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    <p>You might take a look at <a href="http://www.jensign.com/" rel="noreferrer">JavaScience's</a> source for <a href="http://www.jensign.com/opensslkey/index.html" rel="noreferrer">OpenSSLKey</a>. (<a href="http://www.jensign.com/opensslkey/opensslkey.cs" rel="noreferrer">OpenSSLKey.cs</a>)</p> <p>There's code in there that does exactly what you want to do.</p> <p>In fact, they have a lot of crypto source code <a href="http://www.jensign.com/JavaScience/cryptoutils/index.html" rel="noreferrer">available here</a>.</p> <hr> <p>Source code snippet:</p> <pre><code>//------- Parses binary ans.1 RSA private key; returns RSACryptoServiceProvider --- public static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey) { byte[] MODULUS, E, D, P, Q, DP, DQ, IQ ; // --------- Set up stream to decode the asn.1 encoded RSA private key ------ MemoryStream mem = new MemoryStream(privkey) ; BinaryReader binr = new BinaryReader(mem) ; //wrap Memory Stream with BinaryReader for easy reading byte bt = 0; ushort twobytes = 0; int elems = 0; try { twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) binr.ReadByte(); //advance 1 byte else if (twobytes == 0x8230) binr.ReadInt16(); //advance 2 bytes else return null; twobytes = binr.ReadUInt16(); if (twobytes != 0x0102) //version number return null; bt = binr.ReadByte(); if (bt !=0x00) return null; //------ all private key components are Integer sequences ---- elems = GetIntegerSize(binr); MODULUS = binr.ReadBytes(elems); elems = GetIntegerSize(binr); E = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); D = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); P = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); Q = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); DP = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); DQ = binr.ReadBytes(elems) ; elems = GetIntegerSize(binr); IQ = binr.ReadBytes(elems) ; Console.WriteLine("showing components .."); if (verbose) { showBytes("\nModulus", MODULUS) ; showBytes("\nExponent", E); showBytes("\nD", D); showBytes("\nP", P); showBytes("\nQ", Q); showBytes("\nDP", DP); showBytes("\nDQ", DQ); showBytes("\nIQ", IQ); } // ------- create RSACryptoServiceProvider instance and initialize with public key ----- RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSAParameters RSAparams = new RSAParameters(); RSAparams.Modulus =MODULUS; RSAparams.Exponent = E; RSAparams.D = D; RSAparams.P = P; RSAparams.Q = Q; RSAparams.DP = DP; RSAparams.DQ = DQ; RSAparams.InverseQ = IQ; RSA.ImportParameters(RSAparams); return RSA; } catch (Exception) { return null; } finally { binr.Close(); } } </code></pre>
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    1. POHow to read a PEM RSA private key from .NET
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    1. USIan Boyd
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    1. COTried, doesn't work, and didn't take the time to go through the code yet, I'd hope there was a simpler solution.
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    2. COCould you give details on what failed? I took a look at the code, and it seems like it should work. Perhaps you could even post the PEM-file? (If you have a non-sensitive one).
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      1. USRasmus Faber
    3. COi just found this answer cross-linked from [this SO question](http://stackoverflow.com/a/1162519/12597). Now that i see that it's actual code files, and they're literally just decoding the ASN.1 encoded data, this answer deserves more +1. (They really shouldn't call themselves `JavaScience`)
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