapi.PublicKey()
keygen.create_public_key(pk)
decryptor = sealapi.Decryptor(ctx, keygen.secret_key())
encryptor = sealapi.Encryptor(ctx, pk)
evaluator = sealapi.Evaluator(ctx)
encoder = sealapi.CKKSEncoder(ctx)
plain = sealapi.Plaintext()
encoder.encode(testcase, ctx.first_parms_id(), delta, plain)
encrypted = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, encrypted)
# inplace
steps = 1
evaluator.rotate_vector_inplace(encrypted, steps, galois_keys)
decryptor.decrypt(encrypted, plain)
decoded = encoder.decode_complex(plain)[:slot_size]
for idx in range(slot_size):
off = (idx + steps) % slot_size
assert abs(testcase[off].real - decoded[idx].real) < 0.1
assert abs(testcase[off].imag - decoded[idx].imag) < 0.1
# to another ciphertext
steps = -steps
out = sealapi.Ciphertext(ctx)
evaluator.rotate_vector(encrypted, steps, galois_keys, out)
decryptor.decrypt(out, plain)
decoded = encoder.decode_complex(plain)[:slot_size]
for idx in range(slot_size):
assert abs(testcase[idx].real - decoded[idx].real) < 0.1
assert abs(testcase[idx].imag - decoded[idx].imag) < 0.1
def test_evaluator_rotate_bfv():
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.BFV)
parms.set_poly_modulus_degree(8)
parms.set_plain_modulus(257)
coeff = sealapi.CoeffModulus.Create(8, [40, 40])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext.Create(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
keygen = sealapi.KeyGenerator(ctx)
galois_keys = keygen.galois_keys_local()
decryptor = sealapi.Decryptor(ctx, keygen.secret_key())
encryptor = sealapi.Encryptor(ctx, keygen.public_key())
evaluator = sealapi.Evaluator(ctx)
encoder = sealapi.BatchEncoder(ctx)
testcase = [1, 2, 3, 4, 5, 6, 7, 8]
# Input
# 1, 2, 3, 4,
# 5, 6, 7, 8
plain = sealapi.Plaintext()
encoder.encode(testcase, plain)
encrypted = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, encrypted)
evaluator.rotate_columns_inplace(encrypted, galois_keys)
decryptor.decrypt(encrypted, plain)
# Rotate columns
# 5, 6, 7, 8,
# 1, 2, 3, 4
assert encoder.decode_int64(plain) == [5, 6, 7, 8, 1, 2, 3, 4]
evaluator.rotate_rows_inplace(encrypted, -1, galois_keys)
decryptor.decrypt(encrypted, plain)
# Shift rows -1
# 8, 5, 6, 7,
# 4, 1, 2, 3,
assert encoder.decode_int64(plain) == [8, 5, 6, 7, 4, 1, 2, 3]
cout = sealapi.Ciphertext(ctx)
evaluator.rotate_rows(encrypted, 2, galois_keys, cout)
decryptor.decrypt(cout, plain)
# Shift rows +2
# 6, 7, 8, 5,
# 2, 3, 4, 1,
assert encoder.decode_int64(plain) == [6, 7, 8, 5, 2, 3, 4, 1]
evaluator.rotate_columns(cout, galois_keys, encrypted)
decryptor.decrypt(encrypted, plain)
# Rotate columns
# 2, 3, 4, 1,
# 6, 7, 8, 5,
assert encoder.decode_int64(plain) == [2, 3, 4, 1, 6, 7, 8, 5]
def test_evaluator_binary(scheme, ctx, left, right):
evaluator, encryptor, decryptor, _ = helper_generate_evaluator(ctx)
# binary in place
for (op, expected) in [
(evaluator.add_inplace,
[left[idx] + right[idx] for idx in range(len(left))]),
(evaluator.sub_inplace,
[left[idx] - right[idx] for idx in range(len(left))]),
(evaluator.multiply_inplace,
[left[idx] * right[idx] for idx in range(len(left))]),
]:
cleft = sealapi.Ciphertext(ctx)
cright = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
pright = helper_encode(scheme, ctx, right)
encryptor.encrypt(pleft, cleft)
encryptor.encrypt(pright, cright)
op(cleft, cright)
out = sealapi.Plaintext()
decryptor.decrypt(cleft, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
# binary
for (op, expected) in [
(evaluator.add, [left[idx] + right[idx] for idx in range(len(left))]),
(evaluator.sub, [left[idx] - right[idx] for idx in range(len(left))]),
(evaluator.multiply,
[left[idx] * right[idx] for idx in range(len(left))]),
]:
cleft = sealapi.Ciphertext(ctx)
cright = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
pright = helper_encode(scheme, ctx, right)
encryptor.encrypt(pleft, cleft)
encryptor.encrypt(pright, cright)
op(cleft, cright, cout)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
def test_evaluator_conjugate():
testcase = [complex(i, i) for i in range(32)]
slot_size = len(testcase)
delta = 1 << 30
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.CKKS)
poly_modulus = 2 * slot_size
parms.set_poly_modulus_degree(poly_modulus)
parms.set_plain_modulus(0)
coeff = sealapi.CoeffModulus.Create(poly_modulus, [40, 40, 40, 40])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext.Create(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
ctx = helper_context_ckks()
keygen = sealapi.KeyGenerator(ctx)
galois_keys = keygen.galois_keys_local()
decryptor = sealapi.Decryptor(ctx, keygen.secret_key())
encryptor = sealapi.Encryptor(ctx, keygen.public_key())
evaluator = sealapi.Evaluator(ctx)
encoder = sealapi.CKKSEncoder(ctx)
plain = sealapi.Plaintext()
encoder.encode(testcase, ctx.first_parms_id(), delta, plain)
encrypted = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, encrypted)
evaluator.complex_conjugate_inplace(encrypted, galois_keys)
decryptor.decrypt(encrypted, plain)
decoded = encoder.decode_complex(plain)[:slot_size]
for idx in range(slot_size):
assert abs(testcase[idx].real - decoded[idx].real) < 0.1
assert abs(testcase[idx].imag + decoded[idx].imag) < 0.1
out = sealapi.Ciphertext(ctx)
evaluator.complex_conjugate(encrypted, galois_keys, out)
decryptor.decrypt(out, plain)
decoded = encoder.decode_complex(plain)[:slot_size]
for idx in range(slot_size):
assert abs(testcase[idx].real - decoded[idx].real) < 0.1
assert abs(testcase[idx].imag - decoded[idx].imag) < 0.1
def test_evaluator_relin(scheme, ctx, left, right):
evaluator, encryptor, decryptor, relin_keys = helper_generate_evaluator(
ctx)
expected = [left[idx] * right[idx] for idx in range(len(left))]
# relin inplace
cleft = sealapi.Ciphertext(ctx)
cright = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
pright = helper_encode(scheme, ctx, right)
encryptor.encrypt(pleft, cleft)
encryptor.encrypt(pright, cright)
evaluator.multiply_inplace(cleft, cright)
assert cleft.size() > 2
evaluator.relinearize_inplace(cleft, relin_keys)
assert cleft.size() == 2
out = sealapi.Plaintext()
decryptor.decrypt(cleft, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
# relin
cleft = sealapi.Ciphertext(ctx)
cright = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
pright = helper_encode(scheme, ctx, right)
encryptor.encrypt(pleft, cleft)
encryptor.encrypt(pright, cright)
evaluator.multiply_inplace(cleft, cright)
assert cleft.size() > 2
evaluator.relinearize(cleft, relin_keys, cout)
assert cout.size() == 2
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
def test_valcheck(check):
ctx = helper_context_bfv(8192)
other_ctx = helper_context_ckks(8192)
invalid_ctx = helper_context_invalid()
ciphertext = sealapi.Ciphertext(ctx)
assert check(ciphertext, ctx) is True
assert check(ciphertext, other_ctx) is False
assert check(ciphertext, invalid_ctx) is False
assert sealapi.is_buffer_valid(ciphertext) is True
plaintext = sealapi.Plaintext()
assert check(plaintext, ctx) is True
assert check(plaintext, other_ctx) is True
assert check(plaintext, invalid_ctx) is False
keygen = sealapi.KeyGenerator(ctx)
pk = sealapi.PublicKey()
keygen.create_public_key(pk)
rk = sealapi.RelinKeys()
keygen.create_relin_keys(rk)
gk = sealapi.GaloisKeys()
keygen.create_galois_keys(gk)
for key in [pk, keygen.secret_key(), gk, rk]:
assert check(key, ctx) is True
assert check(key, other_ctx) is False
assert check(key, invalid_ctx) is False
assert sealapi.is_buffer_valid(key) is True
def save_load(path):
ciphertext.save(path)
save_test = sealapi.Ciphertext(ctx)
save_test.load(ctx, path)
decryptor.decrypt(save_test, plaintext)
decoded = helper_decode(scheme, ctx, plaintext)
is_close_enough(decoded[: len(testcase)], testcase)
def test_ckks_encoder(testcase):
ctx = helper_context_ckks()
encoder = sealapi.CKKSEncoder(ctx)
plaintext = sealapi.Plaintext()
encoder.encode(testcase, 2**40, plaintext)
out = encoder.decode_double(plaintext)
is_close_enough(out, testcase)
keygen = sealapi.KeyGenerator(ctx)
public_key = keygen.public_key()
secret_key = keygen.secret_key()
decryptor = sealapi.Decryptor(ctx, secret_key)
encryptor = sealapi.Encryptor(ctx, public_key, secret_key)
plaintext = sealapi.Plaintext()
ciphertext = sealapi.Ciphertext(ctx)
encoder.encode(testcase, 2**40, plaintext)
encryptor.encrypt(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
decrypted = encoder.decode_double(plaintext)
is_close_enough(decrypted, testcase)
def test_valcheck(check):
ctx = helper_context_bfv(8192)
other_ctx = helper_context_ckks(8192)
invalid_ctx = helper_context_invalid()
ciphertext = sealapi.Ciphertext(ctx)
assert check(ciphertext, ctx) is True
assert check(ciphertext, other_ctx) is False
assert check(ciphertext, invalid_ctx) is False
assert sealapi.is_buffer_valid(ciphertext) is True
plaintext = sealapi.Plaintext()
assert check(plaintext, ctx) is True
assert check(plaintext, other_ctx) is True
assert check(plaintext, invalid_ctx) is False
keygen = sealapi.KeyGenerator(ctx)
for key in [
keygen.public_key(),
keygen.secret_key(),
keygen.galois_keys_local(),
keygen.relin_keys_local(),
]:
assert check(key, ctx) is True
assert check(key, other_ctx) is False
assert check(key, invalid_ctx) is False
assert sealapi.is_buffer_valid(key) is True
def test_evaluator_plain(scheme, ctx, left):
evaluator, encryptor, decryptor, _ = helper_generate_evaluator(ctx)
# plain op in place
for (op, plain, expected) in [
(evaluator.add_plain_inplace, [100] * len(left),
[100 + v for v in left]),
(evaluator.sub_plain_inplace, [5] * len(left), [v - 5 for v in left]),
(evaluator.multiply_plain_inplace, [2] * len(left),
[2 * v for v in left]),
]:
cleft = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
op(cleft, helper_encode(scheme, ctx, plain))
out = sealapi.Plaintext()
decryptor.decrypt(cleft, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
# plain op
for (op, plain, expected) in [
(evaluator.add_plain, [100] * len(left), [100 + v for v in left]),
(evaluator.sub_plain, [5] * len(left), [v - 5 for v in left]),
(evaluator.multiply_plain, [2] * len(left), [2 * v for v in left]),
]:
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
op(cleft, helper_encode(scheme, ctx, plain), cout)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
def _test_encryptor_pk_setup(encryptor):
ciphertext = sealapi.Ciphertext(ctx)
plaintext = sealapi.Plaintext()
batchenc.encode(batch, plaintext)
encryptor.encrypt(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert batchenc.decode_int64(plaintext_out)[:len(batch)] == batch
plaintext_out.set_zero()
def test_ciphertext(testcase, scheme, ctx):
poly_modulus_degree = helper_poly_modulus_degree(ctx)
ctx_data = ctx.key_context_data()
parms = ctx_data.parms()
coeff_mod_count = len(parms.coeff_modulus())
keygen = sealapi.KeyGenerator(ctx)
ciphertext = sealapi.Ciphertext(ctx)
plaintext = helper_encode(scheme, ctx, testcase)
encryptor = sealapi.Encryptor(ctx, keygen.public_key())
decryptor = sealapi.Decryptor(ctx, keygen.secret_key())
encryptor.encrypt(plaintext, ciphertext)
assert len(ciphertext.parms_id()) > 0
assert ciphertext.scale > 0
assert ciphertext.coeff_modulus_size() == coeff_mod_count - 1
assert ciphertext.poly_modulus_degree() == poly_modulus_degree
assert ciphertext.int_array().size() > 0
assert ciphertext.size() == 2
assert ciphertext.size_capacity() == 2
assert ciphertext.is_transparent() is False
assert ciphertext.is_ntt_form() is (scheme == sealapi.SCHEME_TYPE.CKKS)
tmp = NamedTemporaryFile()
ciphertext.save(tmp.name)
save_test = sealapi.Ciphertext(ctx)
save_test.load(ctx, tmp.name)
decryptor.decrypt(save_test, plaintext)
decoded = helper_decode(scheme, ctx, plaintext)
is_close_enough(decoded[: len(testcase)], testcase)
ciphertext.resize(ctx, 10)
assert ciphertext.size() == 10
assert ciphertext.size_capacity() == 10
ciphertext.reserve(15)
assert ciphertext.size() == 10
assert ciphertext.size_capacity() == 15
def _test_encryptor_pk_setup(encryptor):
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert batchenc.decode_int64(plaintext_out)[: len(batch)] == batch
plaintext_out.set_zero()
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero(ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert batchenc.decode_int64(plaintext_out)[: len(batch)] == [0] * len(batch)
plaintext_out.set_zero()
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero(ctx.last_parms_id(), ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert batchenc.decode_int64(plaintext_out)[: len(batch)] == [0] * len(batch)
plaintext_out.set_zero()
def _test_encryptor_pk_setup(encryptor):
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == expected_value
plaintext_out.set_zero()
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero(ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
plaintext_out.set_zero()
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero(ctx.last_parms_id(), ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
plaintext_out.set_zero()
def test_evaluator_unary(scheme, ctx, left):
evaluator, encryptor, decryptor, _ = helper_generate_evaluator(ctx)
# unary in place
for (op, expected) in [
(evaluator.negate_inplace, [-v for v in left]),
(evaluator.square_inplace, [v * v for v in left]),
(evaluator.mod_switch_to_next_inplace, left),
]:
cleft = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
op(cleft)
out = sealapi.Plaintext()
decryptor.decrypt(cleft, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
# unary
for (op, expected) in [
(evaluator.negate, [-v for v in left]),
(evaluator.square, [v * v for v in left]),
(evaluator.mod_switch_to_next, left),
]:
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
op(cleft, cout)
out = sealapi.Plaintext()
decryptor.decrypt(cout, out)
out = helper_decode(scheme, ctx, out)
is_close_enough(out[:len(left)], expected)
def _test_encryptor_symmetric_setup(encryptor):
# encrypt symmetric
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_symmetric(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == expected_value
tmp = NamedTemporaryFile()
serial = encryptor.encrypt_symmetric(plaintext)
serial.save(tmp.name)
assert Path(tmp.name).stat().st_size > 0
plaintext_out.set_zero()
# zero symmetric
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero_symmetric(ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
tmp = NamedTemporaryFile()
serial = encryptor.encrypt_zero_symmetric()
serial.save(tmp.name)
assert Path(tmp.name).stat().st_size > 0
plaintext_out.set_zero()
# zero symmetric parms_id
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt_zero_symmetric(ctx.last_parms_id(), ciphertext)
plaintext_out = sealapi.Plaintext()
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == 0
tmp = NamedTemporaryFile()
serial = encryptor.encrypt_zero_symmetric(ctx.last_parms_id())
serial.save(tmp.name)
assert Path(tmp.name).stat().st_size > 0
def test_decryptor():
poly_modulus_degree = 4096
plain_modulus = 1024
ctx = helper_context_bfv(poly_modulus_degree, plain_modulus)
keygen = sealapi.KeyGenerator(ctx)
intenc = sealapi.IntegerEncoder(ctx)
public_key = keygen.public_key()
secret_key = keygen.secret_key()
decryptor = sealapi.Decryptor(ctx, secret_key)
encryptor = sealapi.Encryptor(ctx, public_key, secret_key)
expected_value = 1234
plaintext = intenc.encode(expected_value)
ciphertext = sealapi.Ciphertext(ctx)
encryptor.encrypt(plaintext, ciphertext)
plaintext_out = sealapi.Plaintext()
assert decryptor.invariant_noise_budget(ciphertext) > 0
decryptor.decrypt(ciphertext, plaintext_out)
assert intenc.decode_int64(plaintext_out) == expected_value
def test_evaluator_mod_switch():
scheme = sealapi.SCHEME_TYPE.BFV
parms = sealapi.EncryptionParameters(scheme)
parms.set_poly_modulus_degree(128)
parms.set_plain_modulus(1 << 6)
coeff = sealapi.CoeffModulus.Create(128, [30, 30, 30])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext.Create(parms, True, sealapi.SEC_LEVEL_TYPE.NONE)
intenc = sealapi.IntegerEncoder(ctx)
keygen = sealapi.KeyGenerator(ctx)
public_key = keygen.public_key()
secret_key = keygen.secret_key()
decryptor = sealapi.Decryptor(ctx, secret_key)
encryptor = sealapi.Encryptor(ctx, public_key)
evaluator = sealapi.Evaluator(ctx)
# cphertext mod switch to next
expected_value = 1234
plain = intenc.encode(expected_value)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_next_inplace(enc)
after = decryptor.invariant_noise_budget(enc)
assert before > after
decryptor.decrypt(enc, out)
assert intenc.decode_int64(out) == expected_value
# ciphertext mod switch to next
plain = intenc.encode(expected_value)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_next(enc, cout)
after = decryptor.invariant_noise_budget(cout)
assert before > after
decryptor.decrypt(cout, out)
assert intenc.decode_int64(out) == expected_value
# cphertext mod switch to inplace
parms_id = ctx.last_parms_id()
plain = intenc.encode(expected_value)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_inplace(enc, parms_id)
after = decryptor.invariant_noise_budget(enc)
assert before > after
decryptor.decrypt(enc, out)
assert intenc.decode_int64(out) == expected_value
assert enc.parms_id() == parms_id
# ciphertext mod switch to
parms_id = ctx.last_parms_id()
plain = intenc.encode(expected_value)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to(enc, parms_id, cout)
after = decryptor.invariant_noise_budget(cout)
assert before > after
decryptor.decrypt(cout, out)
assert intenc.decode_int64(out) == expected_value
assert cout.parms_id() == parms_id
pol_str = "1x^3 + 1x^1 + 3"
# plaintext mod switch to next inplace
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.first_parms_id())
assert plain.is_ntt_form() is True
evaluator.mod_switch_to_next_inplace(plain)
assert plain.parms_id() != ctx.first_parms_id()
# plaintext mod switch to next inplace failure
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.last_parms_id())
assert plain.is_ntt_form() is True
with pytest.raises(BaseException):
evaluator.mod_switch_to_next_inplace(plain)
# plaintext mod switch to inplace
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.first_parms_id())
assert plain.is_ntt_form() is True
evaluator.mod_switch_to_inplace(plain, ctx.last_parms_id())
assert plain.parms_id() == ctx.last_parms_id()
# plaintext mod switch to next
plain = sealapi.Plaintext(pol_str)
plain_out = sealapi.Plaintext()
evaluator.transform_to_ntt(plain, ctx.first_parms_id(), plain_out)
assert plain_out.is_ntt_form() is True
plain_next = sealapi.Plaintext()
evaluator.mod_switch_to_next(plain_out, plain_next)
assert plain_out.parms_id() == ctx.first_parms_id()
assert plain_next.parms_id() != ctx.first_parms_id()
# plaintext mod switch to
plain = sealapi.Plaintext(pol_str)
plain_out = sealapi.Plaintext()
evaluator.transform_to_ntt(plain, ctx.first_parms_id(), plain_out)
assert plain_out.is_ntt_form() is True
plain_next = sealapi.Plaintext()
evaluator.mod_switch_to(plain_out, ctx.last_parms_id(), plain_next)
assert plain_out.parms_id() == ctx.first_parms_id()
assert plain_next.parms_id() == ctx.last_parms_id()
def test_evaluator_mod_switch():
poly_modulus_degree = 8192
plain_modulus = 1032193
ctx = helper_context_bfv(poly_modulus_degree, plain_modulus)
batchenc = sealapi.BatchEncoder(ctx)
keygen = sealapi.KeyGenerator(ctx)
public_key = sealapi.PublicKey()
keygen.create_public_key(public_key)
secret_key = keygen.secret_key()
decryptor = sealapi.Decryptor(ctx, secret_key)
encryptor = sealapi.Encryptor(ctx, public_key)
evaluator = sealapi.Evaluator(ctx)
# cphertext mod switch to next
expected_value = [1, 2, 3, 4, 5]
plain = sealapi.Plaintext()
batchenc.encode(expected_value, plain)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_next_inplace(enc)
after = decryptor.invariant_noise_budget(enc)
assert before > after
decryptor.decrypt(enc, out)
assert batchenc.decode_int64(out)[:len(expected_value)] == expected_value
# ciphertext mod switch to next
expected_value = [1, 2, 3, 4, 5]
plain = sealapi.Plaintext()
batchenc.encode(expected_value, plain)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_next(enc, cout)
after = decryptor.invariant_noise_budget(cout)
assert before > after
decryptor.decrypt(cout, out)
assert batchenc.decode_int64(out)[:len(expected_value)] == expected_value
# cphertext mod switch to inplace
parms_id = ctx.last_parms_id()
expected_value = [1, 2, 3, 4, 5]
plain = sealapi.Plaintext()
batchenc.encode(expected_value, plain)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to_inplace(enc, parms_id)
after = decryptor.invariant_noise_budget(enc)
assert before > after
decryptor.decrypt(enc, out)
assert batchenc.decode_int64(out)[:len(expected_value)] == expected_value
assert enc.parms_id() == parms_id
# ciphertext mod switch to
parms_id = ctx.last_parms_id()
expected_value = [1, 2, 3, 4, 5]
plain = sealapi.Plaintext()
batchenc.encode(expected_value, plain)
out = sealapi.Plaintext()
enc = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
encryptor.encrypt(plain, enc)
before = decryptor.invariant_noise_budget(enc)
evaluator.mod_switch_to(enc, parms_id, cout)
after = decryptor.invariant_noise_budget(cout)
assert before > after
decryptor.decrypt(cout, out)
assert batchenc.decode_int64(out)[:len(expected_value)] == expected_value
assert cout.parms_id() == parms_id
pol_str = "1x^3 + 1x^1 + 3"
# plaintext mod switch to next inplace
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.first_parms_id())
assert plain.is_ntt_form() is True
evaluator.mod_switch_to_next_inplace(plain)
assert plain.parms_id() != ctx.first_parms_id()
# plaintext mod switch to next inplace failure
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.last_parms_id())
assert plain.is_ntt_form() is True
with pytest.raises(BaseException):
evaluator.mod_switch_to_next_inplace(plain)
# plaintext mod switch to inplace
plain = sealapi.Plaintext(pol_str)
evaluator.transform_to_ntt_inplace(plain, ctx.first_parms_id())
assert plain.is_ntt_form() is True
evaluator.mod_switch_to_inplace(plain, ctx.last_parms_id())
assert plain.parms_id() == ctx.last_parms_id()
# plaintext mod switch to next
plain = sealapi.Plaintext(pol_str)
plain_out = sealapi.Plaintext()
evaluator.transform_to_ntt(plain, ctx.first_parms_id(), plain_out)
assert plain_out.is_ntt_form() is True
plain_next = sealapi.Plaintext()
evaluator.mod_switch_to_next(plain_out, plain_next)
assert plain_out.parms_id() == ctx.first_parms_id()
assert plain_next.parms_id() != ctx.first_parms_id()
# plaintext mod switch to
plain = sealapi.Plaintext(pol_str)
plain_out = sealapi.Plaintext()
evaluator.transform_to_ntt(plain, ctx.first_parms_id(), plain_out)
assert plain_out.is_ntt_form() is True
plain_next = sealapi.Plaintext()
evaluator.mod_switch_to(plain_out, ctx.last_parms_id(), plain_next)
assert plain_out.parms_id() == ctx.first_parms_id()
assert plain_next.parms_id() == ctx.last_parms_id()
def test_evaluator_rescale(scheme, ctx, left):
evaluator, encryptor, _, relin_keys = helper_generate_evaluator(ctx)
# cipher rescale to next in place
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.square(cleft, cout)
evaluator.relinearize_inplace(cout, relin_keys)
before = cout.scale
evaluator.rescale_to_next_inplace(cout)
after = cout.scale
assert after < before
# cipher rescale to next
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
cfinal = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.square(cleft, cout)
evaluator.relinearize_inplace(cout, relin_keys)
before = cout.scale
evaluator.rescale_to_next(cout, cfinal)
after = cfinal.scale
assert after < before
# cipher rescale to last in place
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.square(cleft, cout)
evaluator.relinearize_inplace(cout, relin_keys)
before = cout.scale
evaluator.rescale_to_inplace(cout, ctx.last_parms_id())
after = cout.scale
assert after < before
# cipher rescale to last
cleft = sealapi.Ciphertext(ctx)
cout = sealapi.Ciphertext(ctx)
cfinal = sealapi.Ciphertext(ctx)
pleft = helper_encode(scheme, ctx, left)
encryptor.encrypt(pleft, cleft)
evaluator.square(cleft, cout)
evaluator.relinearize_inplace(cout, relin_keys)
before = cout.scale
evaluator.rescale_to(cout, ctx.last_parms_id(), cfinal)
after = cfinal.scale
assert after < before
