質問編集履歴
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書式の改善
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File without changes
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body
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@@ -1,47 +1,43 @@
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1
1
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``言語はc言語です
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2
2
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コード
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3
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-
```### 前提・実現したいこと
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4
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-
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3
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+
int gcd(long f,long e){
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5
4
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5
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long r=1;
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6
6
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7
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-
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7
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+
while(r!=0){
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8
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r=f%e;
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9
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f=e;
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10
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e=r;
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11
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}
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8
12
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9
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-
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13
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return f;
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10
14
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11
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-
while(r!=0){
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12
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-
r=f%e;
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13
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f=e;
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14
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e=r;
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15
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}
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16
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-
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17
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return f;
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18
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-
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15
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}
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16
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21
17
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int main(void){
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22
18
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23
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-
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19
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long x;
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24
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-
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20
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long y;
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25
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-
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21
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long x1 = 1;
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26
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-
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22
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long x2 = 0;
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27
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-
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23
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long x3;
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28
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-
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24
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long y1 = 0;
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29
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-
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25
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long y2 = 1;
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30
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-
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26
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long y3;
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31
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-
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27
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long e;
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32
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-
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28
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long f;
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33
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-
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29
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long result1 = e;
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34
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-
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30
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long result2 = f;
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35
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-
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31
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long result3;
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36
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-
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32
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+
long t;
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37
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-
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33
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long hirabun;
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38
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-
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34
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long p;
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39
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-
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35
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long q;
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40
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-
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36
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long flag=0;
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41
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-
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37
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long i;
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42
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-
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38
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long n;
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43
39
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44
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-
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40
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long d;
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45
41
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46
42
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printf("平文となる数字を入力してください:");
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47
43
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scanf("%ld",&hirabun);
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@@ -50,71 +46,66 @@
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50
46
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printf("qを入力してください:");
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51
47
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scanf("%ld",&q);
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52
48
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for( i=2;i<p;++i ) {
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53
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-
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49
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if( p%i==0 ) {
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54
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-
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50
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flag = 1;
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55
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-
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51
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break;
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56
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-
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52
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}
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57
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-
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53
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}
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58
54
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59
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-
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55
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if( flag==0 )
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60
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-
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56
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printf("%ld は素数です。\n",p);
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61
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-
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57
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else
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62
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-
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58
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printf("%ld は素数ではありません。\n",p);
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63
59
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64
60
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// return 0;
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65
61
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66
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-
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62
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+
for( i=2;i<q;++i ) {
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67
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-
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63
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if( q%i==0 ) {
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68
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-
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64
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flag = 1;
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69
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-
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65
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break;
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70
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-
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66
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}
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71
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-
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67
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}
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72
68
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73
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-
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69
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+
if( flag==0 )
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74
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-
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70
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printf("%ld は素数です。\n",q);
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75
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-
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71
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else
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76
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-
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72
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printf("%ld は素数ではありません。\n",q);
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77
73
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74
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n=p*q;
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75
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f=(p-1)*(q-1);
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78
76
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77
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printf("gcd(f,e)=1となるeを入力してください:");
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78
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scanf ("%ld",&e);
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79
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if(gcd(f,e)==1)
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80
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printf("gcd(f,e)=1です\n");
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81
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else
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82
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printf("違います");
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79
83
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80
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-
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84
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+
while(1){
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85
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t = result1 / result2;
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86
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x3 = x1 - (t*x2);
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87
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y3 = y1 - (t*y2);
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88
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result3 = result1 - t*result2;
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81
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-
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89
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+
if(result3==1){
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90
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+
if(y3<0){
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91
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+
return y3+e;
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92
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+
}
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93
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+
return y3;
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94
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}
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95
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x1 = x2;
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96
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y1 = y2;
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97
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+
result1 = result2;
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98
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+
x2 = x3;
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99
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y2 = y3;
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100
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result2 = result3;
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101
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}
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102
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return 0;
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82
103
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104
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+
printf("秘密指数dは%ldです\n",x1);
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83
105
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84
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-
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85
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printf("gcd(f,e)=1となるeを入力してください:");
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86
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scanf ("%ld",&e);
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87
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if(gcd(f,e)==1)
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88
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printf("gcd(f,e)=1です\n");
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89
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-
else
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90
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printf("違います");
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91
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-
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92
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-
while(1){
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93
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-
t = result1 / result2;
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94
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-
x3 = x1 - (t*x2);
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95
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y3 = y1 - (t*y2);
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96
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-
result3 = result1 - t*result2;
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97
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-
if(result3==1){
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98
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-
if(y3<0){
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99
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-
return y3+e;
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100
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-
}
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101
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-
return y3;
|
|
102
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-
}
|
|
103
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-
x1 = x2;
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104
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-
y1 = y2;
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105
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-
result1 = result2;
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106
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-
x2 = x3;
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107
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-
y2 = y3;
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108
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-
result2 = result3;
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|
109
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-
}
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110
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-
return 0;
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111
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-
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112
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-
printf("秘密指数dは%ldです\n",x1);
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113
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-
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114
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-
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115
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-
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116
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-
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117
106
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}
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107
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+
```### 前提・実現したいこと
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108
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+
この場合秘密指数はz2が０のときのx1でいいですよね？
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|
118
109
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119
110
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120
111
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また質問内容以外でおかしなところがあったらご指摘お願いします。
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