/// <summary>
/// 密码强度
/// </summary>
private
enum
Strength
{
Invalid = 0,
//无效密码
Weak = 1,
//低强度密码
Normal = 2,
//中强度密码
Strong = 3
//高强度密码
};
/// <summary>
/// 计算密码强度
/// </summary>
/// <param name="password">密码字符串</param>
/// <returns></returns>
private
static
Strength PasswordStrength(
string
password)
{
//空字符串强度值为0
if
(password ==
""
)
return
Strength.Invalid;
//字符统计
int
iNum = 0, iLtt = 0, iSym = 0;
foreach
(
char
c
in
password)
{
if
(c >=
'0'
&& c <=
'9'
) iNum++;
else
if
(c >=
'a'
&& c <=
'z'
) iLtt++;
else
if
(c >=
'A'
&& c <=
'Z'
) iLtt++;
else
iSym++;
}
if
(iLtt == 0 && iSym == 0)
return
Strength.Weak;
//纯数字密码
if
(iNum == 0 && iLtt == 0)
return
Strength.Weak;
//纯符号密码
if
(iNum == 0 && iSym == 0)
return
Strength.Weak;
//纯字母密码
if
(password.Length <= 6)
return
Strength.Weak;
//长度不大于6的密码
if
(iLtt == 0)
return
Strength.Normal;
//数字和符号构成的密码
if
(iSym == 0)
return
Strength.Normal;
//数字和字母构成的密码
if
(iNum == 0)
return
Strength.Normal;
//字母和符号构成的密码
if
(password.Length <= 10)
return
Strength.Normal;
//长度不大于10的密码
return
Strength.Strong;
//由数字、字母、符号构成的密码
}