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    <p>What you require is a method of generating "raw signatures". Raw signatures generally consist of modular exponentiation of PKCS#1 v1.5 compatible signature formats, although other padding methods may be used as well. The difference with a normal signing operation is that it <em>does not</em> perform any hashing, and - in the case of PKCS#1 v1.5 compatible signature formats - does not create the ASN.1 structure around the hash value, which is used to identify the hashing method used.</p> <p>This <em>raw signature formats</em> are not a standardized method of generating signatures and <em>should be avoided</em>. <code>private_encrypt</code> mainly is used to support deprecated versions of SSL, that uses the method to create a signature for authentication using a concatenation of the raw output of MD5 and SHA1 hash values.</p> <p>Finally, as Siva suggested, you may use the Bouncy Castle C# libraries to create raw signature formats. The raw signature format is not supported out of the box by most higher level API's, for the reasons given in the second paragraph.</p> <p>[EDIT2] To accomplish this you need to use the raw "RSA" functionality.</p> <pre><code>if (mechanism.Equals("RSA")) { return (new RsaDigestSigner(new NullDigest())); } </code></pre> <p>After that the <code>RsaDigestSigner</code> class will use the <code>EncodeBlock</code> method in <code>DigestInfo</code> to generate the PKCS#1 padding. The <code>NullDigest</code> does not do nothing, it just returns the data given to it as signature of itself.</p>
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    1. POReproducing Ruby OpenSSL private_encrypt output in C#
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    1. USMaarten Bodewes
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    1. COAnswer is somewhat late, I'm just going through some back log of older questions...
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