java,net RSA key Format conversion

Java and net RSA key formats are converted to each other (public key, private key)

Not much to say directly on the code, you need to reference the Open source class library BouncyCastle.Crypto.dll

You can also download the http://downloads.bouncycastle.org/csharp/bccrypto-net-1.7-bin.zip here

The following is the conversion code

1 usingSystem;2 usingSystem.Xml;3 usingOrg.BouncyCastle.Asn1.Pkcs;4 usingOrg.BouncyCastle.Asn1.X509;5 usingOrg.BouncyCastle.Crypto.Parameters;6 usingOrg.BouncyCastle.Math;7 usingOrg.BouncyCastle.Pkcs;8 usingOrg.BouncyCastle.Security;9 usingOrg.BouncyCastle.X509;Ten /// <summary> One ///RSA key format conversion A /// </summary> -  Public classRsakeyconvert - { the     /// <summary>     -     ///RSA private key format conversion, Java->.net -     /// </summary>     -     /// <param name= "Privatekey" >Java-generated RSA private key</param>     +     /// <returns></returns>    -      Public Static stringRsaprivatekeyjava2dotnet (stringPrivatekey) +     { ARsaprivatecrtkeyparameters Privatekeyparam =(rsaprivatecrtkeyparameters) Privatekeyfactory.createkey (convert.frombase64string (PrivateKey)); at         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 ()), in convert.tobase64string (privateKeyParam.DQ.ToByteArrayUnsigned ()), - convert.tobase64string (privateKeyParam.QInv.ToByteArrayUnsigned ()), to convert.tobase64string (privateKeyParam.Exponent.ToByteArrayUnsigned ())); +     } -     /// <summary>     the     ///RSA private key format conversion,. Net->java *     /// </summary>     $     /// <param name= "Privatekey" >. NET-generated private keys</param>    Panax Notoginseng     /// <returns></returns>    -      Public Static stringRsaprivatekeydotnet2java (stringPrivatekey) the     { +XmlDocument doc =NewXmlDocument (); A Doc. LOADXML (Privatekey); theBigInteger m =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("modulus")[0]. InnerText)); +BigInteger exp =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("Exponent")[0]. InnerText)); -BigInteger d =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("D")[0]. InnerText)); $BigInteger p =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("P")[0]. InnerText)); $BigInteger q =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("Q")[0]. InnerText)); -BigInteger DP =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("DP")[0]. InnerText)); -BigInteger dq =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("DQ")[0]. InnerText)); theBigInteger QINV =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("Inverseq")[0]. InnerText)); -Rsaprivatecrtkeyparameters Privatekeyparam =Newrsaprivatecrtkeyparameters (M, exp, D, p, Q, DP, DQ, QINV);WuyiPrivatekeyinfo Privatekeyinfo =Privatekeyinfofactory.createprivatekeyinfo (privatekeyparam); the         byte[] Serializedprivatebytes =Privatekeyinfo.toasn1object (). Getencoded (); -         returnconvert.tobase64string (serializedprivatebytes); Wu     } -     /// <summary>     About     ///RSA public key format conversion, Java->.net $     /// </summary>     -     /// <param name= "PublicKey" >Java-generated public key</param>     -     /// <returns></returns>     -      Public Static stringRsapublickeyjava2dotnet (stringPublicKey) A     { +Rsakeyparameters Publickeyparam =(rsakeyparameters) Publickeyfactory.createkey (convert.frombase64string (PublicKey)); the         return string. Format ("<rsakeyvalue><modulus>{0}</modulus><exponent>{1}</exponent></rsakeyvalue >", - convert.tobase64string (publicKeyParam.Modulus.ToByteArrayUnsigned ()), $ convert.tobase64string (publicKeyParam.Exponent.ToByteArrayUnsigned ())); the     } the     /// <summary>     the     ///RSA public key format conversion,. Net->java the     /// </summary>     -     /// <param name= "PublicKey" >. NET-generated public key</param>     in     /// <returns></returns>    the      Public Static stringRsapublickeydotnet2java (stringPublicKey) the     { AboutXmlDocument doc =NewXmlDocument (); Doc. LOADXML (PublicKey); theBigInteger m =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("modulus")[0]. InnerText)); theBigInteger p =NewBigInteger (1, Convert.frombase64string (Doc. Documentelement.getelementsbytagname ("Exponent")[0]. InnerText)); theRsakeyparameters pub =NewRsakeyparameters (false, M, p); +Subjectpublickeyinfo Publickeyinfo =Subjectpublickeyinfofactory.createsubjectpublickeyinfo (pub); -         byte[] Serializedpublicbytes =Publickeyinfo.toasn1object (). Getderencoded (); the         returnconvert.tobase64string (serializedpublicbytes);Bayi     } the}

java,net RSA key Format conversion