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    <p>I found this and thought it was the answer to my prayers. However using openssl (1.0.0e Mac os x) to generate pub/priv keys, i cannot get the clear text back again from the encrypted text - is there a GetBytes/Baseencode type step I'm missing? did you come across this?</p> <p><strong>EDIT: no sooner had i posted i then came across a different example using UTF8 encoding not ASCII, which works!</strong></p> <p>Ben</p> <pre><code>namespace testopenssl2 { class Program { public static byte[] AsymmetricEncrypt(string publicKeyAsPem, byte[] payload) { CryptoKey d = CryptoKey.FromPublicKey(publicKeyAsPem, null); RSA rsa = d.GetRSA(); byte[] result = rsa.PublicEncrypt(payload, RSA.Padding.PKCS1); rsa.Dispose(); return result; } public static byte[] AsymmetricDecrypt(string privateKeyAsPem, byte[] payload) { //CryptoKey d = CryptoKey.FromPrivateKey(privateKeyAsPem, null); CryptoKey d = CryptoKey.FromPrivateKey(privateKeyAsPem, "pass"); RSA rsa = d.GetRSA(); byte[] result = rsa.PrivateDecrypt(payload, RSA.Padding.PKCS1); rsa.Dispose(); return result; } static void Main(string[] args) { String t = @"-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbhcU+fhYmYLESZQAj1hKBXsNY si0kYHNkxpP7ftxZiTFowWUVXHzQgkcYiCNnp3pt1eG6Vt0WDzyFYXqUUqugvX41 gkaIrKQw/sRiWEx49krcz7Vxr3dufL6Mg3eK7NyWDGsqwFrx/qVNqdhsHg12PGNx IMY4UBtxin2A8pd4OwIDAQAB -----END PUBLIC KEY-----"; String p = @"-----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: DES-EDE3-CBC,0A128C2617BD2EB1 pTDtXB+mockO7fvVqn4fwGnSb1Zv3HaMAALtpiB7Rn64eAHL7psKQIIM3qoshDWF XgXDdTnMOGO7wtYkd9R7iJYxgt19EuEdtu2SLLXQuN4ll+JSR2R/34dF19iMXI30 d3pe7obTIwKdyRGuu8GgEm6bGai4pkqptP0HRA6qdMI2+Qfl9+VqUuvIm7tfpIRd /ZLENe756IrGDvI7lGx39Md/H2sgAJsWkSYubhmtxVJ0IEvbPuKDC5V5oLyTOoy+ 6sc6ly57C4XHaTLhAKnYEvZAddnXg/e/VtfmTpqKx3n7D6FAKo1RjAjeZqEvefZd XAhh19YhZq3mdZNYUt7ojUarf/q3zrtTMLUxHdR0Be/VaQC5AE0d6quKyUQgxiti XNRS8xk9IJJqJLFSHO3ET+oTfcs+kLPuUDHqq0hY/OgW/THcDgPY1cDwtOX9yuI3 YDoFTb3SXzRTmk2ui33f96wNPwzIAp9+TJzITxJYbF233Pz4YWuabrFuoNWZnwtT E/o6wcGfvAXTQkAKzwfLbTDmg5SSiGokoEcgm7qpfmQxKdmV1LmbW88DuAgdWggm Qf3ydZ2IrrtD1o+XP7JraeVOql0OK77pJh/bcr3bLiAT8YtsQUZLnOjkbDc3F1zW BGr6eeqUHxY6cqKieokhl9cBBjWuxJQL2h997svBufWdNOjTA4+32lXzDzi7bUxC xzIqZ7nm3YC2zUjla/l3Smz5KitqU5Y3Q9URpXOW+qMiPxmTHYOEcRDy9yh2U4iA CoTD6q0ZNJLEo3EVcDB+26O663/mQLuR69xstUgqHpSzGvXbqrmezA== -----END RSA PRIVATE KEY-----"; System.Text.Encoding enc = System.Text.Encoding.ASCII; String s = "hello"; byte[] payload = enc.GetBytes(s); Console.WriteLine("s: {0}", s); byte[] byte_encData = AsymmetricEncrypt(t,payload); String res; res = Convert.ToBase64String(byte_encData); Console.WriteLine("encypted: {0}", res); byte[] byte_decrypted = AsymmetricDecrypt(p, byte_encData); String res_unenc; res_unenc = Convert.ToBase64String(byte_decrypted); // works! Console.WriteLine("decrypted: {0}", res_unenc); } } } </code></pre>
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    1. PODecrypting RSA using OpenSSL.NET with Existing Key
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