Aqui está en C# 

Código [Seleccionar]
using System.Security.Cryptography;
public string fntEncriptar(string strCadena){
MD5 md5Hasher = MD5.Create();
Byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(strCadena));
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
return sBuilder.ToString();
}