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POHow do I decrypt a file with Crypto++ that was encrypted with C#
 

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  1. POHow do I decrypt a file with Crypto++ that was encrypted with C#
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    <p><br>I would like to decrypt a file that I previously encrypted with C# using the TripleDESCryptoServiceProvider. <br>Here's my code for encrypting:</p> <pre><code>private static void EncryptData(MemoryStream streamToEncrypt) { // initialize the encryption algorithm TripleDES algorithm = new TripleDESCryptoServiceProvider(); byte[] desIV = new byte[8]; byte[] desKey = new byte[16]; for (int i = 0; i &lt; 8; ++i) { desIV[i] = (byte)i; } for (int j = 0; j &lt; 16; ++j) { desKey[j] = (byte)j; } FileStream outputStream = new FileStream(TheCryptedSettingsFilePath, FileMode.OpenOrCreate, FileAccess.Write); outputStream.SetLength(0); CryptoStream encStream = new CryptoStream(outputStream, algorithm.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write); // write the encrypted data to the file encStream.Write(streamToEncrypt.ToArray(), 0, (int)streamToEncrypt.Length); encStream.Close(); outputStream.Close(); } </code></pre> <p>I already found the Crypto++ library and managed to build and link it. So I tried to decrypt the file that was stored with C# after the encryption with the following (native) C++ code:</p> <pre><code>FILE *fp; long len; char *buf; if (_wfopen_s(&amp;fp, _T("MyTest.bin"), _T("rb")) != 0) { return false; } fseek(fp ,0 ,SEEK_END); //go to end len = ftell(fp); //get position at end (length) fseek(fp, 0, SEEK_SET); //go to beg. buf = (char *)malloc(len); //malloc buffer fread(buf, len, 1, fp); //read into buffer fclose(fp); BYTE pIV[] = {0, 1, 2, 3, 4, 5, 6, 7}; BYTE pKey[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}; const BYTE* lpData = (const BYTE*)(LPCTSTR)buf; size_t bufferSize = strlen(buf); BYTE* result = (BYTE *)malloc(bufferSize); CFB_FIPS_Mode&lt;DES_EDE2&gt;::Decryption decryption_DES_EDE2_CFB; decryption_DES_EDE2_CFB.SetKeyWithIV(pKey, sizeof(pKey), pIV, sizeof(pIV)); decryption_DES_EDE2_CFB.ProcessString(result, lpData, bufferSize); </code></pre> <p>That code won't decrypt properly. The result after the decryption doesn't match the plain text that was encrypted previously. Any idea about my code?</p>
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