JAVA，NET RSA密钥格式转换

JAVA和NET RSA密钥格式相互转换（公钥，私钥）

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 }