ras私钥c#转java_记一次工作需求: RSA密钥之C#格式与Java格式转换

前言

最近由于项目需求，服务端由c#编写，客户端由java编写。通信数据使用RSA非对称加密。但是java和c#生成的密钥格式是不一样的，所以需要转换格式才可以正常使用。网上搜到使用java进行格式转换的代码(如：http://blog.youkuaiyun.com/road2010/article/details/40071881 )，本文将给出一种c#的实现方法。

密钥格式

java密钥格式如下：

私钥：

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公钥：

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCkmUkhHT4b++zuaHJyzRl3kNtaiQwKwtfsiHfvf6WOW15GZObwgePRKXzMDbpC7+gCaqH04WTzTrNbdNeX3RGCFJ5CHNkFcUcGtMU3hT+jfA+FkF0VrOHzRtuySuZD+ObPvSpSbceYbOxve2jHM3oSFqR2juo/Ypzpo5VPJetimQIDAQAB

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.NET密钥格式如下：

私钥：

pJlJIR0+G/vs7mhycs0Zd5DbWokMCsLX7Ih373+ljlteRmTm8IHj0Sl8zA26Qu/oAmqh9OFk806zW3TXl90RghSeQhzZBXFHBrTFN4U/o3wPhZBdFazh80bbskrmQ/jmz70qUm3HmGzsb3toxzN6Ehakdo7qP2Kc6aOVTyXrYpk=

AQAB

1WKkFg6jlS2eZSVLiH1CK4b9uhr7qE1/L+tPqKQs+PzHX4eiZXnyAlQ+kgGmL7n1wR1RWNuiYnDZUetmTogaDQ==

xXhsuEnNJNQcQHEVTPZoulbMbTV1VZIDQ1zjG8fvu8sv6IBYcR5+EsC8n3/6RkW8/iCJDzxE++VHzhoSQSoDvQ==

zr/rcn+umd0Aisnu/Ik48smxz39TdIfaAwkBPsoL1Re+6V2WyLG1/fG4SmmUpsuMRRdt+SWdmbnzpr7peo++hQ==

MWi2W04sBEEGaKFi4QTuo2FAeTrdBvIn2t0M/lCCjYyDijtC5drpVKvhBk+xQZAFf9iIMsWzxQtTciBX3PI0SQ==

wGEfA3LWM4NHgRnXDqwwOUs3OtqWK0tsJPPcFMci+Bcgy96JpFTCr7bubXHMu14bdopCWUann2d3UuwEpvP+

mK3TRtMwRJb33OGnn9OeFumYfy92qxi3X6Hq1o6qDBW2qkd4bImfv+ni6AinyOVuaadt2Y+lq4dKGcCVJzoZvPm1VKxD2y7xKa8/vEbPRiRTt0qnPq9T7UJkpDsiXf/zOMfWdjc3uA1bPnQ65RWHSJ7zAE+Gd7xnyCE5MEyijLE=

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公钥：

pJlJIR0+G/vs7mhycs0Zd5DbWokMCsLX7Ih373+ljlteRmTm8IHj0Sl8zA26Qu/oAmqh9OFk806zW3TXl90RghSeQhzZBXFHBrTFN4U/o3wPhZBdFazh80bbskrmQ/jmz70qUm3HmGzsb3toxzN6Ehakdo7qP2Kc6aOVTyXrYpk=

AQAB

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转换实现代码(c#)

格式转换要用到一个开源加密库Bouncy Castle Crypto APIs，官网地址： http://www.bouncycastle.org/csharp/

具体实现代码如下：

1 usingSystem;2 usingSystem.Xml;3 usingOrg.BouncyCastle.Asn1.Pkcs;4 usingOrg.BouncyCastle.Asn1.X509;5 usingOrg.BouncyCastle.Crypto.Parameters;6 usingOrg.BouncyCastle.Math;7 usingOrg.BouncyCastle.Pkcs;8 usingOrg.BouncyCastle.Security;9 usingOrg.BouncyCastle.X509;10

11 ///

12 ///RSA密钥格式转换13 ///

14 public classRSAKeyConvert15 {16 ///

17 ///RSA私钥格式转换，java->.net18 ///

19 /// java生成的RSA私钥

20 ///

21 public static string RSAPrivateKeyJava2DotNet(stringprivateKey)22 {23 RsaPrivateCrtKeyParameters privateKeyParam =(RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));24

25 return string.Format("{0}{1}

{2}

{3}{4}{5}{6}{7}",26 Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),27 Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),28 Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),29 Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),30 Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),31 Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),32 Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),33 Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));34 }35

36 ///

37 ///RSA私钥格式转换，.net->java38 ///

39 /// .net生成的私钥

40 ///

41 public static string RSAPrivateKeyDotNet2Java(stringprivateKey)42 {43 XmlDocument doc = newXmlDocument();44 doc.LoadXml(privateKey);45 BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));46 BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));47 BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));48 BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));49 BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));50 BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));51 BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));52 BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));53

54 RsaPrivateCrtKeyParameters privateKeyParam = newRsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);55

56 PrivateKeyInfo privateKeyInfo =PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);57 byte[] serializedPrivateBytes =privateKeyInfo.ToAsn1Object().GetEncoded();58 returnConvert.ToBase64String(serializedPrivateBytes);59 }60

61 ///

62 ///RSA公钥格式转换，java->.net63 ///

64 /// java生成的公钥

65 ///

66 public static string RSAPublicKeyJava2DotNet(stringpublicKey)67 {68 RsaKeyParameters publicKeyParam =(RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));69 return string.Format("{0}{1}",70 Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),71 Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));72 }73

74 ///

75 ///RSA公钥格式转换，.net->java76 ///

77 /// .net生成的公钥

78 ///

79 public static string RSAPublicKeyDotNet2Java(stringpublicKey)80 {81 XmlDocument doc = newXmlDocument();82 doc.LoadXml(publicKey);83 BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));84 BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));85 RsaKeyParameters pub = new RsaKeyParameters(false, m, p);86

87 SubjectPublicKeyInfo publicKeyInfo =SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);88 byte[] serializedPublicBytes =publicKeyInfo.ToAsn1Object().GetDerEncoded();89 returnConvert.ToBase64String(serializedPublicBytes);90 }91 }

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原文章地址: http://www.cnblogs.com/datous/p/RSAKeyConvert.html#