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copied!<p>@CodesInChaos was right, it was an endianness problem.</p> <p>I have used a function "OS2IP" taken from <a href="http://www.codeproject.com/Articles/421656/RSA-Library-with-Private-Key-Encryption-in-Csharp" rel="nofollow">here</a>. Just used it to generate the BigInteger from the byte array.</p> <pre><code>Dim P As Numerics.BigInteger = cripto.OS2IP(Convert.FromBase64String("gbb1FjTyN ... hs="), false) </code></pre> <p>Then I had to reverse the generated byte array:</p> <pre><code>Dim ResultBytes As Byte() = cripto.RSA_Decrypt(P, Q, D, Data).Reverse.ToArray </code></pre> <p>And the function that corrects the endianness:</p> <pre><code>''' <summary> ''' Converts a byte array to a non-negative integer. ''' </summary> ''' <param name="data">The number in the form of a byte array.</param> ''' <param name="isLittleEndian">Endianness of the byte array.</param> ''' <returns>An non-negative integer from the byte array of the specified endianness.</returns> Public Shared Function OS2IP(data As Byte(), isLittleEndian As Boolean) As Numerics.BigInteger Dim bi As Numerics.BigInteger = 0 If isLittleEndian Then For i As Integer = 0 To data.Length - 1 bi += Numerics.BigInteger.Pow(256, i) * data(i) Next Else For i As Integer = 1 To data.Length bi += Numerics.BigInteger.Pow(256, i - 1) * data(data.Length - i) Next End If Return bi End Function </code></pre> <p>With that change, the result is now correct. Now I will look at the timing-attack issue :)</p>

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