因爲項目的緣由,原來的項目使用.net 進行開發,如今須要轉成java, 因此原來的加解密就成了一個棘手的問題。因爲數據使用RSA簽名加密,又由於.net 和 Java 加解密算法上的差別,並不能使用同一個私鑰來對原始數據進行解密。因此考慮的方向就是簽名密鑰之間互相轉換。java
有幸的是,網絡上也有不少遇到此問題的朋友,網上也有相似的不少解決方法。可是尋找最終的解決方案仍是花了很長時間。再加上本身對程序上的修改,得出了比較適合本身轉換的一個解決方案吧。算法
轉換須要使用BouncyCastle.Crypto.dll網絡
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Xml; using System.Security.Cryptography; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Asn1.Pkcs; using Org.BouncyCastle.Pkcs; using Org.BouncyCastle.Math; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.X509; using Org.BouncyCastle.Security; namespace RSADemo { public class RSAKeyConvert { /// <summary> /// RSA私鑰格式轉換,java->.net /// </summary> /// <param name="privateKey">java生成的RSA私鑰</param> /// <returns></returns> public static string RSAPrivateKeyJava2DotNet(string privateKey) { RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey)); 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>", Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned())); } /// <summary> /// RSA私鑰格式轉換,.net->java /// </summary> /// <param name="privateKey">.net生成的私鑰</param> /// <returns></returns> public static string RSAPrivateKeyDotNet2Java(string privateKey) { XmlDocument doc = new XmlDocument(); doc.LoadXml(privateKey); BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText)); BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText)); BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText)); BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText)); BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText)); BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText)); RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv); PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam); byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded(); return Convert.ToBase64String(serializedPrivateBytes); } /// <summary> /// RSA公鑰格式轉換,java->.net /// </summary> /// <param name="publicKey">java生成的公鑰</param> /// <returns></returns> public static string RSAPublicKeyJava2DotNet(string publicKey) { RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey)); return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>", Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()), Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned())); } /// <summary> /// RSA公鑰格式轉換,.net->java /// </summary> /// <param name="publicKey">.net生成的公鑰</param> /// <returns></returns> public static string RSAPublicKeyDotNet2Java(string publicKey) { XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey); BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); RsaKeyParameters pub = new RsaKeyParameters(false, m, p); SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub); byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded(); return Convert.ToBase64String(serializedPublicBytes); } } }
寫於2016-07-19加密