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    <p>I can't answer as to why this works in C#, but as for Crypto++, there are a couple of issues.</p> <p><br> Firstly, you're probably invoking the wrong constructor of <a href="http://www.cryptopp.com/docs/ref/class_integer.html#a7fcab0564d7270017ebcca55bae1a17a" rel="nofollow"><code>Integer</code></a>. I guess you want this one which converts from big-endian byte array:</p> <pre><code>Integer (const byte *encodedInteger, size_t byteCount, Signedness s=UNSIGNED) </code></pre> <p>but are using <a href="http://www.cryptopp.com/docs/ref/class_integer.html#a9e8bf8c72458dff4ceb5d6cdf9e5c97a" rel="nofollow">this one</a> which convert from a string in base 2, 8, 10, or 16 (in your case base 10).</p> <p>So, using <code>ExponentCON</code> as an example, you should do:</p> <pre><code>const int ExponentSize(0x4); const byte ExponentCON[ExponentSize] = { 0x00, 0x01, 0x00, 0x01 }; Integer integ1(ExponentCON, ExponentSize); </code></pre> <p>or possibly better still:</p> <pre><code>std::string ExponentCON("101h"); // &lt;-- Note trailing 'h' indicating hex encoding Integer integ1(ExponentCON.c_str()); </code></pre> <p><br></p> <p>Next, the members of <code>InvertibleRSAFunction</code> must satisfy certain conditions in order to qualify as a valid key. These can be seen by stepping through the <a href="http://www.cryptopp.com/docs/ref/class_invertible_r_s_a_function.html#a35247205517f839220a16287917ce0ce" rel="nofollow"><code>InvertibleRSAFunction::Validate</code></a> function and I assume check for the conditions <a href="http://en.wikipedia.org/wiki/RSA_%28algorithm%29#Key_generation" rel="nofollow">described here</a>.</p> <pre><code>params.Validate(rng, 3); // Returns false for your input data </code></pre> <p><br> There are some helper functions which are designed to avoid having to set everything explicitly as you're doing. I don't know if these are suitable for you, but I'm referring to <a href="http://www.cryptopp.com/docs/ref/class_generatable_crypto_material.html#a38d492343c32e530a5c2781b5797f755" rel="nofollow"><code>InvertibleRSAFunction::GenerateRandomWithKeySize</code></a> and the overloaded <a href="http://www.cryptopp.com/docs/ref/class_invertible_r_s_a_function-members.html" rel="nofollow"><code>InvertibleRSAFunction::Initialize</code></a>.</p> <p>The <a href="http://www.cryptopp.com/wiki/RSA#Keys" rel="nofollow">Crypto++ Wiki</a> describes the use of these functions with example code.</p>
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    1. PORSASSA_PKCS1v15_SHA_Signer and PK_SignatureScheme::KeyTooShort exception
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    1. COAlright, thank you for that information. Even with this, is still didn't work, but I am happy with the information you gave me. Do you have any information on generating a key with the same sizes of above? Thanks.
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    2. CO@hetelek I think you would generally get sizes like these using `params.GenerateRandomWithKeySize(rng, 1024);`
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    3. CONow, I have not been able to tell. Does the "SignMessage" method take in the SHA1 hash of my data, or just my data? Thanks a ton for your help!
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