質問編集履歴
1
暗号化のソースを追記しました。
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File without changes
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body
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@@ -10,12 +10,64 @@
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10
10
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```c#
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11
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static void Main()
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{
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string sfile = @"C:\test\enc.txt"; //暗号化前ファイル
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string dfile = @"C:\test\dec.txt"; //暗号化ファイル
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string efile = @"C:\test\out.txt"; //復号ファイル
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string key = @"hoge"; //パスワード
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AesEnc(sfile, dfile, key);
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-
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AesDec(dfile, efile, key);
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}
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//暗号化
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static void AesEnc(string sFile, string dFile, string key)
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{
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AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
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aes.BlockSize = 128;
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aes.KeySize = 128;
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.PKCS7;
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aes.GenerateIV();
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byte[] byteIV = aes.IV;
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byte[] bytesPassword = Encoding.UTF8.GetBytes(key);
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byte[] bytesKey = new byte[16];
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for (int i = 0; i < 16; i++)
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{
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if (i < bytesPassword.Length)
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{
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bytesKey[i] = bytesPassword[i];
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}
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else
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{
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bytesKey[i] = 0; }
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}
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aes.Key = bytesKey;
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ICryptoTransform encrypt = aes.CreateEncryptor();
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FileStream outfs = new FileStream(dFile, FileMode.Create, FileAccess.Write);
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outfs.Write(byteIV, 0, 16);
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CryptoStream cs = new CryptoStream(outfs, encrypt, CryptoStreamMode.Write);
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FileStream fs = new FileStream(sFile, FileMode.Open, FileAccess.Read);
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byte[] buf = new byte[1024];
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int len;
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while ((len = fs.Read(buf, 0, buf.Length)) > 0)
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{
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cs.Write(buf, 0, len);
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}
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fs.Close();
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cs.Close();
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encrypt.Dispose();
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outfs.Close();
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}
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//復号
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static void AesDec(string sFile, string dFile, string key)
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{
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AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
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