質問編集履歴
1
書式の改善
test
CHANGED
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File without changes
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test
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@@ -2,6 +2,214 @@
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2
2
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3
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コード
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4
4
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5
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int gcd(long f,long e){
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6
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7
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8
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9
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long r=1;
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13
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while(r!=0){
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r=f%e;
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f=e;
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e=r;
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20
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}
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return f;
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}
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int main(void){
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35
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36
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37
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long x;
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long y;
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long x1 = 1;
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long x2 = 0;
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long x3;
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long y1 = 0;
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long y2 = 1;
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long y3;
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long e;
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long f;
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long result1 = e;
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long result2 = f;
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long result3;
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long t;
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long hirabun;
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long p;
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68
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69
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long q;
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70
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long flag=0;
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73
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long i;
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74
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75
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long n;
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77
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78
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long d;
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81
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82
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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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84
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85
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scanf("%ld",&hirabun);
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86
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printf("pを入力してください:");
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89
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scanf("%ld",&p);
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90
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printf("qを入力してください:");
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scanf("%ld",&q);
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for( i=2;i<p;++i ) {
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97
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if( p%i==0 ) {
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98
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flag = 1;
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100
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101
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break;
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102
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103
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}
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104
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105
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}
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106
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107
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108
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109
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if( flag==0 )
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110
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111
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printf("%ld は素数です。\n",p);
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112
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113
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else
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114
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115
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printf("%ld は素数ではありません。\n",p);
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116
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117
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118
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119
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// return 0;
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120
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121
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122
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123
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for( i=2;i<q;++i ) {
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125
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if( q%i==0 ) {
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127
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flag = 1;
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128
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129
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break;
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130
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131
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}
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132
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133
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}
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134
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135
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136
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137
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if( flag==0 )
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138
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139
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printf("%ld は素数です。\n",q);
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140
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141
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else
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142
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143
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printf("%ld は素数ではありません。\n",q);
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144
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145
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146
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147
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n=p*q;
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148
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149
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f=(p-1)*(q-1);
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150
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151
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152
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153
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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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154
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155
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scanf ("%ld",&e);
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156
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157
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if(gcd(f,e)==1)
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158
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159
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printf("gcd(f,e)=1です\n");
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160
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161
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else
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162
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163
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printf("違います");
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164
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165
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166
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167
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while(1){
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168
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169
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t = result1 / result2;
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170
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171
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x3 = x1 - (t*x2);
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172
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173
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y3 = y1 - (t*y2);
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174
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175
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result3 = result1 - t*result2;
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176
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177
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if(result3==1){
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178
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179
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if(y3<0){
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180
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181
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return y3+e;
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182
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183
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}
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184
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185
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return y3;
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186
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187
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}
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188
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189
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x1 = x2;
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190
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191
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y1 = y2;
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192
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193
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result1 = result2;
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194
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195
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x2 = x3;
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196
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197
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y2 = y3;
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198
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199
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result2 = result3;
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200
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201
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}
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202
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203
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return 0;
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204
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205
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206
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207
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printf("秘密指数dは%ldです\n",x1);
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208
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209
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210
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211
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}
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212
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+
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5
213
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```### 前提・実現したいこと
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6
214
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7
215
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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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@@ -10,230 +218,4 @@
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10
218
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11
219
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12
220
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13
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-
int gcd(long f,long e){
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14
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-
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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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long r=1;
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18
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-
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19
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-
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20
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-
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21
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-
while(r!=0){
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22
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-
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23
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-
r=f%e;
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24
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-
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25
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-
f=e;
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26
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-
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27
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-
e=r;
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28
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-
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|
29
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-
}
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30
|
-
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31
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-
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|
32
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-
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33
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-
return f;
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34
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-
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35
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-
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36
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-
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|
37
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-
}
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38
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-
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39
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-
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40
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-
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|
41
|
-
int main(void){
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42
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-
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43
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-
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44
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-
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45
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long x;
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46
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-
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47
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-
long y;
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48
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-
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49
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-
long x1 = 1;
|
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50
|
-
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|
51
|
-
long x2 = 0;
|
|
52
|
-
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|
53
|
-
long x3;
|
|
54
|
-
|
|
55
|
-
long y1 = 0;
|
|
56
|
-
|
|
57
|
-
long y2 = 1;
|
|
58
|
-
|
|
59
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-
long y3;
|
|
60
|
-
|
|
61
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-
long e;
|
|
62
|
-
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|
63
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-
long f;
|
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64
|
-
|
|
65
|
-
long result1 = e;
|
|
66
|
-
|
|
67
|
-
long result2 = f;
|
|
68
|
-
|
|
69
|
-
long result3;
|
|
70
|
-
|
|
71
|
-
long t;
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72
|
-
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|
73
|
-
long hirabun;
|
|
74
|
-
|
|
75
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-
long p;
|
|
76
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-
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|
77
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-
long q;
|
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78
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-
|
|
79
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-
long flag=0;
|
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80
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-
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|
81
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-
long i;
|
|
82
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-
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|
83
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-
long n;
|
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84
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-
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|
85
|
-
|
|
86
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-
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|
87
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-
long d;
|
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88
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-
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|
89
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-
|
|
90
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-
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|
91
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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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92
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-
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|
93
|
-
scanf("%ld",&hirabun);
|
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94
|
-
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|
95
|
-
printf("pを入力してください:");
|
|
96
|
-
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|
97
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-
scanf("%ld",&p);
|
|
98
|
-
|
|
99
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-
printf("qを入力してください:");
|
|
100
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-
|
|
101
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-
scanf("%ld",&q);
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102
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-
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|
103
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-
for( i=2;i<p;++i ) {
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104
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-
|
|
105
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-
if( p%i==0 ) {
|
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106
|
-
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|
107
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-
flag = 1;
|
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108
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-
|
|
109
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-
break;
|
|
110
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-
|
|
111
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-
}
|
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112
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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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-
|
|
117
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-
if( flag==0 )
|
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118
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-
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|
119
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-
printf("%ld は素数です。\n",p);
|
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120
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-
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|
121
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-
else
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122
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-
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|
123
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-
printf("%ld は素数ではありません。\n",p);
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124
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-
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|
125
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-
|
|
126
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-
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|
127
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-
// return 0;
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|
128
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-
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|
129
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-
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|
130
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-
|
|
131
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-
for( i=2;i<q;++i ) {
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132
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-
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|
133
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-
if( q%i==0 ) {
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134
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-
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|
135
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-
flag = 1;
|
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136
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-
|
|
137
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-
break;
|
|
138
|
-
|
|
139
|
-
}
|
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140
|
-
|
|
141
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-
}
|
|
142
|
-
|
|
143
|
-
|
|
144
|
-
|
|
145
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-
if( flag==0 )
|
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146
|
-
|
|
147
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-
printf("%ld は素数です。\n",q);
|
|
148
|
-
|
|
149
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-
else
|
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150
|
-
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|
151
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-
printf("%ld は素数ではありません。\n",q);
|
|
152
|
-
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|
153
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-
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|
154
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-
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|
155
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-
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|
156
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-
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|
157
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-
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|
158
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-
|
|
159
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-
n=p*q;
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160
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-
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|
161
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-
f=(p-1)*(q-1);
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162
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-
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163
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-
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164
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-
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165
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-
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|
166
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-
|
|
167
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-
|
|
168
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-
|
|
169
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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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|
170
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-
|
|
171
|
-
scanf ("%ld",&e);
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172
|
-
|
|
173
|
-
if(gcd(f,e)==1)
|
|
174
|
-
|
|
175
|
-
printf("gcd(f,e)=1です\n");
|
|
176
|
-
|
|
177
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-
else
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178
|
-
|
|
179
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-
printf("違います");
|
|
180
|
-
|
|
181
|
-
|
|
182
|
-
|
|
183
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-
while(1){
|
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184
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-
|
|
185
|
-
t = result1 / result2;
|
|
186
|
-
|
|
187
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-
x3 = x1 - (t*x2);
|
|
188
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-
|
|
189
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-
y3 = y1 - (t*y2);
|
|
190
|
-
|
|
191
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-
result3 = result1 - t*result2;
|
|
192
|
-
|
|
193
|
-
if(result3==1){
|
|
194
|
-
|
|
195
|
-
if(y3<0){
|
|
196
|
-
|
|
197
|
-
return y3+e;
|
|
198
|
-
|
|
199
|
-
}
|
|
200
|
-
|
|
201
|
-
return y3;
|
|
202
|
-
|
|
203
|
-
}
|
|
204
|
-
|
|
205
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-
x1 = x2;
|
|
206
|
-
|
|
207
|
-
y1 = y2;
|
|
208
|
-
|
|
209
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-
result1 = result2;
|
|
210
|
-
|
|
211
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-
x2 = x3;
|
|
212
|
-
|
|
213
|
-
y2 = y3;
|
|
214
|
-
|
|
215
|
-
result2 = result3;
|
|
216
|
-
|
|
217
|
-
}
|
|
218
|
-
|
|
219
|
-
return 0;
|
|
220
|
-
|
|
221
|
-
|
|
222
|
-
|
|
223
|
-
printf("秘密指数dは%ldです\n",x1);
|
|
224
|
-
|
|
225
|
-
|
|
226
|
-
|
|
227
|
-
|
|
228
|
-
|
|
229
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-
|
|
230
|
-
|
|
231
|
-
|
|
232
|
-
|
|
233
|
-
}
|
|
234
|
-
|
|
235
|
-
|
|
236
|
-
|
|
237
|
-
|
|
238
|
-
|
|
239
221
|
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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