Python z3.BitVecVal方法代码示例

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def update_storages(self, sstore_data):
        for address, index, value in sstore_data:
            address = int(address[2:], 16)
            assert address in self.root_wstate.address_to_account
            if index > 100:
                if index in self.log_sha_to_sym_sha:
                    store_index = self.log_sha_to_sym_sha[index]
                else:
                    log_shas = list(self.log_sha_to_sym_sha.keys())
                    diffs = [abs(l - index) for l in log_shas]
                    min_index = diffs.index(min(diffs))
                    diff = diffs[min_index]
                    if diff < 10:
                        relative_index = log_shas[min_index]
                        store_index = z3.simplify(self.log_sha_to_sym_sha[relative_index] + z3.BitVecVal(diff, 256))
                        self.log_sha_to_sym_sha[index] = store_index
                    else:
                        store_index = z3.BitVecVal(index, 256)
            else:
                store_index = z3.BitVecVal(index, 256)
            store_value = self.log_sha_to_sym_sha.get(value, z3.BitVecVal(value, 256))
            account = self.root_wstate.address_to_account[address]
            account.storage.store(store_index, store_value) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def execute(self, expr):
        expr = expr.encode('utf-8')


        for op in expr.split(','):
            val = to_int(op)
            if val:
                self.push(z3.BitVecVal(val, 32))
            elif op in self.instr_table:
                self.instr_table[op]()
                
            elif op == '':
                # Sometimes a value might be absent, set to 0 as a
                # temporary workaround, probably a bug in ESIL
                self.push(zero())
            else:
                # Otherwise it's either register or
                # a flag
                self.push(op)
                

    # Commands 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def check_interp(interp, constraints, bits=32, valbits=8):
    """Checks that a list of @constraints (addr, value) (as python ints)
    match a z3 FuncInterp (@interp).
    """
    constraints = dict((addr,
                        z3.BitVecVal(val, valbits))
                       for addr, val in constraints)
    entry = interp.children()
    assert len(entry) == 3
    _, addr, value = entry
    addr = addr.as_long()
    assert addr in constraints
    assert equiv(value, constraints[addr])

# equiv short test
# -------------------------------------------------------------------------- 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def update_sha(self, sha_data):
        for arg, log_value, length_bytes in sha_data:
            if log_value in self.log_sha_to_sym_sha:
                continue
            data = z3.BitVecVal(arg, length_bytes * 8)
            if data.size() == 512:
                data_words = svm_utils.split_bv_by_words(data)
                data_words = [d.as_long() for d in data_words]
                data_words = [self.log_sha_to_sym_sha.get(d, z3.BitVecVal(d, 256)) for d in data_words]
                data = z3.simplify(z3.Concat(data_words))
            sha_constraints, hash_vector = svm_utils.symbolic_keccak(self, data)
            self.log_sha_to_sym_sha[log_value] = hash_vector
            self.root_wstate.constraints.extend(sha_constraints)
        solver = z3.Solver()
        solver.add(self.root_wstate.constraints)
        assert solver.check() == z3.sat 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def SHA3(self, gstate, index, length):
        if svm_utils.is_bv_concrete(index) and svm_utils.is_bv_concrete(length):
            index = svm_utils.get_concrete_int(index)
            length = svm_utils.get_concrete_int(length)
            if length == 0:
                gstate.mstate.stack.append(z3.BitVecVal(SHA_EMPTY_ARGS_VALUE, 256))
                return
            data = z3.simplify(svm_utils.get_memory_data(gstate.mstate.memory, index, length))
            sha_constraints, hash_vector = svm_utils.symbolic_keccak(self, data)
            gstate.wstate.constraints.extend(sha_constraints)
            gstate.mstate.stack.append(hash_vector)
            return
        hash_vector = self.svm.sym_bv_generator.get_sym_bitvec(constraints.ConstraintType.SHA3,
                                                               gstate.wstate.gen,
                                                               unique=True)
        logging.debug('SHA index or len not resolved. Using the symbolic vector')
        gstate.mstate.stack.append(hash_vector)
        return 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def zero():
    return z3.BitVecVal(0, BITS) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def BVV(self, ast):
        if ast.args[0] is None:
            raise BackendError("Z3 can't handle empty BVVs")

        size = ast.size()
        # TODO: Here there is no need to use low level API since teh high level API just perform some conversions which
        #       are mandatory to fix the types of the arguments requested by the low level API
        return z3.BitVecVal(ast.args[0], size, ctx=self._context) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def from_ExprInt(self, expr):
        return z3.BitVecVal(int(expr), expr.size) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def from_ExprLoc(self, expr):
        if self.loc_db is None:
            # No loc_db, fallback to default name
            return z3.BitVec(str(expr), expr.size)
        loc_key = expr.loc_key
        offset = self.loc_db.get_location_offset(loc_key)
        if offset is not None:
            return z3.BitVecVal(offset, expr.size)
        # fallback to default name
        return z3.BitVec(str(loc_key), expr.size) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def _sdivC(self, num, den):
        """Divide (signed) @num by @den (z3 values) as C would
        See modint.__div__ for implementation choice
        """
        result_sign = z3.If(num * den >= 0,
                            z3.BitVecVal(1, num.size()),
                            z3.BitVecVal(-1, num.size()),
        )
        return z3.UDiv(self._abs(num), self._abs(den)) * result_sign 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def PUSH(self, gstate):
        instr = gstate.environment.disassembly.instruction_list[gstate.mstate.pc]
        value = z3.BitVecVal(int(instr['argument'][2:], 16), 256)
        gstate.mstate.stack.append(value) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def EXP(self, gstate, base, exponent):
        base, exponent = map(svm_utils.convert_to_bitvec, (base, exponent))
        if svm_utils.is_bv_concrete(base) and svm_utils.is_bv_concrete(exponent):
            base = svm_utils.get_concrete_int(base)
            exponent = svm_utils.get_concrete_int(exponent)
            value = pow(base, exponent, 2**256)
            gstate.mstate.stack.append(z3.BitVecVal(value, 256))
        else:
            active_account = gstate.wstate.address_to_account[gstate.environment.active_address]
            gstate.mstate.stack.append(self.svm.sym_bv_generator.get_sym_bitvec(constraints.ConstraintType.EXP,
                                                                                gstate.wstate.gen,
                                                                                unique=True,
                                                                                acc=active_account.id)) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def CALLDATACOPY(self, gstate, dest_offset, offset, length):
        length_concrete = svm_utils.is_bv_concrete(length)
        if not length_concrete:
            logging.warning('Symbolic calldata size')
            length = z3.BitVecVal(64, 256)
        if gstate.environment.calldata_type == CalldataType.UNDEFINED:
            length = svm_utils.get_concrete_int(length)
            if svm_utils.is_bv_concrete(offset):
                offset = svm_utils.get_concrete_int(offset)
                for i in range(length):
                    data_word = self.svm.sym_bv_generator.get_sym_bitvec(constraints.ConstraintType.CALLDATA,
                                                                         gstate.wstate.gen,
                                                                         index=offset+(i//32))
                    slot = i % 32
                    data_bytes = svm_utils.split_bv_into_bytes(data_word)
                    data = data_bytes[slot]
                    gstate.mstate.memory = z3.Store(gstate.mstate.memory, dest_offset+i, data)
            else:
                for i in range(length):
                    data = self.svm.sym_bv_generator.get_sym_bitvec(constraints.ConstraintType.CALLDATA,
                                                                    gstate.wstate.gen,
                                                                    unique=True,
                                                                    bv_size=8)
                    gstate.mstate.memory = z3.Store(gstate.mstate.memory, dest_offset+i, data)
        elif gstate.environment.calldata_type == CalldataType.DEFINED:
            length = svm_utils.get_concrete_int(length)
            offset_concrete = svm_utils.is_bv_concrete(offset)
            calldata_bytes = svm_utils.split_bv_into_bytes(gstate.environment.calldata)
            offset_concrete = svm_utils.is_bv_concrete(offset)
            for i in range(length):
                gstate.mstate.memory = z3.Store(gstate.mstate.memory, dest_offset+i, calldata_bytes[offset_concrete+i])
        else:
            raise SVMRuntimeError('Unknown calldata type') 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def ADDRESS(self, gstate):
        gstate.mstate.stack.append(z3.BitVecVal(gstate.environment.active_address, 256)) 

# 需要导入模块: import z3 [as 别名]
# 或者: from z3 import BitVecVal [as 别名]
def CODESIZE(self, gstate):
        gstate.mstate.stack.append(z3.BitVecVal(len(gstate.environment.runtime_bytecode_bytes), 256))