JAVA和NET RSA密钥格式相互转换（公钥，私钥）
做了一个小项目遇到java和.net非对称加密问题，java的公钥和私钥就直接是一个字符串的形式展示的，但是.net是以xml简单包裹形式展示的，这样就会出现秘钥不一致的情况，导致java和.net加密与解密出现障碍，
首先，我们来看一下java端的私钥和公钥的样子：
私钥：
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
公钥：
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC+lSTeGZH2QN2jz4Cgt8Wqk/8mU+RTpUOUxoOoXlag1RBx1Sx9RPhxBJlprk79p4M/aWW88vSlpCaVefVtXYDR0kpOe+VY1AL9AYWVxUh9JZ4NpmdkOf9nVcSrAEoydm0IhBlA/CzuSqWi5X0KaNwDaLwWb1LR8OXsXoJ8l8mWwwIDAQAB
我们再来看一下.net端的私钥和公钥的样子：
私钥：
<RSAKeyValue><Modulus>vpUk3hmR9kDdo8+AoLfFqpP/JlPkU6VDlMaDqF5WoNUQcdUsfUT4cQSZaa5O/aeDP2llvPL0paQmlXn1bV2A0dJKTnvlWNQC/QGFlcVIfSWeDaZnZDn/Z1XEqwBKMnZtCIQZQPws7kqlouV9CmjcA2i8Fm9S0fDl7F6CfJfJlsM=</Modulus><Exponent>AQAB</Exponent><P>+94gtho2crq+GpiUDyunfpA5SdHWMslL0GtL3epn6D50AziKmsgWrnksFiKSyPy+3lLj/Qgxa8kLXQb1qg/3QQ==</P><Q>wbWcrybn0eaxiPZacZLZXzXO8g12hYoXT1h0DTLvy1rnVUOspNfKZcBZMjPxT4+QEknoTShSnSbJ5sHitfZxAw==</Q><DP>0yVTbPYqoSHWTvuMW+9v2hVUQYNtO2Qvb4kTr/VbqIH6xdx3reyBv0CL6f6P6XihFkaNJMnijIadRR6ZgjkiQQ==</DP><DQ>gPSTa3L+DxmCBQjj6wn01dJvg2p9BaeJnxPmpkbLplhM+tFDpLXXkud7OdWkhu+u3M4A7SSz4tTIwms+rx5x2w==</DQ><InverseQ>4NxLLg6UCAoCpXMgqqZHWMgbMwNNFr9diCWP/tZ5OJmWYHgn7zfqMXa/RNaethjdG1biIkj5h7qm6XDBBqGuxw==</InverseQ><D>r7YEWr1KhLcDYg9jMUqd9QokOSspnTEGoPlx016/EeO/GKSJMynOwSyTYQszisvRxzoecdmyU7GHXVMnQ2Ds7WvbcuNkIRWmxFa4nTkk2zNF6KByvvFwLiW4LQXF6B+uV7+ZNqvfhCoD/j2wki8jfWkuuAaKnTda/axHMi+zRYE=</D></RSAKeyValue>
公钥：
<RSAKeyValue><Modulus>vpUk3hmR9kDdo8+AoLfFqpP/JlPkU6VDlMaDqF5WoNUQcdUsfUT4cQSZaa5O/aeDP2llvPL0paQmlXn1bV2A0dJKTnvlWNQC/QGFlcVIfSWeDaZnZDn/Z1XEqwBKMnZtCIQZQPws7kqlouV9CmjcA2i8Fm9S0fDl7F6CfJfJlsM=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>
一下给出java和.net互相转化代码
不多说直接上代码，需要引用开源类库BouncyCastle.Crypto.dll
也可以在这里下载http://downloads.bouncycastle.org/csharp/bccrypto-net-1.7-bin.zip
以下为转化代码
1 using System; 2 using System.Xml; 3 using Org.BouncyCastle.Asn1.Pkcs; 4 using Org.BouncyCastle.Asn1.X509; 5 using Org.BouncyCastle.Crypto.Parameters; 6 using Org.BouncyCastle.Math; 7 using Org.BouncyCastle.Pkcs; 8 using Org.BouncyCastle.Security; 9 using Org.BouncyCastle.X509; 10 /// <summary> 11 /// RSA密钥格式转换 12 /// </summary> 13 public class RSAKeyConvert 14 { 15 /// <summary> 16 /// RSA私钥格式转换，java->.net 17 /// </summary> 18 /// <param name="privateKey">java生成的RSA私钥</param> 19 /// <returns></returns> 20 public static string RSAPrivateKeyJava2DotNet(string privateKey) 21 { 22 RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey)); 23 return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>", 24 Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()), 25 Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()), 26 Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()), 27 Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()), 28 Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()), 29 Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()), 30 Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()), 31 Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned())); 32 } 33 /// <summary> 34 /// RSA私钥格式转换，.net->java 35 /// </summary> 36 /// <param name="privateKey">.net生成的私钥</param> 37 /// <returns></returns> 38 public static string RSAPrivateKeyDotNet2Java(string privateKey) 39 { 40 XmlDocument doc = new XmlDocument(); 41 doc.LoadXml(privateKey); 42 BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); 43 BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); 44 BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText)); 45 BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText)); 46 BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText)); 47 BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText)); 48 BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText)); 49 BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText)); 50 RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv); 51 PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam); 52 byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded(); 53 return Convert.ToBase64String(serializedPrivateBytes); 54 } 55 /// <summary> 56 /// RSA公钥格式转换，java->.net 57 /// </summary> 58 /// <param name="publicKey">java生成的公钥</param> 59 /// <returns></returns> 60 public static string RSAPublicKeyJava2DotNet(string publicKey) 61 { 62 RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey)); 63 return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>", 64 Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()), 65 Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned())); 66 } 67 /// <summary> 68 /// RSA公钥格式转换，.net->java 69 /// </summary> 70 /// <param name="publicKey">.net生成的公钥</param> 71 /// <returns></returns> 72 public static string RSAPublicKeyDotNet2Java(string publicKey) 73 { 74 XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey); 75 BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); 76 BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); 77 RsaKeyParameters pub = new RsaKeyParameters(false, m, p); 78 SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub); 79 byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded(); 80 return Convert.ToBase64String(serializedPublicBytes); 81 } 82 }
