{"id":82392,"date":"2024-03-21T01:24:16","date_gmt":"2024-03-20T16:24:16","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%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%81%ae%e9%81%a9%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-12T21:05:56","modified_gmt":"2025-08-12T12:05:56","slug":"java%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%81%ae%e9%81%a9%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%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%81%ae%e9%81%a9%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u7528\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u3057\u3066\u3001DES\u3001AES\u3001RSA\u306a\u3069\u304c\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3053\u308c\u3089\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5229\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>DES\u6697\u53f7\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5fdc\u7528\u4f8b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> javax.crypto.*;\r\n<span class=\"hljs-keyword\">import<\/span> javax.crypto.spec.DESKeySpec;\r\n<span class=\"hljs-keyword\">import<\/span> javax.crypto.spec.SecretKeySpec;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.InvalidKeyException;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.Key;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.NoSuchAlgorithmException;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.spec.InvalidKeySpecException;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">DESExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidKeySpecException, BadPaddingException, IllegalBlockSizeException {\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">plaintext<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello, world!\"<\/span>;\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">keyString<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"mysecretkey\"<\/span>; <span class=\"hljs-comment\">\/\/ \u5bc6\u94a5\uff0c\u957f\u5ea6\u5fc5\u987b\u4e3a8\u5b57\u8282<\/span>\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u751f\u6210\u5bc6\u94a5<\/span>\r\n        <span class=\"hljs-type\">SecretKeyFactory<\/span> <span class=\"hljs-variable\">keyFactory<\/span> <span class=\"hljs-operator\">=<\/span> SecretKeyFactory.getInstance(<span class=\"hljs-string\">\"DES\"<\/span>);\r\n        <span class=\"hljs-type\">DESKeySpec<\/span> <span class=\"hljs-variable\">desKeySpec<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DESKeySpec<\/span>(keyString.getBytes());\r\n        <span class=\"hljs-type\">SecretKey<\/span> <span class=\"hljs-variable\">secretKey<\/span> <span class=\"hljs-operator\">=<\/span> keyFactory.generateSecret(desKeySpec);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u52a0\u5bc6\u5668<\/span>\r\n        <span class=\"hljs-type\">Cipher<\/span> <span class=\"hljs-variable\">cipher<\/span> <span class=\"hljs-operator\">=<\/span> Cipher.getInstance(<span class=\"hljs-string\">\"DES\/ECB\/PKCS5Padding\"<\/span>);\r\n        cipher.init(Cipher.ENCRYPT_MODE, secretKey);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u52a0\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] encryptedBytes = cipher.doFinal(plaintext.getBytes());\r\n        System.out.println(<span class=\"hljs-string\">\"Encrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(encryptedBytes));\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u89e3\u5bc6\u5668<\/span>\r\n        cipher.init(Cipher.DECRYPT_MODE, secretKey);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u89e3\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] decryptedBytes = cipher.doFinal(encryptedBytes);\r\n        System.out.println(<span class=\"hljs-string\">\"Decrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(decryptedBytes));\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>AES \u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u7528\u4f8b:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> javax.crypto.*;\r\n<span class=\"hljs-keyword\">import<\/span> javax.crypto.spec.SecretKeySpec;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.InvalidKeyException;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.Key;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.NoSuchAlgorithmException;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">AESExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">plaintext<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello, world!\"<\/span>;\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">keyString<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"mysecretkey123456\"<\/span>; <span class=\"hljs-comment\">\/\/ \u5bc6\u94a5\uff0c\u957f\u5ea6\u5fc5\u987b\u4e3a16\u5b57\u8282<\/span>\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u751f\u6210\u5bc6\u94a5<\/span>\r\n        <span class=\"hljs-type\">Key<\/span> <span class=\"hljs-variable\">key<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">SecretKeySpec<\/span>(keyString.getBytes(), <span class=\"hljs-string\">\"AES\"<\/span>);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u52a0\u5bc6\u5668<\/span>\r\n        <span class=\"hljs-type\">Cipher<\/span> <span class=\"hljs-variable\">cipher<\/span> <span class=\"hljs-operator\">=<\/span> Cipher.getInstance(<span class=\"hljs-string\">\"AES\/ECB\/PKCS5Padding\"<\/span>);\r\n        cipher.init(Cipher.ENCRYPT_MODE, key);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u52a0\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] encryptedBytes = cipher.doFinal(plaintext.getBytes());\r\n        System.out.println(<span class=\"hljs-string\">\"Encrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(encryptedBytes));\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u89e3\u5bc6\u5668<\/span>\r\n        cipher.init(Cipher.DECRYPT_MODE, key);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u89e3\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] decryptedBytes = cipher.doFinal(encryptedBytes);\r\n        System.out.println(<span class=\"hljs-string\">\"Decrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(decryptedBytes));\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>RSA\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u7528\u4f8b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> javax.crypto.Cipher;\r\n<span class=\"hljs-keyword\">import<\/span> java.nio.charset.StandardCharsets;\r\n<span class=\"hljs-keyword\">import<\/span> java.security.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">RSAExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">plaintext<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello, world!\"<\/span>;\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u751f\u6210\u5bc6\u94a5\u5bf9<\/span>\r\n        <span class=\"hljs-type\">KeyPairGenerator<\/span> <span class=\"hljs-variable\">keyGen<\/span> <span class=\"hljs-operator\">=<\/span> KeyPairGenerator.getInstance(<span class=\"hljs-string\">\"RSA\"<\/span>);\r\n        keyGen.initialize(<span class=\"hljs-number\">2048<\/span>);\r\n        <span class=\"hljs-type\">KeyPair<\/span> <span class=\"hljs-variable\">keyPair<\/span> <span class=\"hljs-operator\">=<\/span> keyGen.generateKeyPair();\r\n        <span class=\"hljs-type\">PublicKey<\/span> <span class=\"hljs-variable\">publicKey<\/span> <span class=\"hljs-operator\">=<\/span> keyPair.getPublic();\r\n        <span class=\"hljs-type\">PrivateKey<\/span> <span class=\"hljs-variable\">privateKey<\/span> <span class=\"hljs-operator\">=<\/span> keyPair.getPrivate();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u52a0\u5bc6\u5668<\/span>\r\n        <span class=\"hljs-type\">Cipher<\/span> <span class=\"hljs-variable\">cipher<\/span> <span class=\"hljs-operator\">=<\/span> Cipher.getInstance(<span class=\"hljs-string\">\"RSA\/ECB\/PKCS1Padding\"<\/span>);\r\n        cipher.init(Cipher.ENCRYPT_MODE, publicKey);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u52a0\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] encryptedBytes = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));\r\n        System.out.println(<span class=\"hljs-string\">\"Encrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(encryptedBytes));\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u89e3\u5bc6\u5668<\/span>\r\n        cipher.init(Cipher.DECRYPT_MODE, privateKey);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u89e3\u5bc6<\/span>\r\n        <span class=\"hljs-type\">byte<\/span>[] decryptedBytes = cipher.doFinal(encryptedBytes);\r\n        System.out.println(<span class=\"hljs-string\">\"Decrypted: \"<\/span> + <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(decryptedBytes));\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3089\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001DES\u3001AES\u3001RSA \u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u305d\u308c\u305e\u308c\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u3001\u30ad\u30fc\u306e\u751f\u6210\u3001\u6697\u53f7\u5316\u30c4\u30fc\u30eb\u306e\u4f5c\u6210\u3001\u6697\u53f7\u5316\u3068\u5fa9\u53f7\u5316\u306e\u64cd\u4f5c\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u30ad\u30fc\u306e\u9577\u3055\u306f\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u4f8b\u5916\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u6697\u53f7\u5316\u306b\u4f7f\u7528\u3055\u308c\u308b\u30ad\u30fc\u3068\u5fa9\u53f7\u5316\u306b\u4f7f\u7528\u3055\u308c\u308b\u30ad\u30fc\u306f\u4e00\u81f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u3057\u3066\u3001DES\u3001AES\u3001RSA\u306a\u3069\u304c\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3053\u308c\u3089\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5229\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002 DES\u6697\u53f7\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5fdc\u7528\u4f8b\uff1a import javax.crypto.*; impo [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-82392","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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>Java\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u7528\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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