def test_rx_deterministic_propagation(self, width, x1, y1, x2, y2):
x1 = Constant(x1 % (2**width), width)
y1 = Constant(y1 % (2**width), width)
d1 = RXDiff.get_difference(x1, y1)
x2 = Constant(x2 % (2**width), width)
y2 = Constant(y2 % (2**width), width)
d2 = RXDiff.get_difference(x2, y2)
vd1 = DiffVar("in1", width)
vd2 = DiffVar("in2", width)
d3 = RXDiff.get_difference(~x1, ~y1)
vd3 = RXDiff.propagate(BvNot, vd1)
self.assertEqual(d3, vd3.xreplace({vd1: d1}))
d3 = RXDiff.get_difference(x1 ^ x2, y1 ^ y2)
vd3 = RXDiff.propagate(BvXor, [vd1, vd2])
self.assertEqual(d3, vd3.xreplace({vd1: d1, vd2: d2}))
d3 = RXDiff.get_difference(x1 ^ x2, y1 ^ x2) # Xor with a constant
vd3 = RXDiff.propagate(BvXor, [vd1, x2])
self.assertEqual(d3, vd3.xreplace({vd1: d1}))
r = int(x2) % x1.width
d3 = RXDiff.get_difference(RotateLeft(x1, r), RotateLeft(y1, r))
vd3 = RXDiff.propagate(RotateLeft, [vd1, r])
self.assertEqual(d3, vd3.xreplace({vd1: d1}))
d3 = RXDiff.get_difference(RotateRight(x1, r), RotateRight(y1, r))
vd3 = RXDiff.propagate(RotateRight, [vd1, r])
self.assertEqual(d3, vd3.xreplace({vd1: d1}))
def test_rx_linear_op(self, width, x1, y1, x2, y2):
x1 = Constant(x1 % (2**width), width)
y1 = Constant(y1 % (2**width), width)
d1 = RXDiff.from_pair(x1, y1)
x2 = Constant(x2 % (2**width), width)
y2 = Constant(y2 % (2**width), width)
d2 = RXDiff.from_pair(x2, y2)
self.assertEqual(RXDiff.from_pair(~x1, ~y1),
RXDiff.derivative(BvNot, d1))
self.assertEqual(RXDiff.from_pair(x1 ^ x2, y1 ^ y2),
RXDiff.derivative(BvXor, [d1, d2]))
cte = x2
BvXor_fix = make_partial_operation(BvXor, tuple([None, cte]))
self.assertEqual(RXDiff.from_pair(x1 ^ cte, y1 ^ cte),
RXDiff.derivative(BvXor_fix, [d1]))
cte = Variable("c", width)
BvXor_fix = make_partial_operation(BvShl, tuple([None, cte]))
with self.assertRaises(ValueError):
XorDiff.derivative(BvXor_fix, d1)
r = int(x2) % x1.width
RotateLeft_fix = make_partial_operation(RotateLeft, tuple([None, r]))
RotateRight_fix = make_partial_operation(RotateRight, tuple([None, r]))
self.assertEqual(
RXDiff.from_pair(RotateLeft(x1, r), RotateLeft(y1, r)),
RXDiff.derivative(RotateLeft_fix, d1))
self.assertEqual(
RXDiff.from_pair(RotateRight(x1, r), RotateRight(y1, r)),
RXDiff.derivative(RotateRight_fix, d1))
def test_xor_linear_op(self, width, x1, y1, x2, y2):
x1 = Constant(x1 % (2**width), width)
y1 = Constant(y1 % (2**width), width)
d1 = XorDiff.from_pair(x1, y1)
x2 = Constant(x2 % (2**width), width)
y2 = Constant(y2 % (2**width), width)
d2 = XorDiff.from_pair(x2, y2)
self.assertEqual(XorDiff.from_pair(~x1, ~y1),
XorDiff.derivative(BvNot, d1))
self.assertEqual(XorDiff.from_pair(x1 ^ x2, y1 ^ y2),
XorDiff.derivative(BvXor, [d1, d2]))
cte = x2
BvXor_fix = make_partial_operation(BvXor, tuple([None, cte]))
self.assertEqual(XorDiff.from_pair(x1 ^ cte, y1 ^ cte),
XorDiff.derivative(BvXor_fix, [d1]))
cte = Variable("c", width)
BvXor_fix = make_partial_operation(BvXor, tuple([None, cte]))
self.assertEqual(
XorDiff.from_pair(x1 ^ cte, y1 ^ cte),
XorDiff.derivative(BvXor, [d1, XorDiff.from_pair(cte, cte)]))
self.assertEqual(XorDiff.from_pair(x1 ^ cte, y1 ^ cte),
XorDiff.derivative(BvXor_fix, [d1]))
cte = x2
BvAnd_fix = make_partial_operation(BvAnd, tuple([None, cte]))
self.assertEqual(XorDiff.from_pair(x1 & cte, y1 & cte),
XorDiff.derivative(BvAnd_fix, [d1]))
r = int(x2) % x1.width
RotateLeft_fix = make_partial_operation(RotateLeft, tuple([None, r]))
RotateRight_fix = make_partial_operation(RotateRight, tuple([None, r]))
self.assertEqual(
XorDiff.from_pair(RotateLeft(x1, r), RotateLeft(y1, r)),
XorDiff.derivative(RotateLeft_fix, d1))
self.assertEqual(
XorDiff.from_pair(RotateRight(x1, r), RotateRight(y1, r)),
XorDiff.derivative(RotateRight_fix, d1))
r = Constant(int(x2) % x1.width, width)
BvShl_fix = make_partial_operation(BvShl, tuple([None, r]))
BvLshr_fix = make_partial_operation(BvLshr, tuple([None, r]))
self.assertEqual(XorDiff.from_pair(x1 << r, y1 << r),
XorDiff.derivative(BvShl_fix, d1))
self.assertEqual(XorDiff.from_pair(x1 >> r, y1 >> r),
XorDiff.derivative(BvLshr_fix, d1))
i = int(x2) % x1.width
j = int(y2) % (i + 1)
Extract_fix = make_partial_operation(Extract, tuple([None, i, j]))
self.assertEqual(XorDiff.from_pair(x1[i:j], y1[i:j]),
XorDiff.derivative(Extract_fix, d1))
self.assertEqual(XorDiff.from_pair(Concat(x1, x2), Concat(y1, y2)),
XorDiff.derivative(Concat, [d1, d2]))
def eval(cls, k3, k2, k1, k0):
if cls.rounds <= 4:
return [k0, k1, k2, k3][:cls.rounds]
k = [None for i in range(cls.rounds)]
k[:4] = [k0, k1, k2, k3]
m = 4
z = "11111010001001010110000111001101111101000100101011000011100110"
for i in range(4, cls.rounds):
tmp = RotateRight(k[i - 1], 3) ^ k[i - 3]
tmp ^= RotateRight(tmp, 1)
k[i] = ~k[i - m] ^ tmp ^ int(z[(i - m) % 62]) ^ 3
return k
def eval(cls, *master_key):
if cls.rounds <= m:
return list(reversed(master_key))[:cls.rounds]
k = [None for i in range(cls.rounds)]
k[:m] = list(reversed(master_key))
for i in range(m, cls.rounds):
tmp = RotateRight(k[i - 1], 3)
if m == 4:
tmp ^= k[i - 3]
tmp ^= RotateRight(tmp, 1)
k[i] = ~k[i - m] ^ tmp ^ int(z[(i - m) % 62]) ^ 3
return k
def test_pysmt_operations(self, width, x, y):
try:
from pysmt import shortcuts as sc
except ImportError:
return
modulus = 2 ** width
x = x % modulus
y = y % modulus
bvx = Constant(x, width)
bvy = Constant(y, width)
psx = sc.BV(x, width)
psy = sc.BV(y, width)
def eval_pysmt(pysmt_var):
return pysmt_var.simplify().constant_value()
self.assertEqual(~bvx, eval_pysmt(sc.BVNot(psx)))
self.assertEqual(bvx & bvy, eval_pysmt(sc.BVAnd(psx, psy)))
self.assertEqual(bvx | bvy, eval_pysmt(sc.BVOr(psx, psy)))
self.assertEqual(bvx ^ bvy, eval_pysmt(sc.BVXor(psx, psy)))
self.assertEqual(BvComp(bvx, bvy), eval_pysmt(sc.BVComp(psx, psy)))
self.assertEqual((bvx < bvy), eval_pysmt(sc.BVULT(psx, psy)))
self.assertEqual((bvx <= bvy), eval_pysmt(sc.BVULE(psx, psy)))
self.assertEqual((bvx > bvy), eval_pysmt(sc.BVUGT(psx, psy)))
self.assertEqual((bvx >= bvy), eval_pysmt(sc.BVUGE(psx, psy)))
r = y % bvx.width
self.assertEqual(bvx << bvy, eval_pysmt(sc.BVLShl(psx, psy)))
self.assertEqual(bvx >> bvy, eval_pysmt(sc.BVLShr(psx, psy)))
self.assertEqual(RotateLeft(bvx, r), eval_pysmt(sc.BVRol(psx, r)))
self.assertEqual(RotateRight(bvx, r), eval_pysmt(sc.BVRor(psx, r)))
bvb = Constant(y % 2, 1)
psb = sc.Bool(bool(bvb))
self.assertEqual(Ite(bvb, bvx, bvy), eval_pysmt(sc.Ite(psb, psx, psy)))
j = y % bvx.width
self.assertEqual(bvx[:j], eval_pysmt(sc.BVExtract(psx, start=j)))
self.assertEqual(bvx[j:], eval_pysmt(sc.BVExtract(psx, end=j)))
self.assertEqual(Concat(bvx, bvy), eval_pysmt(sc.BVConcat(psx, psy)))
self.assertEqual(ZeroExtend(bvx, j), eval_pysmt(sc.BVZExt(psx, j)))
self.assertEqual(Repeat(bvx, 1 + j), eval_pysmt(psx.BVRepeat(1 + j)))
self.assertEqual(-bvx, eval_pysmt(sc.BVNeg(psx)))
self.assertEqual(bvx + bvy, eval_pysmt(sc.BVAdd(psx, psy)))
self.assertEqual(bvx - bvy, eval_pysmt(sc.BVSub(psx, psy)))
self.assertEqual(bvx * bvy, eval_pysmt(sc.BVMul(psx, psy)))
if bvy > 0:
self.assertEqual(bvx / bvy, eval_pysmt(sc.BVUDiv(psx, psy)))
self.assertEqual(bvx % bvy, eval_pysmt(sc.BVURem(psx, psy)))
def test_bv2pysmt(self):
bvx, bvy = Variable("x", 8), Variable("y", 8)
psx, psy = bv2pysmt(bvx), bv2pysmt(bvy)
self.assertEqual(bv2pysmt(Constant(0, 8)), sc.BV(0, 8))
self.assertEqual(psx, sc.Symbol("x", typing.BVType(8)))
self.assertEqual(bv2pysmt(~bvx), sc.BVNot(psx))
self.assertEqual(bv2pysmt(bvx & bvy), sc.BVAnd(psx, psy))
self.assertEqual(bv2pysmt(bvx | bvy), sc.BVOr(psx, psy))
self.assertEqual(bv2pysmt(bvx ^ bvy), sc.BVXor(psx, psy))
self.assertEqual(bv2pysmt(BvComp(bvx, bvy)), sc.Equals(psx, psy))
self.assertEqual(bv2pysmt(BvNot(BvComp(bvx, bvy))),
sc.Not(sc.Equals(psx, psy)))
self.assertEqual(bv2pysmt(bvx < bvy), sc.BVULT(psx, psy))
self.assertEqual(bv2pysmt(bvx <= bvy), sc.BVULE(psx, psy))
self.assertEqual(bv2pysmt(bvx > bvy), sc.BVUGT(psx, psy))
self.assertEqual(bv2pysmt(bvx >= bvy), sc.BVUGE(psx, psy))
self.assertEqual(bv2pysmt(bvx << bvy), sc.BVLShl(psx, psy))
self.assertEqual(bv2pysmt(bvx >> bvy), sc.BVLShr(psx, psy))
self.assertEqual(bv2pysmt(RotateLeft(bvx, 1)), sc.BVRol(psx, 1))
self.assertEqual(bv2pysmt(RotateRight(bvx, 1)), sc.BVRor(psx, 1))
self.assertEqual(bv2pysmt(bvx[4:2]), sc.BVExtract(psx, 2, 4))
self.assertEqual(bv2pysmt(Concat(bvx, bvy)), sc.BVConcat(psx, psy))
# zeroextend reduces to Concat
# self.assertEqual(bv2pysmt(ZeroExtend(bvx, 2)), sc.BVZExt(psx, 2))
self.assertEqual(bv2pysmt(Repeat(bvx, 2)), psx.BVRepeat(2))
self.assertEqual(bv2pysmt(-bvx), sc.BVNeg(psx))
self.assertEqual(bv2pysmt(bvx + bvy), sc.BVAdd(psx, psy))
# bvsum reduces to add
# self.assertEqual(bv2pysmt(bvx - bvy), sc.BVSub(psx, psy))
self.assertEqual(bv2pysmt(bvx * bvy), sc.BVMul(psx, psy))
self.assertEqual(bv2pysmt(bvx / bvy), sc.BVUDiv(psx, psy))
self.assertEqual(bv2pysmt(bvx % bvy), sc.BVURem(psx, psy))
def rf(x, y, k):
"""Round function of Speck32/64."""
x = (RotateRight(x, 7) + y) ^ k
y = RotateLeft(y, 2) ^ x
return x, y
def rf(x, y, k):
"""Round function."""
x = (RotateRight(x, alpha) + y) ^ k
y = RotateLeft(y, beta) ^ x
return x, y
def test_bv2pysmt(self):
bv2pysmt = functools.partial(_bv2pysmt, env=self.env)
fm = self.env.formula_manager
tm = self.env.type_manager
bx, by = Variable("x", 8), Variable("y", 8)
b1x, b1y = Variable("x1", 1), Variable("y1", 1)
b6x, b6y = Variable("x6", 6), Variable("y6", 6)
px, py = bv2pysmt(bx), bv2pysmt(by)
p1x, p1y = bv2pysmt(b1x, True), bv2pysmt(b1y, True)
p6x, p6y = bv2pysmt(b6x), bv2pysmt(b6y)
self.assertEqual(bv2pysmt(Constant(0, 8)), fm.BV(0, 8))
self.assertEqual(px, fm.Symbol("x", tm.BVType(8)))
self.assertEqual(p1x, fm.Symbol("x1", tm.BOOL()))
self.assertEqual(bv2pysmt(~bx), fm.BVNot(px))
self.assertEqual(bv2pysmt(~b1x, True), fm.Not(p1x))
self.assertEqual(bv2pysmt(bx & by), fm.BVAnd(px, py))
self.assertEqual(bv2pysmt(b1x & b1y, True), fm.And(p1x, p1y))
self.assertEqual(bv2pysmt(bx | by), fm.BVOr(px, py))
self.assertEqual(bv2pysmt(b1x | b1y, True), fm.Or(p1x, p1y))
self.assertEqual(bv2pysmt(bx ^ by), fm.BVXor(px, py))
self.assertEqual(bv2pysmt(b1x ^ b1y, True), fm.Xor(p1x, p1y))
self.assertEqual(bv2pysmt(BvComp(bx, by)), fm.BVComp(px, py))
self.assertEqual(bv2pysmt(BvComp(bx, by), True), fm.Equals(px, py))
self.assertEqual(bv2pysmt(BvNot(BvComp(bx, by))),
fm.BVNot(fm.BVComp(px, py)))
self.assertEqual(bv2pysmt(BvNot(BvComp(bx, by)), True),
fm.Not(fm.Equals(px, py)))
self.assertEqual(bv2pysmt(bx < by), fm.BVULT(px, py))
self.assertEqual(bv2pysmt(bx <= by), fm.BVULE(px, py))
self.assertEqual(bv2pysmt(bx > by), fm.BVUGT(px, py))
self.assertEqual(bv2pysmt(bx >= by), fm.BVUGE(px, py))
self.assertEqual(bv2pysmt(bx << by), fm.BVLShl(px, py))
self.assertEqual(bv2pysmt(bx >> by), fm.BVLShr(px, py))
self.assertEqual(bv2pysmt(RotateLeft(bx, 1)), fm.BVRol(px, 1))
self.assertEqual(bv2pysmt(RotateRight(bx, 1)), fm.BVRor(px, 1))
def zext(pysmt_type, offset):
# zero_extend reduces to Concat
return fm.BVConcat(fm.BV(0, offset), pysmt_type)
self.assertEqual(
bv2pysmt(b6x << b6y, strict_shift=True),
fm.BVExtract(fm.BVLShl(zext(p6x, 2), zext(p6y, 2)), 0, 5))
self.assertEqual(
bv2pysmt(RotateRight(b6x, 1), strict_shift=True),
fm.BVConcat(fm.BVExtract(p6x, 0, 0), fm.BVExtract(p6x, 1, 5)))
self.assertEqual(bv2pysmt(bx[4:2]), fm.BVExtract(px, 2, 4))
self.assertEqual(bv2pysmt(Concat(bx, by)), fm.BVConcat(px, py))
self.assertEqual(bv2pysmt(ZeroExtend(bx, 2)), zext(px, 2))
self.assertEqual(bv2pysmt(Repeat(bx, 2)), px.BVRepeat(2))
self.assertEqual(bv2pysmt(-bx), fm.BVNeg(px))
self.assertEqual(bv2pysmt(bx + by), fm.BVAdd(px, py))
# bv_sum reduces to add
self.assertEqual(bv2pysmt(bx - by), fm.BVSub(px, py))
self.assertEqual(bv2pysmt(bx * by), fm.BVMul(px, py))
self.assertEqual(bv2pysmt(bx / by), fm.BVUDiv(px, py))
self.assertEqual(bv2pysmt(bx % by), fm.BVURem(px, py))
# cannot reuse Bool and BV{1} variable with the same name
bxx, byy = Variable("xx", 8), Variable("yy", 8)
b1xx, b1yy, b1zz = Variable("xx1", 1), Variable("yy1",
1), Variable("zz1", 1)
pxx, pyy = bv2pysmt(bxx), bv2pysmt(byy)
p1xx, p1yy, p1zz = bv2pysmt(b1xx, False), bv2pysmt(b1yy,
True), bv2pysmt(
b1zz, True)
self.assertEqual(bv2pysmt(Ite(b1xx, bxx, byy)),
fm.Ite(fm.Equals(p1xx, fm.BV(1, 1)), pxx, pyy))
self.assertEqual(bv2pysmt(Ite(b1xx, b1yy, b1zz), True),
fm.Ite(fm.Equals(p1xx, fm.BV(1, 1)), p1yy, p1zz))
def eval(cls, mk):
return tuple([RotateRight(mk, 1) + Constant(3, 8)])
def f_inverse(x, y):
y = RotateRight(x ^ y, 2)
x = RotateLeft((x ^ k) - y, 7)
return x, y
def f(x, y):
x = (RotateRight(x, 7) + y) ^ k
y = RotateLeft(y, 2) ^ x
return x, y
def _simple_properties(self, x):
width = x.width
allones = BvNot(Constant(0, width))
assert ~~x == x
# assert ~(x & y) == (~x) | (~y)
# assert ~(x | y) == (~x) & (~y)
assert x & 0 == 0 & x == 0
assert x & allones == allones & x == x
assert x & x == x
assert x & (~x) == 0
assert x | 0 == 0 | x == x
assert x | allones == allones | x == allones
assert x | x == x
assert x | (~x) == allones
assert x ^ 0 == 0 ^ x == x
assert x ^ allones == allones ^ x == ~x
assert x ^ x == 0
assert x ^ (~x) == allones
assert x << 0 == x >> 0 == x
assert 0 << x == 0 >> x == 0
if isinstance(x, Constant):
r = min(2 * int(x), x.width)
assert (x << x) << x == x << r
assert (x >> x) >> x == x >> r
elif isinstance(x, Variable) and x.width >= 2:
assert (x << 1) << 1 == x << 2
assert (x >> 1) >> 1 == x >> 2
n = x.width
assert RotateLeft(x, 0) == RotateRight(x, 0) == x
if x.width > 2:
assert RotateLeft(RotateLeft(x, 1), 1) == RotateLeft(x, 2)
assert RotateRight(RotateRight(x, 1), 1) == RotateRight(x, 2)
if x.width > 3:
assert RotateLeft(RotateRight(x, 1), 2) == RotateRight(x, n - 1)
assert RotateRight(RotateLeft(x, 1), 2) == RotateLeft(x, n - 1)
if isinstance(x, Constant):
i = int(x) % (width - 1)
elif isinstance(x, Variable) and x.width >= 2:
i = width - 2
n = x.width
assert x[:] == x
assert x[:i][1:0] == x[i + 1:i]
assert Concat(x, x)[n - 1:i] == x[:i] # n - 1 <= x.width - 1
assert Concat(x, x)[n + i:n] == x[i:] # n >= x.wdith
assert (x << i)[:i] == x[n - 1 - i:] # i <= i
assert RotateLeft(x, i)[:i + 1] == x[n - 1 - i: 1] # i <= i + 1
assert (x >> i)[n - i - 1:] == x[n - 1:i] # n - i - 1 < n - i
assert RotateRight(x, i)[n - i - 1:] == x[n - 1:i]
# assert (x & y)[0] == x[0] & y[0]
if isinstance(x, Constant):
i = int(x) % (width - 1)
else:
assert x.width >= 2
i = width - 2
assert Concat(x[:i + 1], x[i:]) == x
assert -(-x) == x
# assert -(x + y) == -(x) + -(y)
# assert -(x * y) == -(x) * y
# assert -(x / y) == -(x) / y
# assert -(x % y) == -(x) % y
# assert -(x ^ y) == BvNot(x ^ y, evaluate=False)
assert x + 0 == 0 + x == x
assert x + (-x) == 0
assert x - 0 == x
assert 0 - x == -x
assert x - x == 0
assert x * 0 == 0 * x == 0
assert x * 1 == 1 * x == x
if x != 0:
assert x / x == 1
assert 0 / x == 0
assert x / 1 == x
assert x % x == 0 % x == x % 1 == 0
def _simple_properties(self, x):
width = x.width
allones = BvNot(Constant(0, width))
self.assertTrue( ~~x == x )
# self.assertTrue( ~(x & y) == (~x) | (~y) )
# self.assertTrue( ~(x | y) == (~x) & (~y) )
self.assertTrue( x & 0 == 0 & x == 0 )
self.assertTrue( x & allones == allones & x == x )
self.assertTrue( x & x == x )
self.assertTrue( x & (~x) == 0 )
self.assertTrue( x | 0 == 0 | x == x )
self.assertTrue( x | allones == allones | x == allones )
self.assertTrue( x | x == x )
self.assertTrue( x | (~x) == allones )
self.assertTrue( x ^ 0 == 0 ^ x == x )
self.assertTrue( x ^ allones == allones ^ x == ~x )
self.assertTrue( x ^ x == 0 )
self.assertTrue( x ^ (~x) == allones )
self.assertTrue( x << 0 == x >> 0 == x )
self.assertTrue( 0 << x == 0 >> x == 0 )
if isinstance(x, Constant):
r = min(2 * int(x), x.width)
self.assertTrue( (x << x) << x == x << r )
self.assertTrue( (x >> x) >> x == x >> r )
elif isinstance(x, Variable) and x.width >= 2:
self.assertTrue( (x << 1) << 1 == x << 2 )
self.assertTrue( (x >> 1) >> 1 == x >> 2 )
n = x.width
self.assertTrue( RotateLeft(x, 0) == RotateRight(x, 0) == x )
if x.width > 2:
self.assertTrue( RotateLeft(RotateLeft(x, 1), 1) == RotateLeft(x, 2) )
self.assertTrue( RotateRight(RotateRight(x, 1), 1) == RotateRight(x, 2) )
if x.width > 3:
self.assertTrue( RotateLeft(RotateRight(x, 1), 2) == RotateRight(x, n - 1) )
self.assertTrue( RotateRight(RotateLeft(x, 1), 2) == RotateLeft(x, n - 1) )
if isinstance(x, Constant):
i = int(x) % (width - 1)
elif isinstance(x, Variable) and x.width >= 2:
i = width - 2
else:
raise ValueError("invalid x: {}".format(x))
n = x.width
self.assertTrue( x[:] == x )
self.assertTrue( x[:i][1:0] == x[i + 1:i] )
self.assertTrue( Concat(x, x)[n - 1:i] == x[:i] ) # n - 1 <= x.width - 1
self.assertTrue( Concat(x, x)[n + i:n] == x[i:] ) # n >= x.width
self.assertTrue( (x << i)[:i] == x[n - 1 - i:] ) # i <= i
self.assertTrue( RotateLeft(x, i)[:i + 1] == x[n - 1 - i: 1] ) # i <= i + 1
self.assertTrue( (x >> i)[n - i - 1:] == x[n - 1:i] ) # n - i - 1 < n - i
self.assertTrue( RotateRight(x, i)[n - i - 1:] == x[n - 1:i] )
# assert (x & y)[0] == x[0] & y[0]
if isinstance(x, Constant):
i = int(x) % (width - 1)
else:
self.assertTrue( x.width >= 2 )
i = width - 2
self.assertTrue( Concat(x[:i + 1], x[i:]) == x )
zero_bit = Constant(0, 1)
self.assertTrue( Concat(zero_bit, Concat(zero_bit, x)) == Concat(Constant(0, 2), x) )
self.assertTrue( Concat(Concat(x, zero_bit), zero_bit) == Concat(x, Constant(0, 2)) )
self.assertTrue( -(-x) == x )
# assert -(x + y) == -(x) + -(y)
# assert -(x * y) == -(x) * y
# assert -(x / y) == -(x) / y
# assert -(x % y) == -(x) % y
# assert -(x ^ y) == BvNot(x ^ y, evaluate=False)
self.assertTrue( x + 0 == 0 + x == x )
self.assertTrue( x + (-x) == 0 )
self.assertTrue( x - 0 == x )
self.assertTrue( 0 - x == -x )
self.assertTrue( x - x == 0 )
self.assertTrue( x * 0 == 0 * x == 0 )
self.assertTrue( x * 1 == 1 * x == x )
if x != 0:
self.assertTrue( x / x == 1 )
self.assertTrue( 0 / x == 0 )
self.assertTrue( x / 1 == x )
self.assertTrue( x % x == 0 % x == x % 1 == 0 )