RSA key C # format and Java Format conversion

Objective

Recently, due to project requirements, the service driven by C #, and the client was written by Java. The communication data uses RSA asymmetric encryption. However, the key format generated by Java and C # is not the same, so you need to convert the format to work properly. Search the Web to use Java Format Conversion code (such as: http://blog.csdn.net/road2010/article/details/40071881), this article will give a C # implementation method.

The key format Java key format is as follows:

Private:

miicdwibadanbgkqhkig9w0baqefaascamewggjdageaaogbakszssedphv77o5ocnlngxeq21qjdarc1+yid+9/ py5bxkzk5vcb49epfmwnuklv6ajqofthzpnos1t015fdeyiunkic2qvxrwa0xtefp6n8d4wqxrws4fng27jk5kp45s+ 9kljtx5hs7g97amczehiwphao6j9inomjlu8l62kzagmbaaecgyeamk3trtmwrjb33ognn9oefumyfy92qxi3x6hq1o6qdbw2qkd4bimfv+ Ni6ainyovuaadt2y+lq4dkgccvjzozvpm1vkxd2y7xka8/vebprirtt0qnpq9t7ujkpdsixf/zomfwdjc3ua1bpnq65rwhsj7zae+ gd7xnyce5meyijlecqqdvyqqwdqovlz5ljuuifuirhv26gvuotx8v60+opcz4/ mdfh6jleficvd6saayvufxbhvfy26jicnlr62zoibonakeaxxhsuennjnqcqhevtpzoulbmbtv1vzidq1zjg8fvu8sv6ibycr5+esc8n3/ 6rkw8/icjdzxe++vhzhosqsodvqjbam6/63j/rpndairj7vyjopljsc9/u3sh2gmjat7kc9uxvuldlsixtf3xuepplkbljeuxbfklnzm586a+ 6xqpvoucqdfotltolarbbmihyuee7qnhqhk63qbyj9rddp5qgo2mg4o7quxa6vsr4qzpsugqbx/ yidlfs8ulu3igv9zynekcqadayr8dctyzg0ebgdcorda5szc62pyrs2wk89wuxyl4fydl3omkvmkvtu5tccy7xht2ikjzrqefz3ds7asm8/4=

Public:

migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqckmukhht4b++zuahjyzrl3kntaiqwkwtfsihfvf6wow15gzobwgeprkxzmdbpc7+ gcaqh04wtztrnbdnex3rgcfj5chnkfcucgtmu3ht+jfa+fkf0vrohzrtuysuzd+obpvspsbceyboxve2jhm3osfqr2juo/ Ypzpo5vpjetimqidaqab

. NET key format is as follows:

Private:

<RSAKeyValue> <modulus>pjljir0+g/vs7mhycs0zd5dbwokmcslx7ih373+ljltermtm8ihj0sl8za26qu/ oamqh9ofk806zw3txl90rghseqhzzbxfhbrtfn4u/o3wphzbdfazh80bbskrmq/jmz70qum3hmgzsb3toxzn6ehakdo7qp2kc6aovtyxrypk= </Modulus> <Exponent>AQAB</Exponent> <p>1wkkfg6jls2ezsvlih1ck4b9uhr7qe1/l+tpqkqs+ Pzhx4eizxnyalq+kggml7n1wr1rwnuiyndzuetmtogadq==</p> <Q> Xxhsuennjnqcqhevtpzoulbmbtv1vzidq1zjg8fvu8sv6ibycr5+esc8n3/6rkw8/icjdzxe++vhzhosqsodvq==</q> &LT;DP&GT;ZR /rcn+umd0aisnu/ik48smxz39tdifaawkbpsol1re+6v2wylg1/fg4smmupsumrrdt+swdmbnzpr7peo++hq==</dp> <DQ> Mwi2w04sbeegakfi4qtuo2faetrdbvin2t0m/lccjyydijtc5drpvkvhbk+xqzaff9iimswzxqttcibx3pi0sq==</dq> < Inverseq>wgefa3lwm4nhgrnxdqwwous3otqwk0tsjppcfmci+bcgy96jpftcr7bubxhmu14bdopcwuann2d3uuwepvp+</inverseq > <d>mk3trtmwrjb33ognn9oefumyfy92qxi3x6hq1o6qdbw2qkd4bimfv+ni6ainyovuaadt2y+ Lq4dkgccvjzozvpm1vkxd2y7xka8/vebprirtt0qnpq9t7ujkpdsixf/zomfwdjc3ua1bpnq65rwhsj7zae+gd7xnyce5meyIjle=</d></rsakeyvalue> 

Public:

<RSAKeyValue>  <modulus>pjljir0+g/vs7mhycs0zd5dbwokmcslx7ih373+ljltermtm8ihj0sl8za26qu/ oamqh9ofk806zw3txl90rghseqhzzbxfhbrtfn4u/o3wphzbdfazh80bbskrmq/jmz70qum3hmgzsb3toxzn6ehakdo7qp2kc6aovtyxrypk= </Modulus>  <Exponent>AQAB</Exponent></RSAKeyValue>

　　

Transform implementation Code (C #)

Format conversion to use an open source encryption library bouncy Castle Crypto APIs, website address: http://www.bouncycastle.org/csharp/

The specific implementation code is as follows:

Using system;using system.xml;using org.bouncycastle.asn1.pkcs;using org.bouncycastle.asn1.x509;using Org.bouncycastle.crypto.parameters;using org.bouncycastle.math;using org.bouncycastle.pkcs;using Org.bouncycastle.security;using org.bouncycastle.x509;///<summary>///RSA key format conversion///</summary>public Class rsakeyconvert{//<summary>//RSA private key format conversion, java->.net///</summary>//<param name= " Privatekey ">java generated RSA private key </param>///<returns></returns> public static string Rsaprivatekeyjava 2DotNet (String privatekey) {rsaprivatecrtkeyparameters Privatekeyparam = (rsaprivatecrtkeyparameters) PrivateKey        Factory.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&Gt;</rsakeyvalue> ", Convert.tobase64string (privateKeyParam.Modulus.ToByteArrayUnsigned ()), Con Vert. ToBase64String (privateKeyParam.PublicExponent.ToByteArrayUnsigned ()), Convert.tobase64string (PRIVATEKEYPARAM.P. Tobytearrayunsigned ()), convert.tobase64string (privatekeyparam.q.tobytearrayunsigned ()), Convert.ToB Ase64string (privateKeyParam.DP.ToByteArrayUnsigned ()), convert.tobase64string (PrivateKeyParam.DQ.ToByteArrayUns Igned ()), convert.tobase64string (privateKeyParam.QInv.ToByteArrayUnsigned ()), convert.tobase64string    (privateKeyParam.Exponent.ToByteArrayUnsigned ())); }///<summary>//RSA private key format conversion,. Net->java///</summary>/<param name= "Privatekey" >.net Generated private key </param>///<returns></returns> public static string Rsaprivatekeydotnet2java (String private        Key) {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 public key format conversion, java->.net///</summary>/<param name= "PublicKey" >java Health </param>///<returns></returns> public static string Rsapublickeyjava2dotnet (String PublicKey ) {Rsakeyparameters Publickeyparam = (rsakeyparameters) publickeyfactory.createkey (convert.frombase64string (publ        Ickey)); return string. Format ("<rsakeyvalue><modulus>{0}</modulus><exponent>{1}</exponent></ Rsakeyvalue> ", Convert.tobase64string (publicKeyParam.Modulus.ToByteArrayUnsigned ()), convert.tobase64string (publicKeyParam.Exponent.ToByteArrayUnsigned ())); }///<summary>//RSA public key format conversion,. Net->java///</summary>/<param name= "PublicKey" >.net </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); }} 

　　

RSA key C # format and Java Format conversion