cmx-tool/sm2.js

function SM2Cipher(cipherMode){this.ct=1;this.p2=null;this.sm3keybase=null;this.sm3c3=null;this.key=new Array(32);this.keyOff=0;if(typeof(cipherMode)!='undefined'){this.cipherMode=cipherMode}else{this.cipherMode=SM2CipherMode.C1C3C2}}SM2Cipher.prototype={Reset:function(){this.sm3keybase=new SM3Digest();this.sm3c3=new SM3Digest();var xWords=this.GetWords(this.p2.getX().toBigInteger().toRadix(16));var yWords=this.GetWords(this.p2.getY().toBigInteger().toRadix(16));this.sm3keybase.BlockUpdate(xWords,0,xWords.length);this.sm3c3.BlockUpdate(xWords,0,xWords.length);this.sm3keybase.BlockUpdate(yWords,0,yWords.length);this.ct=1;this.NextKey()},NextKey:function(){var sm3keycur=new SM3Digest(this.sm3keybase);sm3keycur.Update((this.ct>>24&0x00ff));sm3keycur.Update((this.ct>>16&0x00ff));sm3keycur.Update((this.ct>>8&0x00ff));sm3keycur.Update((this.ct&0x00ff));sm3keycur.DoFinal(this.key,0);this.keyOff=0;this.ct++},InitEncipher:function(userKey){var k=null;var c1=null;var ec=new KJUR.crypto.ECDSA({"curve":"sm2"});var keypair=ec.generateKeyPairHex();k=new BigInteger(keypair.ecprvhex,16);var pubkeyHex=keypair.ecpubhex;c1=ECPointFp.decodeFromHex(ec.ecparams['curve'],pubkeyHex);this.p2=userKey.multiply(k);this.Reset();return c1},EncryptBlock:function(data){this.sm3c3.BlockUpdate(data,0,data.length);for(var i=0;i<data.length;i++){if(this.keyOff==this.key.length){this.NextKey()}data[i]^=this.key[this.keyOff++]}},InitDecipher:function(userD,c1){this.p2=c1.multiply(userD);this.Reset()},DecryptBlock:function(data){for(var i=0;i<data.length;i++){if(this.keyOff==this.key.length){this.NextKey()}data[i]^=this.key[this.keyOff++]}this.sm3c3.BlockUpdate(data,0,data.length)},Dofinal:function(c3){var yWords=this.GetWords(this.p2.getY().toBigInteger().toRadix(16));this.sm3c3.BlockUpdate(yWords,0,yWords.length);this.sm3c3.DoFinal(c3,0);this.Reset()},Encrypt:function(pubKey,plaintext){var data=new Array(plaintext.length);Array.Copy(plaintext,0,data,0,plaintext.length);var c1=this.InitEncipher(pubKey);this.EncryptBlock(data);var c3=new Array(32);this.Dofinal(c3);var hexString=c1.getX().toBigInteger().toRadix(16)+c1.getY().toBigInteger().toRadix(16)+this.GetHex(data).toString()+this.GetHex(c3).toString();if(this.cipherMode==SM2CipherMode.C1C3C2){hexString=c1.getX().toBigInteger().toRadix(16)+c1.getY().toBigInteger().toRadix(16)+this.GetHex(c3).toString()+this.GetHex(data).toString()}return hexString},GetWords:function(hexStr){var words=[];var hexStrLength=hexStr.length;for(var i=0;i<hexStrLength;i+=2){words[words.length]=parseInt(hexStr.substr(i,2),16)}return words},GetHex:function(arr){var words=[];var j=0;for(var i=0;i<arr.length*2;i+=2){words[i>>>3]|=parseInt(arr[j])<<(24-(i%8)*4);j++}var wordArray=new CryptoJS.lib.WordArray.init(words,arr.length);return wordArray},Decrypt:function(privateKey,ciphertext){var hexString=ciphertext;var c1X=hexString.substr(0,64);var c1Y=hexString.substr(0+c1X.length,64);var encrypData=hexString.substr(c1X.length+c1Y.length,hexString.length-c1X.length-c1Y.length-64);var c3=hexString.substr(hexString.length-64);if(this.cipherMode==SM2CipherMode.C1C3C2){c3=hexString.substr(c1X.length+c1Y.length,64);encrypData=hexString.substr(c1X.length+c1Y.length+64)}var data=this.GetWords(encrypData);var c1=this.CreatePoint(c1X,c1Y);this.InitDecipher(privateKey,c1);this.DecryptBlock(data);var c3_=new Array(32);this.Dofinal(c3_);var isDecrypt=this.GetHex(c3_).toString()==c3;if(isDecrypt){var wordArray=this.GetHex(data);var decryptData=CryptoJS.enc.Utf8.stringify(wordArray);return decryptData}else{return''}},CreatePoint:function(x,y){var ec=new KJUR.crypto.ECDSA({"curve":"sm2"});var ecc_curve=ec.ecparams['curve'];var pubkeyHex='04'+x+y;var point=ECPointFp.decodeFromHex(ec.ecparams['curve'],pubkeyHex);return point}};SM2CipherMode={C1C2C3:'0',C1C3C2:'1'};module.exports = SM2Cipher;