{"id":37027,"date":"2023-03-29T08:23:34","date_gmt":"2022-12-13T07:15:32","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/"},"modified":"2024-04-29T20:58:27","modified_gmt":"2024-04-29T12:58:27","slug":"%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/","title":{"rendered":"\u65f6\u95f4\u6233\u9a8c\u8bc1"},"content":{"rendered":"
import<\/span> java.security.*<\/span>;<\/span>\r\nimport<\/span> java.security.spec.InvalidKeySpecException<\/span>;<\/span>\r\nimport<\/span> java.security.spec.PKCS8EncodedKeySpec<\/span>;<\/span>\r\nimport<\/span> java.security.spec.X509EncodedKeySpec<\/span>;<\/span>\r\nimport<\/span> java.util.Base64<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> TimestampAuthentication<\/span> {<\/span>\r\n    private<\/span> static<\/span> final<\/span> String<\/span> ALGORITHM<\/span> =<\/span> \"SHA256withRSA\"<\/span>;<\/span>\r\n\r\n    public<\/span> static<\/span> boolean<\/span> verifyTimestamp<\/span>(<\/span>String<\/span> message<\/span>,<\/span> String<\/span> timestamp<\/span>,<\/span> String<\/span> signature<\/span>,<\/span> String<\/span> publicKey<\/span>)<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            byte<\/span>[]<\/span> publicKeyBytes<\/span> =<\/span> Base64<\/span>.<\/span>getDecoder<\/span>().<\/span>decode<\/span>(<\/span>publicKey<\/span>);<\/span>\r\n            byte<\/span>[]<\/span> signatureBytes<\/span> =<\/span> Base64<\/span>.<\/span>getDecoder<\/span>().<\/span>decode<\/span>(<\/span>signature<\/span>);<\/span>\r\n\r\n            PublicKey<\/span> pubKey<\/span> =<\/span> KeyFactory<\/span>.<\/span>getInstance<\/span>(<\/span>\"RSA\"<\/span>).<\/span>generatePublic<\/span>(<\/span>new<\/span> X509EncodedKeySpec<\/span>(<\/span>publicKeyBytes<\/span>));<\/span>\r\n\r\n            Signature<\/span> verifier<\/span> =<\/span> Signature<\/span>.<\/span>getInstance<\/span>(<\/span>ALGORITHM<\/span>);<\/span>\r\n            verifier<\/span>.<\/span>initVerify<\/span>(<\/span>pubKey<\/span>);<\/span>\r\n            verifier<\/span>.<\/span>update<\/span>(<\/span>message<\/span>.<\/span>getBytes<\/span>());<\/span>\r\n\r\n            return<\/span> verifier<\/span>.<\/span>verify<\/span>(<\/span>signatureBytes<\/span>);<\/span>\r\n        }<\/span> catch<\/span> (<\/span>NoSuchAlgorithmException<\/span> |<\/span> InvalidKeySpecException<\/span> |<\/span> InvalidKeyException<\/span> |<\/span> SignatureException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n\r\n        return<\/span> false<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> message<\/span> =<\/span> \"Hello, world!\"<\/span>;<\/span>\r\n        String<\/span> timestamp<\/span> =<\/span> \"2023-06-18T12:34:56\"<\/span>;<\/span>\r\n        String<\/span> signature<\/span> =<\/span> \"SIGNATURE\"<\/span>;<\/span> \/\/ \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u7f72\u540d\u3057\u305f\u30c7\u30fc\u30bf<\/span>\r\n        String<\/span> publicKey<\/span> =<\/span> \"PUBLIC_KEY\"<\/span>;<\/span> \/\/ \u30b5\u30fc\u30d0\u30fc\u3067\u5171\u6709\u3055\u308c\u305f\u516c\u958b\u9375<\/span>\r\n\r\n        boolean<\/span> isVerified<\/span> =<\/span> verifyTimestamp<\/span>(<\/span>message<\/span>,<\/span> timestamp<\/span>,<\/span> signature<\/span>,<\/span> publicKey<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"Timestamp Verification: \"<\/span> +<\/span> isVerified<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
import<\/span> org.apache.commons.codec.digest.DigestUtils<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.PDDocument<\/span>;<\/span>\r\n\r\nimport<\/span> java.io.File<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\nimport<\/span> java.nio.file.Files<\/span>;<\/span>\r\nimport<\/span> java.nio.file.Path<\/span>;<\/span>\r\nimport<\/span> java.security.MessageDigest<\/span>;<\/span>\r\nimport<\/span> java.security.NoSuchAlgorithmException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> PDFValidation<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            \/\/ PDF\u3092\u8aad\u307f\u8fbc\u3080<\/span>\r\n            PDDocument<\/span> document<\/span> =<\/span> PDDocument<\/span>.<\/span>load<\/span>(<\/span>new<\/span> File<\/span>(<\/span>\"path\/to\/your\/pdf\/file.pdf\"<\/span>));<\/span>\r\n\r\n            \/\/ \u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u30c7\u30fc\u30bf\u304b\u3089\u30c8\u30fc\u30af\u30f3\u751f\u6210<\/span>\r\n            String<\/span> timestampData<\/span> =<\/span> \"2023-07-10 12:34:56\"<\/span>;<\/span> \/\/ \u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u30c7\u30fc\u30bf\u306e\u4f8b<\/span>\r\n            byte<\/span>[]<\/span> timestampBytes<\/span> =<\/span> timestampData<\/span>.<\/span>getBytes<\/span>();<\/span>\r\n            byte<\/span>[]<\/span> tokenBytes<\/span> =<\/span> MessageDigest<\/span>.<\/span>getInstance<\/span>(<\/span>\"SHA-256\"<\/span>).<\/span>digest<\/span>(<\/span>timestampBytes<\/span>);<\/span>\r\n            String<\/span> token<\/span> =<\/span> DigestUtils<\/span>.<\/span>sha256Hex<\/span>(<\/span>timestampBytes<\/span>);<\/span> \/\/ Apache Commons Codec\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408<\/span>\r\n\r\n            \/\/ \u751f\u6210\u3055\u308c\u305f\u30c8\u30fc\u30af\u30f3\u3092\u5229\u7528\u3057\u3066\u9069\u5207\u306a\u51e6\u7406\u3092\u5b9f\u884c<\/span>\r\n\r\n            \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306b\u5fc5\u305a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u9589\u3058\u308b<\/span>\r\n            document<\/span>.<\/span>close<\/span>();<\/span>\r\n        }<\/span> catch<\/span> (<\/span>IOException<\/span> |<\/span> NoSuchAlgorithmException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
import<\/span> org.apache.pdfbox.cos.COSDictionary<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.cos.COSName<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.PDDocument<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.common.PDStream<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.graphics.PDXObject<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject<\/span>;<\/span>\r\nimport<\/span> org.apache.pdfbox.pdmodel.font.PDFont<\/span>;<\/span>\r\n\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\nimport<\/span> java.security.MessageDigest<\/span>;<\/span>\r\nimport<\/span> java.security.NoSuchAlgorithmException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> PDFValidation<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            \/\/ PDF\u3092\u8aad\u307f\u8fbc\u3080<\/span>\r\n            PDDocument<\/span> document<\/span> =<\/span> PDDocument<\/span>.<\/span>load<\/span>(<\/span>new<\/span> File<\/span>(<\/span>\"path\/to\/your\/pdf\/file.pdf\"<\/span>));<\/span>\r\n\r\n            \/\/ \u30c8\u30fc\u30af\u30f3\u518d\u751f\u6210\u3068\u30cf\u30c3\u30b7\u30e5\u5024\u691c\u8a3c<\/span>\r\n            for<\/span> (<\/span>int<\/span> pageNum<\/span> =<\/span> 0<\/span>;<\/span> pageNum<\/span> <<\/span> document<\/span>.<\/span>getNumberOfPages<\/span>();<\/span> pageNum<\/span>++)<\/span> {<\/span>\r\n                PDPage<\/span> page<\/span> =<\/span> document<\/span>.<\/span>getPage<\/span>(<\/span>pageNum<\/span>);<\/span>\r\n                \r\n                \/\/ \u30c6\u30ad\u30b9\u30c8\u30c8\u30fc\u30af\u30f3\u306e\u518d\u751f\u6210<\/span>\r\n                PDFTextStripper<\/span> stripper<\/span> =<\/span> new<\/span> PDFTextStripper<\/span>();<\/span>\r\n                stripper<\/span>.<\/span>setStartPage<\/span>(<\/span>pageNum<\/span> +<\/span> 1<\/span>);<\/span>\r\n                stripper<\/span>.<\/span>setEndPage<\/span>(<\/span>pageNum<\/span> +<\/span> 1<\/span>);<\/span>\r\n                String<\/span> text<\/span> =<\/span> stripper<\/span>.<\/span>getText<\/span>(<\/span>document<\/span>);<\/span>\r\n                byte<\/span>[]<\/span> textBytes<\/span> =<\/span> text<\/span>.<\/span>getBytes<\/span>();<\/span>\r\n                byte<\/span>[]<\/span> textHash<\/span> =<\/span> MessageDigest<\/span>.<\/span>getInstance<\/span>(<\/span>\"SHA-256\"<\/span>).<\/span>digest<\/span>(<\/span>textBytes<\/span>);<\/span>\r\n                \/\/ \u30cf\u30c3\u30b7\u30e5\u5024\u306e\u691c\u8a3c\u306a\u3069\u3001\u9069\u5207\u306a\u51e6\u7406\u3092\u5b9f\u884c<\/span>\r\n                \r\n                \/\/ \u753b\u50cf\u30c8\u30fc\u30af\u30f3\u306e\u518d\u751f\u6210<\/span>\r\n                for<\/span> (<\/span>COSName<\/span> key<\/span> :<\/span> page<\/span>.<\/span>getResources<\/span>().<\/span>getXObjectNames<\/span>())<\/span> {<\/span>\r\n                    PDXObject<\/span> object<\/span> =<\/span> page<\/span>.<\/span>getResources<\/span>().<\/span>getXObject<\/span>(<\/span>key<\/span>);<\/span>\r\n                    if<\/span> (<\/span>object<\/span> instanceof<\/span> PDImageXObject<\/span>)<\/span> {<\/span>\r\n                        PDImageXObject<\/span> imageObject<\/span> =<\/span> (<\/span>PDImageXObject<\/span>)<\/span> object<\/span>;<\/span>\r\n                        COSDictionary<\/span> dictionary<\/span> =<\/span> imageObject<\/span>.<\/span>getCOSObject<\/span>();<\/span>\r\n                        PDStream<\/span> stream<\/span> =<\/span> new<\/span> PDStream<\/span>(<\/span>dictionary<\/span>);<\/span>\r\n                        byte<\/span>[]<\/span> imageBytes<\/span> =<\/span> stream<\/span>.<\/span>toByteArray<\/span>();<\/span>\r\n                        byte<\/span>[]<\/span> imageHash<\/span> =<\/span> MessageDigest<\/span>.<\/span>getInstance<\/span>(<\/span>\"SHA-256\"<\/span>).<\/span>digest<\/span>(<\/span>imageBytes<\/span>);<\/span>\r\n                        \/\/ \u30cf\u30c3\u30b7\u30e5\u5024\u306e\u691c\u8a3c\u306a\u3069\u3001\u9069\u5207\u306a\u51e6\u7406\u3092\u5b9f\u884c<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n                \r\n                \/\/ \u30d5\u30a9\u30f3\u30c8\u30c8\u30fc\u30af\u30f3\u306e\u518d\u751f\u6210<\/span>\r\n                for<\/span> (<\/span>COSName<\/span> key<\/span> :<\/span> page<\/span>.<\/span>getResources<\/span>().<\/span>getFontNames<\/span>())<\/span> {<\/span>\r\n                    PDFont<\/span> font<\/span> =<\/span> page<\/span>.<\/span>getResources<\/span>().<\/span>getFont<\/span>(<\/span>key<\/span>);<\/span>\r\n                    COSDictionary<\/span> dictionary<\/span> =<\/span> font<\/span>.<\/span>getCOSObject<\/span>();<\/span>\r\n                    PDStream<\/span> stream<\/span> =<\/span> new<\/span> PDStream<\/span>(<\/span>dictionary<\/span>);<\/span>\r\n                    byte<\/span>[]<\/span> fontBytes<\/span> =<\/span> stream<\/span>.<\/span>toByteArray<\/span>();<\/span>\r\n                    byte<\/span>[]<\/span> fontHash<\/span> =<\/span> MessageDigest<\/span>.<\/span>getInstance<\/span>(<\/span>\"SHA-256\"<\/span>).<\/span>digest<\/span>(<\/span>fontBytes<\/span>);<\/span>\r\n                    \/\/ \u30cf\u30c3\u30b7\u30e5\u5024\u306e\u691c\u8a3c\u306a\u3069\u3001\u9069\u5207\u306a\u51e6\u7406\u3092\u5b9f\u884c<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n            \r\n            \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306b\u5fc5\u305a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u9589\u3058\u308b<\/span>\r\n            document<\/span>.<\/span>close<\/span>();<\/span>\r\n        }<\/span> catch<\/span> (<\/span>IOException<\/span> |<\/span> NoSuchAlgorithmException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
import java.security.*; import java.security.spec.Inval […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-37027","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u65f6\u95f4\u6233\u9a8c\u8bc1 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u65f6\u95f4\u6233\u9a8c\u8bc1\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u65f6\u95f4\u6233\u9a8c\u8bc1\" \/>\n<meta property=\"og:description\" content=\"import java.security.*; import java.security.spec.Inval […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u65f6\u95f4\u6233\u9a8c\u8bc1\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-13T07:15:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T12:58:27+00:00\" \/>\n<meta name=\"author\" content=\"\u5b87, \u534e\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u5b87, \u534e\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/\",\"name\":\"\u65f6\u95f4\u6233\u9a8c\u8bc1 - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\"},\"datePublished\":\"2022-12-13T07:15:32+00:00\",\"dateModified\":\"2024-04-29T12:58:27+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/513018e4e121d3add1b7c5de8be21458\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/zh\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u65f6\u95f4\u6233\u9a8c\u8bc1\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/\",\"name\":\"Blog - Silicon Cloud\",\"description\":\"\",\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/513018e4e121d3add1b7c5de8be21458\",\"name\":\"\u5b87, \u534e\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/63cd45cbc05a35fc4ff7637a163c83c4962ef58d27472726c3a3e0c9c5194f0f?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/63cd45cbc05a35fc4ff7637a163c83c4962ef58d27472726c3a3e0c9c5194f0f?s=96&d=mm&r=g\",\"caption\":\"\u5b87, \u534e\"},\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/author\/yuhua\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%97%b6%e9%97%b4%e6%88%b3%e9%aa%8c%e8%af%81\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"\u65f6\u95f4\u6233\u9a8c\u8bc1 - Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/zh\/blog\/\u65f6\u95f4\u6233\u9a8c\u8bc1\/","og_locale":"zh_CN","og_type":"article","og_title":"\u65f6\u95f4\u6233\u9a8c\u8bc1","og_description":"import java.security.*; 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