RSA密钥,JAVA与.NET之间转换

最近在做银联的一个接口,用到RSA签名,悲剧来了,.net用的RSA密钥格式和JAVA用的不一样

.net为XML格式

<RSAKeyValue><Modulus>53KnujHcV0962zoLigW8d4AUb+1TS3LiySGrXhF5FgjUQhLzI6PCM/hyHPhUat6MTcgWK3kAVInughtNOHXrBI92I1nAdwlMwBPh+F+0UGhQDR5LMaBg7tQq7ebyhy8/QRCtxEO+F0QQYYv0t15RIup+F+08HdWSnTroTBwcEpU=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>

JAVA需要PEM文件或DER格式

PEM文件

-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCz4PgoQ/2o5cMmFJgcFHLwEl1V
2olZxAEMb7mWfwH36JvORq/maQEE4kYbF2gQN7lQ0C+km0WK6s6ZdzHlhIm/CoK9
YdFCssoTyzj9BDc1RpCtiF1siz/f9vOmGzYKp3bHYHCoEX21XaOuDuVURLuVCWws
HPBpk841ayGwoz4PWQIDAQAB
-----END PUBLIC KEY-----

x50916进制展开

30819f300d06092a864886f70d010101050003818d0030818902818100c166a9a72c74666ed033492d99fa85dffab5230511a3099cd2103a3c89024bcaa8e53b3811fe1588d4827f0621f806c7598fcb4de4624dac420cbbcb84e265589d9fb636a727c7046bcc83ca3bd15980c0ea64246c286b62f55be382b75901f1ee20875018612c69e30e316179460f00cb6f1d965223738c4e58b0da9da4bc4d0203010001

　　

DER16进制展开

30818902818100c166a9a72c74666ed033492d99fa85dffab5230511a3099cd2103a3c89024bcaa8e53b3811fe1588d4827f0621f806c7598fcb4de4624dac420cbbcb84e265589d9fb636a727c7046bcc83ca3bd15980c0ea64246c286b62f55be382b75901f1ee20875018612c69e30e316179460f00cb6f1d965223738c4e58b0da9da4bc4d0203010001

问题来了,它们之间是它喵的啥关系

x509与DER

/**
	 * x509格式公钥转换为Der格式
	 *
	 * @param x509PublicKey x509格式公钥字符串
	 * @return Der格式公钥字符串
	 */
	public static String getRsaPublicKeyDerFromX509(String x509PublicKey) {
		try {
			ASN1InputStream aIn = new ASN1InputStream(hexString2ByteArr(x509PublicKey));
			SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(aIn.readObject());
			RSAPublicKeyStructure struct = RSAPublicKeyStructure.getInstance(info.getPublicKey());
			if (aIn != null)
				aIn.close();
			return byteArr2HexString(struct.getDERObject().getEncoded());
		} catch (IOException e) {
			return null;
		}
	}

x509与PEM

对于公钥,x509=Convert.FromBase64String(PEM中间内容)

私钥就不知道怎么算的

因此JAVA使用格式都是可以用x509进行转换的,剩下的就是如何将.NET的和JAVA的相互转换

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/

x509与.NET相互转换

/// <summary>
        /// RSA私钥格式转换，java->.net
        /// </summary>
        /// <param name="privateKeyInfoData">java生成的RSA私钥</param>
        /// <returns></returns>
        public static string RSAPrivateKeyJava2DotNet(byte[] privateKeyInfoData)
        {
            RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(privateKeyInfoData);

            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私钥格式转换，.net->java
        /// </summary>
        /// <param name="privateKey">.net生成的私钥</param>
        /// <returns></returns>
        public static byte[] RSAPrivateKeyDotNet2Java(string privateKey)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(privateKey);
            BigInteger m = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));
            BigInteger exp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));
            BigInteger d = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[].InnerText));
            BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[].InnerText));
            BigInteger q = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[].InnerText));
            BigInteger dp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[].InnerText));
            BigInteger dq = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[].InnerText));
            BigInteger qinv = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[].InnerText));

            RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);

            PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
            byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
            return serializedPrivateBytes;
            //return Convert.ToBase64String(serializedPrivateBytes);
        }

        /// <summary>
        /// RSA公钥格式转换，java->.net
        /// </summary>
        /// <param name="keyInfoData">java生成的公钥</param>
        /// <returns></returns>
        public static string RSAPublicKeyJava2DotNet(byte[] keyInfoData)
        {
            RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(keyInfoData);
            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
                Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
                Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
        }

        /// <summary>
        /// RSA公钥格式转换，.net->java
        /// </summary>
        /// <param name="publicKey">.net生成的公钥</param>
        /// <returns></returns>
        public static byte[] RSAPublicKeyDotNet2Java(string publicKey)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(publicKey);
            BigInteger m = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));
            BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));
            RsaKeyParameters pub = new RsaKeyParameters(false, m, p);

            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
            return serializedPublicBytes;
            //return Convert.ToBase64String(serializedPublicBytes);
        }

PEM与.NET相互转换

 public static void Xml2PemPrivate(string xml,string saveFile)
        {
            var rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xml);
            var p = rsa.ExportParameters(true);
            var key = new RsaPrivateCrtKeyParameters(
                new BigInteger(, p.Modulus), new BigInteger(, p.Exponent), new BigInteger(, p.D),
                new BigInteger(, p.P), new BigInteger(, p.Q), new BigInteger(, p.DP), new BigInteger(, p.DQ),
                new BigInteger(, p.InverseQ));
            using (var sw = new StreamWriter(saveFile))
            {
                var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(sw);
                pemWriter.WriteObject(key);
            }
        }
        public static string Pem2XmlPrivate(string pemFile)
        {
            AsymmetricCipherKeyPair keyPair;
            using (var sr = new StreamReader(pemFile))
            {
                var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(sr);
                keyPair = (AsymmetricCipherKeyPair)pemReader.ReadObject();
            }
            var key = (RsaPrivateCrtKeyParameters)keyPair.Private;
            var p = new RSAParameters
            {
                Modulus = key.Modulus.ToByteArrayUnsigned(),
                Exponent = key.PublicExponent.ToByteArrayUnsigned(),
                D = key.Exponent.ToByteArrayUnsigned(),
                P = key.P.ToByteArrayUnsigned(),
                Q = key.Q.ToByteArrayUnsigned(),
                DP = key.DP.ToByteArrayUnsigned(),
                DQ = key.DQ.ToByteArrayUnsigned(),
                InverseQ = key.QInv.ToByteArrayUnsigned(),
            };
            var rsa = new RSACryptoServiceProvider();
            rsa.ImportParameters(p);
            return rsa.ToXmlString(true);
        }

        public static string Xml2PemPublic(string xml, string saveFile)
        {
            var rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xml);
            var p = rsa.ExportParameters(false);
            RsaKeyParameters key = new RsaKeyParameters(false, new BigInteger(, p.Modulus), new BigInteger(, p.Exponent));
            using (var sw = new StreamWriter(saveFile))
            {
                var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(sw);
                pemWriter.WriteObject(key);
            }
            return System.IO.File.ReadAllText(saveFile);
        }

        public static string Pem2XmlPublic(string pemFileConent)
        {
            pemFileConent = pemFileConent.Replace("-----BEGIN PUBLIC KEY-----", "").Replace("-----END PUBLIC KEY-----", "").Replace("\n", "").Replace("\r", "");
            var data = Convert.FromBase64String(pemFileConent);
            return RSAPublicKeyJava2DotNet(data);
        }