标签：rsa   dem-xml   

1、第一步先用openssl将pem的key转换为der的key //E:\01Doc\bin>openssl.exe rsa -in rsakeydec.pem -outform der -out pri.der
2、调用下面的程序直接读取der转换为c#所需要的xml Key，之后进行密文解密
3、openssl下载地址

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Security.Cryptography; using System.ComponentModel; using System.Runtime.InteropServices; /*refer: */ namespace ConsoleApplication1 { class Program { 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; } //E:\01Doc\010技术文档\openssl-1.0.2a\OpenSSL_SrcandLib\win32lib\bin>openssl.exe r //sa -in rsakeydec.txt -outform der -out pri.der //writing RSA key public static RSACryptoServiceProvider DecodeRSAPrivateKey(string priKey) { //var privkey = Convert.FromBase64String(priKey); 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); string path = @"D:\\project\\ConsoleApplication1\\li_pri.der"; FileStream fs = new FileStream(path, FileMode.Open,FileAccess.Read); BinaryReader binr = new BinaryReader(fs); //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) { Console.WriteLine(e.Message + e.StackTrace); return null; } finally { binr.Close(); } } /************************************************************************/ /* 你的是pem key，，需要下转换为c# rsa provider认识的key。 首先，干掉头部和尾部的无用字符，然后利用如下方法转换：*/ /************************************************************************/ public static void PrivateKeyDecFun() { string priKey = @"-----BEGIN RSA PRIVATE KEY----- MIICWwIBAAKBgQCf1a4LQyipBqeUCZ9kKsfasQzkEFCBmGsM21Sakb5BO0sY07GD cproJHF2xNQrV0cM7+liE3pBUFsarui2WaHZhAibpLbl9z4FSfoN5hSg6sEgbB17 SvKe3ZN/75GoEsQiQtYW4gUJgzrBovVZ+TeTnN+NHHBqUqBKhNIgPFVapQIDAQAB AoGAG0OMs5kaF3LuJN9bU+/ENXab908dHG4OXJwRG2ie5muhzLNXhU+IQu7sd9Dt TBNQKFHIIpWl9fwp/iw1v90cMUQGj0zhSXHAz7Vak/ryQLTyeIIciL8MQWvnbAaN lIoFq2wBl7SYs3n71B4MlvvTysaG0krsjiPh5LVgnBvzjGECQQDcAwe4XnF7SHWO nfljrG29soKNiUhYKtDGcV9fvam9u50Ek882wvFmsJP+tk+1CXjMRSNlOi40bxKC uaBa1JOtAkEAufq9FmZHfBFf3e6n57wLiAj5C1MeyHAtt6qdAF49OZJBGZh1pePn jDGNezFvy7U5bMp7/updisLCFueS5eKB2QJAF84QIMe/OZqedZ7sI/e9LABLlerb tAZ17nLH4gEQg6HwHFWt3vv6yKSkbrPlLe5nbpqweLxx0WSPOSvCiPFlRQJAPAfF NQ+6jz+EdDxukgxOpJBQ4ujnjMc42ooFt3KzzHt66+ocP3m66bOs+VDRxy0t5gHN 2FCJ9Ro8T+xbrDxasQJAARHpcG6tE0F+lmUthtep1U8OrF+AQvqDhBq8MYK+/pF/ LRZkFHkqTsj89OyWDlSH3LeYkOWsr9mAFxsvHZ9BSA== -----END RSA PRIVATE KEY-----"; priKey = priKey.Replace("-----BEGIN RSA PRIVATE KEY-----", "") .Replace("-----END RSA PRIVATE KEY-----", ""); RSACryptoServiceProvider rsaProvider = DecodeRSAPrivateKey(priKey); //RSACryptoServiceProvider rsaProvider = DecodeRSAPrivateKey(); //rsaProvider.FromXmlString(); String PrivateKey = rsaProvider.ToXmlString(true);//将RSA算法的私钥导出到字符串PrivateKey中，参数为true表示导出私钥 Console.WriteLine(PrivateKey); /************************************************************************/ /* 程序运行结果如下： * <RSAKeyValue><Modulus>n9WuC0MoqQanlAmfZCrH2rEM5BBQgZhrDNtUmpG+QTtLGNOxg3Ka6CRxds TUK1dHDO/pYhN6QVBbGq7otlmh2YQIm6S25fc+BUn6DeYUoOrBIGwde0rynt2Tf++RqBLEIkLWFuIFCY M6waL1Wfk3k5zfjRxwalKgSoTSIDxVWqU=</Modulus><Exponent>AQAB</Exponent><P>3AMHuF5x e0h1jp35Y6xtvbKCjYlIWCrQxnFfX72pvbudBJPPNsLxZrCT/rZPtQl4zEUjZTouNG8SgrmgWtSTrQ== </P><Q>ufq9FmZHfBFf3e6n57wLiAj5C1MeyHAtt6qdAF49OZJBGZh1pePnjDGNezFvy7U5bMp7/updi sLCFueS5eKB2Q==</Q><DP>F84QIMe/OZqedZ7sI/e9LABLlerbtAZ17nLH4gEQg6HwHFWt3vv6yKSkb rPlLe5nbpqweLxx0WSPOSvCiPFlRQ==</DP><DQ>PAfFNQ+6jz+EdDxukgxOpJBQ4ujnjMc42ooFt3Kz zHt66+ocP3m66bOs+VDRxy0t5gHN2FCJ9Ro8T+xbrDxasQ==</DQ><InverseQ>ARHpcG6tE0F+lmUth tep1U8OrF+AQvqDhBq8MYK+/pF/LRZkFHkqTsj89OyWDlSH3LeYkOWsr9mAFxsvHZ9BSA==</Inverse Q><D>G0OMs5kaF3LuJN9bU+/ENXab908dHG4OXJwRG2ie5muhzLNXhU+IQu7sd9DtTBNQKFHIIpWl9fw p/iw1v90cMUQGj0zhSXHAz7Vak/ryQLTyeIIciL8MQWvnbAaNlIoFq2wBl7SYs3n71B4MlvvTysaG0kr sjiPh5LVgnBvzjGE=</D></RSAKeyValue> 请按任意键继续. . .*/ /************************************************************************/ } public static void PrivateKeyDecFun1() { RSACryptoServiceProvider rsaProvider = DecodeRSAPrivateKey(null); String PrivateKey = rsaProvider.ToXmlString(true);//将RSA算法的私钥导出到字符串PrivateKey中，参数为true表示导出私钥 Console.WriteLine(PrivateKey); } static void Main(string[] args) { PrivateKeyDecFun(); PrivateKeyDecFun1(); return; } } }