1 /// <summary>
2 /// RSA加密
3 /// </summary>
4 /// <param name="strPublickey"></param>
5 /// <param name="content"></param>
6 /// <returns></returns>
7 public string RsaEncrypt(string strPublickey, string content)
8 {
9 var rsa = new RSACryptoServiceProvider();
10 var param = new RSAParameters();
11 byte[] bdata = GetBytes("65537");
12 param.Exponent = bdata;
13 param.Modulus = GetBytes(strPublickey);
14 rsa.ImportParameters(param);
15
16 byte[] cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content),false);
17
18 return BitConverter.ToString(cipherbytes).Replace("-", string.Empty);
19 }
20
21 public byte[] GetBytes(String num)
22 {
23 BigInteger n = new BigInteger(num, 10);
24 String s = n.ToString(2);
25 if (s.Length % 8 > 0)
26 {
27 s = new String('0', 8 - s.Length % 8) + s;
28 }
29 byte[] data = new byte[s.Length / 8];
30 String ocetstr;
31 for (int i = 0; i < data.Length; i++)
32 {
33 ocetstr = s.Substring(8 * i, 8);
34 data[i] = Convert.ToByte(ocetstr, 2);
35 }
36 return data;
37 }
调用方式
var result = new BigInteger(pubkey, 16);
String sp = RsaEncrypt(string.Format("{0}", result), message);
BigInteger下载地址
http://www.codeproject.com/Articles/2728/C-BigInteger-Class
