本人被要求实现.net的签名验签，还是个.net菜鸡，来分享下采坑过程
依然，签名验签使用的证书格式依然是pem，有关使用openssl将.p12和der转pem的命令请转到php实现签名验签
.net不像php只要将pem文件读出来就可以签名验签，需要解析pem文件的主体内容，获取参数装载特定类，具体看一下代码：
//有些函数我也不知道是干嘛的，反正.net的实现要这样，采百家之长，签的了名，验的了签就对了
//自己去单元测试下
//pem文件是我使用的是绝对路径
public class Signature { //签名,返回256位字节数组 public static byte[] Sign(string content,string path,string code) { RSACryptoServiceProvider rsaCsp = RSAProviderPrivate(path); byte[] dataBytes = Encoding.UTF8.GetBytes(content); byte[] signatureBytes = rsaCsp.SignData(dataBytes, code); return signatureBytes; } //验签 public static Boolean Verify(string content, byte[] signContent, string path, string code) { byte[] dataBytes = Encoding.UTF8.GetBytes(content); byte[] publicPemBytes = LoadCertificateFile(path, "PUBLIC KEY"); RSACryptoServiceProvider rsaPub = CreateRsaProviderFromPublicKey(publicPemBytes); Boolean flag= rsaPub.VerifyData(dataBytes,code, signContent); return flag; } //加载公私钥证书文件 private static byte[] LoadCertificateFile(String filePath,string type) { using (System.IO.FileStream fs = System.IO.File.OpenRead(filePath)) { byte[] data = new byte[fs.Length]; byte[] res = null; fs.Read(data, 0, data.Length); if (data[0] != 0x30) { res = GetPem(type, data); } return res; } } private static RSACryptoServiceProvider RSAProviderPrivate(String filePath) { byte[] res = LoadCertificateFile(filePath, "RSA PRIVATE KEY"); try { RSACryptoServiceProvider rsa = DecodeRSAPrivateKey(res); return rsa; } catch (Exception e) { Console.WriteLine(e); } return null; } //获取pem文件的主体内容，并转换成字节数组 private static byte[] GetPem(String type, byte[] data) { string pem = Encoding.UTF8.GetString(data); string header = String.Format("-----BEGIN {0}-----\\n", type); string footer = String.Format("-----END {0}-----", type); int start = pem.IndexOf(header) + header.Length; int end = pem.IndexOf(footer, start); string base64 = pem.Substring(start, (end - start)); return Convert.FromBase64String(base64); } 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 ----- CspParameters CspParameters = new CspParameters(); CspParameters.Flags = CspProviderFlags.UseMachineKeyStore; RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024, CspParameters); 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) { Console.WriteLine(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; } private static RSAParameters ConvertFromPublicKey(byte[] publicPemBytes) { byte[] keyData = publicPemBytes; if (keyData.Length < 162) { throw new ArgumentException("pem file content is incorrect."); } byte[] pemModulus = new byte[128]; byte[] pemPublicExponent = new byte[3]; Array.Copy(keyData, 29, pemModulus, 0, 128); Array.Copy(keyData, 159, pemPublicExponent, 0, 3); RSAParameters para = new RSAParameters(); para.Modulus = pemModulus; para.Exponent = pemPublicExponent; return para; } public static RSACryptoServiceProvider CreateRsaProviderFromPublicKey(byte[] publicKeyBytes) { byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 }; byte[] x509key; byte[] seq = new byte[15]; int x509size; x509key = publicKeyBytes; x509size = x509key.Length; using (MemoryStream mem = new MemoryStream(x509key)) { using (BinaryReader binr = new BinaryReader(mem)) { byte bt = 0; ushort twobytes = 0; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) binr.ReadByte(); else if (twobytes == 0x8230) binr.ReadInt16(); else return null; seq = binr.ReadBytes(15); if (!CompareBytearrays(seq, SeqOID)) return null; twobytes = binr.ReadUInt16(); if (twobytes == 0x8103) binr.ReadByte(); else if (twobytes == 0x8203) binr.ReadInt16(); else return null; bt = binr.ReadByte(); if (bt != 0x00) return null; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) binr.ReadByte(); else if (twobytes == 0x8230) binr.ReadInt16(); else return null; twobytes = binr.ReadUInt16(); byte lowbyte = 0x00; byte highbyte = 0x00; if (twobytes == 0x8102) lowbyte = binr.ReadByte(); else if (twobytes == 0x8202) { highbyte = binr.ReadByte(); lowbyte = binr.ReadByte(); } else return null; byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; int modsize = BitConverter.ToInt32(modint, 0); int firstbyte = binr.PeekChar(); if (firstbyte == 0x00) { binr.ReadByte(); modsize -= 1; } byte[] modulus = binr.ReadBytes(modsize); if (binr.ReadByte() != 0x02) return null; int expbytes = (int)binr.ReadByte(); byte[] exponent = binr.ReadBytes(expbytes); RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSAParameters RSAKeyInfo = new RSAParameters(); RSAKeyInfo.Modulus = modulus; RSAKeyInfo.Exponent = exponent; RSA.ImportParameters(RSAKeyInfo); return RSA; } } } }