{"id":33134,"date":"2023-02-04T19:18:25","date_gmt":"2023-02-04T13:48:25","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-aes-encryption-on-file-over-1gb\/"},"modified":"2023-02-04T19:18:25","modified_gmt":"2023-02-04T13:48:25","slug":"solved-aes-encryption-on-file-over-1gb","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-aes-encryption-on-file-over-1gb\/","title":{"rendered":"[Solved] AES encryption on file over 1GB"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-34004582\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"34004582\" data-parentid=\"34004129\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You are reading the entire file at the start of the method:<\/p>\n<pre><code>byte[] bytesToBeEncrypted = File.ReadAllBytes(file); \n<\/code><\/pre>\n<p>This is causing the OutOfMemoryException. Here&#8217;s <strong>an idea<\/strong> of how you&#8217;d do this:<\/p>\n<pre><code>static void EncryptFile(string file, string password)\n{\n    byte[] passwordBytes = Encoding.UTF8.GetBytes(password);\n    byte[] salt = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };\n\n    passwordBytes = SHA256.Create().ComputeHash(passwordBytes);\n\n    RijndaelManaged AES = new RijndaelManaged();\n    AES.KeySize = AES.LegalKeySizes[0].MaxSize;\n    AES.BlockSize = AES.LegalBlockSizes[0].MaxSize;\n    AES.Padding = PaddingMode.PKCS7;\n\n    \/\/\"What it does is repeatedly hash the user password along with the salt.\" High iteration counts.\n    using (var key = new Rfc2898DeriveBytes(passwordBytes, salt, 1000)) \/\/ automatically dispose key\n    {\n        AES.Key = key.GetBytes(AES.KeySize \/ 8);\n        AES.IV = key.GetBytes(AES.BlockSize \/ 8);\n        AES.Mode = CipherMode.CFB;\n    }\n    using (FileStream fsCrypt = new FileStream(file + \".enc\", FileMode.Create)) \/\/ automatically dispose fsCrypt\n    {\n        \/\/write salt to the beginning of the output file, so in this case can be random every time\n        fsCrypt.Write(salt, 0, salt.Length);\n    }\n\n    int bytesToRead = 128 * 1024 * 1024; \/\/ 128MB \n    byte[] buffer = new byte[bytesToRead]; \/\/ create the array that will be used encrypted\n    long fileOffset = 0;\n    int read = 0;\n    bool allRead = false;\n\n    while (!allRead)\n    {\n       using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))\n       {\n           fs.Seek(fileOffset, SeekOrigin.Begin); \/\/ continue reading from where we were...\n           read = fs.Read(buffer, 0, bytesToRead); \/\/ read the next chunk\n       }\n\n       if (read == 0)\n           allRead = true;\n       else\n           fileOffset += read;\n\n       using (FileStream fsCrypt = new FileStream(file + \".enc\", FileMode.Open)) \/\/ automatically dispose fsCrypt\n       {\n           using (CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write))\n           {\n               fsCrypt.Seek(fileOffset, SeekOrigin.End);\n               cs.Write(buffer, 0, read);\n           }\n        }\n    }\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">9<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved AES encryption on file over 1GB <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You are reading the entire file at the start of the method: byte[] bytesToBeEncrypted = File.ReadAllBytes(file); This is causing the OutOfMemoryException. Here&#8217;s an idea of how you&#8217;d do this: static void EncryptFile(string file, string password) { byte[] passwordBytes = Encoding.UTF8.GetBytes(password); byte[] salt = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 &#8230; <a title=\"[Solved] AES encryption on file over 1GB\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-aes-encryption-on-file-over-1gb\/\" aria-label=\"More on [Solved] AES encryption on file over 1GB\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1319,324,557],"class_list":["post-33134","post","type-post","status-publish","format-standard","hentry","category-solved","tag-aes","tag-c","tag-encryption"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] AES encryption on file over 1GB - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-aes-encryption-on-file-over-1gb\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] AES encryption on file over 1GB - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are reading the entire file at the start of the method: byte[] bytesToBeEncrypted = File.ReadAllBytes(file); This is causing the OutOfMemoryException. Here&#8217;s an idea of how you&#8217;d do this: static void EncryptFile(string file, string password) { byte[] passwordBytes = Encoding.UTF8.GetBytes(password); byte[] salt = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 ... 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Here&#8217;s an idea of how you&#8217;d do this: static void EncryptFile(string file, string password) { byte[] passwordBytes = Encoding.UTF8.GetBytes(password); byte[] salt = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 ... 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