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How to use OpenSSL.Net C # wrapper to encrypt a string using AES?

I am trying to send some encrypted data from my SharePoint site to my PeopleSoft website. PeopleSoft people insist that I need to use the OpenSSL library for my encryption. I downloaded and installed the OpenSSL.Net project from SourceForge.

For my purposes, I just need to encrypt the string using AES. I know how to do this with the System.Security.Cryptography library, but it is very difficult for me to switch this to the side of OpenSSL.Net. Very frustrating as I see everything that seems to me in Intellisense!

Does anyone have an example of performing string encryption / decryption using AES using the OpenSSL.Net shell?

Thanks!

-Nick

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1 answer

Here is an example that works for me. I simplified it with copy-paste, but it doesn't matter.

I use a text password because of compatibility with the JS library, but open SSL itself supports the direct use of the [] Key and IV byte, so you can use it.

To switch binary data to a string, just use

Encoding.UTF8.GetBytes() and Encoding.UTF8.GetString()

to convert back and forth.

  public Byte[] Encrypt(Byte[] data, String password) { //Just random 8 bytes for salt var salt = new Byte[] {1, 2, 3, 4, 5, 6, 7, 8}; using (var cc = new CipherContext(Cipher.AES_256_CBC)) { //Constructing key and init vector from string password byte[] passwordBytes = Encoding.UTF8.GetBytes(password); byte[] iv; byte[] key = cc.BytesToKey(MessageDigest.MD5, salt, passwordBytes, 1, out iv); var memoryStream = new MemoryStream(); //Performing encryption thru unmanaged wrapper var aesData = cc.Crypt(data, key, iv, true); //Append salt so final data will look Salted___SALT|RESTOFTHEDATA memoryStream.Write(Encoding.UTF8.GetBytes("Salted__"), 0, 8); memoryStream.Write(salt, 0, 8); memoryStream.Write(aesData, 0, aesData.Length); return memoryStream.ToArray(); } } public Byte[] Decrypt(String password, Byte[] encryptedData) { byte[] salt = null; //extracting salt if presented if (encryptedData.Length > 16) { if (Encoding.UTF8.GetString(encryptedData).StartsWith("Salted__")) { salt = new Byte[8]; Buffer.BlockCopy(encryptedData, 8, salt, 0, 8); } } //Removing salt from the original array int aesDataLength = encryptedData.Length - 16; byte[] aesData = new byte[aesDataLength]; Buffer.BlockCopy(encryptedData, 16, aesData, 0, aesDataLength); using (var cc = new CipherContext(Cipher.AES_256_CBC)) { //Constructing key and init vector from string password and salt byte[] passwordBytes = Encoding.UTF8.GetBytes(password); byte[] iv; byte[] key = cc.BytesToKey(MessageDigest.MD5, salt, passwordBytes, 1, out iv); //Decrypting return cc.Decrypt(aesData, key, iv, 0); } }
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