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_util_galois():
with pytest.raises(BaseException):
util.GaloisTool(0)
gtool = util.GaloisTool(3)
assert gtool.get_elt_from_step(0) == 15
assert gtool.get_elts_from_steps([0, 1, -3, 2, -2, 3,
-1]) == [15, 3, 3, 9, 9, 11, 11]
assert gtool.get_elts_all() == [15, 3, 11, 9, 9]
poly_modulus_degree = 8
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.CKKS)
parms.set_poly_modulus_degree(poly_modulus_degree)
coeff = sealapi.CoeffModulus.Create(poly_modulus_degree, [17])
parms.set_coeff_modulus(coeff)
ctx = sealapi.SEALContext(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
gtool = ctx.key_context_data().galois_tool()
assert gtool.apply_galois([0, 1, 2, 3, 4, 5, 6, 7], 3, sealapi.Modulus(17),
poly_modulus_degree -
1)[:8] == [0, 14, 6, 1, 13, 7, 2, 12]
assert gtool.apply_galois_ntt([0, 1, 2, 3, 4, 5, 6, 7], 3,
poly_modulus_degree - 1)[:8] == [
4,
5,
7,
6,
1,
0,
2,
3,
]
assert 7 == util.GaloisTool.GetIndexFromElt(15)
def test_context_scheme_bfv_sanity(sec_level):
poly_modulus_degree = 8192
plaintext_modulus = 1032193
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.BFV)
parms.set_poly_modulus_degree(poly_modulus_degree)
parms.set_plain_modulus(plaintext_modulus)
coeff = sealapi.CoeffModulus.Create(poly_modulus_degree, [32, 32])
parms.set_coeff_modulus(coeff)
sealctx = sealapi.SEALContext(parms, True, sec_level)
assert sealctx.parameters_set() is True
coeff = sealapi.CoeffModulus.BFVDefault(poly_modulus_degree, sec_level)
parms.set_coeff_modulus(coeff)
sealctx = sealapi.SEALContext(parms, True, sec_level)
context_asserts(sealctx, sec_level, sealapi.SCHEME_TYPE.BFV)
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_context_scheme_ckks_sanity(sec_level):
poly_modulus_degree = 8192
plaintext_modulus = 1032193
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.CKKS)
parms.set_poly_modulus_degree(poly_modulus_degree)
coeff = sealapi.CoeffModulus.Create(poly_modulus_degree, [60, 40, 40, 60])
parms.set_coeff_modulus(coeff)
sealctx = sealapi.SEALContext(parms, True, sealapi.SEC_LEVEL_TYPE.TC128)
assert sealctx.parameters_set() is True
context_asserts(sealctx, sec_level, sealapi.SCHEME_TYPE.CKKS)
def helper_context_invalid():
parms = sealapi.EncryptionParameters(sealapi.SCHEME_TYPE.BFV)
return sealapi.SEALContext(parms, True, sealapi.SEC_LEVEL_TYPE.TC128)
def helper_context_ckks(poly_modulus_degree=8192):
return sealapi.SEALContext(
helper_params_ckks(poly_modulus_degree), True, sealapi.SEC_LEVEL_TYPE.TC128
)
def helper_context_bfv(poly_modulus_degree=4096, plain_modulus=1032193):
return sealapi.SEALContext(
helper_params_bfv(poly_modulus_degree, plain_modulus), True, sealapi.SEC_LEVEL_TYPE.TC128
)
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(parms, False, sealapi.SEC_LEVEL_TYPE.NONE)
keygen = sealapi.KeyGenerator(ctx)
galois_keys = sealapi.GaloisKeys()
keygen.create_galois_keys(galois_keys)
public_key = sealapi.PublicKey()
keygen.create_public_key(public_key)
decryptor = sealapi.Decryptor(ctx, keygen.secret_key())
encryptor = sealapi.Encryptor(ctx, 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_context_failure(scheme, sec_level):
parms = sealapi.EncryptionParameters(scheme)
sealctx = sealapi.SEALContext(parms, True, sec_level)
assert sealctx.parameters_set() is False
