{"id":87922,"date":"2024-03-21T09:04:24","date_gmt":"2024-03-21T00:04:24","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%a7gsm%e6%9a%97%e5%8f%b7%e5%8c%96%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ab%e3%81%af%e3%81%a9%e3%81%86\/"},"modified":"2024-03-27T09:44:47","modified_gmt":"2024-03-27T00:44:47","slug":"c%e8%a8%80%e8%aa%9e%e3%81%a7gsm%e6%9a%97%e5%8f%b7%e5%8c%96%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ab%e3%81%af%e3%81%a9%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%a7gsm%e6%9a%97%e5%8f%b7%e5%8c%96%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ab%e3%81%af%e3%81%a9%e3%81%86\/","title":{"rendered":"C\u8a00\u8a9e\u3067GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u304b"},"content":{"rendered":"<p>GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7406\u89e3\u3059\u308b: GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u3067\u3042\u308a\u3001\u7dda\u5f62\u5e30\u9084\u30b7\u30d5\u30c8\u30ec\u30b8\u30b9\u30bf(Linear Feedback Shift Register, LFSR)\u3092\u4f7f\u7528\u3057\u3066\u9375\u3092\u751f\u6210\u3057\u3001\u30d7\u30ec\u30fc\u30f3\u30c6\u30ad\u30b9\u30c8\u3068XOR\u6f14\u7b97\u3092\u884c\u3044\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u30c6\u30ad\u30b9\u30c8\u306b\u3057\u307e\u3059\u3002<\/li>\n<li>GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u898f\u5b9a\u3055\u308c\u305fLFSR\u591a\u9805\u5f0f\u3068\u521d\u671f\u72b6\u614b\u306b\u5f93\u3063\u3066\u3001LFSR\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u9375\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u3002<\/li>\n<li>\u5e73\u6587\u3068\u751f\u6210\u3055\u308c\u305f\u30ad\u30fc\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u6392\u4ed6\u7684\u8ad6\u7406\u548c\u6f14\u7b97\u3057\u3066\u6697\u53f7\u6587\u3092\u5f97\u308b\u3002<\/li>\n<\/ol>\n<p>\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-comment\">\/\/ LFSR\u7b97\u6cd5\u751f\u6210\u5bc6\u94a5\u5e8f\u5217<\/span>\r\n<span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> <span class=\"hljs-title function_\">lfsr<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> state)<\/span> {\r\n    <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> lsb = state &amp; <span class=\"hljs-number\">1<\/span>;\r\n    state &gt;&gt;= <span class=\"hljs-number\">1<\/span>;\r\n    <span class=\"hljs-keyword\">if<\/span> (lsb)\r\n        state ^= <span class=\"hljs-number\">0x1B<\/span>;  <span class=\"hljs-comment\">\/\/ GMS\u52a0\u5bc6\u7b97\u6cd5\u6307\u5b9a\u7684\u591a\u9879\u5f0f<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> state;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ GSM\u52a0\u5bc6\u7b97\u6cd5<\/span>\r\n<span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">gsmEncrypt<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span>* key, <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span>* plaintext, <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span>* ciphertext, <span class=\"hljs-type\">int<\/span> length)<\/span> {\r\n    <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> state = <span class=\"hljs-number\">0x1<\/span>;  <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u72b6\u6001<\/span>\r\n    <span class=\"hljs-type\">int<\/span> i;\r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt; length; i++) {\r\n        state = lfsr(state);\r\n        ciphertext[i] = key[i] ^ state ^ plaintext[i];\r\n    }\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> key[] = {<span class=\"hljs-number\">0x7C<\/span>, <span class=\"hljs-number\">0x5B<\/span>, <span class=\"hljs-number\">0xCD<\/span>, <span class=\"hljs-number\">0x27<\/span>, <span class=\"hljs-number\">0x51<\/span>, <span class=\"hljs-number\">0x8D<\/span>, <span class=\"hljs-number\">0x8<\/span>, <span class=\"hljs-number\">0x68<\/span>};  <span class=\"hljs-comment\">\/\/ \u5bc6\u94a5<\/span>\r\n    <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> plaintext[] = {<span class=\"hljs-number\">0x12<\/span>, <span class=\"hljs-number\">0x34<\/span>, <span class=\"hljs-number\">0x56<\/span>, <span class=\"hljs-number\">0x78<\/span>};  <span class=\"hljs-comment\">\/\/ \u660e\u6587<\/span>\r\n    <span class=\"hljs-type\">int<\/span> length = <span class=\"hljs-keyword\">sizeof<\/span>(plaintext) \/ <span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span>);\r\n    <span class=\"hljs-type\">unsigned<\/span> <span class=\"hljs-type\">char<\/span> ciphertext[length];  <span class=\"hljs-comment\">\/\/ \u5bc6\u6587<\/span>\r\n\r\n    gsmEncrypt(key, plaintext, ciphertext, length);\r\n\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Ciphertext: \"<\/span>);\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; length; i++) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"%02X \"<\/span>, ciphertext[i]);\r\n    }\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\\n\"<\/span>);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001GSM\u6697\u53f7\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u6c7a\u3081\u3089\u308c\u305fLFSR\u591a\u9805\u5f0f(0x1B)\u3068\u521d\u671f\u72b6\u614b(0x1)\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u30ad\u30fc\u30b7\u30fc\u30b1\u30f3\u30b9\u3068\u5e73\u6587\u30921\u30d0\u30a4\u30c8\u305a\u3064\u6392\u4ed6\u7684\u8ad6\u7406\u548c\u6f14\u7b97\u3057\u3001\u6697\u53f7\u6587\u306b\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u6697\u53f7\u6587\u309216\u9032\u6570\u5f62\u5f0f\u3067\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u7c21\u7d20\u5316\u3055\u308c\u305f\u4f8b\u3067\u3042\u308a\u3001\u73fe\u5b9f\u7684\u306a\u7528\u9014\u3067\u306f\u3001\u30ad\u30fc\u7ba1\u7406\u3084\u30d1\u30c7\u30a3\u30f3\u30b0\u30b9\u30ad\u30fc\u30e0\u306a\u3069\u3001\u8003\u616e\u3059\u3079\u304d\u8ffd\u52a0\u8981\u7d20\u304c\u6570\u591a\u304f\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5b9f\u7a3c\u50cd\u74b0\u5883\u3067\u306f\u3001\u65e2\u306b\u5b9f\u88c5\u304a\u3088\u3073\u30c6\u30b9\u30c8\u6e08\u307f\u306e\u4fe1\u983c\u3067\u304d\u308b\u6697\u53f7\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4f7f\u7528\u3092\u63a8\u5968\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u3092\u53c2\u7167\u3057\u307e\u3059\u3002 GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7406\u89e3\u3059\u308b: GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u3067\u3042\u308a\u3001\u7dda\u5f62\u5e30\u9084\u30b7\u30d5\u30c8\u30ec\u30b8\u30b9\u30bf(Linear Feedback Shift R [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-87922","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u8a00\u8a9e\u3067GSM\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u304b - Blog - Silicon 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