<\/p>\n
\u7b80\u5355\u5b8c\u6574\u7684\u4ee3\u7801\uff0c\u901a\u8fc7\u8fd9\u4e2a\u4ee3\u7801\u4f60\u5c06\u5bf9RSA\u52a0\u5bc6\u7b97\u6cd5\u5728Java\u4e2d\u7684\u5b9e\u73b0\u65b9\u6cd5\u6709\u4e00\u4e2a\u521d\u6b65\u7684\u4e86\u89e3\uff0c\u8fd9\u4e2a\u7c7b\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\uff0c\u6c34\u5e73\u9ad8\u7684\uff0c\u5c31\u81ea\u5df1\u4fee\u6539\u5b8c\u5584\u4e0b\u4ee3\u7801\u3002<\/p>\n
package security;\r\nimport java.security.*;\r\nimport java.security.spec.*;\r\nimport java.security.interfaces.*;\r\nimport javax.crypto.spec.*;\r\nimport javax.crypto.interfaces.*;\r\nimport java.io.*;\r\nimport java.math.*;\r\npublic<\/span> class<\/span> RSADemo {\r\npublic<\/span> RSADemo() {\r\n}\r\npublic<\/span> static<\/span> void<\/span> generateKey() {\r\ntry<\/span> {\r\nKeyPairGenerator kpg = KeyPairGenerator.getInstance(\"RSA\"<\/span>);\r\nkpg.initialize(1024<\/span>);\r\nKeyPair kp = kpg.genKeyPair();\r\nPublicKey pbkey = kp.getPublic();\r\nPrivateKey prkey = kp.getPrivate();\r\n\/\/ \u4fdd\u5b58\u516c\u94a5<\/span>\r\nFileOutputStream f1 = new<\/span> FileOutputStream(\"pubkey.dat\"<\/span>);\r\nObjectOutputStream b1 = new<\/span> ObjectOutputStream(f1);\r\nb1.writeObject(pbkey);\r\n\/\/ \u4fdd\u5b58\u79c1\u94a5<\/span>\r\nFileOutputStream f2 = new<\/span> FileOutputStream(\"privatekey.dat\"<\/span>);\r\nObjectOutputStream b2 = new<\/span> ObjectOutputStream(f2);\r\nb2.writeObject(prkey);\r\n} catch<\/span> (Exception e) {\r\n}\r\n}\r\npublic<\/span> static<\/span> void<\/span> encrypt() throws Exception {\r\nString s = \"Hello World!\"<\/span>;\r\n\/\/ \u83b7\u53d6\u516c\u94a5\u53ca\u53c2\u6570e,n<\/span>\r\nFileInputStream f = new<\/span> FileInputStream(\"pubkey.dat\"<\/span>);\r\nObjectInputStream b = new<\/span> ObjectInputStream(f);\r\nRSAPublicKey pbk = (RSAPublicKey) b.readObject();\r\nBigInteger e = pbk.getPublicExponent();\r\nBigInteger n = pbk.getModulus();\r\nSystem.out<\/span>.println(\"e= \"<\/span> + e);\r\nSystem.out<\/span>.println(\"n= \"<\/span> + n);\r\n\/\/ \u83b7\u53d6\u660e\u6587m<\/span>\r\nbyte<\/span> ptext[] = s.getBytes(\"UTF-8\"<\/span>);\r\nBigInteger m = new<\/span> BigInteger(ptext);\r\n\/\/ \u8ba1\u7b97\u5bc6\u6587c<\/span>\r\nBigInteger c = m.modPow(e, n);\r\nSystem.out<\/span>.println(\"c= \"<\/span> + c);\r\n\/\/ \u4fdd\u5b58\u5bc6\u6587<\/span>\r\nString cs = c.toString();\r\nBufferedWriter out<\/span> =\r\nnew<\/span> BufferedWriter(\r\nnew<\/span> OutputStreamWriter(new<\/span> FileOutputStream(\"encrypt.dat\"<\/span>)));\r\nout<\/span>.write(cs, 0<\/span>, cs.length());\r\nout<\/span>.close();\r\n}\r\npublic<\/span> static<\/span> void<\/span> decrypt() throws Exception {\r\n\/\/ \u8bfb\u53d6\u5bc6\u6587<\/span>\r\nBufferedReader in<\/span> =\r\nnew<\/span> BufferedReader(\r\nnew<\/span> InputStreamReader(new<\/span> FileInputStream(\"encrypt.dat\"<\/span>)));\r\nString ctext = in<\/span>.readLine();\r\nBigInteger c = new<\/span> BigInteger(ctext);\r\n\/\/ \u8bfb\u53d6\u79c1\u94a5<\/span>\r\nFileInputStream f = new<\/span> FileInputStream(\"privatekey.dat\"<\/span>);\r\nObjectInputStream b = new<\/span> ObjectInputStream(f);\r\nRSAPrivateKey prk = (RSAPrivateKey) b.readObject();\r\nBigInteger d = prk.getPrivateExponent();\r\n\/\/ \u83b7\u53d6\u79c1\u94a5\u53c2\u6570\u53ca\u89e3\u5bc6<\/span>\r\nBigInteger n = prk.getModulus();\r\nSystem.out<\/span>.println(\"d= \"<\/span> + d);\r\nSystem.out<\/span>.println(\"n= \"<\/span> + n);\r\nBigInteger m = c.modPow(d, n);\r\n\/\/ \u663e\u793a\u89e3\u5bc6\u7ed3\u679c<\/span>\r\nSystem.out<\/span>.println(\"m= \"<\/span> + m);\r\nbyte<\/span>[] mt = m.toByteArray();\r\nSystem.out<\/span>.println(\"PlainText is \"<\/span>);\r\nfor<\/span> (int<\/span> i = 0<\/span>; i < mt.length; i++) {\r\nSystem.out<\/span>.print((char<\/span>) mt[i]);\r\n}\r\n}\r\npublic<\/span> static<\/span> void<\/span> main(String args[]) {\r\ntry<\/span> {\r\ngenerateKey();\r\nencrypt();\r\ndecrypt();\r\n} catch<\/span> (Exception e) {\r\nSystem.out<\/span>.println(e.toString());\r\n}\r\n}\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":" \u7b80\u5355\u5b8c\u6574\u7684\u4ee3\u7801\uff0c\u901a\u8fc7\u8fd9\u4e2a\u4ee3\u7801\u4f60\u5c06\u5bf9RSA\u52a0\u5bc6\u7b97\u6cd5\u5728Java\u4e2d\u7684\u5b9e\u73b0\u65b9\u6cd5\u6709\u4e00\u4e2a\u521d\u6b65\u7684\u4e86\u89e3\uff0c\u8fd9\u4e2a\u7c7b\uff0c … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/posts\/1209"}],"collection":[{"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1209"}],"version-history":[{"count":1,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/posts\/1209\/revisions"}],"predecessor-version":[{"id":1210,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=\/wp\/v2\/posts\/1209\/revisions\/1210"}],"wp:attachment":[{"href":"https:\/\/wx.wosign.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wx.wosign.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}