rsa加密算法使用示例分享

产生私钥和公钥
system.security.cryptography.rsacryptoserviceprovider myrsa = new rsacryptoserviceprovider();
//得到私钥主要保存了rsaparameters中的8各参数
privatekey = myrsa.toxmlstring(true);
//得到公钥保存了rsaparameters中2个参数
publickey = myrsa.toxmlstring(false);

ras实现加密
system.security.cryptography.rsacryptoserviceprovider myrsa = new rsacryptoserviceprovider();
//得到公钥
myrsa.fromxmlstring(publickey);
//把你要加密的内容转换成byte[]
byte[] plaintextbarray = (new unicodeencoding()).getbytes("这里是你要加密的内容");
//使用.net中的encrypt方法加密
byte[] cyphertextbarray = myrsa.encrypt(plaintextbarray, false);
//最后吧加密后的byte[]转换成base64string，这里就是加密后的内容了
result = convert.tobase64string(cyphertextbarray)

ras实现解密
system.security.cryptography.rsacryptoserviceprovider myrsa = new rsacryptoserviceprovider();
//得到私钥
myrsa.fromxmlstring(xmlprivatekey);
//把原来加密后的string转换成byte[]
byte[] plaintextbarray = convert.frombase64string("刚才加密后的string");
//使用.net中的decrypt方法解密
byte[] dyphertextbarray = myrsa.decrypt(plaintextbarray, false);
//转换解密后的byte[]，这就得到了我们原来的加密前的内容了
result = (new unicodeencoding()).getstring(dyphertextbarray);

byte[] messagebytes = encoding.utf8.getbytes("luo罗");
            rsacryptoserviceprovider orsa = new rsacryptoserviceprovider();
            string privatekey = orsa.toxmlstring(true);
            string publickey = orsa.toxmlstring(false);

            //私钥签名 
            rsacryptoserviceprovider orsa3 = new rsacryptoserviceprovider();
            orsa3.fromxmlstring(privatekey);
            byte[] aoutput = orsa3.signdata(messagebytes, "sha1");
            //公钥验证 
            rsacryptoserviceprovider orsa4 = new rsacryptoserviceprovider();
            orsa4.fromxmlstring(publickey);
            bool bverify = orsa4.verifydata(messagebytes, "sha1", aoutput);