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(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 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(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 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(1, p.Modulus), new BigInteger(1, p.Exponent), new BigInteger(1, p.D), new BigInteger(1, p.P), new BigInteger(1, p.Q), new BigInteger(1, p.DP), new BigInteger(1, p.DQ), new BigInteger(1, 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(1, p.Modulus), new BigInteger(1, 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(" ", "").Replace(" ", ""); var data = Convert.FromBase64String(pemFileConent); return RSAPublicKeyJava2DotNet(data); }