class Sign_verifySign { #region prepare string to sign. //example format: a=123&b=xxx&c (with sort) private static string encrypt<T>(T body) { var mType = body.GetType(); var props = mType.GetProperties().OrderBy(x => x.Name).ToArray(); StringBuilder sb = new StringBuilder(); foreach (var p in props) { if (p.Name != "sign" && p.Name != "signType" && p.GetValue(body, null) != null && p.GetValue(body, null).ToString() != "") { sb.Append(string.Format("{0}={1}&", p.Name, p.GetValue(body, null))); } } var tmp = sb.ToString(); return tmp.Substring(0, tmp.Length - 1); } #endregion #region sign public static string sign(string content, string privateKey, string input_charset) { byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content); RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey); SHA1 sh = new SHA1CryptoServiceProvider(); byte[] signData = rsa.SignData(Data, sh); //get base64string -> ASCII byte[] var base64ToByte = Encoding.ASCII.GetBytes(Convert.ToBase64String(signData)); string signresult = BitConverter.ToString(base64ToByte).Replace("-", string.Empty); return signresult; } private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr) { byte[] pkcs8privatekey; pkcs8privatekey = Convert.FromBase64String(pemstr); if (pkcs8privatekey != null) { RSACryptoServiceProvider rsa = DecodePrivateKeyInfo(pkcs8privatekey); return rsa; } else return null; } private static RSACryptoServiceProvider DecodePrivateKeyInfo(byte[] pkcs8) { byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 }; byte[] seq = new byte[15]; MemoryStream mem = new MemoryStream(pkcs8); int lenstream = (int)mem.Length; BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading byte bt = 0; ushort twobytes = 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; bt = binr.ReadByte(); if (bt != 0x02) return null; twobytes = binr.ReadUInt16(); if (twobytes != 0x0001) return null; seq = binr.ReadBytes(15); //read the Sequence OID if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct return null; bt = binr.ReadByte(); if (bt != 0x04) //expect an Octet string return null; bt = binr.ReadByte(); //read next byte, or next 2 bytes is 0x81 or 0x82; otherwise bt is the byte count if (bt == 0x81) binr.ReadByte(); else if (bt == 0x82) binr.ReadUInt16(); //------ at this stage, the remaining sequence should be the RSA private key byte[] rsaprivkey = binr.ReadBytes((int)(lenstream - mem.Position)); RSACryptoServiceProvider rsacsp = DecodeRSAPrivateKey(rsaprivkey); return rsacsp; } catch (Exception) {return null; } finally { binr.Close(); } } private static bool CompareBytearrays(byte[] a, byte[] b) { if (a.Length != b.Length) return false; int i = 0; foreach (byte c in a) { if (c != b[i]) return false; i++; } return true; } private 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); // ------- 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 e) { return null; } finally { binr.Close(); } } private static int GetIntegerSize(BinaryReader binr) { byte bt = 0; byte lowbyte = 0x00; byte highbyte = 0x00; int count = 0; bt = binr.ReadByte(); if (bt != 0x02) //expect integer return 0; bt = binr.ReadByte(); if (bt == 0x81) count = binr.ReadByte(); // data size in next byte else if (bt == 0x82) { highbyte = binr.ReadByte(); // data size in next 2 bytes lowbyte = binr.ReadByte(); byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; count = BitConverter.ToInt32(modint, 0); } else { count = bt; // we already have the data size }while (binr.ReadByte() == 0x00) { //remove high order zeros in data count -= 1; } binr.BaseStream.Seek(-1, SeekOrigin.Current); //last ReadByte wasn`t a removed zero, so back up a byte return count; } #endregion #region verifySign //onepay verify public static bool verifyFromHexAscii(string sign, string publicKey, string content, string charset) { string decSign = System.Text.Encoding.UTF8.GetString(fromHexAscii(sign)); return verify(content, decSign, publicKey, charset); } public static byte[] fromHexAscii(string s) { try { int len = s.Length; if ((len % 2) != 0) throw new Exception("Hex ascii must be exactly two digits per byte."); int out_len = len / 2; byte[] out1 = new byte[out_len]; int i = 0; StringReader sr = new StringReader(s); while (i < out_len) { int val = (16 * fromHexDigit(sr.Read())) + fromHexDigit(sr.Read()); out1[i++] = (byte)val; } return out1; } catch (IOException e) { throw new Exception("IOException reading from StringReader?!?!"); } } private static int fromHexDigit(int c) { if (c >= 0x30 && c < 0x3A) return c - 0x30; else if (c >= 0x41 && c < 0x47) return c - 0x37; else if (c >= 0x61 && c < 0x67) return c - 0x57; else throw new Exception(``` + c + "` is not a valid hexadecimal digit."); } public static bool verify(string content, string signedString, string publicKey, string input_charset) { signedString = signedString.Replace("*", "+"); signedString = signedString.Replace("-", "/"); return JiJianverify(content, signedString, publicKey, input_charset); } public static bool JiJianverify(string content, string signedString, string publicKey, string input_charset) { bool result = false; byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content); byte[] data = Convert.FromBase64String(signedString); RSAParameters paraPub = ConvertFromPublicKey(publicKey); RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider(); rsaPub.ImportParameters(paraPub); SHA1 sh = new SHA1CryptoServiceProvider(); result = rsaPub.VerifyData(Data, sh, data); return result; } private static RSAParameters ConvertFromPublicKey(string pemFileConent) { byte[] keyData = Convert.FromBase64String(pemFileConent); if (keyData.Length < 162) { throw new ArgumentException("pem file content is incorrect."); } RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(keyData); RSAParameters para = new RSAParameters(); para.Modulus = publicKeyParam.Modulus.ToByteArrayUnsigned(); para.Exponent = publicKeyParam.Exponent.ToByteArrayUnsigned(); return para; } #endregion }