c语言计算密码强度

1.源码实现

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* 1-小写字母, 2-大写字母, 3-数字, 4-符号, 5-其它 */
int initmap(int *map)
{
    int i;

    for(i=0; i<256; i++)
    {
        map[i] = 5;

        if(i>=0x21 && i<=0x2F)
        {
            map[i] = 4;
        }
        else if(i>=0x3a && i<=0x40)
        {
            map[i] = 4;
        }
        else if(i>=0x5b && i<=0x60)
        {
            map[i] = 4;
        }
        else if(i>=0x7b && i<=0x7e)
        {
            map[i] = 4;
        }
    }

    for(i=0; i<26; i++)
    {
        map[i+'a'] = 1;
        map[i+'A'] = 2;
    }

    for(i=0; i<10; i++)
    {
        map[i+'0'] = 3;
    }

    return 0;
}

int passinfo(int *map, char *passwd, int *num)
{
    int i = 0;

    for(i=0; passwd[i]!=0x00; i++)
    {
        num[map[passwd[i]]]++;
    }

    for(i=1; i<6; i++)
    {
        num[0] += num[i];
    }

    return 0;
}

int getscore(int *map, int *num)
{
    int score = 0;
    int len;

    len = num[0];
    if(len <= 4)
    {
        score += 5;
    }
    else if(len <= 7)
    {
        score += 10;
    }
    else
    {
        score += 25;
    }

#ifdef SCORE_DEBUG
    printf("score=%d\n", score);
#endif

    if(!(num[1]+num[2]))
    {
        score += 0;
    }
    else if(!(num[1] && num[2]))
    {
        score += 10;
    }
    else
    {
        score += 20;
    }

#ifdef SCORE_DEBUG
    printf("score=%d\n", score);
#endif

    if(!num[3])
    {
        score += 0;
    }
    else if(num[3] == 1)
    {
        score += 10;
    }
    else
    {
        score += 20;
    }

#ifdef SCORE_DEBUG
    printf("score=%d\n", score);
#endif

    if(!num[4])
    {
        score += 0;
    }
    else if(num[4] == 1)
    {
        score += 10;
    }
    else
    {
        score += 25;
    }

#ifdef SCORE_DEBUG
    printf("score=%d\n", score);
#endif

    if(num[1] && num[2] && num[3] && num[4])
    {
        score += 5;
    }
    else if((num[1]||num[2]) && num[3] && num[4])
    {
        score += 3;
    }
    else if((num[1]||num[2]) && num[3])
    {
        score += 2;
    }

#ifdef SCORE_DEBUG
    printf("score=%d\n", score);
#endif

    return score;
}

int output(short score)
{
    if(score >= 90)
    {
        printf("VERY_SECURE\n");
    }
    else if(score >= 80)
    {
        printf("SECURE\n");
    }
    else if(score >= 70)
    {
        printf("VERY_STRONG\n");
    }
    else if(score >= 60)
    {
        printf("STRONG\n");
    }
    else if(score >= 50)
    {
        printf("AVERAGE\n");
    }
    else if(score >= 25)
    {
        printf("WEAK\n");
    }
    else if(score >= 0)
    {
        printf("VERY_WEAK\n");
    }

    return 0;
}

int main()
{
    char passwd[1024];
    int map[256];
    int num[10];
    int score;

    initmap(map);

    memset(passwd, 0x00, sizeof(passwd));
    memset(num, 0x00, sizeof(num));

    while(scanf("%s", passwd) != EOF)
    {
        passinfo(map, passwd, num);

        score = getscore(map, num);

        output(score);

        memset(passwd, 0x00, sizeof(passwd));
        memset(num, 0x00, sizeof(num));
    }

    return 0;
}

2.编译源码

$ gcc -o example examle.c -std=c89

4.运行及其结果

$ ./example
38$@NoNoNo
VERY_SECURE
123
WEAK