{"id":13683,"date":"2022-10-04T23:41:13","date_gmt":"2022-10-04T18:11:13","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-should-ibuffer-objects-generated-through-windows-security-cryptography-be-managed-securely\/"},"modified":"2022-10-04T23:41:13","modified_gmt":"2022-10-04T18:11:13","slug":"solved-how-should-ibuffer-objects-generated-through-windows-security-cryptography-be-managed-securely","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-should-ibuffer-objects-generated-through-windows-security-cryptography-be-managed-securely\/","title":{"rendered":"[Solved] How should IBuffer objects generated through Windows.Security.Cryptography be managed securely?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
\n
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You can wipe out the buffer if you like after use, even with C#. Here is a handy helper:<\/p>\n

public static class BufferExtensions\n{\n  public async static Task ClearContentsAsync(this IBuffer buff)\n  {\n    var writer = new DataWriter(buff.AsStream().AsOutputStream());\n    for (var i = 0; i < buff.Capacity; i++)\n      writer.WriteByte(42);\n    await writer.StoreAsync();\n  }\n}\n<\/code><\/pre>\n
Use it like this:<\/p>\n
  var buff = CryptographicBuffer.GenerateRandom(20);\n  var before = buff.ToArray();\n  await buff.ClearContentsAsync();\n  var after = buff.ToArray();\n  Debug.WriteLine(\"{0},{1},{2} - {3},{4},{5}\", \n    before[0], before[1], before[2], after[0], after[1], after[2]);\n<\/code><\/pre>\n
Note that the values in before<\/code> (copy taken before clearing) are random, but the values in after<\/code> (copy taken after clearing) are all 42. You can of course use a different value of your choice :-).<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            1<\/span> <\/p><\/div>\n<\/div>\n
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solved How should IBuffer objects generated through Windows.Security.Cryptography be managed securely? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You can wipe out the buffer if you like after use, even with C#. Here is a handy helper: public static class BufferExtensions { public async static Task ClearContentsAsync(this IBuffer buff) { var writer = new DataWriter(buff.AsStream().AsOutputStream()); for (var i = 0; i < buff.Capacity; i++) writer.WriteByte(42); await writer.StoreAsync(); } } Use it like … 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":[324,342,1741,2101],"class_list":["post-13683","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-security","tag-uwp","tag-windows-runtime"],"yoast_head":"\n[Solved] How should IBuffer objects generated through Windows.Security.Cryptography be managed securely? - 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-how-should-ibuffer-objects-generated-through-windows-security-cryptography-be-managed-securely\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How should IBuffer objects generated through Windows.Security.Cryptography be managed securely? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You can wipe out the buffer if you like after use, even with C#. Here is a handy helper: public static class BufferExtensions { public async static Task ClearContentsAsync(this IBuffer buff) { var writer = new DataWriter(buff.AsStream().AsOutputStream()); for (var i = 0; i < buff.Capacity; i++) writer.WriteByte(42); await writer.StoreAsync(); } } Use it like ... 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